RSACipher

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cryptix.jce.provider.rsa
Class RSACipher_OAEP

java.lang.Object
  javax.crypto.CipherSpi
      cryptix.jce.provider.rsa.RSACipher_OAEP

Direct Known Subclasses:: RSACipher_OAEP_MD2, RSACipher_OAEP_MD4, RSACipher_OAEP_MD5, RSACipher_OAEP_RIPEMD128, RSACipher_OAEP_RIPEMD160, RSACipher_OAEP_SHA1, RSACipher_OAEP_SHA256, RSACipher_OAEP_SHA384, RSACipher_OAEP_SHA512, RSACipher_OAEP_Tiger

public abstract class RSACipher_OAEP
extends javax.crypto.CipherSpi

Version:: $Revision: 1.2 $

Field Summary

private java.math.BigInteger _exp


private int _hLen


private int _k
          Byte-length of modulus (n), excluding sign bit.

private byte[] _lHash


private java.security.MessageDigest _md


private int _mode


private java.math.BigInteger _n


private java.math.BigInteger _p


private java.math.BigInteger _q


private java.security.SecureRandom _rng


private java.math.BigInteger _u


Constructor Summary

RSACipher_OAEP(java.lang.String hashName)


Method Summary

private byte[] concat(byte[] a, byte[] b)


private byte[] concat(byte[] a, byte[] b, byte[] c)


private byte[] concat(byte[] a, byte[] b, byte[] c, byte[] d)


protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen)
          Finishes a multi-part transformation or transforms a portion of a byte array, and returns the transformed bytes.

protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
          Finishes a multi-part transformation or transforms a portion of a byte array, and stores the transformed bytes in the supplied array.

protected int engineGetBlockSize()
          Returns the block size of the underlying cipher.

protected byte[] engineGetIV()
          Returns the initializaiton vector this cipher was initialized with, if any.

protected int engineGetKeySize(java.security.Key key)
          Return the length of the given key in bits.

protected int engineGetOutputSize(int inputLen)
          Returns the size, in bytes, an output buffer must be for a call to engineUpdate(byte[],int,int,byte[],int) 55 or engineDoFinal(byte[],int,int,byte[],int) 55 to succeed.

protected java.security.AlgorithmParameters engineGetParameters()
          Returns the parameters that this cipher is using.

protected void engineInit(int opmode, java.security.Key key, java.security.spec.AlgorithmParameterSpec params, java.security.SecureRandom random)
          Initializes this cipher with an operation mode, key, parameters, and source of randomness.

protected void engineInit(int opmode, java.security.Key key, java.security.AlgorithmParameters params, java.security.SecureRandom random)
          Initializes this cipher with an operation mode, key, parameters, and source of randomness.

protected void engineInit(int opmode, java.security.Key key, java.security.SecureRandom random)
          Initializes this cipher with an operation mode, key, and source of randomness.

protected void engineSetMode(java.lang.String mode)
          Set the mode in which this cipher is to run.

protected void engineSetPadding(java.lang.String padding)
          Set the method with which the input is to be padded.

protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen)
          Continue with a multi-part transformation, returning a new array of the transformed bytes.

protected int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
          Continue with a multi-part transformation, storing the transformed bytes into the specified array.

private byte[] mgf1(byte[] seed, int len)


private byte[] mgf1Hash(byte[] seed, byte c)


private byte[] RSAES_OAEP_DECRYPT(byte[] C)


private byte[] RSAES_OAEP_ENCRYPT(byte[] M)


private static byte[] xor(byte[] a, byte[] b)


Methods inherited from class javax.crypto.CipherSpi

engineDoFinal, engineUnwrap, engineUpdate, engineWrap

Methods inherited from class java.lang.Object

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

Field Detail

_md

private final java.security.MessageDigest _md

_hLen

private final int _hLen

_lHash

private final byte[] _lHash

_rng

private java.security.SecureRandom _rng

_n

private java.math.BigInteger _n

_exp

private java.math.BigInteger _exp

_p

private java.math.BigInteger _p

_q

private java.math.BigInteger _q

_u

private java.math.BigInteger _u

_k

private int _k

Byte-length of modulus (n), excluding sign bit.

_mode

private int _mode

Constructor Detail

RSACipher_OAEP

public RSACipher_OAEP(java.lang.String hashName)

Method Detail