org.bouncycastle.crypto.signers

Class StandardDSAEncoding

java.lang.Object

org.bouncycastle.crypto.signers.StandardDSAEncoding

All Implemented Interfaces:

DSAEncoding

public class StandardDSAEncoding
extends Object
implements DSAEncoding

Field Summary

Fields

Modifier and Type	Field and Description
static StandardDSAEncoding	INSTANCE

Constructor Summary

Constructors

Constructor and Description
StandardDSAEncoding()

Method Summary

Modifier and Type	Method and Description
protected BigInteger	checkValue(BigInteger n, BigInteger x)
BigInteger[]	decode(BigInteger n, byte[] encoding) Decode the (r, s) pair of a DSA signature.
protected BigInteger	decodeValue(BigInteger n, ASN1Sequence s, int pos)
byte[]	encode(BigInteger n, BigInteger r, BigInteger s) Encode the (r, s) pair of a DSA signature.
protected void	encodeValue(BigInteger n, ASN1EncodableVector v, BigInteger x)

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final StandardDSAEncoding INSTANCE

Constructor Detail

StandardDSAEncoding

public StandardDSAEncoding()

Method Detail

encode

public byte[] encode(BigInteger n,
                     BigInteger r,
                     BigInteger s)
              throws IOException

Description copied from interface: DSAEncoding

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

Specified by:

encode in interface 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:

IOException

decode

public BigInteger[] decode(BigInteger n,
                           byte[] encoding)
                    throws IOException

Description copied from interface: DSAEncoding

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

Specified by:

decode in interface 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:

IOException

checkValue

protected BigInteger checkValue(BigInteger n,
                                BigInteger x)

decodeValue

protected BigInteger decodeValue(BigInteger n,
                                 ASN1Sequence s,
                                 int pos)

encodeValue

protected void encodeValue(BigInteger n,
                           ASN1EncodableVector v,
                           BigInteger x)