org.bouncycastle.crypto.signers

Class ECNRSigner

public class ECNRSigner extends Object implements DSA

EC-NR as described in IEEE 1363-2000
Method Summary
BigInteger[]generateSignature(byte[] digest)
generate a signature for the given message using the key we were initialised with.
voidinit(boolean forSigning, CipherParameters param)
booleanverifySignature(byte[] digest, BigInteger r, BigInteger s)
return true if the value r and s represent a signature for the message passed in.

Method Detail

generateSignature

public BigInteger[] generateSignature(byte[] digest)
generate a signature for the given message using the key we were initialised with. Generally, the order of the curve should be at least as long as the hash of the message of interest, and with ECNR it *must* be at least as long.

Parameters: digest the digest to be signed.

Throws: DataLengthException if the digest is longer than the key allows

init

public void init(boolean forSigning, CipherParameters param)

verifySignature

public boolean verifySignature(byte[] digest, BigInteger r, BigInteger s)
return true if the value r and s represent a signature for the message passed in. Generally, the order of the curve should be at least as long as the hash of the message of interest, and with ECNR, it *must* be at least as long. But just in case the signer applied mod(n) to the longer digest, this implementation will apply mod(n) during verification.

Parameters: digest the digest to be verified. r the r value of the signature. s the s value of the signature.

Throws: DataLengthException if the digest is longer than the key allows