Examples with RSAPrivateKeySpec java.security.spec.RSAPrivateKeySpec used on opensource projects

Example 76 with RSAPrivateKeySpec

use of java.security.spec.RSAPrivateKeySpec in project santuario-java by apache.

the class TestUtils method getPrivateKey.

public static PrivateKey getPrivateKey(String algo, int keysize) throws InvalidKeySpecException, NoSuchAlgorithmException {
    KeyFactory kf = KeyFactory.getInstance(algo);
    KeySpec kspec;
    if (algo.equalsIgnoreCase("DSA")) {
        if (keysize == 1024) {
            kspec = new DSAPrivateKeySpec(new BigInteger(DSA_X), new BigInteger(DSA_P), new BigInteger(DSA_Q), new BigInteger(DSA_G));
        } else if (keysize == 2048) {
            kspec = new DSAPrivateKeySpec(new BigInteger(DSA_2048_X), new BigInteger(DSA_2048_P), new BigInteger(DSA_2048_Q), new BigInteger(DSA_2048_G));
        } else {
            throw new RuntimeException("Unsupported keysize:" + keysize);
        }
    } else if (algo.equalsIgnoreCase("RSA")) {
        if (keysize == 512) {
            kspec = new RSAPrivateKeySpec(new BigInteger(RSA_MOD), new BigInteger(RSA_PRIV));
        } else {
            throw new RuntimeException("Unsupported keysize:" + keysize);
        }
    } else {
        throw new RuntimeException("Unsupported key algorithm " + algo);
    }
    return kf.generatePrivate(kspec);
}

Example 77 with RSAPrivateKeySpec

use of java.security.spec.RSAPrivateKeySpec in project i2p.i2p by i2p.

the class SigUtil method toJavaRSAKey.

/**
 *  As of 0.9.31, if pk is a RSASigningPrivateCrtKey,
 *  this will return a RSAPrivateCrtKey.
 */
public static RSAPrivateKey toJavaRSAKey(SigningPrivateKey pk) throws GeneralSecurityException {
    if (pk instanceof RSASigningPrivateCrtKey)
        return ((RSASigningPrivateCrtKey) pk).toJavaKey();
    KeyFactory kf = KeyFactory.getInstance("RSA");
    // private key is modulus (pubkey) + exponent
    BigInteger[] nd = split(pk.getData());
    // modulus exponent
    KeySpec ks = new RSAPrivateKeySpec(nd[0], nd[1]);
    return (RSAPrivateKey) kf.generatePrivate(ks);
}

Example 78 with RSAPrivateKeySpec

use of java.security.spec.RSAPrivateKeySpec in project druid by alibaba.

the class ConfigTools method decrypt.

public static String decrypt(PublicKey publicKey, String cipherText) throws Exception {
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    try {
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
    } catch (InvalidKeyException e) {
        // 因为 IBM JDK 不支持私钥加密, 公钥解密, 所以要反转公私钥
        // 也就是说对于解密, 可以通过公钥的参数伪造一个私钥对象欺骗 IBM JDK
        RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
        RSAPrivateKeySpec spec = new RSAPrivateKeySpec(rsaPublicKey.getModulus(), rsaPublicKey.getPublicExponent());
        Key fakePrivateKey = KeyFactory.getInstance("RSA").generatePrivate(spec);
        // It is a stateful object. so we need to get new one.
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, fakePrivateKey);
    }
    if (cipherText == null || cipherText.length() == 0) {
        return cipherText;
    }
    byte[] cipherBytes = Base64.base64ToByteArray(cipherText);
    byte[] plainBytes = cipher.doFinal(cipherBytes);
    return new String(plainBytes);
}