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## transforms

transforms — XMLDsig and XMLEnc transforms.

## Stability Level

Stable, unless otherwise indicated

## Functions

xmlSecPtrListPtr | xmlSecTransformIdsGet ()
int | xmlSecTransformIdsInit ()
void | xmlSecTransformIdsShutdown ()
int | xmlSecTransformIdsRegisterDefault ()
int | xmlSecTransformIdsRegister ()
int | xmlSecTransformUriTypeCheck ()
int | (*xmlSecTransformCtxPreExecuteCallback) ()
xmlSecTransformCtxPtr | xmlSecTransformCtxCreate ()
void | xmlSecTransformCtxDestroy ()
int | xmlSecTransformCtxInitialize ()
void | xmlSecTransformCtxFinalize ()
void | xmlSecTransformCtxReset ()
int | xmlSecTransformCtxCopyUserPref ()
int | xmlSecTransformCtxSetUri ()
int | xmlSecTransformCtxAppend ()
int | xmlSecTransformCtxPrepend ()
xmlSecTransformPtr | xmlSecTransformCtxCreateAndAppend ()
xmlSecTransformPtr | xmlSecTransformCtxCreateAndPrepend ()
xmlSecTransformPtr | xmlSecTransformCtxNodeRead ()
int | xmlSecTransformCtxNodesListRead ()
int | xmlSecTransformCtxPrepare ()
int | xmlSecTransformCtxBinaryExecute ()
int | xmlSecTransformCtxUriExecute ()
int | xmlSecTransformCtxXmlExecute ()
int | xmlSecTransformCtxExecute ()
void | xmlSecTransformCtxDebugDump ()
void | xmlSecTransformCtxDebugXmlDump ()
xmlSecSize | xmlSecTransformCtxGetDefaultBinaryChunkSize ()
void | xmlSecTransformCtxSetDefaultBinaryChunkSize ()
xmlSecTransformPtr | xmlSecTransformCreate ()
void | xmlSecTransformDestroy ()
xmlSecTransformPtr | xmlSecTransformNodeRead ()
int | xmlSecTransformPump ()
int | xmlSecTransformSetKey ()
int | xmlSecTransformSetKeyReq ()
int | xmlSecTransformVerify ()
int | xmlSecTransformVerifyNodeContent ()
xmlSecTransformDataType | xmlSecTransformGetDataType ()
int | xmlSecTransformPushBin ()
int | xmlSecTransformPopBin ()
int | xmlSecTransformPushXml ()
int | xmlSecTransformPopXml ()
int | xmlSecTransformExecute ()
void | xmlSecTransformDebugDump ()
void | xmlSecTransformDebugXmlDump ()
#define | xmlSecTransformGetName()
#define | xmlSecTransformIsValid()
#define | xmlSecTransformCheckId()
#define | xmlSecTransformCheckSize()
int | xmlSecTransformConnect ()
void | xmlSecTransformRemove ()
xmlSecTransformDataType | xmlSecTransformDefaultGetDataType ()
int | xmlSecTransformDefaultPushBin ()
int | xmlSecTransformDefaultPopBin ()
int | xmlSecTransformDefaultPushXml ()
int | xmlSecTransformDefaultPopXml ()
xmlOutputBufferPtr | xmlSecTransformCreateOutputBuffer ()
xmlParserInputBufferPtr | xmlSecTransformCreateInputBuffer ()
int | (*xmlSecTransformInitializeMethod) ()
void | (*xmlSecTransformFinalizeMethod) ()
xmlSecTransformDataType | (*xmlSecTransformGetDataTypeMethod) ()
int | (*xmlSecTransformNodeReadMethod) ()
int | (*xmlSecTransformNodeWriteMethod) ()
int | (*xmlSecTransformSetKeyRequirementsMethod) ()
int | (*xmlSecTransformSetKeyMethod) ()
int | (*xmlSecTransformVerifyMethod) ()
int | (*xmlSecTransformPushBinMethod) ()
int | (*xmlSecTransformPopBinMethod) ()
int | (*xmlSecTransformPushXmlMethod) ()
int | (*xmlSecTransformPopXmlMethod) ()
int | (*xmlSecTransformExecuteMethod) ()
#define | xmlSecTransformKlassGetName()
xmlSecPtrListId | xmlSecTransformIdListGetKlass ()
int | xmlSecTransformIdListFind ()
xmlSecTransformId | xmlSecTransformIdListFindByHref ()
xmlSecTransformId | xmlSecTransformIdListFindByName ()
void | xmlSecTransformIdListDebugDump ()
void | xmlSecTransformIdListDebugXmlDump ()
xmlSecTransformId | xmlSecTransformBase64GetKlass ()
void | xmlSecTransformBase64SetLineSize ()
xmlSecTransformId | xmlSecTransformInclC14NGetKlass ()
xmlSecTransformId | xmlSecTransformInclC14NWithCommentsGetKlass ()
xmlSecTransformId | xmlSecTransformInclC14N11GetKlass ()
xmlSecTransformId | xmlSecTransformInclC14N11WithCommentsGetKlass ()
xmlSecTransformId | xmlSecTransformExclC14NGetKlass ()
xmlSecTransformId | xmlSecTransformExclC14NWithCommentsGetKlass ()
xmlSecTransformId | xmlSecTransformEnvelopedGetKlass ()
xmlSecTransformId | xmlSecTransformXPathGetKlass ()
xmlSecTransformId | xmlSecTransformXPath2GetKlass ()
xmlSecTransformId | xmlSecTransformXPointerGetKlass ()
int | xmlSecTransformXPointerSetExpr ()
xmlSecTransformId | xmlSecTransformRelationshipGetKlass ()
xmlSecTransformId | xmlSecTransformXsltGetKlass ()
void | xmlSecTransformXsltSetDefaultSecurityPrefs ()
xmlSecTransformId | xmlSecTransformRemoveXmlTagsC14NGetKlass ()
xmlSecTransformId | xmlSecTransformVisa3DHackGetKlass ()
int | xmlSecTransformVisa3DHackSetID ()
xmlSecSize | xmlSecTransformHmacGetMinOutputBitsSize ()
void | xmlSecTransformHmacSetMinOutputBitsSize ()

## Types and Values

enum | xmlSecTransformStatus
enum | xmlSecTransformMode
enum | xmlSecTransformOperation
typedef | xmlSecTransformUriType
#define | xmlSecTransformUriTypeNone
#define | xmlSecTransformUriTypeEmpty
#define | xmlSecTransformUriTypeSameDocument
#define | xmlSecTransformUriTypeLocal
#define | xmlSecTransformUriTypeRemote
#define | xmlSecTransformUriTypeAny
typedef | xmlSecTransformDataType
#define | xmlSecTransformDataTypeUnknown
#define | xmlSecTransformDataTypeBin
#define | xmlSecTransformDataTypeXml
typedef | xmlSecTransformUsage
#define | xmlSecTransformUsageUnknown
#define | xmlSecTransformUsageDSigTransform
#define | xmlSecTransformUsageC14NMethod
#define | xmlSecTransformUsageDigestMethod
#define | xmlSecTransformUsageSignatureMethod
#define | xmlSecTransformUsageEncryptionMethod
#define | xmlSecTransformUsageKeyDerivationMethod
#define | xmlSecTransformUsageAgreementMethod
#define | xmlSecTransformUsageAny
#define | XMLSEC_TRANSFORMCTX_FLAGS_USE_VISA3D_HACK
#define | XMLSEC_TRANSFORMCTX_FLAGS_SUPPORT_ASN1_SIGNATURE_VALUES
struct | xmlSecTransformCtx
#define | XMLSEC_TRANSFORM_FLAGS_USER_SPECIFIED
struct | xmlSecTransform
struct | xmlSecTransformKlass
#define | xmlSecTransformIdListId
#define | xmlSecTransformIdUnknown
#define | xmlSecTransformBase64Id
#define | xmlSecTransformInclC14NId
#define | xmlSecTransformInclC14NWithCommentsId
#define | xmlSecTransformInclC14N11Id
#define | xmlSecTransformInclC14N11WithCommentsId
#define | xmlSecTransformExclC14NId
#define | xmlSecTransformExclC14NWithCommentsId
#define | xmlSecTransformEnvelopedId
#define | xmlSecTransformXPathId
#define | xmlSecTransformXPath2Id
#define | xmlSecTransformXPointerId
#define | xmlSecTransformRelationshipId
#define | xmlSecTransformXsltId
#define | xmlSecTransformRemoveXmlTagsC14NId
#define | xmlSecTransformVisa3DHackId

## Description

## Functions

### xmlSecTransformIdsGet ()

    xmlSecPtrListPtr
    xmlSecTransformIdsGet (void);

Gets global registered transform klasses list.

#### Returns

the pointer to list of all registered transform klasses.

### xmlSecTransformIdsInit ()

    int
    xmlSecTransformIdsInit (void);

Initializes the transform klasses. This function is called from the xmlSecInit function and the application should not call it directly.

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformIdsShutdown ()

    void
    xmlSecTransformIdsShutdown (void);

Shuts down the keys data klasses. This function is called from the xmlSecShutdown function and the application should not call it directly.

### xmlSecTransformIdsRegisterDefault ()

    int
    xmlSecTransformIdsRegisterDefault (void);

Registers default (implemented by XML Security Library) transform klasses: XPath transform, Base64 transform, ...

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformIdsRegister ()

    int
    xmlSecTransformIdsRegister (xmlSecTransformId id);

Registers `id` in the global list of transform klasses.

#### Parameters

id | the transform klass. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformUriTypeCheck ()

    int
    xmlSecTransformUriTypeCheck (xmlSecTransformUriType type,
                                 const xmlChar *uri);

Checks if `uri` matches expected type `type` .

#### Parameters

type | the expected URI type. |
uri | the uri for checking. |

#### Returns

1 if `uri` matches `type` , 0 if not or a negative value if an error occurs.

### xmlSecTransformCtxPreExecuteCallback ()

    int
    (*xmlSecTransformCtxPreExecuteCallback)
                                   (xmlSecTransformCtxPtr transformCtx);

The callback called after creating transforms chain but before starting data processing. Application can use this callback to do additional transforms chain verification or modification and aborting transforms execution (if necessary).

#### Parameters

transformCtx | the pointer to transform's context. |

#### Returns

0 on success and a negative value otherwise (in this case, transforms chain will not be executed and xmlsec processing stops).

### xmlSecTransformCtxCreate ()

    xmlSecTransformCtxPtr
    xmlSecTransformCtxCreate (void);

Creates transforms chain processing context. The caller is responsible for destroying returned object by calling xmlSecTransformCtxDestroy function.

#### Returns

pointer to newly allocated context object or NULL if an error occurs.

### xmlSecTransformCtxDestroy ()

    void
    xmlSecTransformCtxDestroy (xmlSecTransformCtxPtr ctx);

Destroy context object created with xmlSecTransformCtxCreate function.

#### Parameters

ctx | the pointer to transforms chain processing context. |

### xmlSecTransformCtxInitialize ()

    int
    xmlSecTransformCtxInitialize (xmlSecTransformCtxPtr ctx);

Initializes transforms chain processing context. The caller is responsible for cleaning up returned object by calling xmlSecTransformCtxFinalize function.

#### Parameters

ctx | the pointer to transforms chain processing context. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformCtxFinalize ()

    void
    xmlSecTransformCtxFinalize (xmlSecTransformCtxPtr ctx);

Cleans up `ctx` object initialized with xmlSecTransformCtxInitialize function.

#### Parameters

ctx | the pointer to transforms chain processing context. |

### xmlSecTransformCtxReset ()

    void
    xmlSecTransformCtxReset (xmlSecTransformCtxPtr ctx);

Resets transforms context for new processing.

#### Parameters

ctx | the pointer to transforms chain processing context. |

### xmlSecTransformCtxCopyUserPref ()

    int
    xmlSecTransformCtxCopyUserPref (xmlSecTransformCtxPtr dst,
                                    xmlSecTransformCtxPtr src);

Copies user settings from `src` context to `dst` .

#### Parameters

dst | the pointer to destination transforms chain processing context. |
src | the pointer to source transforms chain processing context. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxSetUri ()

    int
    xmlSecTransformCtxSetUri (xmlSecTransformCtxPtr ctx,
                              const xmlChar *uri,
                              xmlNodePtr hereNode);

Parses uri and adds xpointer transforms if required.

The following examples demonstrate what the URI attribute identifies and how it is dereferenced (http://www.w3.org/TR/xmldsig-core/sec-ReferenceProcessingModel):

- URI="http://example.com/bar.xml" identifies the octets that represent the external resource 'http://example.com/bar.xml', that is probably an XML document given its file extension.

- URI="http://example.com/bar.xmlchapter1" identifies the element with ID attribute value 'chapter1' of the external XML resource 'http://example.com/bar.xml', provided as an octet stream. Again, for the sake of interoperability, the element identified as 'chapter1' should be obtained using an XPath transform rather than a URI fragment (barename XPointer resolution in external resources is not REQUIRED in this specification).

- URI="" identifies the node-set (minus any comment nodes) of the XML resource containing the signature

- URI="chapter1" identifies a node-set containing the element with ID attribute value 'chapter1' of the XML resource containing the signature. XML Signature (and its applications) modify this node-set to include the element plus all descendants including namespaces and attributes -- but not comments.

#### Parameters

ctx | the pointer to transforms chain processing context. |
uri | the URI. |
hereNode | the pointer to "here" node required by some XML transforms (may be NULL). |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxAppend ()

    int
    xmlSecTransformCtxAppend (xmlSecTransformCtxPtr ctx,
                              xmlSecTransformPtr transform);

Connects the `transform` to the end of the chain of transforms in the `ctx` (see xmlSecTransformConnect function for details).

#### Parameters

ctx | the pointer to transforms chain processing context. |
transform | the pointer to new transform. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxPrepend ()

    int
    xmlSecTransformCtxPrepend (xmlSecTransformCtxPtr ctx,
                               xmlSecTransformPtr transform);

Connects the `transform` to the beggining of the chain of transforms in the `ctx` (see xmlSecTransformConnect function for details).

#### Parameters

ctx | the pointer to transforms chain processing context. |
transform | the pointer to new transform. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxCreateAndAppend ()

    xmlSecTransformPtr
    xmlSecTransformCtxCreateAndAppend (xmlSecTransformCtxPtr ctx,
                                       xmlSecTransformId id);

Creates new transform and connects it to the end of the chain of transforms in the `ctx` (see xmlSecTransformConnect function for details).

#### Parameters

ctx | the pointer to transforms chain processing context. |
id | the new transform klass. |

#### Returns

pointer to newly created transform or NULL if an error occurs.

### xmlSecTransformCtxCreateAndPrepend ()

    xmlSecTransformPtr
    xmlSecTransformCtxCreateAndPrepend (xmlSecTransformCtxPtr ctx,
                                        xmlSecTransformId id);

Creates new transform and connects it to the end of the chain of transforms in the `ctx` (see xmlSecTransformConnect function for details).

#### Parameters

ctx | the pointer to transforms chain processing context. |
id | the new transform klass. |

#### Returns

pointer to newly created transform or NULL if an error occurs.

### xmlSecTransformCtxNodeRead ()

    xmlSecTransformPtr
    xmlSecTransformCtxNodeRead (xmlSecTransformCtxPtr ctx,
                                xmlNodePtr node,
                                xmlSecTransformUsage usage);

Reads the transform from the `node` and appends it to the current chain of transforms in `ctx` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
node | the pointer to transform's node. |
usage | the transform's usage (signature, encryption, etc.). |

#### Returns

pointer to newly created transform or NULL if an error occurs.

### xmlSecTransformCtxNodesListRead ()

    int
    xmlSecTransformCtxNodesListRead (xmlSecTransformCtxPtr ctx,
                                     xmlNodePtr node,
                                     xmlSecTransformUsage usage);

Reads transforms from the <dsig:Transform/> children of the `node` and appends them to the current transforms chain in `ctx` object.

#### Parameters

ctx | the pointer to transforms chain processing context. |
node | the pointer to <dsig:Transform/> nodes parent node. |
usage | the transform's usage (signature, encryption, etc.). |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxPrepare ()

    int
    xmlSecTransformCtxPrepare (xmlSecTransformCtxPtr ctx,
                               xmlSecTransformDataType inputDataType);

Prepares the transform context for processing data of `inputDataType` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
inputDataType | the expected input type. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxBinaryExecute ()

    int
    xmlSecTransformCtxBinaryExecute (xmlSecTransformCtxPtr ctx,
                                     const xmlSecByte *data,
                                     xmlSecSize dataSize);

Processes binary data using transforms chain in the `ctx` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
data | the input binary data buffer. |
dataSize | the input data size. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxUriExecute ()

    int
    xmlSecTransformCtxUriExecute (xmlSecTransformCtxPtr ctx,
                                  const xmlChar *uri);

Process binary data from the URI using transforms chain in `ctx` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
uri | the URI. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxXmlExecute ()

    int
    xmlSecTransformCtxXmlExecute (xmlSecTransformCtxPtr ctx,
                                  xmlSecNodeSetPtr nodes);

Process `nodes` using transforms in the transforms chain in `ctx` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
nodes | the input node set. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxExecute ()

    int
    xmlSecTransformCtxExecute (xmlSecTransformCtxPtr ctx,
                               xmlDocPtr doc);

Executes transforms chain in `ctx` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
doc | the pointer to input document. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformCtxDebugDump ()

    void
    xmlSecTransformCtxDebugDump (xmlSecTransformCtxPtr ctx,
                                 FILE *output);

Prints transforms context debug information to `output` .

#### Parameters

ctx | the pointer to transforms chain processing context. |
output | the pointer to output FILE. |

### xmlSecTransformCtxDebugXmlDump ()

    void
    xmlSecTransformCtxDebugXmlDump (xmlSecTransformCtxPtr ctx,
                                    FILE *output);

Prints transforms context debug information to `output` in XML format.

#### Parameters

ctx | the pointer to transforms chain processing context. |
output | the pointer to output FILE. |

### xmlSecTransformCtxGetDefaultBinaryChunkSize ()

    xmlSecSize
    xmlSecTransformCtxGetDefaultBinaryChunkSize
                                   (void);

Gets the binary chunk size. Increasing the chunk size improves XMLSec library performance at the expense of increased memory usage.

#### Returns

the current binary processing chunk size.

### xmlSecTransformCtxSetDefaultBinaryChunkSize ()

    void
    xmlSecTransformCtxSetDefaultBinaryChunkSize
                                   (xmlSecSize binaryChunkSize);

Sets the default binary chunk size. Increasing the chunk size improves XMLSec library performance at the expense of increased memory usage. This function is not thread safe and should only be called during initialization.

#### Parameters

binaryChunkSize | the new binary chunk size (must be greater than zero). |

### xmlSecTransformCreate ()

    xmlSecTransformPtr
    xmlSecTransformCreate (xmlSecTransformId id);

Creates new transform of the `id` klass. The caller is responsible for destroying returned transform using xmlSecTransformDestroy function.

#### Parameters

id | the transform id to create. |

#### Returns

pointer to newly created transform or NULL if an error occurs.

### xmlSecTransformDestroy ()

    void
    xmlSecTransformDestroy (xmlSecTransformPtr transform);

Destroys transform created with xmlSecTransformCreate function.

#### Parameters

transform | the pointer to transform. |

### xmlSecTransformNodeRead ()

    xmlSecTransformPtr
    xmlSecTransformNodeRead (xmlNodePtr node,
                             xmlSecTransformUsage usage,
                             xmlSecTransformCtxPtr transformCtx);

Reads transform from the `node` as follows:

1) reads "Algorithm" attribute;

2) checks the lists of known and allowed transforms;

3) calls transform's create method;

4) calls transform's read transform node method.

#### Parameters

node | the pointer to the transform's node. |
usage | the transform usage (signature, encryption, ...). |
transformCtx | the transform's chain processing context. |

#### Returns

pointer to newly created transform or NULL if an error occurs.

### xmlSecTransformPump ()

    int
    xmlSecTransformPump (xmlSecTransformPtr left,
                         xmlSecTransformPtr right,
                         xmlSecTransformCtxPtr transformCtx);

Pops data from `left` transform and pushes to `right` transform until no more data is available.

#### Parameters

left | the source pumping transform. |
right | the destination pumping transform. |
transformCtx | the transform's chain processing context. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformSetKey ()

    int
    xmlSecTransformSetKey (xmlSecTransformPtr transform,
                           xmlSecKeyPtr key);

Sets the transform's key.

#### Parameters

transform | the pointer to transform. |
key | the pointer to key. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformSetKeyReq ()

    int
    xmlSecTransformSetKeyReq (xmlSecTransformPtr transform,
                              xmlSecKeyReqPtr keyReq);

Sets the key requirements for `transform` in the `keyReq` .

#### Parameters

transform | the pointer to transform. |
keyReq | the pointer to keys requirements object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformVerify ()

    int
    xmlSecTransformVerify (xmlSecTransformPtr transform,
                           const xmlSecByte *data,
                           xmlSecSize dataSize,
                           xmlSecTransformCtxPtr transformCtx);

Verifies the data with transform's processing results (for digest, HMAC and signature transforms). The verification result is stored in the status member of xmlSecTransform object.

#### Parameters

transform | the pointer to transform. |
data | the binary data for verification. |
dataSize | the data size. |
transformCtx | the transform's chain processing context. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformVerifyNodeContent ()

    int
    xmlSecTransformVerifyNodeContent (xmlSecTransformPtr transform,
                                      xmlNodePtr node,
                                      xmlSecTransformCtxPtr transformCtx);

Gets the `node` content, base64 decodes it and calls xmlSecTransformVerify function to verify binary results.

#### Parameters

transform | the pointer to transform. |
node | the pointer to node. |
transformCtx | the transform's chain processing context. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformGetDataType ()

    xmlSecTransformDataType
    xmlSecTransformGetDataType (xmlSecTransformPtr transform,
                                xmlSecTransformMode mode,
                                xmlSecTransformCtxPtr transformCtx);

Gets transform input (`mode` is "push") or output (`mode` is "pop") data type (binary or XML).

#### Parameters

transform | the pointer to transform. |
mode | the data mode (push or pop). |
transformCtx | the transform's chain processing context. |

#### Returns

the transform's data type for the `mode` operation.

### xmlSecTransformPushBin ()

    int
    xmlSecTransformPushBin (xmlSecTransformPtr transform,
                            const xmlSecByte *data,
                            xmlSecSize dataSize,
                            int final,
                            xmlSecTransformCtxPtr transformCtx);

Process binary `data` and pushes results to next transform.

#### Parameters

transform | the pointer to transform object. |
data | the input binary data, |
dataSize | the input data size. |
final | the flag: if set to 1 then it's the last data chunk. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformPopBin ()

    int
    xmlSecTransformPopBin (xmlSecTransformPtr transform,
                           xmlSecByte *data,
                           xmlSecSize maxDataSize,
                           xmlSecSize *dataSize,
                           xmlSecTransformCtxPtr transformCtx);

Pops data from previous transform in the chain, processes data and returns result in the `data` buffer. The size of returned data is placed in the `dataSize` .

#### Parameters

transform | the pointer to transform object. |
data | the buffer to store result data. |
maxDataSize | the size of the buffer data. |
dataSize | the pointer to returned data size. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformPushXml ()

    int
    xmlSecTransformPushXml (xmlSecTransformPtr transform,
                            xmlSecNodeSetPtr nodes,
                            xmlSecTransformCtxPtr transformCtx);

Processes `nodes` and pushes result to the next transform in the chain.

#### Parameters

transform | the pointer to transform object. |
nodes | the input nodes. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformPopXml ()

    int
    xmlSecTransformPopXml (xmlSecTransformPtr transform,
                           xmlSecNodeSetPtr *nodes,
                           xmlSecTransformCtxPtr transformCtx);

Pops data from previous transform in the chain, processes the data and returns result in `nodes` .

#### Parameters

transform | the pointer to transform object. |
nodes | the pointer to store popinter to result nodes. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformExecute ()

    int
    xmlSecTransformExecute (xmlSecTransformPtr transform,
                            int last,
                            xmlSecTransformCtxPtr transformCtx);

Executes transform (used by default popBin/pushBin/popXml/pushXml methods).

#### Parameters

transform | the pointer to transform. |
last | the flag: if set to 1 then it's the last data chunk. |
transformCtx | the transform's chain processing context. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformDebugDump ()

    void
    xmlSecTransformDebugDump (xmlSecTransformPtr transform,
                              FILE *output);

Prints transform's debug information to `output` .

#### Parameters

transform | the pointer to transform. |
output | the pointer to output FILE. |

### xmlSecTransformDebugXmlDump ()

    void
    xmlSecTransformDebugXmlDump (xmlSecTransformPtr transform,
                                 FILE *output);

Prints transform's debug information to `output` in XML format.

#### Parameters

transform | the pointer to transform. |
output | the pointer to output FILE. |

### xmlSecTransformGetName()

    #define             xmlSecTransformGetName(transform)

Macro. Returns transform name.

#### Parameters

transform | the pointer to transform. |

### xmlSecTransformIsValid()

    #define             xmlSecTransformIsValid(transform)

Macro. Returns 1 if the `transform` is valid or 0 otherwise.

#### Parameters

transform | the pointer to transform. |

### xmlSecTransformCheckId()

    #define             xmlSecTransformCheckId(transform, i)

Macro. Returns 1 if the `transform` is valid and has specified id `i` or 0 otherwise.

#### Parameters

transform | the pointer to transform. |
i | the transform id. |

### xmlSecTransformCheckSize()

    #define             xmlSecTransformCheckSize(transform, size)

Macro. Returns 1 if the `transform` is valid and has at least `size` bytes or 0 otherwise.

#### Parameters

transform | the pointer to transform. |
size | the transform object size. |

### xmlSecTransformConnect ()

    int
    xmlSecTransformConnect (xmlSecTransformPtr left,
                            xmlSecTransformPtr right,
                            xmlSecTransformCtxPtr transformCtx);

If the data object is a node-set and the next transform requires octets, the signature application MUST attempt to convert the node-set to an octet stream using Canonical XML [XML-C14N].

The story is different if the right transform is base64 decode (http://www.w3.org/TR/xmldsig-core/sec-Base-64):

This transform requires an octet stream for input. If an XPath node-set (or sufficiently functional alternative) is given as input, then it is converted to an octet stream by performing operations logically equivalent to 1) applying an XPath transform with expression self::`text()`, then 2) taking the string-value of the node-set. Thus, if an XML element is identified by a barename XPointer in the Reference URI, and its content consists solely of base64 encoded character data, then this transform automatically strips away the start and end tags of the identified element and any of its descendant elements as well as any descendant comments and processing instructions. The output of this transform is an octet stream.

#### Parameters

left | the pointer to left (prev) transform. |
right | the pointer to right (next) transform. |
transformCtx | the transform's chain processing context. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformRemove ()

    void
    xmlSecTransformRemove (xmlSecTransformPtr transform);

Removes `transform` from the chain.

#### Parameters

transform | the pointer to xmlSecTransform structure. |

### xmlSecTransformDefaultGetDataType ()

    xmlSecTransformDataType
    xmlSecTransformDefaultGetDataType (xmlSecTransformPtr transform,
                                       xmlSecTransformMode mode,
                                       xmlSecTransformCtxPtr transformCtx);

Gets transform input (`mode` is "push") or output (`mode` is "pop") data type (binary or XML) by analyzing available pushBin/popBin/pushXml/popXml methods.

#### Parameters

transform | the pointer to transform. |
mode | the data mode (push or pop). |
transformCtx | the transform's chain processing context. |

#### Returns

the transform's data type for the `mode` operation.

### xmlSecTransformDefaultPushBin ()

    int
    xmlSecTransformDefaultPushBin (xmlSecTransformPtr transform,
                                   const xmlSecByte *data,
                                   xmlSecSize dataSize,
                                   int final,
                                   xmlSecTransformCtxPtr transformCtx);

Process binary `data` by calling transform's execute method and pushes results to next transform.

#### Parameters

transform | the pointer to transform object. |
data | the input binary data, |
dataSize | the input data size. |
final | the flag: if set to 1 then it's the last data chunk. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformDefaultPopBin ()

    int
    xmlSecTransformDefaultPopBin (xmlSecTransformPtr transform,
                                  xmlSecByte *data,
                                  xmlSecSize maxDataSize,
                                  xmlSecSize *dataSize,
                                  xmlSecTransformCtxPtr transformCtx);

Pops data from previous transform in the chain, processes data by calling transform's execute method and returns result in the `data` buffer. The size of returned data is placed in the `dataSize` .

#### Parameters

transform | the pointer to transform object. |
data | the buffer to store result data. |
maxDataSize | the size of the buffer data. |
dataSize | the pointer to returned data size. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformDefaultPushXml ()

    int
    xmlSecTransformDefaultPushXml (xmlSecTransformPtr transform,
                                   xmlSecNodeSetPtr nodes,
                                   xmlSecTransformCtxPtr transformCtx);

Processes `nodes` by calling transform's execute method and pushes result to the next transform in the chain.

#### Parameters

transform | the pointer to transform object. |
nodes | the input nodes. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformDefaultPopXml ()

    int
    xmlSecTransformDefaultPopXml (xmlSecTransformPtr transform,
                                  xmlSecNodeSetPtr *nodes,
                                  xmlSecTransformCtxPtr transformCtx);

Pops data from previous transform in the chain, processes the data by calling transform's execute method and returns result in `nodes` .

#### Parameters

transform | the pointer to transform object. |
nodes | the pointer to store popinter to result nodes. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformCreateOutputBuffer ()

    xmlOutputBufferPtr
    xmlSecTransformCreateOutputBuffer (xmlSecTransformPtr transform,
                                       xmlSecTransformCtxPtr transformCtx);

Creates output buffer to write data to `transform` .

#### Parameters

transform | the pointer to transform. |
transformCtx | the pointer to transform context object. |

#### Returns

pointer to new output buffer or NULL if an error occurs.

### xmlSecTransformCreateInputBuffer ()

    xmlParserInputBufferPtr
    xmlSecTransformCreateInputBuffer (xmlSecTransformPtr transform,
                                      xmlSecTransformCtxPtr transformCtx);

Creates input buffer to read data from `transform` .

#### Parameters

transform | the pointer to transform. |
transformCtx | the pointer to transform context object. |

#### Returns

pointer to new input buffer or NULL if an error occurs.

### xmlSecTransformInitializeMethod ()

    int
    (*xmlSecTransformInitializeMethod) (xmlSecTransformPtr transform);

The transform specific initialization method.

#### Parameters

transform | the pointer to transform object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformFinalizeMethod ()

    void
    (*xmlSecTransformFinalizeMethod) (xmlSecTransformPtr transform);

The transform specific destroy method.

#### Parameters

transform | the pointer to transform object. |

### xmlSecTransformGetDataTypeMethod ()

    xmlSecTransformDataType
    (*xmlSecTransformGetDataTypeMethod) (xmlSecTransformPtr transform,
                                         xmlSecTransformMode mode,
                                         xmlSecTransformCtxPtr transformCtx);

The transform specific method to query information about transform data type in specified mode `mode` .

#### Parameters

transform | the pointer to transform object. |
mode | the mode. |
transformCtx | the pointer to transform context object. |

#### Returns

transform data type.

### xmlSecTransformNodeReadMethod ()

    int
    (*xmlSecTransformNodeReadMethod) (xmlSecTransformPtr transform,
                                      xmlNodePtr node,
                                      xmlSecTransformCtxPtr transformCtx);

The transform specific method to read the transform data from the `node` .

#### Parameters

transform | the pointer to transform object. |
node | the pointer to <dsig:Transform/> node. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformNodeWriteMethod ()

    int
    (*xmlSecTransformNodeWriteMethod) (xmlSecTransformPtr transform,
                                       xmlNodePtr node,
                                       xmlSecTransformCtxPtr transformCtx);

The transform specific method to write transform information to an XML node `node` .

#### Parameters

transform | the pointer to transform object. |
node | the pointer to <dsig:Transform/> node. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformSetKeyRequirementsMethod ()

    int
    (*xmlSecTransformSetKeyRequirementsMethod)
                                   (xmlSecTransformPtr transform,
                                    xmlSecKeyReqPtr keyReq);

Transform specific method to set transform's key requirements.

#### Parameters

transform | the pointer to transform object. |
keyReq | the pointer to key requirements structure. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformSetKeyMethod ()

    int
    (*xmlSecTransformSetKeyMethod) (xmlSecTransformPtr transform,
                                    xmlSecKeyPtr key);

The transform specific method to set the key for use.

#### Parameters

transform | the pointer to transform object. |
key | the pointer to key. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformVerifyMethod ()

    int
    (*xmlSecTransformVerifyMethod) (xmlSecTransformPtr transform,
                                    const xmlSecByte *data,
                                    xmlSecSize dataSize,
                                    xmlSecTransformCtxPtr transformCtx);

The transform specific method to verify transform processing results (used by digest and signature transforms). This method sets `status` member of the xmlSecTransform structure to either xmlSecTransformStatusOk if verification succeeded or xmlSecTransformStatusFail otherwise.

#### Parameters

transform | the pointer to transform object. |
data | the input buffer. |
dataSize | the size of input buffer `data` . |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformPushBinMethod ()

    int
    (*xmlSecTransformPushBinMethod) (xmlSecTransformPtr transform,
                                     const xmlSecByte *data,
                                     xmlSecSize dataSize,
                                     int final,
                                     xmlSecTransformCtxPtr transformCtx);

The transform specific method to process data from `data` and push result to the next transform in the chain.

#### Parameters

transform | the pointer to transform object. |
data | the input binary data, |
dataSize | the input data size. |
final | the flag: if set to 1 then it's the last data chunk. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformPopBinMethod ()

    int
    (*xmlSecTransformPopBinMethod) (xmlSecTransformPtr transform,
                                    xmlSecByte *data,
                                    xmlSecSize maxDataSize,
                                    xmlSecSize *dataSize,
                                    xmlSecTransformCtxPtr transformCtx);

The transform specific method to pop data from previous transform in the chain and return result in the `data` buffer. The size of returned data is placed in the `dataSize` .

#### Parameters

transform | the pointer to transform object. |
data | the buffer to store result data. |
maxDataSize | the size of the buffer `data` . |
dataSize | the pointer to returned data size. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformPushXmlMethod ()

    int
    (*xmlSecTransformPushXmlMethod) (xmlSecTransformPtr transform,
                                     xmlSecNodeSetPtr nodes,
                                     xmlSecTransformCtxPtr transformCtx);

The transform specific method to process `nodes` and push result to the next transform in the chain.

#### Parameters

transform | the pointer to transform object. |
nodes | the input nodes. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformPopXmlMethod ()

    int
    (*xmlSecTransformPopXmlMethod) (xmlSecTransformPtr transform,
                                    xmlSecNodeSetPtr *nodes,
                                    xmlSecTransformCtxPtr transformCtx);

The transform specific method to pop data from previous transform in the chain, process the data and return result in `nodes` .

#### Parameters

transform | the pointer to transform object. |
nodes | the pointer to store popinter to result nodes. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformExecuteMethod ()

    int
    (*xmlSecTransformExecuteMethod) (xmlSecTransformPtr transform,
                                     int last,
                                     xmlSecTransformCtxPtr transformCtx);

Transform specific method to process a chunk of data.

#### Parameters

transform | the pointer to transform object. |
last | the flag: if set to 1 then it's the last data chunk. |
transformCtx | the pointer to transform context object. |

#### Returns

0 on success or a negative value otherwise.

### xmlSecTransformKlassGetName()

    #define             xmlSecTransformKlassGetName(klass)

Macro. Returns transform klass name.

#### Parameters

klass | the transform's klass. |

### xmlSecTransformIdListGetKlass ()

    xmlSecPtrListId
    xmlSecTransformIdListGetKlass (void);

The transform id list klass.

#### Returns

pointer to the transform id list klass.

### xmlSecTransformIdListFind ()

    int
    xmlSecTransformIdListFind (xmlSecPtrListPtr list,
                               xmlSecTransformId transformId);

Lookups `dataId` in `list` .

#### Parameters

list | the pointer to transform ids list. |
transformId | the transform klass. |

#### Returns

1 if `dataId` is found in the `list` , 0 if not and a negative value if an error occurs.

### xmlSecTransformIdListFindByHref ()

    xmlSecTransformId
    xmlSecTransformIdListFindByHref (xmlSecPtrListPtr list,
                                     const xmlChar *href,
                                     xmlSecTransformUsage usage);

Lookups data klass in the list with given `href` and `usage` in `list` .

#### Parameters

list | the pointer to transform ids list. |
href | the desired transform klass href. |
usage | the desired transform usage. |

#### Returns

transform klass is found and NULL otherwise.

### xmlSecTransformIdListFindByName ()

    xmlSecTransformId
    xmlSecTransformIdListFindByName (xmlSecPtrListPtr list,
                                     const xmlChar *name,
                                     xmlSecTransformUsage usage);

Lookups data klass in the list with given `name` and `usage` in `list` .

#### Parameters

list | the pointer to transform ids list. |
name | the desired transform klass name. |
usage | the desired transform usage. |

#### Returns

transform klass is found and NULL otherwise.

### xmlSecTransformIdListDebugDump ()

    void
    xmlSecTransformIdListDebugDump (xmlSecPtrListPtr list,
                                    FILE *output);

Prints binary transform debug information to `output` .

#### Parameters

list | the pointer to transform ids list. |
output | the pointer to output FILE. |

### xmlSecTransformIdListDebugXmlDump ()

    void
    xmlSecTransformIdListDebugXmlDump (xmlSecPtrListPtr list,
                                       FILE *output);

Prints binary transform debug information to `output` in XML format.

#### Parameters

list | the pointer to transform ids list. |
output | the pointer to output FILE. |

### xmlSecTransformBase64GetKlass ()

    xmlSecTransformId
    xmlSecTransformBase64GetKlass (void);

The Base64 transform klass (http://www.w3.org/TR/xmldsig-core/sec-Base-64). The normative specification for base64 decoding transforms is RFC 2045 (http://www.ietf.org/rfc/rfc2045.txt). The base64 Transform element has no content. The input is decoded by the algorithms. This transform is useful if an application needs to sign the raw data associated with the encoded content of an element.

#### Returns

base64 transform id.

### xmlSecTransformBase64SetLineSize ()

    void
    xmlSecTransformBase64SetLineSize (xmlSecTransformPtr transform,
                                      xmlSecSize lineSize);

Sets the max line size to `lineSize` .

#### Parameters

transform | the pointer to BASE64 encode transform. |
lineSize | the new max line size. |

### xmlSecTransformInclC14NGetKlass ()

    xmlSecTransformId
    xmlSecTransformInclC14NGetKlass (void);

Inclusive (regular) canonicalization that omits comments transform klass (http://www.w3.org/TR/xmldsig-core/sec-c14nAlg and http://www.w3.org/TR/2001/REC-xml-c14n-20010315).

#### Returns

c14n transform id.

### xmlSecTransformInclC14NWithCommentsGetKlass ()

    xmlSecTransformId
    xmlSecTransformInclC14NWithCommentsGetKlass
                                   (void);

Inclusive (regular) canonicalization that includes comments transform klass (http://www.w3.org/TR/xmldsig-core/sec-c14nAlg and http://www.w3.org/TR/2001/REC-xml-c14n-20010315).

#### Returns

c14n with comments transform id.

### xmlSecTransformInclC14N11GetKlass ()

    xmlSecTransformId
    xmlSecTransformInclC14N11GetKlass (void);

C14N version 1.1 (http://www.w3.org/TR/xml-c14n11)

#### Returns

c14n v1.1 transform id.

### xmlSecTransformInclC14N11WithCommentsGetKlass ()

    xmlSecTransformId
    xmlSecTransformInclC14N11WithCommentsGetKlass
                                   (void);

C14N version 1.1 (http://www.w3.org/TR/xml-c14n11) with comments

#### Returns

c14n v1.1 with comments transform id.

### xmlSecTransformExclC14NGetKlass ()

    xmlSecTransformId
    xmlSecTransformExclC14NGetKlass (void);

Exclusive canoncicalization that omits comments transform klass (http://www.w3.org/TR/xml-exc-c14n/).

#### Returns

exclusive c14n transform id.

### xmlSecTransformExclC14NWithCommentsGetKlass ()

    xmlSecTransformId
    xmlSecTransformExclC14NWithCommentsGetKlass
                                   (void);

Exclusive canoncicalization that includes comments transform klass (http://www.w3.org/TR/xml-exc-c14n/).

#### Returns

exclusive c14n with comments transform id.

### xmlSecTransformEnvelopedGetKlass ()

    xmlSecTransformId
    xmlSecTransformEnvelopedGetKlass (void);

The enveloped transform klass (http://www.w3.org/TR/xmldsig-core/sec-EnvelopedSignature):

An enveloped signature transform T removes the whole Signature element containing T from the digest calculation of the Reference element containing T. The entire string of characters used by an XML processor to match the Signature with the XML production element is removed. The output of the transform is equivalent to the output that would result from replacing T with an XPath transform containing the following XPath parameter element:

      <XPath xmlns:dsig="...">
        count(ancestor-or-self::dsig:Signature |
        here()/ancestor::dsig:Signature[1]) >
        count(ancestor-or-self::dsig:Signature)
      </XPath>

The input and output requirements of this transform are identical to those of the XPath transform, but may only be applied to a node-set from its parent XML document. Note that it is not necessary to use an XPath expression evaluator to create this transform. However, this transform MUST produce output in exactly the same manner as the XPath transform parameterized by the XPath expression above.

#### Returns

enveloped transform id.

### xmlSecTransformXPathGetKlass ()

    xmlSecTransformId
    xmlSecTransformXPathGetKlass (void);

The XPath transform evaluates given XPath expression and intersects the result with the previous nodes set. See http://www.w3.org/TR/xmldsig-core/sec-XPath for more details.

#### Returns

XPath transform id.

### xmlSecTransformXPath2GetKlass ()

    xmlSecTransformId
    xmlSecTransformXPath2GetKlass (void);

The XPath2 transform (http://www.w3.org/TR/xmldsig-filter2/).

#### Returns

XPath2 transform klass.

### xmlSecTransformXPointerGetKlass ()

    xmlSecTransformId
    xmlSecTransformXPointerGetKlass (void);

The XPointer transform klass (http://www.ietf.org/internet-drafts/draft-eastlake-xmldsig-uri-02.txt).

#### Returns

XPointer transform klass.

### xmlSecTransformXPointerSetExpr ()

    int
    xmlSecTransformXPointerSetExpr (xmlSecTransformPtr transform,
                                    const xmlChar *expr,
                                    xmlSecNodeSetType nodeSetType,
                                    xmlNodePtr hereNode);

Sets the XPointer expression for an XPointer `transform` .

#### Parameters

transform | the pointer to XPointer transform. |
expr | the XPointer expression. |
nodeSetType | the type of evaluated XPointer expression. |
hereNode | the pointer to "here" node. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformRelationshipGetKlass ()

    xmlSecTransformId
    xmlSecTransformRelationshipGetKlass (void);

Gets the Relationship transform klass.

#### Returns

Relationship transform klass.

### xmlSecTransformXsltGetKlass ()

    xmlSecTransformId
    xmlSecTransformXsltGetKlass (void);

XSLT transform klass (http://www.w3.org/TR/xmldsig-core/sec-XSLT):

The normative specification for XSL Transformations is [XSLT]. Specification of a namespace-qualified stylesheet element, which MUST be the sole child of the Transform element, indicates that the specified style sheet should be used. Whether this instantiates in-line processing of local XSLT declarations within the resource is determined by the XSLT processing model; the ordered application of multiple stylesheet may require multiple Transforms. No special provision is made for the identification of a remote stylesheet at a given URI because it can be communicated via an xsl:include or xsl:import within the stylesheet child of the Transform.

This transform requires an octet stream as input. If the actual input is an XPath node-set, then the signature application should attempt to convert it to octets (apply Canonical XML]) as described in the Reference Processing Model (section 4.3.3.2).]

The output of this transform is an octet stream. The processing rules for the XSL style sheet or transform element are stated in the XSLT specification [XSLT]. We RECOMMEND that XSLT transform authors use an output method of xml for XML and HTML. As XSLT implementations do not produce consistent serializations of their output, we further RECOMMEND inserting a transform after the XSLT transform to canonicalize the output. These steps will help to ensure interoperability of the resulting signatures among applications that support the XSLT transform. Note that if the output is actually HTML, then the result of these steps is logically equivalent [XHTML].

#### Returns

pointer to XSLT transform klass.

### xmlSecTransformXsltSetDefaultSecurityPrefs ()

    void
    xmlSecTransformXsltSetDefaultSecurityPrefs
                                   (xsltSecurityPrefsPtr sec);

Sets the new default security preferences. The xmlsec default security policy is to disable everything.

#### Parameters

sec | the new security preferences |

### xmlSecTransformRemoveXmlTagsC14NGetKlass ()

    xmlSecTransformId
    xmlSecTransformRemoveXmlTagsC14NGetKlass
                                   (void);

The "remove xml tags" transform klass (http://www.w3.org/TR/xmldsig-core/sec-Base-64): Base64 transform requires an octet stream for input. If an XPath node-set (or sufficiently functional alternative) is given as input, then it is converted to an octet stream by performing operations logically equivalent to 1) applying an XPath transform with expression self::`text()`, then 2) taking the string-value of the node-set. Thus, if an XML element is identified by a barename XPointer in the Reference URI, and its content consists solely of base64 encoded character data, then this transform automatically strips away the start and end tags of the identified element and any of its descendant elements as well as any descendant comments and processing instructions. The output of this transform is an octet stream.

#### Returns

"remove xml tags" transform id.

### xmlSecTransformVisa3DHackGetKlass ()

    xmlSecTransformId
    xmlSecTransformVisa3DHackGetKlass (void);

The Visa3DHack transform klass. The only reason why we need this is Visa3D protocol. It doesn't follow XML/XPointer/XMLDSig specs and allows invalid XPointer expressions in the URI attribute. Since we couldn't evaluate such expressions thru XPath/XPointer engine, we need to have this hack here.

#### Returns

Visa3DHack transform klass.

### xmlSecTransformVisa3DHackSetID ()

    int
    xmlSecTransformVisa3DHackSetID (xmlSecTransformPtr transform,
                                    const xmlChar *id);

Sets the ID value for an Visa3DHack `transform` .

#### Parameters

transform | the pointer to Visa3DHack transform. |
id | the ID value. |

#### Returns

0 on success or a negative value if an error occurs.

### xmlSecTransformHmacGetMinOutputBitsSize ()

    xmlSecSize
    xmlSecTransformHmacGetMinOutputBitsSize
                                   (void);

Gets the minimum size in bits for HMAC output.

#### Returns

the min HMAC output size in bits.

### xmlSecTransformHmacSetMinOutputBitsSize ()

    void
    xmlSecTransformHmacSetMinOutputBitsSize
                                   (xmlSecSize val);

Sets the min HMAC output size in bits. Low value for min output size might create a security vulnerability and is not recommended.

#### Parameters

val | the new min hmac output size in bits. |

## Types and Values

### enum xmlSecTransformStatus

The transform execution status.

#### Members

xmlSecTransformStatusNone | the status unknown. |
xmlSecTransformStatusWorking | the transform is executed. |
xmlSecTransformStatusFinished | the transform finished |
xmlSecTransformStatusOk | the transform succeeded. |
xmlSecTransformStatusFail | the transform failed (an error occur). |

### enum xmlSecTransformMode

The transform operation mode

#### Members

xmlSecTransformModeNone | the mode is unknown. |
xmlSecTransformModePush | pushing data thru transform. |
xmlSecTransformModePop | popping data from transform. |

### enum xmlSecTransformOperation

The transform operation.

#### Members

xmlSecTransformOperationNone | the operation is unknown. |
xmlSecTransformOperationEncode | the encode operation (for base64 transform). |
xmlSecTransformOperationDecode | the decode operation (for base64 transform). |
xmlSecTransformOperationSign | the sign or digest operation. |
xmlSecTransformOperationVerify | the verification of signature or digest operation. |
xmlSecTransformOperationEncrypt | the encryption operation. |
xmlSecTransformOperationDecrypt | the decryption operation. |

### xmlSecTransformUriType

    typedef unsigned int                            xmlSecTransformUriType;

URI transform type bit mask.

### xmlSecTransformUriTypeNone

    #define xmlSecTransformUriTypeNone              0x0000

The URI type is unknown or not set.

### xmlSecTransformUriTypeEmpty

    #define xmlSecTransformUriTypeEmpty             0x0001

The empty URI ("") type.

### xmlSecTransformUriTypeSameDocument

    #define xmlSecTransformUriTypeSameDocument      0x0002

The same document ("#...") but not empty ("") URI type.

### xmlSecTransformUriTypeLocal

    #define xmlSecTransformUriTypeLocal             0x0004

The local URI ("file:///....") type.

### xmlSecTransformUriTypeRemote

    #define xmlSecTransformUriTypeRemote            0x0008

The remote URI type.

### xmlSecTransformUriTypeAny

    #define xmlSecTransformUriTypeAny               0xFFFF

Any URI type.

### xmlSecTransformDataType

    typedef xmlSecByte                              xmlSecTransformDataType;

Transform data type bit mask.

### xmlSecTransformDataTypeUnknown

    #define xmlSecTransformDataTypeUnknown          0x0000

The transform data type is unknown or nor data expected.

### xmlSecTransformDataTypeBin

    #define xmlSecTransformDataTypeBin              0x0001

The binary transform data.

### xmlSecTransformDataTypeXml

    #define xmlSecTransformDataTypeXml              0x0002

The xml transform data.

### xmlSecTransformUsage

    typedef unsigned int                            xmlSecTransformUsage;

The transform usage bit mask.

### xmlSecTransformUsageUnknown

    #define xmlSecTransformUsageUnknown             0x0000

Transforms usage is unknown or undefined.

### xmlSecTransformUsageDSigTransform

    #define xmlSecTransformUsageDSigTransform       0x0001

Transform could be used in <dsig:Transform/>.

### xmlSecTransformUsageC14NMethod

    #define xmlSecTransformUsageC14NMethod          0x0002

Transform could be used in <dsig:CanonicalizationMethod/>.

### xmlSecTransformUsageDigestMethod

    #define xmlSecTransformUsageDigestMethod        0x0004

Transform could be used in <dsig:DigestMethod/>.

### xmlSecTransformUsageSignatureMethod

    #define xmlSecTransformUsageSignatureMethod     0x0008

Transform could be used in <dsig:SignatureMethod/>.

### xmlSecTransformUsageEncryptionMethod

    #define xmlSecTransformUsageEncryptionMethod    0x0010

Transform could be used in <enc:EncryptionMethod/>.

### xmlSecTransformUsageKeyDerivationMethod

    #define xmlSecTransformUsageKeyDerivationMethod 0x0020

Transform could be used in <enc11:KeyDerivationMethod/>.

### xmlSecTransformUsageAgreementMethod

    #define xmlSecTransformUsageAgreementMethod 0x0040

Transform could be used in <enc11:AgreementMethod/>.

### xmlSecTransformUsageAny

    #define xmlSecTransformUsageAny                 0xFFFF

Transform could be used for operation.

### XMLSEC_TRANSFORMCTX_FLAGS_USE_VISA3D_HACK

    #define XMLSEC_TRANSFORMCTX_FLAGS_USE_VISA3D_HACK               0x00000001

If this flag is set then URI ID references are resolved directly without using XPointers. This allows one to sign/verify Visa3D documents that don't follow XML, XPointer and XML DSig specifications.

### XMLSEC_TRANSFORMCTX_FLAGS_SUPPORT_ASN1_SIGNATURE_VALUES

    #define XMLSEC_TRANSFORMCTX_FLAGS_SUPPORT_ASN1_SIGNATURE_VALUES 0x00000002

If this flag is set then ASN1 encoded ECDSA signature values will be used (see https://github.com/lsh123/xmlsec/issues/995).

### struct xmlSecTransformCtx

    struct xmlSecTransformCtx {
        /* user settings */
        void*                                       userData;
        unsigned int                                flags;
        unsigned int                                flags2;
        xmlSecSize                                  binaryChunkSize;
        xmlSecTransformUriType                      enabledUris;
        xmlSecPtrList                               enabledTransforms;
        xmlSecTransformCtxPreExecuteCallback        preExecCallback;

        /* used by Key Agreement transforms */
        xmlSecKeyInfoCtxPtr                         parentKeyInfoCtx;

        /* results */
        xmlSecBufferPtr                             result;
        xmlSecTransformStatus                       status;
        xmlChar*                                    uri;
        xmlChar*                                    xptrExpr;
        xmlSecTransformPtr                          first;
        xmlSecTransformPtr                          last;

        /* for the future */
        void*                                       reserved0;
        void*                                       reserved1;
    };

The transform execution context.

#### Members

void *`userData`; | the pointer to user data (xmlsec and xmlsec-crypto never touch this). |
unsigned int `flags`; | the bit mask flags to control transforms execution (reserved for the future). |
unsigned int `flags2`; | the bit mask flags to control transforms execution (reserved for the future). |
xmlSecSize `binaryChunkSize`; | the chunk of size for binary transforms processing. |
xmlSecTransformUriType `enabledUris`; | the allowed transform data source uri types. |
xmlSecPtrList `enabledTransforms`; | the list of enabled transforms; if list is empty (default) then all registered transforms are enabled. |
xmlSecTransformCtxPreExecuteCallback `preExecCallback`; | the callback called after preparing transform chain and right before actual data processing; application can use this callback to change transforms parameters, insert additional transforms in the chain or do additional validation (and abort transform execution if needed). |
xmlSecKeyInfoCtxPtr `parentKeyInfoCtx`; | the parent's key info ctx for key agreement. |
xmlSecBufferPtr `result`; | the pointer to transforms result buffer. |
xmlSecTransformStatus `status`; | the transforms chain processing status. |
xmlChar *`uri`; | the data source URI without xpointer expression. |
xmlChar *`xptrExpr`; | the xpointer expression from data source URI (if any). |
xmlSecTransformPtr `first`; | the first transform in the chain. |
xmlSecTransformPtr `last`; | the last transform in the chain. |
void *`reserved0`; | reserved for the future. |
void *`reserved1`; | reserved for the future. |

### XMLSEC_TRANSFORM_FLAGS_USER_SPECIFIED

    #define XMLSEC_TRANSFORM_FLAGS_USER_SPECIFIED               0x00000001

If this flag is set then this transform was specified in the XML file (vs a transform added by the XMLSec library).

### struct xmlSecTransform

    struct xmlSecTransform {
        xmlSecTransformId                   id;
        xmlSecTransformOperation            operation;
        xmlSecTransformStatus               status;
        xmlNodePtr                          hereNode;

        /* transforms chain */
        xmlSecTransformPtr                  next;
        xmlSecTransformPtr                  prev;

        /* binary data */
        xmlSecBuffer                        inBuf;
        xmlSecBuffer                        outBuf;

        /* xml data */
        xmlSecNodeSetPtr                    inNodes;
        xmlSecNodeSetPtr                    outNodes;

        /* used for some transform (e.g. KDF) to determine the desired output size */
        xmlSecSize                          expectedOutputSize;

        /* transform flags (use uintptr_t to insure struct size stays the same) )*/
        uintptr_t                           flags;

        /* reserved for the future */
        void*                               reserved0;
    };

The transform structure.

#### Members

xmlSecTransformId `id`; | the transform id (pointer to xmlSecTransformId). |
xmlSecTransformOperation `operation`; | the transform's operation. |
xmlSecTransformStatus `status`; | the current status. |
xmlNodePtr `hereNode`; | the pointer to transform's <dsig:Transform /> node. |
xmlSecTransformPtr `next`; | the pointer to next transform in the chain. |
xmlSecTransformPtr `prev`; | the pointer to previous transform in the chain. |
xmlSecBuffer `inBuf`; | the input binary data buffer. |
xmlSecBuffer `outBuf`; | the output binary data buffer. |
xmlSecNodeSetPtr `inNodes`; | the input XML nodes. |
xmlSecNodeSetPtr `outNodes`; | the output XML nodes. |
xmlSecSize `expectedOutputSize`; | the expected transform output size (used for key wraps). |
uintptr_t `flags`; | the transform flags (eg user specified vs inserted by XMLSec). |
void *`reserved0`; | reserved for the future. |

### struct xmlSecTransformKlass

    struct xmlSecTransformKlass {
        /* data */
        xmlSecSize                          klassSize;
        xmlSecSize                          objSize;
        const xmlChar*                      name;
        const xmlChar*                      href;
        xmlSecTransformUsage                usage;

        /* methods */
        xmlSecTransformInitializeMethod     initialize;
        xmlSecTransformFinalizeMethod       finalize;

        xmlSecTransformNodeReadMethod       readNode;
        xmlSecTransformNodeWriteMethod      writeNode;

        xmlSecTransformSetKeyRequirementsMethod     setKeyReq;
        xmlSecTransformSetKeyMethod         setKey;
        xmlSecTransformVerifyMethod         verify;
        xmlSecTransformGetDataTypeMethod    getDataType;

        xmlSecTransformPushBinMethod        pushBin;
        xmlSecTransformPopBinMethod         popBin;
        xmlSecTransformPushXmlMethod        pushXml;
        xmlSecTransformPopXmlMethod         popXml;

        /* low level method */
        xmlSecTransformExecuteMethod        execute;

        /* reserved for future */
        void*                               reserved0;
        void*                               reserved1;
    };

The transform klass description structure.

#### Members

xmlSecSize `klassSize`; | the transform klass structure size. |
xmlSecSize `objSize`; | the transform object size. |
const xmlChar *`name`; | the transform's name. |
const xmlChar *`href`; | the transform's identification string (href). |
xmlSecTransformUsage `usage`; | the allowed transforms usages. |
xmlSecTransformInitializeMethod `initialize`; | the initialization method. |
xmlSecTransformFinalizeMethod `finalize`; | the finalization (destroy) function. |
xmlSecTransformNodeReadMethod `readNode`; | the XML node read method. |
xmlSecTransformNodeWriteMethod `writeNode`; | the XML node write method. |
xmlSecTransformSetKeyRequirementsMethod `setKeyReq`; | the set key requirements method. |
xmlSecTransformSetKeyMethod `setKey`; | the set key method. |
xmlSecTransformVerifyMethod `verify`; | the verify method (for digest and signature transforms). |
xmlSecTransformGetDataTypeMethod `getDataType`; | the input/output data type query method. |
xmlSecTransformPushBinMethod `pushBin`; | the binary data "push thru chain" processing method. |
xmlSecTransformPopBinMethod `popBin`; | the binary data "pop from chain" procesing method. |
xmlSecTransformPushXmlMethod `pushXml`; | the XML data "push thru chain" processing method. |
xmlSecTransformPopXmlMethod `popXml`; | the XML data "pop from chain" procesing method. |
xmlSecTransformExecuteMethod `execute`; | the low level data processing method used by default implementations of `pushBin` , `popBin` , `pushXml` and `popXml` . |
void *`reserved0`; | reserved for the future. |
void *`reserved1`; | reserved for the future. |

### xmlSecTransformIdListId

    #define xmlSecTransformIdListId xmlSecTransformIdListGetKlass()

Transform klasses list klass.

### xmlSecTransformIdUnknown

    #define xmlSecTransformIdUnknown                        ((xmlSecTransformId)NULL)

The "unknown" transform id (NULL).

### xmlSecTransformBase64Id

    #define             xmlSecTransformBase64Id

The base64 encode transform klass.

### xmlSecTransformInclC14NId

    #define             xmlSecTransformInclC14NId

The regular (inclusive) C14N without comments transform klass.

### xmlSecTransformInclC14NWithCommentsId

    #define             xmlSecTransformInclC14NWithCommentsId

The regular (inclusive) C14N with comments transform klass.

### xmlSecTransformInclC14N11Id

    #define             xmlSecTransformInclC14N11Id

The regular (inclusive) C14N 1.1 without comments transform klass.

### xmlSecTransformInclC14N11WithCommentsId

    #define             xmlSecTransformInclC14N11WithCommentsId

The regular (inclusive) C14N 1.1 with comments transform klass.

### xmlSecTransformExclC14NId

    #define             xmlSecTransformExclC14NId

The exclusive C14N without comments transform klass.

### xmlSecTransformExclC14NWithCommentsId

    #define             xmlSecTransformExclC14NWithCommentsId

The exclusive C14N with comments transform klass.

### xmlSecTransformEnvelopedId

    #define             xmlSecTransformEnvelopedId

The "enveloped" transform klass.

### xmlSecTransformXPathId

    #define             xmlSecTransformXPathId

The XPath transform klass.

### xmlSecTransformXPath2Id

    #define             xmlSecTransformXPath2Id

The XPath2 transform klass.

### xmlSecTransformXPointerId

    #define             xmlSecTransformXPointerId

The XPointer transform klass.

### xmlSecTransformRelationshipId

    #define             xmlSecTransformRelationshipId

The Relationship transform klass.

### xmlSecTransformXsltId

    #define             xmlSecTransformXsltId

The XSLT transform klass.

### xmlSecTransformRemoveXmlTagsC14NId

    #define             xmlSecTransformRemoveXmlTagsC14NId

The "remove all xml tags" transform klass (used before base64 transforms).

### xmlSecTransformVisa3DHackId

    #define             xmlSecTransformVisa3DHackId

Selects node subtree by given node id string. The only reason why we need this is Visa3D protocol. It doesn't follow XML/XPointer/XMLDSig specs and allows invalid XPointer expressions in the URI attribute. Since we couldn't evaluate such expressions thru XPath/XPointer engine, we need to have this hack here.