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## org.bouncycastle.crypto.signers
Class ISO9796d2PSSSigner

    java.lang.Object
      org.bouncycastle.crypto.signers.ISO9796d2PSSSigner

All Implemented Interfaces:
  Signer, SignerWithRecovery

public class ISO9796d2PSSSigner
extends java.lang.Object
implements SignerWithRecovery

ISO9796-2 - mechanism using a hash function with recovery (scheme 2 and 3).

Note: the usual length for the salt is the length of the hash function used in bytes.

Field Summary
`static int` | `TRAILER_IMPLICIT`
`static int` | `TRAILER_RIPEMD128`
`static int` | `TRAILER_RIPEMD160`
`static int` | `TRAILER_SHA1`

Constructor Summary
`ISO9796d2PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int saltLength)` Constructor for a signer with an explicit digest trailer.
`ISO9796d2PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int saltLength, boolean implicit)` Generate a signer for the with either implicit or explicit trailers for ISO9796-2, scheme 2 or 3.

Method Summary
`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.
`void` | `reset()` reset the internal state
`void` | `update(byte b)` update the internal digest with the byte b
`void` | `update(byte[] in, int off, int len)` update the internal digest with the byte array in
`boolean` | `verifySignature(byte[] signature)` return true if the signature represents a ISO9796-2 signature for the passed in message.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### TRAILER_IMPLICIT

    public static final int TRAILER_IMPLICIT

See Also:
  Constant Field Values

### TRAILER_RIPEMD160

    public static final int TRAILER_RIPEMD160

See Also:
  Constant Field Values

### TRAILER_RIPEMD128

    public static final int TRAILER_RIPEMD128

See Also:
  Constant Field Values

### TRAILER_SHA1

    public static final int TRAILER_SHA1

See Also:
  Constant Field Values

Constructor Detail

### ISO9796d2PSSSigner

    public ISO9796d2PSSSigner(AsymmetricBlockCipher cipher,
                              Digest digest,
                              int saltLength,
                              boolean implicit)

  Generate a signer for the with either implicit or explicit trailers for ISO9796-2, scheme 2 or 3.

Parameters:
  `cipher` - base cipher to use for signature creation/verification
  `digest` - digest to use.
  `saltLength` - length of salt in bytes.
  `implicit` - whether or not the trailer is implicit or gives the hash.

### ISO9796d2PSSSigner

    public ISO9796d2PSSSigner(AsymmetricBlockCipher cipher,
                              Digest digest,
                              int saltLength)

  Constructor for a signer with an explicit digest trailer.

Parameters:
  `cipher` - cipher to use.
  `digest` - digest to sign with.
  `saltLength` - length of salt in bytes.

Method Detail

### init

    public void init(boolean forSigning,
                     CipherParameters param)

  Initialise the signer.

  Specified by:
    `init` in interface `Signer`
  Parameters:
    `forSigning` - true if for signing, false if for verification.
    `param` - parameters for signature generation/verification. If the parameters are for generation they should be a ParametersWithRandom, a ParametersWithSalt, or just an RSAKeyParameters object. If RSAKeyParameters are passed in a SecureRandom will be created.
  Throws:
    `java.lang.IllegalArgumentException` - if wrong parameter type or a fixed salt is passed in which is the wrong length.

### update

    public void update(byte b)

  update the internal digest with the byte b

  Specified by:
    `update` in interface `Signer`

### update

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

  update the internal digest with the byte array in

  Specified by:
    `update` in interface `Signer`

### reset

    public void reset()

  reset the internal state

  Specified by:
    `reset` in interface `Signer`

### generateSignature

    public byte[] generateSignature()
                             throws CryptoException

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

  Specified by:
    `generateSignature` in interface `Signer`
  Throws:
    `CryptoException`

### verifySignature

    public boolean verifySignature(byte[] signature)

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

  Specified by:
    `verifySignature` in interface `Signer`

### hasFullMessage

    public boolean hasFullMessage()

  Return true if the full message was recoveredMessage.

  Specified by:
    `hasFullMessage` in interface `SignerWithRecovery`
  Returns:
    true on full message recovery, false otherwise, or if not sure.
  See Also:
    `SignerWithRecovery.hasFullMessage()`

### getRecoveredMessage

    public byte[] getRecoveredMessage()

  Return a reference to the recoveredMessage message.

  Specified by:
    `getRecoveredMessage` in interface `SignerWithRecovery`
  Returns:
    the full/partial recoveredMessage message.
  See Also:
    `SignerWithRecovery.getRecoveredMessage()`

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