public class

ISO9796d2Signer

extends Object
implements SignerWithRecovery
java.lang.Object
   ↳ org.bouncycastle.crypto.signers.ISO9796d2Signer

Class Overview

ISO9796-2 - mechanism using a hash function with recovery (scheme 1)

Summary

Constants
int TRAILER_IMPLICIT
int TRAILER_RIPEMD128
int TRAILER_RIPEMD160
int TRAILER_SHA1
int TRAILER_SHA256
int TRAILER_SHA384
int TRAILER_SHA512
int TRAILER_WHIRLPOOL
Public Constructors
ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)
Generate a signer for the with either implicit or explicit trailers for ISO9796-2.
ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest)
Constructor for a signer with an explicit digest trailer.
Public Methods
byte[] generateSignature()
generate a signature for the loaded message using the key we were initialised with.
byte[] getRecoveredMessage()
Return a reference to the recoveredMessage message.
boolean hasFullMessage()
Return true if the full message was recoveredMessage.
void init(boolean forSigning, CipherParameters param)
Initialise the signer for signing or verification.
void reset()
reset the internal state
void update(byte[] in, int off, int len)
update the internal digest with the byte array in
void update(byte b)
update the internal digest with the byte b
void updateWithRecoveredMessage(byte[] signature)
Perform an update with the recovered message before adding any other data.
boolean verifySignature(byte[] signature)
return true if the signature represents a ISO9796-2 signature for the passed in message.
[Expand]
Inherited Methods
From class java.lang.Object
From interface org.bouncycastle.crypto.Signer
From interface org.bouncycastle.crypto.SignerWithRecovery

Constants

public static final int TRAILER_IMPLICIT

Constant Value: 188 (0x000000bc)

public static final int TRAILER_RIPEMD128

Constant Value: 13004 (0x000032cc)

public static final int TRAILER_RIPEMD160

Constant Value: 12748 (0x000031cc)

public static final int TRAILER_SHA1

Constant Value: 13260 (0x000033cc)

public static final int TRAILER_SHA256

Constant Value: 13516 (0x000034cc)

public static final int TRAILER_SHA384

Constant Value: 14028 (0x000036cc)

public static final int TRAILER_SHA512

Constant Value: 13772 (0x000035cc)

public static final int TRAILER_WHIRLPOOL

Constant Value: 14284 (0x000037cc)

Public Constructors

public ISO9796d2Signer (AsymmetricBlockCipher cipher, Digest digest, boolean implicit)

Generate a signer for the with either implicit or explicit trailers for ISO9796-2.

Parameters
cipher base cipher to use for signature creation/verification
digest digest to use.
implicit whether or not the trailer is implicit or gives the hash.

public ISO9796d2Signer (AsymmetricBlockCipher cipher, Digest digest)

Constructor for a signer with an explicit digest trailer.

Parameters
cipher cipher to use.
digest digest to sign with.

Public Methods

public byte[] generateSignature ()

generate a signature for the loaded message using the key we were initialised with.

Throws
CryptoException

public byte[] getRecoveredMessage ()

Return a reference to the recoveredMessage message.

Returns
  • the full/partial recoveredMessage message.
See Also

public boolean hasFullMessage ()

Return true if the full message was recoveredMessage.

Returns
  • true on full message recovery, false otherwise.
See Also

public void init (boolean forSigning, CipherParameters param)

Initialise the signer for signing or verification.

Parameters
forSigning true if for signing, false otherwise
param necessary parameters.

public void reset ()

reset the internal state

public void update (byte[] in, int off, int len)

update the internal digest with the byte array in

public void update (byte b)

update the internal digest with the byte b

public void updateWithRecoveredMessage (byte[] signature)

Perform an update with the recovered message before adding any other data. This must be the first update method called, and calling it will result in the signer assuming that further calls to update will include message content past what is recoverable.

Parameters
signature the signature that we are in the process of verifying.
Throws
InvalidCipherTextException

public boolean verifySignature (byte[] signature)

return true if the signature represents a ISO9796-2 signature for the passed in message.