Examples with DSAPublicKeyParameters org.bouncycastle.crypto.params.DSAPublicKeyParameters used on opensource projects

Example 1 with DSAPublicKeyParameters

use of org.bouncycastle.crypto.params.DSAPublicKeyParameters in project XobotOS by xamarin.

the class DSAKeyPairGenerator method generateKeyPair.

public AsymmetricCipherKeyPair generateKeyPair() {
    DSAParameters dsaParams = param.getParameters();
    BigInteger x = generatePrivateKey(dsaParams.getQ(), param.getRandom());
    BigInteger y = calculatePublicKey(dsaParams.getP(), dsaParams.getG(), x);
    return new AsymmetricCipherKeyPair(new DSAPublicKeyParameters(y, dsaParams), new DSAPrivateKeyParameters(x, dsaParams));
}

Example 2 with DSAPublicKeyParameters

use of org.bouncycastle.crypto.params.DSAPublicKeyParameters in project XobotOS by xamarin.

the class DSASigner method verifySignature.

/**
     * return true if the value r and s represent a DSA signature for
     * the passed in message for standard DSA the message should be a
     * SHA-1 hash of the real message to be verified.
     */
public boolean verifySignature(byte[] message, BigInteger r, BigInteger s) {
    DSAParameters params = key.getParameters();
    BigInteger m = calculateE(params.getQ(), message);
    BigInteger zero = BigInteger.valueOf(0);
    if (zero.compareTo(r) >= 0 || params.getQ().compareTo(r) <= 0) {
        return false;
    }
    if (zero.compareTo(s) >= 0 || params.getQ().compareTo(s) <= 0) {
        return false;
    }
    BigInteger w = s.modInverse(params.getQ());
    BigInteger u1 = m.multiply(w).mod(params.getQ());
    BigInteger u2 = r.multiply(w).mod(params.getQ());
    u1 = params.getG().modPow(u1, params.getP());
    u2 = ((DSAPublicKeyParameters) key).getY().modPow(u2, params.getP());
    BigInteger v = u1.multiply(u2).mod(params.getP()).mod(params.getQ());
    return v.equals(r);
}

Example 3 with DSAPublicKeyParameters

use of org.bouncycastle.crypto.params.DSAPublicKeyParameters in project Skein3Fish by wernerd.

the class DSASigner method verifySignature.

/**
     * return true if the value r and s represent a DSA signature for
     * the passed in message for standard DSA the message should be a
     * SHA-1 hash of the real message to be verified.
     */
public boolean verifySignature(byte[] message, BigInteger r, BigInteger s) {
    DSAParameters params = key.getParameters();
    BigInteger m = calculateE(params.getQ(), message);
    BigInteger zero = BigInteger.valueOf(0);
    if (zero.compareTo(r) >= 0 || params.getQ().compareTo(r) <= 0) {
        return false;
    }
    if (zero.compareTo(s) >= 0 || params.getQ().compareTo(s) <= 0) {
        return false;
    }
    BigInteger w = s.modInverse(params.getQ());
    BigInteger u1 = m.multiply(w).mod(params.getQ());
    BigInteger u2 = r.multiply(w).mod(params.getQ());
    u1 = params.getG().modPow(u1, params.getP());
    u2 = ((DSAPublicKeyParameters) key).getY().modPow(u2, params.getP());
    BigInteger v = u1.multiply(u2).mod(params.getP()).mod(params.getQ());
    return v.equals(r);
}

Example 4 with DSAPublicKeyParameters

use of org.bouncycastle.crypto.params.DSAPublicKeyParameters in project robovm by robovm.

the class KeyPairGeneratorSpi method generateKeyPair.

public KeyPair generateKeyPair() {
    if (!initialised) {
        DSAParametersGenerator pGen = new DSAParametersGenerator();
        pGen.init(strength, certainty, random);
        param = new DSAKeyGenerationParameters(random, pGen.generateParameters());
        engine.init(param);
        initialised = true;
    }
    AsymmetricCipherKeyPair pair = engine.generateKeyPair();
    DSAPublicKeyParameters pub = (DSAPublicKeyParameters) pair.getPublic();
    DSAPrivateKeyParameters priv = (DSAPrivateKeyParameters) pair.getPrivate();
    return new KeyPair(new BCDSAPublicKey(pub), new BCDSAPrivateKey(priv));
}

Example 5 with DSAPublicKeyParameters

use of org.bouncycastle.crypto.params.DSAPublicKeyParameters in project robovm by robovm.

the class PublicKeyFactory method createKey.

/**
     * Create a public key from the passed in SubjectPublicKeyInfo
     * 
     * @param keyInfo the SubjectPublicKeyInfo containing the key data
     * @return the appropriate key parameter
     * @throws IOException on an error decoding the key
     */
public static AsymmetricKeyParameter createKey(SubjectPublicKeyInfo keyInfo) throws IOException {
    AlgorithmIdentifier algId = keyInfo.getAlgorithm();
    if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.rsaEncryption) || algId.getAlgorithm().equals(X509ObjectIdentifiers.id_ea_rsa)) {
        RSAPublicKey pubKey = RSAPublicKey.getInstance(keyInfo.parsePublicKey());
        return new RSAKeyParameters(false, pubKey.getModulus(), pubKey.getPublicExponent());
    } else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.dhpublicnumber)) {
        DHPublicKey dhPublicKey = DHPublicKey.getInstance(keyInfo.parsePublicKey());
        BigInteger y = dhPublicKey.getY().getValue();
        DHDomainParameters dhParams = DHDomainParameters.getInstance(algId.getParameters());
        BigInteger p = dhParams.getP().getValue();
        BigInteger g = dhParams.getG().getValue();
        BigInteger q = dhParams.getQ().getValue();
        BigInteger j = null;
        if (dhParams.getJ() != null) {
            j = dhParams.getJ().getValue();
        }
        DHValidationParameters validation = null;
        DHValidationParms dhValidationParms = dhParams.getValidationParms();
        if (dhValidationParms != null) {
            byte[] seed = dhValidationParms.getSeed().getBytes();
            BigInteger pgenCounter = dhValidationParms.getPgenCounter().getValue();
            // TODO Check pgenCounter size?
            validation = new DHValidationParameters(seed, pgenCounter.intValue());
        }
        return new DHPublicKeyParameters(y, new DHParameters(p, g, q, j, validation));
    } else if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.dhKeyAgreement)) {
        DHParameter params = DHParameter.getInstance(algId.getParameters());
        ASN1Integer derY = (ASN1Integer) keyInfo.parsePublicKey();
        BigInteger lVal = params.getL();
        int l = lVal == null ? 0 : lVal.intValue();
        DHParameters dhParams = new DHParameters(params.getP(), params.getG(), null, l);
        return new DHPublicKeyParameters(derY.getValue(), dhParams);
    } else // END android-removed
    if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_dsa) || algId.getAlgorithm().equals(OIWObjectIdentifiers.dsaWithSHA1)) {
        ASN1Integer derY = (ASN1Integer) keyInfo.parsePublicKey();
        ASN1Encodable de = algId.getParameters();
        DSAParameters parameters = null;
        if (de != null) {
            DSAParameter params = DSAParameter.getInstance(de.toASN1Primitive());
            parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
        }
        return new DSAPublicKeyParameters(derY.getValue(), parameters);
    } else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_ecPublicKey)) {
        X962Parameters params = new X962Parameters((ASN1Primitive) algId.getParameters());
        X9ECParameters x9;
        if (params.isNamedCurve()) {
            ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier) params.getParameters();
            x9 = X962NamedCurves.getByOID(oid);
            if (x9 == null) {
                x9 = SECNamedCurves.getByOID(oid);
                if (x9 == null) {
                    x9 = NISTNamedCurves.getByOID(oid);
                // BEGIN android-removed
                // if (x9 == null)
                // {
                //     x9 = TeleTrusTNamedCurves.getByOID(oid);
                // }
                // END android-removed
                }
            }
        } else {
            x9 = X9ECParameters.getInstance(params.getParameters());
        }
        ASN1OctetString key = new DEROctetString(keyInfo.getPublicKeyData().getBytes());
        X9ECPoint derQ = new X9ECPoint(x9.getCurve(), key);
        // TODO We lose any named parameters here
        ECDomainParameters dParams = new ECDomainParameters(x9.getCurve(), x9.getG(), x9.getN(), x9.getH(), x9.getSeed());
        return new ECPublicKeyParameters(derQ.getPoint(), dParams);
    } else {
        throw new RuntimeException("algorithm identifier in key not recognised");
    }
}