Module java.base
Package javax.crypto

Class 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 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. The contents of the array are copied to protect against subsequent modification.
        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: 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 encrypedData 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.

      • 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 AlgorithmIdentifer component of the EncryptedPrivateKeyInfo type.
        encryptedData - encrypted data. The contents of encrypedData 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 Detail

      • 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.

      • 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.

      • 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.