Java Code Examples for org.spongycastle.asn1.ASN1InputStream#close()

The following examples show how to use org.spongycastle.asn1.ASN1InputStream#close() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: BTCUtils.java    From BlockchainWallet-Crypto with GNU General Public License v3.0 6 votes vote down vote up 
public static boolean verify(byte[] publicKey, byte[] signature, byte[] msg) {
    X9ECParameters params = SECNamedCurves.getByName("secp256k1");
    ECDomainParameters EC_PARAMS = new ECDomainParameters(params.getCurve(), params.getG(), params.getN(), params.getH());
    synchronized (EC_PARAMS) {
        boolean valid;
        ECDSASigner signerVer = new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest()));
        try {
            ECPublicKeyParameters pubKey = new ECPublicKeyParameters(EC_PARAMS.getCurve().decodePoint(publicKey), EC_PARAMS);
            signerVer.init(false, pubKey);
            ASN1InputStream derSigStream = new ASN1InputStream(signature);
            DLSequence seq = (DLSequence) derSigStream.readObject();
            BigInteger r = ((ASN1Integer) seq.getObjectAt(0)).getPositiveValue();
            BigInteger s = ((ASN1Integer) seq.getObjectAt(1)).getPositiveValue();
            derSigStream.close();
            valid = signerVer.verifySignature(msg, r, s);
        } catch (IOException e) {
            throw new RuntimeException();
        }
        return valid;
    }
}
Example 2
Source File: ECKey.java    From bitherj with Apache License 2.0 6 votes vote down vote up 
private static BigInteger extractPrivateKeyFromASN1(byte[] asn1privkey) {
    // To understand this code, see the definition of the ASN.1 format for EC private keys in the OpenSSL source
    // code in ec_asn1.c:
    //
    // ASN1_SEQUENCE(EC_PRIVATEKEY) = {
    //   ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
    //   ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
    //   ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
    //   ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
    // } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
    //
    try {
        ASN1InputStream decoder = new ASN1InputStream(asn1privkey);
        DLSequence seq = (DLSequence) decoder.readObject();
        checkArgument(seq.size() == 4, "Input does not appear to be an ASN.1 OpenSSL EC private key");
        checkArgument(((ASN1Integer) seq.getObjectAt(0)).getValue().equals(BigInteger.ONE),
                "Input is of wrong version");
        Object obj = seq.getObjectAt(1);
        byte[] bits = ((ASN1OctetString) obj).getOctets();
        decoder.close();
        return new BigInteger(1, bits);
    } catch (IOException e) {
        throw new RuntimeException(e);  // Cannot happen, reading from memory stream.
    }
}
Example 3
Source File: Asn1.java    From UAF with Apache License 2.0 5 votes vote down vote up 
/**
 	 * DER - From byte[] to Big Integer rs
 	 * UAF_ALG_SIGN_SECP256K1_ECDSA_SHA256_DER 0x06
 	 * DER [ITU-X690-2008] encoded ECDSA signature [RFC5480] on the secp256k1 curve.
 	 * I.e. a DER encoded SEQUENCE { r INTEGER, s INTEGER }
 	 * @param signature
 	 * @return
 	 * @throws IOException
 	 */
public static BigInteger[] decodeToBigIntegerArray(byte[] signature) throws IOException {
	ASN1InputStream decoder = new ASN1InputStream(signature);
	DLSequence seq = (DLSequence) decoder.readObject();
	ASN1Integer r = (ASN1Integer) seq.getObjectAt(0);
	ASN1Integer s = (ASN1Integer) seq.getObjectAt(1);
	decoder.close();
	BigInteger[] ret = new BigInteger[2];
	ret[0] = r.getPositiveValue();
	ret[1] = s.getPositiveValue();
	return ret;
}