DigestingMessageSigner (Bouncy Castle Library 1.60 API Specification)

java.lang.Object
- org.bouncycastle.pqc.crypto.DigestingMessageSigner

All Implemented Interfaces:

Signer

Direct Known Subclasses:

DigestingStateAwareMessageSigner
```
public class DigestingMessageSigner
extends java.lang.Object
implements Signer
```
Implements the sign and verify functions for a Signature Scheme using a hash function to allow processing of large messages.

Constructor Summary

Constructors
Constructor Description

DigestingMessageSigner(MessageSigner messSigner, Digest messDigest)

Constructors
Constructor	Description
`DigestingMessageSigner(MessageSigner messSigner, Digest messDigest)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`generateSignature()`	This function signs the message that has been updated, making use of the private key.
`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)`	This function verifies the signature of the message that has been updated, with the aid of the public key.

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

- Constructor Detail
  - DigestingMessageSigner
```
public DigestingMessageSigner(MessageSigner messSigner,
                              Digest messDigest)
```
- 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.
  - generateSignature
```
public byte[] generateSignature()
```
    This function signs the message that has been updated, making use of the private key.
    
    Specified by:
    
    generateSignature in interface Signer
    
    Returns:
    
    the signature of the message.
  - update
```
public void update(byte b)
```
    Description copied from interface: Signer
    
    update the internal digest with the byte b
    
    Specified by:
    
    update in interface Signer
  - update
```
public void update(byte[] in,
                   int off,
                   int len)
```
    Description copied from interface: Signer
    
    update the internal digest with the byte array in
    
    Specified by:
    
    update in interface Signer
  - reset
```
public void reset()
```
    Description copied from interface: Signer
    
    reset the internal state
    
    Specified by:
    
    reset in interface Signer
  - verifySignature
```
public boolean verifySignature(byte[] signature)
```
    This function verifies the signature of the message that has been updated, with the aid of the public key.
    
    Specified by:
    
    verifySignature in interface Signer
    
    Parameters:
    
    signature - the signature of the message is given as a byte array.
    
    Returns:
    
    true if the signature has been verified, false otherwise.

Class DigestingMessageSigner

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DigestingMessageSigner

Method Detail

init

generateSignature

update

update

reset

verifySignature