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

        ASN1Encodable params)
        throws NoSuchAlgorithmException, SignatureException, InvalidKeyException
    {
        if (params != null && !derNull.equals(params))
        {
            AlgorithmParameters  sigParams = AlgorithmParameters.getInstance(signature.getAlgorithm(), signature.getProvider());
            
            try
            {
                sigParams.init(params.toASN1Primitive().getEncoded());
            }
            catch (IOException e)
            {
                throw new SignatureException("IOException decoding parameters: " + e.getMessage());
            }
            
            if (signature.getAlgorithm().endsWith("MGF1"))
            {
                try
                {
                    signature.setParameter(sigParams.getParameterSpec(PSSParameterSpec.class));
                }
                catch (GeneralSecurityException e)
                {
                    throw new SignatureException("Exception extracting parameters: " + e.getMessage());
                }

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


        ElGamalParameters p = pGen.generateParameters();


        AlgorithmParameters params;


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

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        {
            if (pbeSpec != null)
            {
                try
                {
                    AlgorithmParameters engineParams = AlgorithmParameters.getInstance(pbeAlgorithm, BouncyCastleProvider.PROVIDER_NAME);
                    engineParams.init(pbeSpec);
                    
                    return engineParams;
                }
                catch (Exception e)
                {

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        ASN1Encodable params)
        throws NoSuchAlgorithmException, SignatureException, InvalidKeyException
    {
        if (params != null && !DERNull.INSTANCE.equals(params))
        {
            AlgorithmParameters sigParams = AlgorithmParameters.getInstance(signature.getAlgorithm(), signature.getProvider());


            try
            {
                sigParams.init(params.toASN1Primitive().getEncoded(ASN1Encoding.DER));
            }
            catch (IOException e)
            {
                throw new SignatureException("IOException decoding parameters: " + e.getMessage());
            }


            if (signature.getAlgorithm().endsWith("MGF1"))
            {
                try
                {
                    signature.setParameter(sigParams.getParameterSpec(PSSParameterSpec.class));
                }
                catch (GeneralSecurityException e)
                {
                    throw new SignatureException("Exception extracting parameters: " + e.getMessage());
                }

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        int         size)
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("ElGamal", "BC");
        a.init(size, new SecureRandom());
        AlgorithmParameters params = a.generateParameters();


        byte[] encodeParams = params.getEncoded();


        AlgorithmParameters a2 = AlgorithmParameters.getInstance("ElGamal", "BC");
        a2.init(encodeParams);


        // a and a2 should be equivalent!
        byte[] encodeParams_2 = a2.getEncoded();


        if (!areEqual(encodeParams, encodeParams_2))
        {
            fail(this.getName() + ": encode/decode parameters failed");
        }

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


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

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            pGen.init(strength, 20, random);
        }


        DSAParameters p = pGen.generateParameters();


        AlgorithmParameters params;


        try
        {
            params = AlgorithmParameters.getInstance("DSA", BouncyCastleProvider.PROVIDER_NAME);
            params.init(new DSAParameterSpec(p.getP(), p.getQ(), 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", BouncyCastleProvider.PROVIDER_NAME);
                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("DES", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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