Example usage for org.bouncycastle.asn1.pkcs RSAPrivateKeyStructure getPrivateExponent

Introduction

In this page you can find the example usage for org.bouncycastle.asn1.pkcs RSAPrivateKeyStructure getPrivateExponent.

Prototype

public BigInteger getPrivateExponent() 

Source Link

Usage

From source file:edu.syr.bytecast.javadocpublish.ReadPrivateKey.java

License:Open Source License

public void readPrivateKey(String filename) throws Exception {
    List<Byte> bytes = readFileBytes(filename);

    int start_length = "-----BEGIN RSA PRIVATE KEY-----\n".length();
    int end_length = "\n-----END RSA PRIVATE KEY-----".length();
    bytes = bytes.subList(start_length, bytes.size() - end_length);
    String b64encoded = "";
    for (Byte value : bytes) {
        b64encoded += (char) value.byteValue();
    }/*from www.  ja v  a2  s  .  co  m*/
    byte[] asn1PrivateKeyBytes = org.apache.commons.codec.binary.Base64
            .decodeBase64(b64encoded.getBytes("US-ASCII"));
    RSAPrivateKeyStructure asn1PrivKey = new RSAPrivateKeyStructure(
            (ASN1Sequence) ASN1Sequence.fromByteArray(asn1PrivateKeyBytes));
    RSAPrivateKeySpec rsaPrivKeySpec = new RSAPrivateKeySpec(asn1PrivKey.getModulus(),
            asn1PrivKey.getPrivateExponent());
    KeyFactory kf = KeyFactory.getInstance("RSA");
    m_privateKey = (RSAPrivateKey) kf.generatePrivate(rsaPrivKeySpec);
}

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From source file:kr.ac.cau.mecs.cass.utils.AccessTokenUtil.java

private static PrivateKey getPrivateKeyPkcs1(byte[] key) {
    try {//from w ww .  j  a  v a 2s.co  m
        RSAPrivateKeyStructure asn1PrivKey = new RSAPrivateKeyStructure(
                (ASN1Sequence) ASN1Sequence.fromByteArray(key));
        RSAPrivateKeySpec rsaPrivKeySpec = new RSAPrivateKeySpec(asn1PrivKey.getModulus(),
                asn1PrivKey.getPrivateExponent());
        KeyFactory kf = KeyFactory.getInstance("RSA");
        PrivateKey privKey = (PrivateKey) kf.generatePrivate(rsaPrivKeySpec);

        return privKey;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

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From source file:net.jradius.client.auth.EAPTLSAuthenticator.java

License:Open Source License

/**
 * Create a private key parameter from the passed in PKCS8 PrivateKeyInfo object.
 * /*from  ww w.j  av a 2  s.c  om*/
 * @param keyInfo the PrivateKeyInfo object containing the key material
 * @return a suitable private key parameter
 * @throws IOException on an error decoding the key
 */
public static AsymmetricKeyParameter createKey(PrivateKeyInfo keyInfo) throws IOException {
    AlgorithmIdentifier algId = keyInfo.getAlgorithmId();

    if (algId.getObjectId().equals(PKCSObjectIdentifiers.rsaEncryption)) {
        RSAPrivateKeyStructure keyStructure = new RSAPrivateKeyStructure(
                (ASN1Sequence) keyInfo.getPrivateKey());

        return new RSAPrivateCrtKeyParameters(keyStructure.getModulus(), keyStructure.getPublicExponent(),
                keyStructure.getPrivateExponent(), keyStructure.getPrime1(), keyStructure.getPrime2(),
                keyStructure.getExponent1(), keyStructure.getExponent2(), keyStructure.getCoefficient());
    } else if (algId.getObjectId().equals(PKCSObjectIdentifiers.dhKeyAgreement)) {
        DHParameter params = new DHParameter((ASN1Sequence) keyInfo.getAlgorithmId().getParameters());
        DERInteger derX = (DERInteger) keyInfo.getPrivateKey();

        BigInteger lVal = params.getL();
        int l = lVal == null ? 0 : lVal.intValue();
        DHParameters dhParams = new DHParameters(params.getP(), params.getG(), null, l);

        return new DHPrivateKeyParameters(derX.getValue(), dhParams);
    } else if (algId.getObjectId().equals(OIWObjectIdentifiers.elGamalAlgorithm)) {
        ElGamalParameter params = new ElGamalParameter((ASN1Sequence) keyInfo.getAlgorithmId().getParameters());
        DERInteger derX = (DERInteger) keyInfo.getPrivateKey();

        return new ElGamalPrivateKeyParameters(derX.getValue(),
                new ElGamalParameters(params.getP(), params.getG()));
    } else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa)) {
        DERInteger derX = (DERInteger) keyInfo.getPrivateKey();
        DEREncodable de = keyInfo.getAlgorithmId().getParameters();

        DSAParameters parameters = null;
        if (de != null) {
            DSAParameter params = DSAParameter.getInstance(de.getDERObject());
            parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
        }

        return new DSAPrivateKeyParameters(derX.getValue(), parameters);
    } else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_ecPublicKey)) {
        X962Parameters params = new X962Parameters((DERObject) keyInfo.getAlgorithmId().getParameters());
        ECDomainParameters dParams = null;

        if (params.isNamedCurve()) {
            DERObjectIdentifier oid = (DERObjectIdentifier) params.getParameters();
            X9ECParameters ecP = X962NamedCurves.getByOID(oid);

            if (ecP == null) {
                ecP = SECNamedCurves.getByOID(oid);

                if (ecP == null) {
                    ecP = NISTNamedCurves.getByOID(oid);

                    if (ecP == null) {
                        ecP = TeleTrusTNamedCurves.getByOID(oid);
                    }
                }
            }

            dParams = new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
        } else {
            X9ECParameters ecP = new X9ECParameters((ASN1Sequence) params.getParameters());
            dParams = new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
        }

        ECPrivateKeyStructure ec = new ECPrivateKeyStructure((ASN1Sequence) keyInfo.getPrivateKey());

        return new ECPrivateKeyParameters(ec.getKey(), dParams);
    } else {
        throw new RuntimeException("algorithm identifier in key not recognised");
    }
}

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From source file:org.jclouds.crypto.pem.PKCS1EncodedPrivateKeySpec.java

License:Apache License

/**
 * Decode PKCS#1 encoded private key into RSAPrivateCrtKeySpec.
 * /*  ww w.  j a  va2 s .  c o  m*/
 * @param keyBytes
 *           Encoded PKCS#1 rsa key.
 */
private void decode(final byte[] keyBytes) throws IOException {
    ASN1Sequence seq = (ASN1Sequence) ASN1Object.fromByteArray(keyBytes);
    RSAPrivateKeyStructure rsa = new RSAPrivateKeyStructure(seq);

    BigInteger mod = rsa.getModulus();
    BigInteger pubExp = rsa.getPublicExponent();
    BigInteger privExp = rsa.getPrivateExponent();
    BigInteger p1 = rsa.getPrime1();
    BigInteger p2 = rsa.getPrime2();
    BigInteger exp1 = rsa.getExponent1();
    BigInteger exp2 = rsa.getExponent2();
    BigInteger crtCoef = rsa.getCoefficient();

    keySpec = new RSAPrivateCrtKeySpec(mod, pubExp, privExp, p1, p2, exp1, exp2, crtCoef);
}

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