Example usage for java.security AlgorithmParameterGenerator generateParameters

Introduction

In this page you can find the example usage for java.security AlgorithmParameterGenerator generateParameters.

Prototype

public final AlgorithmParameters generateParameters() 

Source Link

Document

Generates the parameters.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH");
    paramGen.init(1024);//from   www. j a v  a  2 s . c o  m

    AlgorithmParameters params = paramGen.generateParameters();
    DHParameterSpec dhSpec = (DHParameterSpec) params.getParameterSpec(DHParameterSpec.class);

    System.out.println("" + dhSpec.getP() + "," + dhSpec.getG() + "," + dhSpec.getL());
}

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From source file:SecureConnection.java

public byte[] getPublicKey(int size) throws Exception {
    AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH");
    paramGen.init(size);//  w ww  .jav  a2  s.com
    AlgorithmParameters params = paramGen.generateParameters();
    DHParameterSpec dhParamSpec = (DHParameterSpec) params.getParameterSpec(DHParameterSpec.class);
    return this.getPublicKeyStep2(dhParamSpec);
}

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From source file:hudson.cli.Connection.java

public KeyAgreement diffieHellman(boolean side, int keySize) throws IOException, GeneralSecurityException {
    KeyPair keyPair;/* w w  w.ja  v a  2s  . c o  m*/
    PublicKey otherHalf;

    if (side) {
        AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH");
        paramGen.init(keySize);

        KeyPairGenerator dh = KeyPairGenerator.getInstance("DH");
        dh.initialize(paramGen.generateParameters().getParameterSpec(DHParameterSpec.class));
        keyPair = dh.generateKeyPair();

        // send a half and get a half
        writeKey(keyPair.getPublic());
        otherHalf = KeyFactory.getInstance("DH").generatePublic(readKey());
    } else {
        otherHalf = KeyFactory.getInstance("DH").generatePublic(readKey());

        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DH");
        keyPairGen.initialize(((DHPublicKey) otherHalf).getParams());
        keyPair = keyPairGen.generateKeyPair();

        // send a half and get a half
        writeKey(keyPair.getPublic());
    }

    KeyAgreement ka = KeyAgreement.getInstance("DH");
    ka.init(keyPair.getPrivate());
    ka.doPhase(otherHalf, true);

    return ka;
}

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From source file:org.apache.abdera2.common.security.DHBase.java

private void init() throws NoSuchAlgorithmException, InvalidAlgorithmParameterException,
        InvalidParameterSpecException, InvalidKeySpecException {
    AlgorithmParameterGenerator pgen = AlgorithmParameterGenerator.getInstance("DH");
    pgen.init(512);//from w  w  w.  ja va2 s. c  om
    AlgorithmParameters params = pgen.generateParameters();
    DHParameterSpec dhspec = (DHParameterSpec) params.getParameterSpec(DHParameterSpec.class);
    KeyPairGenerator keypairgen = KeyPairGenerator.getInstance("DH");
    keypairgen.initialize(dhspec);
    keyPair = keypairgen.generateKeyPair();
    p = dhspec.getP();
    g = dhspec.getG();
    l = dhspec.getL();
}

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From source file:org.apache.pdfbox.pdmodel.encryption.PublicKeySecurityHandler.java

private DERObject createDERForRecipient(byte[] in, X509Certificate cert)
        throws IOException, GeneralSecurityException {

    String s = "1.2.840.113549.3.2";

    AlgorithmParameterGenerator algorithmparametergenerator = AlgorithmParameterGenerator.getInstance(s);
    AlgorithmParameters algorithmparameters = algorithmparametergenerator.generateParameters();
    ByteArrayInputStream bytearrayinputstream = new ByteArrayInputStream(
            algorithmparameters.getEncoded("ASN.1"));
    ASN1InputStream asn1inputstream = new ASN1InputStream(bytearrayinputstream);
    DERObject derobject = asn1inputstream.readObject();
    KeyGenerator keygenerator = KeyGenerator.getInstance(s);
    keygenerator.init(128);//  ww w .j a v  a 2s . co  m
    SecretKey secretkey = keygenerator.generateKey();
    Cipher cipher = Cipher.getInstance(s);
    cipher.init(1, secretkey, algorithmparameters);
    byte[] abyte1 = cipher.doFinal(in);
    DEROctetString deroctetstring = new DEROctetString(abyte1);
    KeyTransRecipientInfo keytransrecipientinfo = computeRecipientInfo(cert, secretkey.getEncoded());
    DERSet derset = new DERSet(new RecipientInfo(keytransrecipientinfo));
    AlgorithmIdentifier algorithmidentifier = new AlgorithmIdentifier(new DERObjectIdentifier(s), derobject);
    EncryptedContentInfo encryptedcontentinfo = new EncryptedContentInfo(PKCSObjectIdentifiers.data,
            algorithmidentifier, deroctetstring);
    EnvelopedData env = new EnvelopedData(null, derset, encryptedcontentinfo, null);
    ContentInfo contentinfo = new ContentInfo(PKCSObjectIdentifiers.envelopedData, env);
    return contentinfo.getDERObject();
}

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