Examples with OAEPEncoding com.github.zhenwei.core.crypto.encodings.OAEPEncoding used on opensource projects

Example 1 with OAEPEncoding

use of com.github.zhenwei.core.crypto.encodings.OAEPEncoding in project LinLong-Java by zhenwei1108.

the class CipherSpi method initFromSpec.

private void initFromSpec(OAEPParameterSpec pSpec) throws NoSuchPaddingException {
    MGF1ParameterSpec mgfParams = (MGF1ParameterSpec) pSpec.getMGFParameters();
    Digest digest = DigestFactory.getDigest(mgfParams.getDigestAlgorithm());
    if (digest == null) {
        throw new NoSuchPaddingException("no match on OAEP constructor for digest algorithm: " + mgfParams.getDigestAlgorithm());
    }
    cipher = new OAEPEncoding(new ElGamalEngine(), digest, ((PSource.PSpecified) pSpec.getPSource()).getValue());
    paramSpec = pSpec;
}

Example 2 with OAEPEncoding

use of com.github.zhenwei.core.crypto.encodings.OAEPEncoding in project LinLong-Java by zhenwei1108.

the class CipherSpi method engineInit.

protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    if (key instanceof DHPublicKey) {
        param = ElGamalUtil.generatePublicKeyParameter((PublicKey) key);
    } else if (key instanceof DHPrivateKey) {
        param = ElGamalUtil.generatePrivateKeyParameter((PrivateKey) key);
    } else {
        throw new InvalidKeyException("unknown key type passed to ElGamal");
    }
    if (params instanceof OAEPParameterSpec) {
        OAEPParameterSpec spec = (OAEPParameterSpec) params;
        paramSpec = params;
        if (!spec.getMGFAlgorithm().equalsIgnoreCase("MGF1") && !spec.getMGFAlgorithm().equals(PKCSObjectIdentifiers.id_mgf1.getId())) {
            throw new InvalidAlgorithmParameterException("unknown mask generation function specified");
        }
        if (!(spec.getMGFParameters() instanceof MGF1ParameterSpec)) {
            throw new InvalidAlgorithmParameterException("unkown MGF parameters");
        }
        Digest digest = DigestFactory.getDigest(spec.getDigestAlgorithm());
        if (digest == null) {
            throw new InvalidAlgorithmParameterException("no match on digest algorithm: " + spec.getDigestAlgorithm());
        }
        MGF1ParameterSpec mgfParams = (MGF1ParameterSpec) spec.getMGFParameters();
        Digest mgfDigest = DigestFactory.getDigest(mgfParams.getDigestAlgorithm());
        if (mgfDigest == null) {
            throw new InvalidAlgorithmParameterException("no match on MGF digest algorithm: " + mgfParams.getDigestAlgorithm());
        }
        cipher = new OAEPEncoding(new ElGamalEngine(), digest, mgfDigest, ((PSource.PSpecified) spec.getPSource()).getValue());
    } else if (params != null) {
        throw new InvalidAlgorithmParameterException("unknown parameter type.");
    }
    if (random != null) {
        param = new ParametersWithRandom(param, random);
    }
    switch(opmode) {
        case javax.crypto.Cipher.ENCRYPT_MODE:
        case javax.crypto.Cipher.WRAP_MODE:
            cipher.init(true, param);
            break;
        case javax.crypto.Cipher.DECRYPT_MODE:
        case javax.crypto.Cipher.UNWRAP_MODE:
            cipher.init(false, param);
            break;
        default:
            throw new InvalidParameterException("unknown opmode " + opmode + " passed to ElGamal");
    }
}

Example 3 with OAEPEncoding

use of com.github.zhenwei.core.crypto.encodings.OAEPEncoding in project LinLong-Java by zhenwei1108.

the class CipherSpi method engineInit.

protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    if (params == null || params instanceof OAEPParameterSpec) {
        if (key instanceof RSAPublicKey) {
            if (privateKeyOnly && opmode == Cipher.ENCRYPT_MODE) {
                throw new InvalidKeyException("mode 1 requires RSAPrivateKey");
            }
            param = RSAUtil.generatePublicKeyParameter((RSAPublicKey) key);
        } else if (key instanceof RSAPrivateKey) {
            if (publicKeyOnly && opmode == Cipher.ENCRYPT_MODE) {
                throw new InvalidKeyException("mode 2 requires RSAPublicKey");
            }
            param = RSAUtil.generatePrivateKeyParameter((RSAPrivateKey) key);
        } else {
            throw new InvalidKeyException("unknown key type passed to RSA");
        }
        if (params != null) {
            OAEPParameterSpec spec = (OAEPParameterSpec) params;
            paramSpec = params;
            if (!spec.getMGFAlgorithm().equalsIgnoreCase("MGF1") && !spec.getMGFAlgorithm().equals(PKCSObjectIdentifiers.id_mgf1.getId())) {
                throw new InvalidAlgorithmParameterException("unknown mask generation function specified");
            }
            if (!(spec.getMGFParameters() instanceof MGF1ParameterSpec)) {
                throw new InvalidAlgorithmParameterException("unkown MGF parameters");
            }
            Digest digest = DigestFactory.getDigest(spec.getDigestAlgorithm());
            if (digest == null) {
                throw new InvalidAlgorithmParameterException("no match on digest algorithm: " + spec.getDigestAlgorithm());
            }
            MGF1ParameterSpec mgfParams = (MGF1ParameterSpec) spec.getMGFParameters();
            Digest mgfDigest = DigestFactory.getDigest(mgfParams.getDigestAlgorithm());
            if (mgfDigest == null) {
                throw new InvalidAlgorithmParameterException("no match on MGF digest algorithm: " + mgfParams.getDigestAlgorithm());
            }
            cipher = new OAEPEncoding(new RSABlindedEngine(), digest, mgfDigest, ((PSource.PSpecified) spec.getPSource()).getValue());
        }
    } else {
        throw new InvalidAlgorithmParameterException("unknown parameter type: " + params.getClass().getName());
    }
    if (!(cipher instanceof RSABlindedEngine)) {
        if (random != null) {
            param = new ParametersWithRandom(param, random);
        } else {
            param = new ParametersWithRandom(param, CryptoServicesRegistrar.getSecureRandom());
        }
    }
    bOut.reset();
    switch(opmode) {
        case Cipher.ENCRYPT_MODE:
        case Cipher.WRAP_MODE:
            cipher.init(true, param);
            break;
        case Cipher.DECRYPT_MODE:
        case Cipher.UNWRAP_MODE:
            cipher.init(false, param);
            break;
        default:
            throw new InvalidParameterException("unknown opmode " + opmode + " passed to RSA");
    }
}

Example 4 with OAEPEncoding

use of com.github.zhenwei.core.crypto.encodings.OAEPEncoding in project LinLong-Java by zhenwei1108.

the class CipherSpi method initFromSpec.

private void initFromSpec(OAEPParameterSpec pSpec) throws NoSuchPaddingException {
    MGF1ParameterSpec mgfParams = (MGF1ParameterSpec) pSpec.getMGFParameters();
    Digest digest = DigestFactory.getDigest(mgfParams.getDigestAlgorithm());
    if (digest == null) {
        throw new NoSuchPaddingException("no match on OAEP constructor for digest algorithm: " + mgfParams.getDigestAlgorithm());
    }
    cipher = new OAEPEncoding(new RSABlindedEngine(), digest, ((PSource.PSpecified) pSpec.getPSource()).getValue());
    paramSpec = pSpec;
}