Bouncy Castle Cryptography 1.28

org.bouncycastle.jce.provider
Class JCEElGamalCipher

java.lang.Object
  extended byjavax.crypto.CipherSpi
      extended byorg.bouncycastle.jce.provider.WrapCipherSpi
          extended byorg.bouncycastle.jce.provider.JCEElGamalCipher
All Implemented Interfaces:
PBE
Direct Known Subclasses:
JCEElGamalCipher.NoPadding, JCEElGamalCipher.PKCS1v1_5Padding

public class JCEElGamalCipher
extends WrapCipherSpi


Nested Class Summary
static class JCEElGamalCipher.NoPadding
          classes that inherit from us.
static class JCEElGamalCipher.PKCS1v1_5Padding
           
 
Nested classes inherited from class org.bouncycastle.jce.provider.WrapCipherSpi
WrapCipherSpi.AESWrap, WrapCipherSpi.DESEDEWrap, WrapCipherSpi.RC2Wrap
 
Nested classes inherited from class org.bouncycastle.jce.provider.PBE
PBE.Util
 
Field Summary
 
Fields inherited from class org.bouncycastle.jce.provider.WrapCipherSpi
engineParams, pbeHash, pbeIvSize, pbeKeySize, pbeType, wrapEngine
 
Fields inherited from interface org.bouncycastle.jce.provider.PBE
MD5, OPENSSL, PKCS12, PKCS5S1, PKCS5S2, RIPEMD160, SHA1, SHA256, TIGER
 
Constructor Summary
JCEElGamalCipher(AsymmetricBlockCipher engine)
           
JCEElGamalCipher(boolean publicKeyOnly, boolean privateKeyOnly, AsymmetricBlockCipher engine)
           
 
Method Summary
protected  byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen)
          Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
protected  int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
          Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
protected  int engineGetBlockSize()
          Returns the block size (in bytes).
protected  byte[] engineGetIV()
          Returns the initialization vector (IV) in a new buffer.
protected  int engineGetKeySize(java.security.Key key)
          Returns the key size of the given key object.
protected  int engineGetOutputSize(int inputLen)
          Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or doFinal operation, given the input length inputLen (in bytes).
protected  AlgorithmParameters engineGetParameters()
          Returns the parameters used with this cipher.
protected  void engineInit(int opmode, java.security.Key key, AlgorithmParameterSpec params, java.security.SecureRandom random)
          Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.
protected  void engineInit(int opmode, java.security.Key key, AlgorithmParameters params, java.security.SecureRandom random)
          Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.
protected  void engineInit(int opmode, java.security.Key key, java.security.SecureRandom random)
          Initializes this cipher with a key and a source of randomness.
protected  void engineSetMode(java.lang.String mode)
          Sets the mode of this cipher.
protected  void engineSetPadding(java.lang.String padding)
          Sets the padding mechanism of this cipher.
protected  byte[] engineUpdate(byte[] input, int inputOffset, int inputLen)
          Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.
protected  int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
          Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.
 
Methods inherited from class org.bouncycastle.jce.provider.WrapCipherSpi
engineUnwrap, engineWrap
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

JCEElGamalCipher

public JCEElGamalCipher(AsymmetricBlockCipher engine)

JCEElGamalCipher

public JCEElGamalCipher(boolean publicKeyOnly,
                        boolean privateKeyOnly,
                        AsymmetricBlockCipher engine)
Method Detail

engineGetBlockSize

protected int engineGetBlockSize()
Description copied from class: CipherSpi
Returns the block size (in bytes).

Overrides:
engineGetBlockSize in class WrapCipherSpi

engineGetIV

protected byte[] engineGetIV()
Description copied from class: CipherSpi
Returns the initialization vector (IV) in a new buffer.

This is useful in the context of password-based encryption or decryption, where the IV is derived from a user-provided passphrase.

Overrides:
engineGetIV in class WrapCipherSpi

engineGetKeySize

protected int engineGetKeySize(java.security.Key key)
Description copied from class: CipherSpi
Returns the key size of the given key object.

This concrete method has been added to this previously-defined abstract class. It throws an UnsupportedOperationException if it is not overridden by the provider.

Overrides:
engineGetKeySize in class WrapCipherSpi

engineGetOutputSize

protected int engineGetOutputSize(int inputLen)
Description copied from class: CipherSpi
Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or doFinal operation, given the input length inputLen (in bytes).

This call takes into account any unprocessed (buffered) data from a previous update call, and padding.

The actual output length of the next update or doFinal call may be smaller than the length returned by this method.

Overrides:
engineGetOutputSize in class WrapCipherSpi

engineGetParameters

protected AlgorithmParameters engineGetParameters()
Description copied from class: CipherSpi
Returns the parameters used with this cipher.

The returned parameters may be the same that were used to initialize this cipher, or may contain a combination of default and random parameter values used by the underlying cipher implementation if this cipher requires algorithm parameters but was not initialized with any.

Overrides:
engineGetParameters in class WrapCipherSpi

engineSetMode

protected void engineSetMode(java.lang.String mode)
Description copied from class: CipherSpi
Sets the mode of this cipher.

Overrides:
engineSetMode in class WrapCipherSpi

engineSetPadding

protected void engineSetPadding(java.lang.String padding)
                         throws NoSuchPaddingException
Description copied from class: CipherSpi
Sets the padding mechanism of this cipher.

Overrides:
engineSetPadding in class WrapCipherSpi
Throws:
NoSuchPaddingException

engineInit

protected void engineInit(int opmode,
                          java.security.Key key,
                          AlgorithmParameterSpec params,
                          java.security.SecureRandom random)
                   throws java.security.InvalidKeyException
Description copied from class: CipherSpi
Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.

The cipher is initialized for one of the following four operations: encryption, decryption, key wrapping or key unwrapping, depending on the value of opmode.

If this cipher requires any algorithm parameters and params is null, the underlying cipher implementation is supposed to generate the required parameters itself (using provider-specific default or random values) if it is being initialized for encryption or key wrapping, and raise an InvalidAlgorithmParameterException if it is being initialized for decryption or key unwrapping. The generated parameters can be retrieved using engineGetParameters or engineGetIV (if the parameter is an IV).

If this cipher (including its underlying feedback or padding scheme) requires any random bytes (e.g., for parameter generation), it will get them from random.

Note that when a Cipher object is initialized, it loses all previously-acquired state. In other words, initializing a Cipher is equivalent to creating a new instance of that Cipher and initializing it.

Overrides:
engineInit in class WrapCipherSpi
Throws:
java.security.InvalidKeyException

engineInit

protected void engineInit(int opmode,
                          java.security.Key key,
                          AlgorithmParameters params,
                          java.security.SecureRandom random)
                   throws java.security.InvalidKeyException,
                          InvalidAlgorithmParameterException
Description copied from class: CipherSpi
Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.

The cipher is initialized for one of the following four operations: encryption, decryption, key wrapping or key unwrapping, depending on the value of opmode.

If this cipher requires any algorithm parameters and params is null, the underlying cipher implementation is supposed to generate the required parameters itself (using provider-specific default or random values) if it is being initialized for encryption or key wrapping, and raise an InvalidAlgorithmParameterException if it is being initialized for decryption or key unwrapping. The generated parameters can be retrieved using engineGetParameters or engineGetIV (if the parameter is an IV).

If this cipher (including its underlying feedback or padding scheme) requires any random bytes (e.g., for parameter generation), it will get them from random.

Note that when a Cipher object is initialized, it loses all previously-acquired state. In other words, initializing a Cipher is equivalent to creating a new instance of that Cipher and initializing it.

Overrides:
engineInit in class WrapCipherSpi
Throws:
java.security.InvalidKeyException
InvalidAlgorithmParameterException

engineInit

protected void engineInit(int opmode,
                          java.security.Key key,
                          java.security.SecureRandom random)
                   throws java.security.InvalidKeyException
Description copied from class: CipherSpi
Initializes this cipher with a key and a source of randomness.

The cipher is initialized for one of the following four operations: encryption, decryption, key wrapping or key unwrapping, depending on the value of opmode.

If this cipher requires any algorithm parameters that cannot be derived from the given key, the underlying cipher implementation is supposed to generate the required parameters itself (using provider-specific default or random values) if it is being initialized for encryption or key wrapping, and raise an InvalidKeyException if it is being initialized for decryption or key unwrapping. The generated parameters can be retrieved using engineGetParameters or engineGetIV (if the parameter is an IV).

If this cipher (including its underlying feedback or padding scheme) requires any random bytes (e.g., for parameter generation), it will get them from random.

Note that when a Cipher object is initialized, it loses all previously-acquired state. In other words, initializing a Cipher is equivalent to creating a new instance of that Cipher and initializing it.

Overrides:
engineInit in class WrapCipherSpi
Throws:
java.security.InvalidKeyException

engineUpdate

protected byte[] engineUpdate(byte[] input,
                              int inputOffset,
                              int inputLen)
Description copied from class: CipherSpi
Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, are processed, and the result is stored in a new buffer.

Overrides:
engineUpdate in class WrapCipherSpi

engineUpdate

protected int engineUpdate(byte[] input,
                           int inputOffset,
                           int inputLen,
                           byte[] output,
                           int outputOffset)
Description copied from class: CipherSpi
Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, are processed, and the result is stored in the output buffer, starting at outputOffset inclusive.

If the output buffer is too small to hold the result, a ShortBufferException is thrown.

Overrides:
engineUpdate in class WrapCipherSpi

engineDoFinal

protected byte[] engineDoFinal(byte[] input,
                               int inputOffset,
                               int inputLen)
                        throws IllegalBlockSizeException,
                               BadPaddingException
Description copied from class: CipherSpi
Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. The data is encrypted or decrypted, depending on how this cipher was initialized.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, and any input bytes that may have been buffered during a previous update operation, are processed, with padding (if requested) being applied. The result is stored in a new buffer.

A call to this method resets this cipher object to the state it was in when previously initialized via a call to engineInit. That is, the object is reset and available to encrypt or decrypt (depending on the operation mode that was specified in the call to engineInit) more data.

Overrides:
engineDoFinal in class WrapCipherSpi
Throws:
IllegalBlockSizeException
BadPaddingException

engineDoFinal

protected int engineDoFinal(byte[] input,
                            int inputOffset,
                            int inputLen,
                            byte[] output,
                            int outputOffset)
                     throws IllegalBlockSizeException,
                            BadPaddingException
Description copied from class: CipherSpi
Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. The data is encrypted or decrypted, depending on how this cipher was initialized.

The first inputLen bytes in the input buffer, starting at inputOffset inclusive, and any input bytes that may have been buffered during a previous update operation, are processed, with padding (if requested) being applied. The result is stored in the output buffer, starting at outputOffset inclusive.

If the output buffer is too small to hold the result, a ShortBufferException is thrown.

A call to this method resets this cipher object to the state it was in when previously initialized via a call to engineInit. That is, the object is reset and available to encrypt or decrypt (depending on the operation mode that was specified in the call to engineInit) more data.

Overrides:
engineDoFinal in class WrapCipherSpi
Throws:
IllegalBlockSizeException
BadPaddingException

Bouncy Castle Cryptography 1.28