iaik.security.ec.ecdsa

Class SHA256WithPlainECDSASignature

java.lang.Object

java.security.SignatureSpi

iaik.security.ec.ecdsa.SHA256WithPlainECDSASignature

public final class SHA256WithPlainECDSASignature
extends SignatureSpi

Signature engine for the ECDSA signature algorithm using SHA-256 as hash algorithm as defined by [1]. The signature value is encoded as (r || s) and not wrapped into a SEQUENCE as done by [2]. If the hash length is larger than the domain parameter length the hash is not truncated like in [2]; rather it is reduced modulo the order of the base point.

Note that instances of this class can only be initialized with keys of size greater than 256 bits.

References:

[1] Bundesamt fuer Sicherheit in der Informationstechnik (BSI), "Technical Guideline TR-03111 - Elliptic Curve Cryptography" , Version 1.11, April 2009.

[2] ANSI X9.62-2005, "American National Standard for Financial Services - The Elliptic Curve Digital Signature Algorithm (ECDSA)" , ASC X9, November 2005.

Author:

Christian Hanser

See Also:

NONEWithECDSASignature, SHA3_224WithECDSASignature, SHA3_256WithECDSASignature, SHA3_384WithECDSASignature, SHA3_512WithECDSASignature, SHAWithECDSASignature, SHA224WithECDSASignature, SHA256WithECDSASignature, SHA384WithECDSASignature, SHA512WithECDSASignature, RipeMD160WithECDSASignature, WhirlpoolWithECDSASignature, NONEWithPlainECDSASignature, SHAWithPlainECDSASignature, SHA224WithPlainECDSASignature, SHA384WithPlainECDSASignature, SHA512WithPlainECDSASignature, RipeMD160WithPlainECDSASignature, WhirlpoolWithPlainECDSASignature

Field Summary

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

Constructors

Constructor and Description
SHA256WithPlainECDSASignature() Creates a new instance.

Method Summary

Modifier and Type	Method and Description
protected Object	engineGetParameter(String param) Deprecated.
protected void	engineInitSign(PrivateKey privateKey)
protected void	engineInitSign(PrivateKey privateKey, SecureRandom random)
protected void	engineInitVerify(PublicKey publicKey)
protected void	engineSetParameter(AlgorithmParameterSpec params)
protected void	engineSetParameter(String param, Object value) Deprecated.
protected byte[]	engineSign()
protected void	engineUpdate(byte b)
protected void	engineUpdate(byte[] b, int off, int len)
protected void	engineUpdate(ByteBuffer byteBuffer)
protected boolean	engineVerify(byte[] sigBytes)

Methods inherited from class java.security.SignatureSpi

clone, engineGetParameters, engineSign, engineVerify

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA256WithPlainECDSASignature

public SHA256WithPlainECDSASignature()

Creates a new instance.

Method Detail

engineInitVerify

protected void engineInitVerify(PublicKey publicKey)
                         throws InvalidKeyException

Specified by:

engineInitVerify in class SignatureSpi

Throws:

InvalidKeyException

engineInitSign

protected void engineInitSign(PrivateKey privateKey)
                       throws InvalidKeyException

Specified by:

engineInitSign in class SignatureSpi

Throws:

InvalidKeyException

engineInitSign

protected void engineInitSign(PrivateKey privateKey,
                              SecureRandom random)
                       throws InvalidKeyException

Overrides:

engineInitSign in class SignatureSpi

Throws:

InvalidKeyException

engineUpdate

protected void engineUpdate(byte b)
                     throws SignatureException

Specified by:

engineUpdate in class SignatureSpi

Throws:

SignatureException

engineUpdate

protected void engineUpdate(byte[] b,
                            int off,
                            int len)
                     throws SignatureException

Specified by:

engineUpdate in class SignatureSpi

Throws:

SignatureException

engineUpdate

protected void engineUpdate(ByteBuffer byteBuffer)

Overrides:

engineUpdate in class SignatureSpi

engineSign

protected byte[] engineSign()
                     throws SignatureException

Specified by:

engineSign in class SignatureSpi

Throws:

SignatureException

engineVerify

protected boolean engineVerify(byte[] sigBytes)
                        throws SignatureException

Specified by:

engineVerify in class SignatureSpi

Throws:

SignatureException

engineSetParameter

@Deprecated
protected void engineSetParameter(String param,
                                              Object value)
                                       throws UnsupportedOperationException

Deprecated.

Specified by:

engineSetParameter in class SignatureSpi

Throws:

UnsupportedOperationException

engineGetParameter

@Deprecated
protected Object engineGetParameter(String param)
                                         throws UnsupportedOperationException

Deprecated.

Specified by:

engineGetParameter in class SignatureSpi

Throws:

UnsupportedOperationException

engineSetParameter

protected void engineSetParameter(AlgorithmParameterSpec params)
                           throws InvalidAlgorithmParameterException

Overrides:

engineSetParameter in class SignatureSpi

Throws:

InvalidAlgorithmParameterException