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

Modifier and Type	Method and Description
BigInteger[]	decode(BigInteger n, byte[] encoding) Decode the (r, s) pair of a DSA signature.
byte[]	encode(BigInteger n, BigInteger r, BigInteger s) Encode the (r, s) pair of a DSA signature.

Method Detail

decode

BigInteger[] decode(BigInteger n,
                    byte[] encoding)
             throws 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:

IOException

encode

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

IOException