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

        }


        private static ECParameterSpec getECParameterSpec(String name)
            throws GeneralSecurityException
        {
            AlgorithmParameters ap = AlgorithmParameters.getInstance("EC");
            ap.init(new ECGenParameterSpec(name));
            return ap.getParameterSpec(ECParameterSpec.class);
        }

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            NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeySpecException, InvalidParameterSpecException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] salt = new byte[9];
        random.nextBytes(salt);
        cipher.init(Cipher.ENCRYPT_MODE, getCiperKey(salt));
        AlgorithmParameters params = cipher.getParameters();
        List<String> encrypted = new ArrayList<String>();
        encrypted.add(new String(Base64.encodeBase64(salt)));
        encrypted.add(new String(Base64.encodeBase64(params.getParameterSpec(IvParameterSpec.class).getIV())));
        encrypted.add(new String(Base64.encodeBase64(cipher.doFinal(payload.getBytes("UTF-8")))));
        return encrypted;
    }

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


        byte[] encodeParams = params.getEncoded();


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


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


        if (!areEqual(encodeParams, encodeParams_2))
        {
            fail("encode/decode parameters failed");
        }

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        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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        if (!areEqual(out, input))
        {
            fail("OAEP test failed on decrypt expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
        }
        
        AlgorithmParameters oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), 
                new RSAESOAEPparams(
                        new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE), 
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE)),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(new byte[0]))).getEncoded()))
        {
            fail("OAEP test failed default sha-1 parameters");
        }
        
        //
        // OAEP - SHA224
        //
        c = Cipher.getInstance("RSA/NONE/OAEPWithSHA224AndMGF1Padding", "BC");


        c.init(Cipher.ENCRYPT_MODE, pub2048Key, rand);


        out = c.doFinal(input);


        if (!areEqual(out, output[3]))
        {
            fail("OAEP SHA-224 test failed on encrypt expected " + new String(Hex.encode(output[2])) + " got " + new String(Hex.encode(out)));
        }


        c.init(Cipher.DECRYPT_MODE, priv2048Key);


        out = c.doFinal(out);


        if (!areEqual(out, input))
        {
            fail("OAEP SHA-224 test failed on decrypt expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
        }
        
        oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), 
                new RSAESOAEPparams(
                        new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha224, DERNull.INSTANCE), 
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha224, DERNull.INSTANCE)),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(new byte[0]))).getEncoded()))
        {
            fail("OAEP test failed default sha-224 parameters");
        }
        
        //
        // OAEP - SHA 256
        //
        c = Cipher.getInstance("RSA/NONE/OAEPWithSHA256AndMGF1Padding", "BC");


        c.init(Cipher.ENCRYPT_MODE, pub2048Key, rand);


        out = c.doFinal(input);


        if (!areEqual(out, output[4]))
        {
            fail("OAEP SHA-256 test failed on encrypt expected " + new String(Hex.encode(output[2])) + " got " + new String(Hex.encode(out)));
        }


        c.init(Cipher.DECRYPT_MODE, priv2048Key);


        out = c.doFinal(out);


        if (!areEqual(out, input))
        {
            fail("OAEP SHA-256 test failed on decrypt expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
        }
        
        oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), 
                new RSAESOAEPparams(
                        new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256, DERNull.INSTANCE), 
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256, DERNull.INSTANCE)),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(new byte[0]))).getEncoded()))
        {
            fail("OAEP test failed default sha-256 parameters");
        }
        
        //
        // OAEP - SHA 384
        //
        c = Cipher.getInstance("RSA/NONE/OAEPWithSHA384AndMGF1Padding", "BC");


        c.init(Cipher.ENCRYPT_MODE, pub2048Key, rand);


        out = c.doFinal(input);


        if (!areEqual(out, output[5]))
        {
            fail("OAEP SHA-384 test failed on encrypt expected " + new String(Hex.encode(output[2])) + " got " + new String(Hex.encode(out)));
        }


        c.init(Cipher.DECRYPT_MODE, priv2048Key);


        out = c.doFinal(out);


        if (!areEqual(out, input))
        {
            fail("OAEP SHA-384 test failed on decrypt expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
        }
        
        oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), 
                new RSAESOAEPparams(
                        new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha384, DERNull.INSTANCE), 
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha384, DERNull.INSTANCE)),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(new byte[0]))).getEncoded()))
        {
            fail("OAEP test failed default sha-384 parameters");
        }
        
        //
        // OAEP - MD5
        //
        c = Cipher.getInstance("RSA/NONE/OAEPWithMD5AndMGF1Padding", "BC");


        c.init(Cipher.ENCRYPT_MODE, pubKey, rand);


        out = c.doFinal(input);


        if (!areEqual(out, output[6]))
        {
            fail("OAEP MD5 test failed on encrypt expected " + new String(Hex.encode(output[2])) + " got " + new String(Hex.encode(out)));
        }


        c.init(Cipher.DECRYPT_MODE, privKey);


        out = c.doFinal(out);


        if (!areEqual(out, input))
        {
            fail("OAEP MD5 test failed on decrypt expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
        }
        
        oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), 
                new RSAESOAEPparams(
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.md5, DERNull.INSTANCE), 
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, new AlgorithmIdentifier(PKCSObjectIdentifiers.md5, DERNull.INSTANCE)),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(new byte[0]))).getEncoded()))
        {
            fail("OAEP test failed default md5 parameters");
        }
        
        //
        // OAEP - SHA1 with default parameters
        //
        c = Cipher.getInstance("RSA/NONE/OAEPPadding", "BC");


        c.init(Cipher.ENCRYPT_MODE, pubKey, OAEPParameterSpec.DEFAULT, rand);


        out = c.doFinal(input);


        if (!areEqual(out, output[2]))
        {
            fail("OAEP test failed on encrypt expected " + new String(Hex.encode(output[2])) + " got " + new String(Hex.encode(out)));
        }


        c = Cipher.getInstance("RSA/NONE/OAEPWithSHA1AndMGF1Padding", "BC");
        
        c.init(Cipher.DECRYPT_MODE, privKey);


        out = c.doFinal(out);
        
        if (!areEqual(out, input))
        {
            fail("OAEP test failed on decrypt expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
        }
        
        oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), new byte[] { 0x30, 0x00 }))
        {
            fail("OAEP test failed default parameters");
        }


        //
        // OAEP - SHA1 with specified string
        //
        c = Cipher.getInstance("RSA/NONE/OAEPPadding", "BC");


        c.init(Cipher.ENCRYPT_MODE, pubKey, new OAEPParameterSpec("SHA1", "MGF1", new MGF1ParameterSpec("SHA1"), new PSource.PSpecified(new byte[] { 1, 2, 3, 4, 5 })), rand);


        out = c.doFinal(input);


        oaepP = c.getParameters();
        
        if (!areEqual(oaepP.getEncoded(), 
                new RSAESOAEPparams(
                        new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE), 
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE)),
                        new AlgorithmIdentifier(PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(new byte[] { 1, 2, 3, 4, 5 }))).getEncoded()))
        {

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        if (!s.verify(sig1a))
        {
            fail("SHA1 signature verification with default parameters failed");
        }
        
        AlgorithmParameters pss = s.getParameters();
        if (!arrayEquals(pss.getEncoded(), new byte[] { 0x30, 0x00 }))
        {
            fail("failed default encoding test.");
        }
        
        s = Signature.getInstance("SHA256withRSA/PSS", "BC");


        s.initSign(privKey, new FixedRandom(slt1a));
        s.update(msg1a);
        sig = s.sign();


        pss = s.getParameters();
        
        if (!arrayEquals(sig1b, sig))
        {
            fail("PSS Sign test expected " + new String(Hex.encode(sig1b)) + " got " + new String(Hex.encode(sig)));
        }


        s = Signature.getInstance("SHA256withRSAandMGF1", "BC");
        
        s.setParameter(pss.getParameterSpec(PSSParameterSpec.class));
        
        s.initVerify(pubKey);
        s.update(msg1a);
        if (!s.verify(sig1b))
        {
            fail("SHA256 signature verification failed");
        }


        //
        // 512 test -with zero salt length
        //
        s = Signature.getInstance("SHA512withRSAandMGF1", "BC");
        
        s.setParameter(new PSSParameterSpec("SHA-512", "MGF1", new MGF1ParameterSpec("SHA-512"), 0, 1));
        s.initSign(privKey);


        s.update(msg1a);
        sig = s.sign();


        pss = s.getParameters();
        
        if (!arrayEquals(sig1c, sig))
        {
            fail("PSS Sign test expected " + new String(Hex.encode(sig1c)) + " got " + new String(Hex.encode(sig)));
        }


        s = Signature.getInstance("SHA512withRSAandMGF1", "BC");
        
        s.setParameter(pss.getParameterSpec(PSSParameterSpec.class));
        
        s.initVerify(pubKey);
        s.update(msg1a);
        if (!s.verify(sig1c))
        {

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            fail("unexpected exception.", e);
        }


        try
        {
            AlgorithmParameters algParams = AlgorithmParameters.getInstance("DES", "BC");
            
            algParams.init(new IvParameterSpec(new byte[8]));


            // According specification engineGetEncoded() returns
            // the parameters in their primary encoding format. The primary
            // encoding
            // format for parameters is ASN.1, if an ASN.1 specification for
            // this type
            // of parameters exists.
            byte[] iv = algParams.getEncoded();
            
            if (iv.length != 10)
            {
                fail("parameters encoding wrong length - "  + iv.length);
            }
        }
        catch (Exception e)
        {
            fail("unexpected exception.", e);
        }


        try
        {
            try
            {
                AlgorithmParameters algParams = AlgorithmParameters.getInstance("DES", "BC");
    
                byte[] encoding = new byte[10];
                encoding[0] = 3;
                encoding[1] = 8;
    
                // According specification engineInit(byte[] params, String format)
                // throws
                // IOException on decoding errors, but BC throws ClassCastException.
                algParams.init(encoding, "ASN.1");
    
                fail("failed exception test - no IOException thrown");
            }
            catch (IOException e)
            {

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("RC6", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            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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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


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

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