net.sf.mmm.crypto.asymmetric.sign

Class SignatureVerifierImplCryptorWithHash

java.lang.Object

net.sf.mmm.crypto.algorithm.AbstractSecurityAlgorithm

net.sf.mmm.crypto.asymmetric.sign.SignatureProcessorImplWithHash

net.sf.mmm.crypto.asymmetric.sign.SignatureVerifierImplCryptorWithHash

All Implemented Interfaces:

CryptoAlgorithm, SignatureProcessor, SignatureVerifier<SignatureBinary>, SignatureVerifierSimple, CryptoChunker, CryptoProcessor

public class SignatureVerifierImplCryptorWithHash
extends SignatureProcessorImplWithHash
implements SignatureVerifier<SignatureBinary>

Implementation of SignatureVerifier combining a Decryptor with a HashCreator.

Since:

1.0.0

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field and Description
private Decryptor	decryptor

Constructor Summary

Constructors

Constructor and Description
SignatureVerifierImplCryptorWithHash(HashCreator hashGenerator, Decryptor decryptor) The constructor.

Method Summary

Modifier and Type	Method and Description
protected Decryptor	getSignatureAlgorithm()
void	reset() Will reset the internal state of this object.
boolean	verifyAfterUpdate(byte[] signature, int offset, int length)

Methods inherited from class net.sf.mmm.crypto.asymmetric.sign.SignatureProcessorImplWithHash

getAlgorithm, getHashGenerator, update

Methods inherited from class net.sf.mmm.crypto.algorithm.AbstractSecurityAlgorithm

creationFailedException, creationFailedException, creationFailedException, creationFailedException, getAlgorithm, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.mmm.crypto.asymmetric.sign.SignatureVerifier

verify, verify, verify, verifyAfterUpdate, verifyUnsafe

Methods inherited from interface net.sf.mmm.crypto.asymmetric.sign.SignatureVerifierSimple

verify, verify, verify, verifyAfterUpdate

Methods inherited from interface net.sf.mmm.crypto.CryptoChunker

update, update, update

Methods inherited from interface net.sf.mmm.crypto.CryptoProcessor

process, process, process, process

Methods inherited from interface net.sf.mmm.crypto.algorithm.CryptoAlgorithm

getAlgorithm

Field Detail

decryptor

private final Decryptor decryptor

Constructor Detail

SignatureVerifierImplCryptorWithHash

public SignatureVerifierImplCryptorWithHash(HashCreator hashGenerator,
                                            Decryptor decryptor)

The constructor.

Parameters:

hashGenerator - the HashCreator to apply as extension.

decryptor - the Decryptor to extend.

Method Detail

getSignatureAlgorithm

protected Decryptor getSignatureAlgorithm()

Specified by:

getSignatureAlgorithm in class SignatureProcessorImplWithHash

Returns:

the CryptoAlgorithm to extend.

verifyAfterUpdate

public boolean verifyAfterUpdate(byte[] signature,
                                 int offset,
                                 int length)

Specified by:

verifyAfterUpdate in interface SignatureVerifierSimple

Parameters:

signature - the byte array with the signature as raw data.

offset - the index where to start reading data from signature.

length - the number of bytes to read from signature.

Returns:

true if the given signature is valid, false otherwise.

reset

public void reset()

Description copied from interface: CryptoProcessor

Will reset the internal state of this object. Please note that complex algorithms especially for Cryptor may not reusable. It is therefore preferable to always create a fresh instance for each cryptographic task.

Specified by:

reset in interface CryptoProcessor

Overrides:

reset in class SignatureProcessorImplWithHash

See Also:

MessageDigest.reset()