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## javax.crypto
Class EncryptedPrivateKeyInfo

    java.lang.Object
      javax.crypto.EncryptedPrivateKeyInfo

public class EncryptedPrivateKeyInfo
extends Object

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
`EncryptedPrivateKeyInfo(AlgorithmParameters algParams, byte[] encryptedData)` Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm parameters and the encrypted data.
`EncryptedPrivateKeyInfo(byte[] encoded)` Constructs (i.e., parses) an `EncryptedPrivateKeyInfo` from its ASN.1 encoding.
`EncryptedPrivateKeyInfo(String algName, byte[] encryptedData)` Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm name and the encrypted data.

Method Summary
`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 a copy of the encrypted data.
`PKCS8EncodedKeySpec` | `getKeySpec(Cipher c)` Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### EncryptedPrivateKeyInfo

    public EncryptedPrivateKeyInfo(byte[] encoded)
                            throws IOException

  Constructs (i.e., parses) an `EncryptedPrivateKeyInfo` from its ASN.1 encoding.

Parameters:
  `encoded` - the ASN.1 encoding of this object.
Throws:
  `NullPointerException` - if the `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: the `encrypedData` is cloned when constructing this object. If encryption algorithm has associated parameters use the constructor with AlgorithmParameters as the parameter.

Parameters:
  `algName` - algorithm name.
  `encryptedData` - encrypted data.
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.

### EncryptedPrivateKeyInfo

    public EncryptedPrivateKeyInfo(AlgorithmParameters algParams,
                                   byte[] encryptedData)
                            throws NoSuchAlgorithmException

  Constructs an `EncryptedPrivateKeyInfo` from the encryption algorithm parameters and the encrypted data.

  Note: the `encrypedData` is cloned when constructing this object.

Parameters:
  `algParams` - the algorithm parameters for the encryption algorithm. `algParams.getEncoded()` should return the ASN.1 encoded bytes of the `parameters` field of the `AlgorithmIdentifer` component of the `EncryptedPrivateKeyInfo` type.
  `encryptedData` - encrypted data.
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 Detail

### getAlgName

    public String getAlgName()

  Returns the encryption algorithm.

  Returns:
    the algorithm name.

### getAlgParameters

    public AlgorithmParameters getAlgParameters()

  Returns the algorithm parameters used by the encryption algorithm.

  Returns:
    the algorithm parameters.

### getEncryptedData

    public byte[] getEncryptedData()

  Returns a copy of the encrypted data.

  Returns:
    a copy of the encrypted data.

### getKeySpec

    public PKCS8EncodedKeySpec getKeySpec(Cipher c)
                                   throws InvalidKeySpecException

  Extract the enclosed PKCS8EncodedKeySpec object from the encrypted data and return it.

  Returns:
    the PKCS8EncodedKeySpec object.
  Throws:
    `InvalidKeySpecException` - if the given cipher is inappropriate for the encrypted data or the encrypted data is corrupted and cannot be decrypted.

### getEncoded

    public byte[] getEncoded()
                      throws IOException

  Returns the ASN.1 encoding of this object.

  Returns:
    the ASN.1 encoding.
  Throws:
    `IOException` - if error occurs when constructing its ASN.1 encoding.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.