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## org.bouncycastle.crypto.signers
Class ISO9796d2Signer

    java.lang.Object
      |
      +--org.bouncycastle.crypto.signers.ISO9796d2Signer

All Implemented Interfaces:
  Signer, SignerWithRecovery

public class ISO9796d2Signer
extends java.lang.Object
implements SignerWithRecovery

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

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

Constructor Summary
`ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest)` Constructor for a signer with an explicit digest trailer.
`ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)` Generate a signer for the with either implicit or explicit trailers for ISO9796-2.

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 for signing or verification.
`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

### TRAILER_RIPEMD160

    public static final int TRAILER_RIPEMD160

### TRAILER_RIPEMD128

    public static final int TRAILER_RIPEMD128

### TRAILER_SHA1

    public static final int TRAILER_SHA1

Constructor Detail

### ISO9796d2Signer

    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.

### ISO9796d2Signer

    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.

Method Detail

### init

    public void init(boolean forSigning,
                     CipherParameters param)

  Description copied from interface: `Signer`
  Initialise the signer for signing or verification.
  Specified by:
    `init` in interface `Signer`
  Following copied from interface: `org.bouncycastle.crypto.Signer`
  Parameters:
    `forSigning` - true if for signing, false otherwise
    `param` - necessary parameters.

### 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`

### 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.
  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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