net.sf.mmm.crypto.asymmetric.sign.ec.bc

Class SignatureEcBc

java.lang.Object

net.sf.mmm.binary.api.BinaryType

net.sf.mmm.crypto.CryptoBinary

net.sf.mmm.crypto.asymmetric.sign.SignatureBinary

net.sf.mmm.crypto.asymmetric.sign.ec.bc.SignatureEcBc

All Implemented Interfaces:

net.sf.mmm.binary.api.Binary, net.sf.mmm.binary.api.Streamable

Direct Known Subclasses:

SignatureEcBcPlain, SignatureEcBcWithRecoveryId

public abstract class SignatureEcBc
extends SignatureBinary

SignatureBinary for ECDSA based on BouncyCastle.

Since:

1.0.0

Field Summary

Fields

Modifier and Type	Field and Description
private CryptoEllipticCurveBc	curve
private BigInteger	r
private BigInteger	s

Fields inherited from class net.sf.mmm.binary.api.BinaryType

data

Fields inherited from interface net.sf.mmm.binary.api.Binary

EMPTY_BYTE_ARRAY

Constructor Summary

Constructors

Constructor and Description
SignatureEcBc(CryptoEllipticCurveBc curve, byte[] data) The constructor.
SignatureEcBc(CryptoEllipticCurveBc curve, byte[] data, BigInteger r, BigInteger s) The constructor.

Method Summary

Modifier and Type	Method and Description
protected static byte	calculateRecoveryIndex(byte[] message, CryptoEllipticCurveBc curve, BigInteger r, BigInteger s, org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey publicKey)
protected static byte[]	createData(int head, BigInteger r, BigInteger s)
protected void	deserialize() Initializes the internal fields like r and s from binary data.
protected CryptoEllipticCurveBc	getCurve()
protected int	getHead()
BigInteger	getR()
BigInteger	getS()
private void	initRS()
protected org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey	recoverPublicKey(byte[] message, byte recoveryIndex)
protected static org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey	recoverPublicKey(byte[] message, CryptoEllipticCurveBc curve, BigInteger r, BigInteger s, byte recoveryIndex)

Methods inherited from class net.sf.mmm.binary.api.BinaryType

asStream, equals, format, formatBase64, formatHex, getData, getData, getDataByte, getLength, getMaxLength, getMinLength, hashCode, isZeros, parseBase64, parseHex, save, toBytes, toBytes, toInt, toLong, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.mmm.binary.api.Binary

formatBase64, formatHex

Field Detail

curve

private final CryptoEllipticCurveBc curve

r

private BigInteger r

s

private BigInteger s

Constructor Detail

SignatureEcBc

public SignatureEcBc(CryptoEllipticCurveBc curve,
                     byte[] data,
                     BigInteger r,
                     BigInteger s)

The constructor.

Parameters:

curve - the elliptic curve.

data - the binary data.

r - - see getR().

s - - see getS().

SignatureEcBc

public SignatureEcBc(CryptoEllipticCurveBc curve,
                     byte[] data)

The constructor.

Parameters:

curve - the elliptic curve.

data - the binary data.

Method Detail

initRS

private void initRS()

getHead

protected int getHead()

Returns:

number of bytes reserved at the beginning (header) of the binary data.

deserialize

protected void deserialize()

Initializes the internal fields like r and s from binary data.

createData

protected static byte[] createData(int head,
                                   BigInteger r,
                                   BigInteger s)

Parameters:

head - the number of bytes reserved at the beginning.

r - the value r.

s - the value s.

Returns:

the binary data.

getR

public BigInteger getR()

Returns:

r

getS

public BigInteger getS()

Returns:

s

getCurve

protected CryptoEllipticCurveBc getCurve()

Returns:

the elliptic curve.

recoverPublicKey

protected org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey recoverPublicKey(byte[] message,
                                                                                        byte recoveryIndex)

Parameters:

message - the payload (typically hash of message) that was signed when this signature was created.

recoveryIndex - the recovery index for public key recovery.

Returns:

the recovered public key.

calculateRecoveryIndex

protected static byte calculateRecoveryIndex(byte[] message,
                                             CryptoEllipticCurveBc curve,
                                             BigInteger r,
                                             BigInteger s,
                                             org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey publicKey)

Parameters:

message - the payload (typically hash of message) that was signed when this signature was created.

curve - the elliptic curve.

r - value R.

s - value S.

publicKey - the public key corresponding to the private key that was used to sign the message.

Returns:

the recovery index.

recoverPublicKey

protected static org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey recoverPublicKey(byte[] message,
                                                                                               CryptoEllipticCurveBc curve,
                                                                                               BigInteger r,
                                                                                               BigInteger s,
                                                                                               byte recoveryIndex)

Parameters:

message - the payload (typically hash of message) that was signed when this signature was created.

curve - the elliptic curve.

r - value R.

s - value S.

recoveryIndex - the recovery index for public key recovery.

Returns:

the recovered public key.