org.bouncycastle.crypto.signers
Class PlainDSAEncoding

java.lang.Object
  |
  +--org.bouncycastle.crypto.signers.PlainDSAEncoding

All Implemented Interfaces:

DSAEncoding

public class PlainDSAEncoding

extends java.lang.Object

implements DSAEncoding

Field Summary

static PlainDSAEncoding

INSTANCE

Constructor Summary

PlainDSAEncoding()

Method Summary

protected java.math.BigInteger	checkValue(java.math.BigInteger n, java.math.BigInteger x)
java.math.BigInteger[]	decode(java.math.BigInteger n, byte[] encoding) Decode the (r, s) pair of a DSA signature.
protected java.math.BigInteger	decodeValue(java.math.BigInteger n, byte[] buf, int off, int len)
byte[]	encode(java.math.BigInteger n, java.math.BigInteger r, java.math.BigInteger s) Encode the (r, s) pair of a DSA signature.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final PlainDSAEncoding INSTANCE

Constructor Detail

PlainDSAEncoding

public PlainDSAEncoding()

Method Detail

encode

public byte[] encode(java.math.BigInteger n,
                     java.math.BigInteger r,
                     java.math.BigInteger s)

Description copied from interface: DSAEncoding

Encode the (r, s) pair of a DSA signature.

Specified by:

encode in interface DSAEncoding

Following copied from interface: org.bouncycastle.crypto.signers.DSAEncoding

Parameters:

n - the order of the group that r, s belong to.

r - the r value of a DSA signature.

s - the s value of a DSA signature.

Returns:

an encoding of the DSA signature given by the provided (r, s) pair.

Throws:

java.io.IOException -

decode

public java.math.BigInteger[] decode(java.math.BigInteger n,
                                     byte[] encoding)

Description copied from interface: DSAEncoding

Decode the (r, s) pair of a DSA signature.

Specified by:

decode in interface DSAEncoding

Following copied from interface: org.bouncycastle.crypto.signers.DSAEncoding

Parameters:

n - the order of the group that r, s belong to.

encoding - an encoding of the (r, s) pair of a DSA signature.

Returns:

the (r, s) of a DSA signature, stored in an array of exactly two elements, r followed by s.

Throws:

java.io.IOException -

checkValue

protected java.math.BigInteger checkValue(java.math.BigInteger n,
                                          java.math.BigInteger x)

decodeValue

protected java.math.BigInteger decodeValue(java.math.BigInteger n,
                                           byte[] buf,
                                           int off,
                                           int len)