public boolean verifyRawSignature(
SignatureAndHashAlgorithm algorithm,
byte[] sigBytes,
AsymmetricKeyParameter publicKey,
byte[] hash)
throws CryptoException {
Signer signer = makeSigner(algorithm, true, false, publicKey);
signer.update(hash, 0, hash.length);
return signer.verifySignature(sigBytes);
}
public byte[] generateRawSignature(
SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey, byte[] hash)
throws CryptoException {
Signer signer =
makeSigner(
algorithm,
true,
true,
new ParametersWithRandom(privateKey, this.context.getSecureRandom()));
signer.update(hash, 0, hash.length);
return signer.generateSignature();
}
protected Signer makeSigner(
SignatureAndHashAlgorithm algorithm, boolean raw, boolean forSigning, CipherParameters cp) {
if ((algorithm != null) != TlsUtils.isTLSv12(context)) {
throw new IllegalStateException();
}
if (algorithm != null && algorithm.getSignature() != SignatureAlgorithm.rsa) {
throw new IllegalStateException();
}
Digest d;
if (raw) {
d = new NullDigest();
} else if (algorithm == null) {
d = new CombinedHash();
} else {
d = TlsUtils.createHash(algorithm.getHash());
}
Signer s;
if (algorithm != null) {
/*
* RFC 5246 4.7. In RSA signing, the opaque vector contains the signature generated
* using the RSASSA-PKCS1-v1_5 signature scheme defined in [PKCS1].
*/
s = new RSADigestSigner(d, TlsUtils.getOIDForHashAlgorithm(algorithm.getHash()));
} else {
/*
* RFC 5246 4.7. Note that earlier versions of TLS used a different RSA signature scheme
* that did not include a DigestInfo encoding.
*/
s = new GenericSigner(createRSAImpl(), d);
}
s.init(forSigning, cp);
return s;
}