org.bouncycastle.crypto.engines

Class NaccacheSternEngine

java.lang.Object
- org.bouncycastle.crypto.engines.NaccacheSternEngine

Implemented Interfaces:: AsymmetricBlockCipher

public class NaccacheSternEngine

extends java.lang.Object

implements AsymmetricBlockCipher

NaccacheStern Engine. For details on this cipher, please see http://www.gemplus.com/smart/rd/publications/pdf/NS98pkcs.pdf

Method Summary
`byte[]`	`addCryptedBlocks(byte[] block1, byte[] block2)` Adds the contents of two encrypted blocks mod sigma
`byte[]`	`encrypt(BigInteger plain)` Encrypts a BigInteger aka Plaintext with the public key.
`int`	`getInputBlockSize()` Returns the input block size of this algorithm.
`int`	`getOutputBlockSize()` Returns the output block size of this algorithm.
`void`	`init(boolean forEncryption, CipherParameters param)` Initializes this algorithm.
`byte[]`	`processBlock(byte[] in, int inOff, int len)` Process a single Block using the Naccache-Stern algorithm.
`byte[]`	`processData(byte[] data)` Convenience Method for data exchange with the cipher.
`void`	`setDebug(boolean debug)`

addCryptedBlocks

public byte[] addCryptedBlocks(byte[] block1,
                               byte[] block2)
            throws InvalidCipherTextException

Adds the contents of two encrypted blocks mod sigma
Parameters:
block1 - the first encrypted block
block2 - the second encrypted block
Returns:
encrypt((block1 + block2) mod sigma)
Throws:
InvalidCipherTextException -

encrypt

public byte[] encrypt(BigInteger plain)

Encrypts a BigInteger aka Plaintext with the public key.
Parameters:
plain - The BigInteger to encrypt
Returns:
The byte[] representation of the encrypted BigInteger (i.e. crypted.toByteArray())

getInputBlockSize

public int getInputBlockSize()

Returns the input block size of this algorithm.
Specified by:
getInputBlockSize in interface AsymmetricBlockCipher
See Also:
AsymmetricBlockCipher.getInputBlockSize()

getOutputBlockSize

public int getOutputBlockSize()

Returns the output block size of this algorithm.
Specified by:
getOutputBlockSize in interface AsymmetricBlockCipher
See Also:
AsymmetricBlockCipher.getOutputBlockSize()

init

public void init(boolean forEncryption,
                 CipherParameters param)

Initializes this algorithm. Must be called before all other Functions.
Specified by:
init in interface AsymmetricBlockCipher
See Also:
AsymmetricBlockCipher.init(boolean,CipherParameters)

processBlock

public byte[] processBlock(byte[] in,
                           int inOff,
                           int len)
            throws InvalidCipherTextException

Process a single Block using the Naccache-Stern algorithm.
Specified by:
processBlock in interface AsymmetricBlockCipher
See Also:
AsymmetricBlockCipher.processBlock(byte[],int,int)

processData

public byte[] processData(byte[] data)
            throws InvalidCipherTextException

Convenience Method for data exchange with the cipher. Determines blocksize and splits data to blocksize.
Parameters:
data - the data to be processed
Returns:
the data after it went through the NaccacheSternEngine.
Throws:
InvalidCipherTextException -

setDebug

public void setDebug(boolean debug)

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