Examples of java.security.AlgorithmParameters

java.security.AlgorithmParameters
This class is used as an opaque representation of cryptographic parameters.
An AlgorithmParameters object for managing the parameters for a particular algorithm can be obtained by calling one of the getInstance factory methods (static methods that return instances of a given class).
Once an AlgorithmParameters object is obtained, it must be initialized via a call to init, using an appropriate parameter specification or parameter encoding.
A transparent parameter specification is obtained from an AlgorithmParameters object via a call to getParameterSpec, and a byte encoding of the parameters is obtained via a call to getEncoded. @author Jan Luehe @version 1.27, 04/21/06 @see java.security.spec.AlgorithmParameterSpec @see java.security.spec.DSAParameterSpec @see KeyPairGenerator @since 1.2

        pGen.init(strength, 20, new SecureRandom());
      }


            DHParameters                p = pGen.generateParameters();


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("DH", "BC");
                params.init(new DHParameterSpec(p.getP(), p.getG(), l));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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        pGen.init(strength, 20, new SecureRandom());
      }


            DSAParameters p = pGen.generateParameters();


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("DSA", "BC");
                params.init(new DSAParameterSpec(p.getP(), p.getQ(), p.getG()));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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        pGen.init(strength, 20, new SecureRandom());
      }


            ElGamalParameters p = pGen.generateParameters();


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("ElGamal", "BC");
                params.init(new ElGamalParameterSpec(p.getP(), p.getG()));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
      }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("DES", "BC");
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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            throw new InvalidAlgorithmParameterException("No supported AlgorithmParameterSpec for RC2 parameter generation.");
        }


        protected AlgorithmParameters engineGenerateParameters()
        {
            AlgorithmParameters params;


            if (spec == null)
            {
                byte[]  iv = new byte[8];


                if (random == null)
                {
                    random = new SecureRandom();
                }


                random.nextBytes(iv);


                try
                {
                    params = AlgorithmParameters.getInstance("RC2", "BC");
                    params.init(new IvParameterSpec(iv));
                }
                catch (Exception e)
                {
                    throw new RuntimeException(e.getMessage());
                }
            }
            else
            {
                try
                {
                    params = AlgorithmParameters.getInstance("RC2", "BC");
                    params.init(spec);
                }
                catch (Exception e)
                {
                    throw new RuntimeException(e.getMessage());
                }

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                random = new SecureRandom();
      }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("AES", "BC");
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
      }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("IDEA", "BC");
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
      }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("CAST5", "BC");
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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    {
        
        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);
        SecretKey secretkey = keygenerator.generateKey();

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        }


        private static String getCurveName(ECParameterSpec spec)
            throws GeneralSecurityException
        {
            AlgorithmParameters ap = AlgorithmParameters.getInstance("EC");
            ap.init(spec);
            ECGenParameterSpec nameSpec =
                ap.getParameterSpec(ECGenParameterSpec.class);
            if (nameSpec == null) {
                return null;
            }
            return nameSpec.getName();
        }

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