org.bouncycastle.crypto.signers
Interface DSAEncoding

All Known Implementing Classes:

PlainDSAEncoding, StandardDSAEncoding

public interface DSAEncoding

An interface for different encoding formats for DSA signatures.

Method Summary

java.math.BigInteger[]	decode(java.math.BigInteger n, byte[] encoding) Decode the (r, s) pair of a DSA signature.
byte[]	encode(java.math.BigInteger n, java.math.BigInteger r, java.math.BigInteger s) Encode the (r, s) pair of a DSA signature.

Method Detail

decode

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

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

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

encode

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

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

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