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## org.bouncycastle.crypto.signers
Class X931Signer

    java.lang.Object
      org.bouncycastle.crypto.signers.X931Signer

All Implemented Interfaces:
  Signer

public class X931Signer
extends java.lang.Object
implements Signer

X9.31-1998 - signing using a hash.

The message digest hash, H, is encapsulated to form a byte string as follows EB = 06 || PS || 0xBA || H || TRAILER where PS is a string of bytes all of value 0xBB of length such that |EB|=|n|, and TRAILER is the ISO/IEC 10118 part number† for the digest. The byte string, EB, is converted to an integer value, the message representative, f.

Field Summary
`static int` | `TRAILER_IMPLICIT` Deprecated. use ISOTrailers
`static int` | `TRAILER_RIPEMD128` Deprecated. use ISOTrailers
`static int` | `TRAILER_RIPEMD160` Deprecated. use ISOTrailers
`static int` | `TRAILER_SHA1` Deprecated. use ISOTrailers
`static int` | `TRAILER_SHA224` Deprecated. use ISOTrailers
`static int` | `TRAILER_SHA256` Deprecated. use ISOTrailers
`static int` | `TRAILER_SHA384` Deprecated. use ISOTrailers
`static int` | `TRAILER_SHA512` Deprecated. use ISOTrailers
`static int` | `TRAILER_WHIRLPOOL` Deprecated. use ISOTrailers

Constructor Summary
`X931Signer(AsymmetricBlockCipher cipher, Digest digest)` Constructor for a signer with an explicit digest trailer.
`X931Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)` Generate a signer with either implicit or explicit trailers for X9.31

Method Summary
`byte[]` | `generateSignature()` generate a signature for the loaded message using the key we were initialised with.
`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 X9.31 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

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_RIPEMD160

    public static final int TRAILER_RIPEMD160

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_RIPEMD128

    public static final int TRAILER_RIPEMD128

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_SHA1

    public static final int TRAILER_SHA1

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_SHA256

    public static final int TRAILER_SHA256

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_SHA512

    public static final int TRAILER_SHA512

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_SHA384

    public static final int TRAILER_SHA384

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_WHIRLPOOL

    public static final int TRAILER_WHIRLPOOL

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

### TRAILER_SHA224

    public static final int TRAILER_SHA224

  Deprecated. use ISOTrailers

  See Also:
    Constant Field Values

Constructor Detail

### X931Signer

    public X931Signer(AsymmetricBlockCipher cipher,
                      Digest digest,
                      boolean implicit)

  Generate a signer with either implicit or explicit trailers for X9.31

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.

### X931Signer

    public X931Signer(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`
  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`
  Throws:
    `CryptoException`

### verifySignature

    public boolean verifySignature(byte[] signature)

  return true if the signature represents a X9.31 signature for the passed in message.

  Specified by:
    `verifySignature` in interface `Signer`

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