rte_crypto_sym_op(3)

NAME
rte_crypto_sym_op

SYNOPSIS

#include <rte_crypto_sym.h>

  Data Fields

struct rte_mbuf * m_src
struct rte_mbuf * m_dst

Detailed Description

Symmetric Cryptographic Operation.

This structure contains data relating to performing symmetric cryptographic processing on a referenced mbuf data buffer.

When a symmetric crypto operation is enqueued with the device for processing it must have a valid rte_mbuf structure attached, via m_src parameter, which contains the source data which the crypto operation is to be performed on. While the mbuf is in use by a crypto operation no part of the mbuf should be changed by the application as the device may read or write to any part of the mbuf. In the case of hardware crypto devices some or all of the mbuf may be DMAed in and out of the device, so writing over the original data, though only the part specified by the rte_crypto_sym_op for transformation will be changed. Out-of-place (OOP) operation, where the source mbuf is different to the destination mbuf, is a special case. Data will be copied from m_src to m_dst. The part copied includes all the parts of the source mbuf that will be operated on, based on the cipher.data.offset+cipher.data.length and auth.data.offset+auth.data.length values in the rte_crypto_sym_op. The part indicated by the cipher parameters will be transformed, any extra data around this indicated by the auth parameters will be copied unchanged from source to destination mbuf. Also in OOP operation the cipher.data.offset and auth.data.offset apply to both source and destination mbufs. As these offsets are relative to the data_off parameter in each mbuf this can result in the data written to the destination buffer being at a different alignment, relative to buffer start, to the data in the source buffer.

Definition at line 628 of file rte_crypto_sym.h.

Field Documentation

  struct rte_mbuf* m_src
source mbuf

Definition at line 629 of file rte_crypto_sym.h.

  struct rte_mbuf* m_dst
destination mbuf

Definition at line 630 of file rte_crypto_sym.h.

  void* session
Handle for the initialised crypto/security session context

Definition at line 633 of file rte_crypto_sym.h.

  struct rte_crypto_sym_xform* xform
Session-less API crypto operation parameters

Definition at line 635 of file rte_crypto_sym.h.

  uint32_t offset
Starting point for AEAD processing, specified as number of bytes from start of packet in source buffer.

Starting point for cipher processing, specified as number of bytes from start of data in the source buffer. The result of the cipher operation will be written back into the output buffer starting at this location.

Note
    For SNOW 3G @ RTE_CRYPTO_CIPHER_SNOW3G_UEA2, KASUMI @ RTE_CRYPTO_CIPHER_KASUMI_F8 and ZUC @ RTE_CRYPTO_CIPHER_ZUC_EEA3, this field should be in bits. For digest-encrypted cases this must be an 8-bit multiple.

Starting point for hash processing, specified as number of bytes from start of packet in source buffer.

Note
    For SNOW 3G @ RTE_CRYPTO_AUTH_SNOW3G_UIA2, KASUMI @ RTE_CRYPTO_AUTH_KASUMI_F9 and ZUC @ RTE_CRYPTO_AUTH_ZUC_EIA3, this field should be in bits. For digest-encrypted cases this must be an 8-bit multiple.

    For KASUMI @ RTE_CRYPTO_AUTH_KASUMI_F9, this offset should be such that data to authenticate starts at COUNT.

    For DOCSIS security protocol, this offset is the DOCSIS header length and, therefore, also the CRC offset i.e. the number of bytes into the packet at which CRC calculation should begin.

Definition at line 642 of file rte_crypto_sym.h.

  uint32_t length
The message length, in bytes, of the source buffer on which the cryptographic operation will be computed.

The message length, in bytes, of the source buffer on which the cryptographic operation will be computed. This is also the same as the result length. For block ciphers, this must be a multiple of the block size, or for the AES-XTS a multiple of the data-unit length as described in xform.

Note
    For SNOW 3G @ RTE_CRYPTO_AUTH_SNOW3G_UEA2, KASUMI @ RTE_CRYPTO_CIPHER_KASUMI_F8 and ZUC @ RTE_CRYPTO_CIPHER_ZUC_EEA3, this field should be in bits. For digest-encrypted cases this must be an 8-bit multiple.

The message length, in bytes, of the source buffer that the hash will be computed on.

Note
    For SNOW 3G @ RTE_CRYPTO_AUTH_SNOW3G_UIA2, KASUMI @ RTE_CRYPTO_AUTH_KASUMI_F9 and ZUC @ RTE_CRYPTO_AUTH_ZUC_EIA3, this field should be in bits. For digest-encrypted cases this must be an 8-bit multiple.

    For KASUMI @ RTE_CRYPTO_AUTH_KASUMI_F9, the length should include the COUNT, FRESH, message, direction bit and padding (to be multiple of 8 bits).

    For DOCSIS security protocol, this is the CRC length i.e. the number of bytes in the packet over which the CRC should be calculated

Definition at line 647 of file rte_crypto_sym.h.

  struct { ... } data
Data offsets and length for AEAD

  uint8_t* data
This points to the location where the digest result should be inserted (in the case of digest generation) or where the purported digest exists (in the case of digest verification).

At session creation time, the client specified the digest result length with the digest_length member of the rte_crypto_auth_xform structure. For physical crypto devices the caller must allocate at least digest_length of physically contiguous memory at this location.

For digest generation, the digest result will overwrite any data at this location.

Note
    For GCM (RTE_CRYPTO_AEAD_AES_GCM), for "digest result" read "authentication tag T".

Pointer to Additional Authenticated Data (AAD) needed for authenticated cipher mechanisms (CCM and GCM)

Specifically for CCM (RTE_CRYPTO_AEAD_AES_CCM), the caller should setup this field as follows:

•   the additional authentication data itself should be written starting at an offset of 18 bytes into the array, leaving room for the first block (16 bytes) and the length encoding in the first two bytes of the second block.

•   Note that PMDs may modify the memory reserved (first 18 bytes and the final padding).

Finally, for GCM (RTE_CRYPTO_AEAD_AES_GCM), the caller should setup this field as follows:

This points to the location where the digest result should be inserted (in the case of digest generation) or where the purported digest exists (in the case of digest verification).

At session creation time, the client specified the digest result length with the digest_length member of the rte_crypto_auth_xform structure. For physical crypto devices the caller must allocate at least digest_length of physically contiguous memory at this location.

For digest generation, the digest result will overwrite any data at this location.

Note
    Digest-encrypted case. Digest can be generated, appended to the end of raw data and encrypted together using chained digest generation (RTE_CRYPTO_AUTH_OP_GENERATE) and encryption (RTE_CRYPTO_CIPHER_OP_ENCRYPT) xforms. Similarly, authentication of the raw data against appended, decrypted digest, can be performed using decryption (RTE_CRYPTO_CIPHER_OP_DECRYPT) and digest verification (RTE_CRYPTO_AUTH_OP_VERIFY) chained xforms. To perform those operations, a few additional conditions must be met:

    •   caller must allocate at least digest_length of memory at the end of source and (in case of out-of-place operations) destination buffer; those buffers can be linear or split using scatter-gather lists,

    •   digest data pointer must point to the end of source or (in case of out-of-place operations) destination data, which is pointer to the data buffer + auth.data.offset + auth.data.length,

    •   cipher.data.offset + cipher.data.length must be greater than auth.data.offset + auth.data.length and is typically equal to auth.data.offset + auth.data.length + digest_length.

    •   for wireless algorithms, i.e. SNOW 3G, KASUMI and ZUC, as the cipher.data.length, cipher.data.offset, auth.data.length and auth.data.offset are in bits, they must be 8-bit multiples.

Note, that for security reasons, it is PMDs' responsibility to not leave an unencrypted digest in any buffer after performing auth-cipher operations.

Definition at line 654 of file rte_crypto_sym.h.

  rte_iova_t phys_addr
Physical address of digest

physical address

Definition at line 674 of file rte_crypto_sym.h.

  struct { ... } digest
Digest parameters

  struct { ... } aad
Additional authentication parameters

  struct { ... } data
Data offsets and length for ciphering

  struct { ... } data
Data offsets and length for authentication

  struct { ... } digest
Digest parameters

Author

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