protected byte[] engineSign() throws SignatureException { byte[] hash = new byte[digest.getDigestSize()]; digest.doFinal(hash, 0); try { byte[] sigBytes = new byte[64]; BigInteger[] sig = signer.generateSignature(hash); byte[] r = sig[0].toByteArray(); byte[] s = sig[1].toByteArray(); if (s[0] != 0) { System.arraycopy(s, 0, sigBytes, 32 - s.length, s.length); } else { System.arraycopy(s, 1, sigBytes, 32 - (s.length - 1), s.length - 1); } if (r[0] != 0) { System.arraycopy(r, 0, sigBytes, 64 - r.length, r.length); } else { System.arraycopy(r, 1, sigBytes, 64 - (r.length - 1), r.length - 1); } return sigBytes; } catch (Exception e) { throw new SignatureException(e.toString()); } }
protected void engineInitVerify(PublicKey publicKey) throws InvalidKeyException { CipherParameters param; if (publicKey instanceof ECPublicKey) { param = ECUtil.generatePublicKeyParameter(publicKey); } else if (publicKey instanceof GOST3410Key) { param = GOST3410Util.generatePublicKeyParameter(publicKey); } else { try { byte[] bytes = publicKey.getEncoded(); publicKey = BouncyCastleProvider.getPublicKey(SubjectPublicKeyInfo.getInstance(bytes)); if (publicKey instanceof ECPublicKey) { param = ECUtil.generatePublicKeyParameter(publicKey); } else { throw new InvalidKeyException("can't recognise key type in DSA based signer"); } } catch (Exception e) { throw new InvalidKeyException("can't recognise key type in DSA based signer"); } } digest.reset(); signer.init(false, param); }
protected void engineInitSign(PrivateKey privateKey) throws InvalidKeyException { CipherParameters param; if (privateKey instanceof ECKey) { param = ECUtil.generatePrivateKeyParameter(privateKey); } else { param = GOST3410Util.generatePrivateKeyParameter(privateKey); } digest.reset(); if (random != null) { signer.init(true, new ParametersWithRandom(param, random)); } else { signer.init(true, param); } }
protected boolean engineVerify(byte[] sigBytes) throws SignatureException { byte[] hash = new byte[digest.getDigestSize()]; digest.doFinal(hash, 0); BigInteger[] sig; try { byte[] r = new byte[32]; byte[] s = new byte[32]; System.arraycopy(sigBytes, 0, s, 0, 32); System.arraycopy(sigBytes, 32, r, 0, 32); sig = new BigInteger[2]; sig[0] = new BigInteger(1, r); sig[1] = new BigInteger(1, s); } catch (Exception e) { throw new SignatureException("error decoding signature bytes."); } return signer.verifySignature(hash, sig[0], sig[1]); }