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

Example 46 with DSAParameterSpec

use of java.security.spec.DSAParameterSpec in project xipki by xipki.

the class CaClientExample method generateDsaKeypair.

protected static MyKeypair generateDsaKeypair() throws Exception {
    // plen: 2048, qlen: 256
    DSAParameterSpec spec = new DSAParameterSpec(P2048_Q256_P, P2048_Q256_Q, P2048_Q256_G);
    KeyPairGenerator kpGen = KeyPairGenerator.getInstance("DSA");
    kpGen.initialize(spec);
    KeyPair kp = kpGen.generateKeyPair();
    DSAPublicKey dsaPubKey = (DSAPublicKey) kp.getPublic();
    ASN1EncodableVector vec = new ASN1EncodableVector();
    vec.add(new ASN1Integer(dsaPubKey.getParams().getP()));
    vec.add(new ASN1Integer(dsaPubKey.getParams().getQ()));
    vec.add(new ASN1Integer(dsaPubKey.getParams().getG()));
    ASN1Sequence dssParams = new DERSequence(vec);
    SubjectPublicKeyInfo subjectPublicKeyInfo = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, dssParams), new ASN1Integer(dsaPubKey.getY()));
    return new MyKeypair(kp.getPrivate(), subjectPublicKeyInfo);
}

Example 47 with DSAParameterSpec

use of java.security.spec.DSAParameterSpec in project xipki by xipki.

the class CaClientExample method generateDsaKeypair.

protected static MyKeypair generateDsaKeypair() throws Exception {
    // plen: 2048, qlen: 256
    DSAParameterSpec spec = new DSAParameterSpec(P2048_Q256_P, P2048_Q256_Q, P2048_Q256_G);
    KeyPairGenerator kpGen = KeyPairGenerator.getInstance("DSA");
    kpGen.initialize(spec);
    KeyPair kp = kpGen.generateKeyPair();
    DSAPublicKey dsaPubKey = (DSAPublicKey) kp.getPublic();
    ASN1EncodableVector vec = new ASN1EncodableVector();
    vec.add(new ASN1Integer(dsaPubKey.getParams().getP()));
    vec.add(new ASN1Integer(dsaPubKey.getParams().getQ()));
    vec.add(new ASN1Integer(dsaPubKey.getParams().getG()));
    ASN1Sequence dssParams = new DERSequence(vec);
    SubjectPublicKeyInfo subjectPublicKeyInfo = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, dssParams), new ASN1Integer(dsaPubKey.getY()));
    return new MyKeypair(kp.getPrivate(), subjectPublicKeyInfo);
}

Example 48 with DSAParameterSpec

use of java.security.spec.DSAParameterSpec in project xipki by xipki.

the class DSAParameterCache method getNewDSAParameterSpec.

// CHECKSTYLE:SKIP
public static DSAParameterSpec getNewDSAParameterSpec(int plength, int qlength, SecureRandom random) {
    final int certainty = 80;
    SecureRandom tmpRandom = (random == null) ? new SecureRandom() : random;
    DSAParametersGenerator paramGen = new DSAParametersGenerator(new SHA512Digest());
    DSAParameterGenerationParameters genParams = new DSAParameterGenerationParameters(plength, qlength, certainty, tmpRandom);
    paramGen.init(genParams);
    DSAParameters dsaParams = paramGen.generateParameters();
    return new DSAParameterSpec(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
}

Example 49 with DSAParameterSpec

use of java.security.spec.DSAParameterSpec in project xipki by xipki.

the class DSAParameterCache method addDSAParamSpec.

// CHECKSTYLE:SKIP
private static void addDSAParamSpec(int plen, int qlen, String strP, String strQ, String strG) {
    DSAParameterSpec spec = new DSAParameterSpec(new BigInteger(strP, 16), new BigInteger(strQ, 16), new BigInteger(strG, 16));
    cache.put(plen + "-" + qlen, spec);
}

Example 50 with DSAParameterSpec

use of java.security.spec.DSAParameterSpec in project Bytecoder by mirkosertic.

the class DSAKeyPairGenerator method initialize.

/**
 * Initializes the DSA object using a DSA parameter object.
 *
 * @param params a fully initialized DSA parameter object.
 */
@Override
public void initialize(DSAParams params, SecureRandom random) throws InvalidParameterException {
    if (params == null) {
        throw new InvalidParameterException("Params must not be null");
    }
    DSAParameterSpec spec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
    initialize0(spec, random);
}