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

    {


        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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        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(object);
            oos.flush();
            AlgorithmParameters ap = c.getParameters();
            this.encodedParams = (ap == null) ? null : ap.getEncoded();
            this.paramsAlg = (ap == null) ? null : ap.getAlgorithm();
            this.sealAlg = c.getAlgorithm();
            this.encryptedContent = c.doFinal(bos.toByteArray());
        } catch (BadPaddingException e) {
            // should be never thrown because the cipher
            // should be initialized for encryption

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                throws IOException, ClassNotFoundException,
                       NoSuchAlgorithmException, InvalidKeyException {
        try {
            Cipher cipher = Cipher.getInstance(sealAlg);
            if ((paramsAlg != null) && (paramsAlg.length() != 0)) {
                AlgorithmParameters params =
                    AlgorithmParameters.getInstance(paramsAlg);
                params.init(encodedParams);
                cipher.init(Cipher.DECRYPT_MODE, key, params);
            } else {
                cipher.init(Cipher.DECRYPT_MODE, key);
            }
            byte[] serialized = cipher.doFinal(encryptedContent);

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                    Messages.getString("crypto.15")); //$NON-NLS-1$
        }
        try {
            Cipher cipher = Cipher.getInstance(sealAlg, provider);
            if ((paramsAlg != null) && (paramsAlg.length() != 0)) {
                AlgorithmParameters params =
                    AlgorithmParameters.getInstance(paramsAlg);
                params.init(encodedParams);
                cipher.init(Cipher.DECRYPT_MODE, key, params);
            } else {
                cipher.init(Cipher.DECRYPT_MODE, key);
            }
            byte[] serialized = cipher.doFinal(encryptedContent);

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        // algName == oid now
        boolean mappingExists = mapAlgName();
        // algName == name from map oid->name if mapping exists, or
        // algName == oid if mapping does not exist


        AlgorithmParameters aParams = null;
        byte[] params = aId.getParameters();
        if (params != null && !isNullValue(params)) {
            try {
                aParams = AlgorithmParameters.getInstance(algName);
                aParams.init(aId.getParameters());
                if (!mappingExists) {
                    algName = aParams.getAlgorithm();
                }
            } catch (NoSuchAlgorithmException e) {
            }
        }
        algParameters = aParams;

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


            try
            {
                sigParams.init(params.getDERObject().getDEREncoded());
            }
            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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    {


        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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                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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      rnd.nextBytes(iv);
      IvParameterSpec paramSpec = new IvParameterSpec(iv);
      
      cipher = Cipher.getInstance(TRANSFORMATION);
      cipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
      AlgorithmParameters params = AlgorithmParameters.getInstance(CIPHER);
      params.init(paramSpec);
      
      ASN1Primitive sParams = ASN1Primitive.fromByteArray(params.getEncoded("ASN.1"));
      algId = new AlgorithmIdentifier(DES_OID, sParams);
    } catch (GeneralSecurityException e) {
      throw new RuntimeException(e);
    } catch (IOException e) {
      throw new RuntimeException(e);

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            IEKeySpec   c1Key = new IEKeySpec(aPriv, bPub);
            IEKeySpec   c2Key = new IEKeySpec(bPriv, aPub);


            c1.init(Cipher.ENCRYPT_MODE, c1Key);


            AlgorithmParameters param = c1.getParameters();


            c2.init(Cipher.DECRYPT_MODE, c2Key, param);


            byte[] message = Hex.decode("1234567890abcdef");

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