java.lang.Object
- org.bouncycastle.crypto.signers.SM2Signer

All Implemented Interfaces:: Signer, ECConstants

public class SM2Signer
extends java.lang.Object
implements Signer, ECConstants

The SM2 Digital Signature algorithm.

Field Summary
- Fields inherited from interface org.bouncycastle.math.ec.ECConstants
  EIGHT, FOUR, ONE, THREE, TWO, ZERO

Constructor Summary

Constructors
Constructor Description

SM2Signer()

SM2Signer(Digest digest)

SM2Signer(DSAEncoding encoding)

SM2Signer(DSAEncoding encoding, Digest digest)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected java.math.BigInteger`	`calculateE(java.math.BigInteger n, byte[] message)`
`protected ECMultiplier`	`createBasePointMultiplier()`
`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

- Constructor Detail
  - SM2Signer
```
public SM2Signer()
```
  - SM2Signer
```
public SM2Signer(Digest digest)
```
  - SM2Signer
```
public SM2Signer(DSAEncoding encoding)
```
  - SM2Signer
```
public SM2Signer(DSAEncoding encoding,
                 Digest digest)
```
- 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)
```
    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
  - verifySignature
```
public boolean verifySignature(byte[] signature)
```
    Description copied from interface: Signer
    
    return true if the internal state represents the signature described in the passed in array.
    
    Specified by:
    
    verifySignature in interface Signer
  - reset
```
public void reset()
```
    Description copied from interface: Signer
    
    reset the internal state
    
    Specified by:
    
    reset in interface Signer
  - generateSignature
```
public byte[] generateSignature()
                         throws CryptoException
```
    Description copied from interface: Signer
    
    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
  - createBasePointMultiplier
```
protected ECMultiplier createBasePointMultiplier()
```
  - calculateE
```
protected java.math.BigInteger calculateE(java.math.BigInteger n,
                                          byte[] message)
```

Constructor	Description
`SM2Signer()`
`SM2Signer(Digest digest)`
`SM2Signer(DSAEncoding encoding)`
`SM2Signer(DSAEncoding encoding, Digest digest)`

Class SM2Signer

Field Summary

Fields inherited from interface org.bouncycastle.math.ec.ECConstants

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

SM2Signer

SM2Signer

SM2Signer

SM2Signer

Method Detail

init

update

update

verifySignature

reset

generateSignature

createBasePointMultiplier

calculateE