# Class EncryptedPrivateKeyInfo

java.lang.Object
javax.crypto.EncryptedPrivateKeyInfo

All Implemented Interfaces:
  `DEREncodablePREVIEW`

public non-sealed class EncryptedPrivateKeyInfo extends Object implements DEREncodablePREVIEW
This class implements the `EncryptedPrivateKeyInfo` type as defined in PKCS #8.

Its ASN.1 definition is as follows:

    EncryptedPrivateKeyInfo ::=  SEQUENCE {
        encryptionAlgorithm   AlgorithmIdentifier,
        encryptedData   OCTET STRING }

    AlgorithmIdentifier  ::=  SEQUENCE  {
        algorithm              OBJECT IDENTIFIER,
        parameters             ANY DEFINED BY algorithm OPTIONAL  }

Since:
  1.4
See Also:
  - `PKCS8EncodedKeySpec`

## Constructor Summary

Constructors
Constructor
Description
`EncryptedPrivateKeyInfo(byte[] encoded)`
Constructs an `EncryptedPrivateKeyInfo` from a given encrypted PKCS#8 ASN.1 encoding.
`EncryptedPrivateKeyInfo(String algName, byte[] encryptedData)`
Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm name and the encrypted data.
`EncryptedPrivateKeyInfo(AlgorithmParameters algParams, byte[] encryptedData)`
Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm parameters and the encrypted data.

## Method Summary

Modifier and Type
Method
Description
`static EncryptedPrivateKeyInfo`
`encryptKey(PrivateKey key, char[] password)`
Preview.
Creates and encrypts an `EncryptedPrivateKeyInfo` from a given `PrivateKey` and password.
`static EncryptedPrivateKeyInfo`
`encryptKey(PrivateKey key, char[] password, String algorithm, AlgorithmParameterSpec params, Provider provider)`
Preview.
Creates and encrypts an `EncryptedPrivateKeyInfo` from a given `PrivateKey`.
`static EncryptedPrivateKeyInfo`
`encryptKey(PrivateKey key, Key encKey, String algorithm, AlgorithmParameterSpec params, Provider provider, SecureRandom random)`
Preview.
Creates and encrypts an `EncryptedPrivateKeyInfo` from the given `PrivateKey` using the `encKey` and given parameters.
`String`
`getAlgName()`
Returns the encryption algorithm.
`AlgorithmParameters`
`getAlgParameters()`
Returns the algorithm parameters used by the encryption algorithm.
`byte[]`
`getEncoded()`
Returns the ASN.1 encoding of this object.
`byte[]`
`getEncryptedData()`
Returns the encrypted data.
`PrivateKey`
`getKey(char[] password)`
Preview.
Extract the enclosed `PrivateKey` object from the encrypted data and return it.
`PrivateKey`
`getKey(Key decryptKey, Provider provider)`
Preview.
Extract the enclosed `PrivateKey` object from the encrypted data and return it.
`PKCS8EncodedKeySpec`
`getKeySpec(Key decryptKey)`
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.
`PKCS8EncodedKeySpec`
`getKeySpec(Key decryptKey, String providerName)`
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.
`PKCS8EncodedKeySpec`
`getKeySpec(Key decryptKey, Provider provider)`
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.
`PKCS8EncodedKeySpec`
`getKeySpec(Cipher cipher)`
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.

### Methods declared in class Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

## Constructor Details

### EncryptedPrivateKeyInfo

public EncryptedPrivateKeyInfo(byte[] encoded) throws IOException
Constructs an `EncryptedPrivateKeyInfo` from a given encrypted PKCS#8 ASN.1 encoding.

Parameters:
  `encoded` - the ASN.1 encoding of this object. The contents of the array are copied to protect against subsequent modification.
Throws:
  `NullPointerException` - if `encoded` is `null`.
  `IOException` - if error occurs when parsing the ASN.1 encoding.

### EncryptedPrivateKeyInfo

public EncryptedPrivateKeyInfo(String algName, byte[] encryptedData) throws NoSuchAlgorithmException
Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm name and the encrypted data.

Note: This constructor will use `null` as the value of the algorithm parameters. If the encryption algorithm has parameters whose value is not `null`, a different constructor, e.g. EncryptedPrivateKeyInfo(AlgorithmParameters, byte[]), should be used.

Parameters:
  `algName` - encryption algorithm name. See the Java Security Standard Algorithm Names document for information about standard Cipher algorithm names.
  `encryptedData` - encrypted data. The contents of `encryptedData` are copied to protect against subsequent modification when constructing this object.
Throws:
  `NullPointerException` - if `algName` or `encryptedData` is `null`.
  `IllegalArgumentException` - if `encryptedData` is empty, i.e. 0-length.
  `NoSuchAlgorithmException` - if the specified algName is not supported.
External Specifications
  - Java Security Standard Algorithm Names

### EncryptedPrivateKeyInfo

public EncryptedPrivateKeyInfo(AlgorithmParameters algParams, byte[] encryptedData) throws NoSuchAlgorithmException
Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm parameters and the encrypted data.

Parameters:
  `algParams` - the algorithm parameters for the encryption algorithm. `algParams.getEncoded()` should return the ASN.1 encoded bytes of the `parameters` field of the `AlgorithmIdentifier` component of the `EncryptedPrivateKeyInfo` type.
  `encryptedData` - encrypted data. The contents of `encryptedData` are copied to protect against subsequent modification when constructing this object.
Throws:
  `NullPointerException` - if `algParams` or `encryptedData` is `null`.
  `IllegalArgumentException` - if `encryptedData` is empty, i.e. 0-length.
  `NoSuchAlgorithmException` - if the specified algName of the specified `algParams` parameter is not supported.

## Method Details

### getAlgName

public String getAlgName()
Returns the encryption algorithm.

Note: Standard name is returned instead of the specified one in the constructor when such mapping is available. See the Java Security Standard Algorithm Names document for information about standard Cipher algorithm names.

Returns:
  the encryption algorithm name.
External Specifications
  - Java Security Standard Algorithm Names

### getAlgParameters

public AlgorithmParameters getAlgParameters()
Returns the algorithm parameters used by the encryption algorithm.

Returns:
  the algorithm parameters.

### getEncryptedData

public byte[] getEncryptedData()
Returns the encrypted data.

Returns:
  the encrypted data. Returns a new array each time this method is called.

### getKeySpec

public PKCS8EncodedKeySpec getKeySpec(Cipher cipher) throws InvalidKeySpecException
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.
Note: In order to successfully retrieve the enclosed PKCS8EncodedKeySpec object, `cipher` needs to be initialized to either Cipher.DECRYPT_MODE or Cipher.UNWRAP_MODE, with the same key and parameters used for generating the encrypted data.

Parameters:
  `cipher` - the initialized `Cipher` object which will be used for decrypting the encrypted data.
Returns:
  the PKCS8EncodedKeySpec object.
Throws:
  `NullPointerException` - if `cipher` is `null`.
  `InvalidKeySpecException` - if the given cipher is inappropriate for the encrypted data or the encrypted data is corrupted and cannot be decrypted.

### encryptKey

public static EncryptedPrivateKeyInfo encryptKey(PrivateKey key, char[] password, String algorithm, AlgorithmParameterSpec params, Provider provider)
`encryptKey` is a preview API of the Java platform.
Programs can only use `encryptKey` when preview features are enabled.
Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.
Creates and encrypts an `EncryptedPrivateKeyInfo` from a given `PrivateKey`. A valid password-based encryption (PBE) algorithm and password must be specified.

The PBE algorithm string format details can be found in the Cipher section of the Java Security Standard Algorithm Names Specification.

Implementation Note:
  The `jdk.epkcs8.defaultAlgorithm` Security Property defines the default encryption algorithm and the `AlgorithmParameterSpec` are the provider's algorithm defaults.
Parameters:
  `key` - the `PrivateKey` to be encrypted
  `password` - the password used in the PBE encryption. This array will be cloned before being used.
  `algorithm` - the PBE encryption algorithm. The default algorithm will be used if `null`. However, `null` is not allowed when `params` is non-null.
  `params` - the `AlgorithmParameterSpec` to be used with encryption. The provider default will be used if `null`.
  `provider` - the `Provider` will be used for PBE `SecretKeyFactory` generation and `Cipher` encryption operations. The default provider list will be used if `null`.
Returns:
  an `EncryptedPrivateKeyInfo`
Throws:
  `IllegalArgumentException` - on initialization errors based on the arguments passed to the method
  `RuntimeException` - on an encryption error
  `NullPointerException` - if the key or password are `null`. If `params` is non-null when `algorithm` is `null`.
Since:
  25

### encryptKey

public static EncryptedPrivateKeyInfo encryptKey(PrivateKey key, char[] password)
`encryptKey` is a preview API of the Java platform.
Programs can only use `encryptKey` when preview features are enabled.
Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.
Creates and encrypts an `EncryptedPrivateKeyInfo` from a given `PrivateKey` and password. Default algorithm and parameters are used.

Implementation Note:
  The `jdk.epkcs8.defaultAlgorithm` Security Property defines the default encryption algorithm and the `AlgorithmParameterSpec` are the provider's algorithm defaults.
Parameters:
  `key` - the `PrivateKey` to be encrypted
  `password` - the password used in the PBE encryption. This array will be cloned before being used.
Returns:
  an `EncryptedPrivateKeyInfo`
Throws:
  `IllegalArgumentException` - on initialization errors based on the arguments passed to the method
  `RuntimeException` - on an encryption error
  `NullPointerException` - when the `key` or `password` is `null`
Since:
  25

### encryptKey

public static EncryptedPrivateKeyInfo encryptKey(PrivateKey key, Key encKey, String algorithm, AlgorithmParameterSpec params, Provider provider, SecureRandom random)
`encryptKey` is a preview API of the Java platform.
Programs can only use `encryptKey` when preview features are enabled.
Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.
Creates and encrypts an `EncryptedPrivateKeyInfo` from the given `PrivateKey` using the `encKey` and given parameters.

Implementation Note:
  The `jdk.epkcs8.defaultAlgorithm` Security Property defines the default encryption algorithm and the `AlgorithmParameterSpec` are the provider's algorithm defaults.
Parameters:
  `key` - the `PrivateKey` to be encrypted
  `encKey` - the password-based encryption (PBE) `Key` used to encrypt `key`.
  `algorithm` - the PBE encryption algorithm. The default algorithm is will be used if `null`; however, `null` is not allowed when `params` is non-null.
  `params` - the `AlgorithmParameterSpec` to be used with encryption. The provider list default will be used if `null`.
  `provider` - the `Provider` is used for `Cipher` encryption operation. The default provider list will be used if `null`.
  `random` - the `SecureRandom` instance used during encryption. The default will be used if `null`.
Returns:
  an `EncryptedPrivateKeyInfo`
Throws:
  `IllegalArgumentException` - on initialization errors based on the arguments passed to the method
  `RuntimeException` - on an encryption error
  `NullPointerException` - if the `key` or `encKey` are `null`. If `params` is non-null, `algorithm` cannot be `null`.
Since:
  25

### getKey

public PrivateKey getKey(char[] password) throws GeneralSecurityException
`getKey` is a preview API of the Java platform.
Programs can only use `getKey` when preview features are enabled.
Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.
Extract the enclosed `PrivateKey` object from the encrypted data and return it.

Parameters:
  `password` - the password used in the PBE encryption. This array will be cloned before being used.
Returns:
  a `PrivateKey`
Throws:
  `GeneralSecurityException` - if an error occurs parsing or decrypting the encrypted data, or producing the key object.
  `NullPointerException` - if `password` is null
Since:
  25

### getKey

public PrivateKey getKey(Key decryptKey, Provider provider) throws GeneralSecurityException
`getKey` is a preview API of the Java platform.
Programs can only use `getKey` when preview features are enabled.
Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.
Extract the enclosed `PrivateKey` object from the encrypted data and return it.

Parameters:
  `decryptKey` - the decryption key and cannot be `null`
  `provider` - the `Provider` used for Cipher decryption and `PrivateKey` generation. A `null` value will use the default provider configuration.
Returns:
  a `PrivateKey`
Throws:
  `GeneralSecurityException` - if an error occurs parsing or decrypting the encrypted data, or producing the key object.
  `NullPointerException` - if `decryptKey` is null
Since:
  25

### getKeySpec

public PKCS8EncodedKeySpec getKeySpec(Key decryptKey) throws NoSuchAlgorithmException, InvalidKeyException
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.

Parameters:
  `decryptKey` - key used for decrypting the encrypted data.
Returns:
  the PKCS8EncodedKeySpec object.
Throws:
  `NullPointerException` - if `decryptKey` is `null`.
  `NoSuchAlgorithmException` - if cannot find appropriate cipher to decrypt the encrypted data.
  `InvalidKeyException` - if `decryptKey` cannot be used to decrypt the encrypted data or the decryption result is not a valid PKCS8KeySpec.
Since:
  1.5

### getKeySpec

public PKCS8EncodedKeySpec getKeySpec(Key decryptKey, String providerName) throws NoSuchProviderException, NoSuchAlgorithmException, InvalidKeyException
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.

Parameters:
  `decryptKey` - key used for decrypting the encrypted data.
  `providerName` - the name of provider whose cipher implementation will be used.
Returns:
  the PKCS8EncodedKeySpec object.
Throws:
  `NullPointerException` - if `decryptKey` or `providerName` is `null`.
  `NoSuchProviderException` - if no provider `providerName` is registered.
  `NoSuchAlgorithmException` - if cannot find appropriate cipher to decrypt the encrypted data.
  `InvalidKeyException` - if `decryptKey` cannot be used to decrypt the encrypted data or the decryption result is not a valid PKCS8KeySpec.
Since:
  1.5

### getKeySpec

public PKCS8EncodedKeySpec getKeySpec(Key decryptKey, Provider provider) throws NoSuchAlgorithmException, InvalidKeyException
Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.

Parameters:
  `decryptKey` - key used for decrypting the encrypted data.
  `provider` - the name of provider whose cipher implementation will be used.
Returns:
  the PKCS8EncodedKeySpec object.
Throws:
  `NullPointerException` - if `decryptKey` or `provider` is `null`.
  `NoSuchAlgorithmException` - if cannot find appropriate cipher to decrypt the encrypted data in `provider`.
  `InvalidKeyException` - if `decryptKey` cannot be used to decrypt the encrypted data or the decryption result is not a valid PKCS8KeySpec.
Since:
  1.5

### getEncoded

public byte[] getEncoded() throws IOException
Returns the ASN.1 encoding of this object.

Returns:
  the ASN.1 encoding. Returns a new array each time this method is called.
Throws:
  `IOException` - if error occurs when constructing its ASN.1 encoding.