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## org.bouncycastle.crypto.signers
Class PSSSigner

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

All Implemented Interfaces:
  Signer

    public class PSSSigner

extends java.lang.Object
implements Signer

RSA-PSS as described in PKCS# 1 v 2.1.

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

Field Summary
`static byte` | `TRAILER_IMPLICIT`

Constructor Summary
`PSSSigner(AsymmetricBlockCipher cipher, Digest contentDigest, Digest mgfDigest, int sLen, byte trailer)`
`PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int sLen)` basic constructor
`PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int sLen, byte trailer)`

Method Summary
`byte[]` | `generateSignature()` generate a signature for the message we've been loaded with 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 internal state represents the signature described in the passed in array.

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 byte TRAILER_IMPLICIT

See Also:
  Constant Field Values

Constructor Detail

### PSSSigner

    public PSSSigner(AsymmetricBlockCipher cipher,
                     Digest digest,
                     int sLen)

  basic constructor

  Parameters:
    `cipher` - the asymmetric cipher to use.
    `digest` - the digest to use.
    `sLen` - the length of the salt to use (in bytes).

### PSSSigner

    public PSSSigner(AsymmetricBlockCipher cipher,
                     Digest digest,
                     int sLen,
                     byte trailer)

### PSSSigner

    public PSSSigner(AsymmetricBlockCipher cipher,
                     Digest contentDigest,
                     Digest mgfDigest,
                     int sLen,
                     byte trailer)

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,
                                    DataLengthException

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

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

### verifySignature

    public boolean verifySignature(byte[] signature)

  return true if the internal state represents the signature described in the passed in array.

  Specified by:
    `verifySignature` in interface `Signer`

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