/**
* Initialize the signer.
*
* @param forSigning Whether to initialize signer for the sign operation.
* @param params BC cipher parameters.
*/
protected void init(final boolean forSigning, final CipherParameters params) {
if (forSigning && randomProvider != null) {
signer.init(forSigning, new ParametersWithRandom(params, randomProvider));
} else {
signer.init(forSigning, params);
}
}
/** {@inheritDoc} */
public boolean verify(final InputStream in, final byte[] signature)
throws CryptException, IOException {
final BigInteger[] sig = decode(signature);
return signer.verifySignature(digest.digest(in), sig[0], sig[1]);
}
/** {@inheritDoc} */
public byte[] sign(final InputStream in) throws CryptException, IOException {
final BigInteger[] out = signer.generateSignature(digest.digest(in));
return encode(out[0], out[1]);
}
/** {@inheritDoc} */
public boolean verify(final byte[] data, final byte[] signature) throws CryptException {
final BigInteger[] sig = decode(signature);
return signer.verifySignature(digest.digest(data), sig[0], sig[1]);
}
/** {@inheritDoc} */
public byte[] sign(final byte[] data) throws CryptException {
final BigInteger[] out = signer.generateSignature(digest.digest(data));
return encode(out[0], out[1]);
}