Examples of java.security.spec.MGF1ParameterSpec

java.security.spec.MGF1ParameterSpec

etf.org/rfc/rfc3447.txt">PKCS #1 v2.1 standard.

Its ASN.1 definition in PKCS#1 standard is described below:

 MGF1Parameters ::= OAEP-PSSDigestAlgorthms

where

 OAEP-PSSDigestAlgorithms    ALGORITHM-IDENTIFIER ::= { { OID id-sha1 PARAMETERS NULL   }| { OID id-sha256 PARAMETERS NULL }| { OID id-sha384 PARAMETERS NULL }| { OID id-sha512 PARAMETERS NULL }, ...  -- Allows for future expansion -- }

@see PSSParameterSpec @see javax.crypto.spec.OAEPParameterSpec @author Valerie Peng @version 1.5, 07/20/06 @since 1.5

    static public class SHA512withRSA
        extends JDKPSSSigner
    {
        public SHA512withRSA()
        {
            super(new RSABlindedEngine(), new PSSParameterSpec("SHA-512", "MGF1", new MGF1ParameterSpec("SHA-512"), 64, 1));
        }

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        protected byte[] engineGetEncoded() 
        {
            AlgorithmIdentifier     hashAlgorithm = new AlgorithmIdentifier(
                                                            JCEDigestUtil.getOID(currentSpec.getDigestAlgorithm()),
                                                            new DERNull());
            MGF1ParameterSpec       mgfSpec = (MGF1ParameterSpec)currentSpec.getMGFParameters();
            AlgorithmIdentifier     maskGenAlgorithm = new AlgorithmIdentifier(
                                                            PKCSObjectIdentifiers.id_mgf1, 
                                                            new AlgorithmIdentifier(JCEDigestUtil.getOID(mgfSpec.getDigestAlgorithm()), new DERNull()));
            PSource.PSpecified      pSource = (PSource.PSpecified)currentSpec.getPSource();
            AlgorithmIdentifier     pSourceAlgorithm = new AlgorithmIdentifier(
                                                            PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(pSource.getValue()));
            RSAESOAEPparams         oaepP = new RSAESOAEPparams(hashAlgorithm, maskGenAlgorithm, pSourceAlgorithm);

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                RSAESOAEPparams oaepP = new RSAESOAEPparams((ASN1Sequence)ASN1Object.fromByteArray(params));


                currentSpec = new OAEPParameterSpec(
                                       oaepP.getHashAlgorithm().getObjectId().getId(), 
                                       oaepP.getMaskGenAlgorithm().getObjectId().getId(), 
                                       new MGF1ParameterSpec(AlgorithmIdentifier.getInstance(oaepP.getMaskGenAlgorithm().getParameters()).getObjectId().getId()),
                                       new PSource.PSpecified(ASN1OctetString.getInstance(oaepP.getPSourceAlgorithm().getParameters()).getOctets()));
            }
            catch (ClassCastException e)
            {
                throw new IOException("Not a valid OAEP Parameter encoding.");

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        {
            PSSParameterSpec    pssSpec = currentSpec;
            AlgorithmIdentifier hashAlgorithm = new AlgorithmIdentifier(
                                                JCEDigestUtil.getOID(pssSpec.getDigestAlgorithm()),
                                                new DERNull());
            MGF1ParameterSpec   mgfSpec = (MGF1ParameterSpec)pssSpec.getMGFParameters();
            AlgorithmIdentifier maskGenAlgorithm = new AlgorithmIdentifier(
                                                PKCSObjectIdentifiers.id_mgf1, 
                                                new AlgorithmIdentifier(JCEDigestUtil.getOID(mgfSpec.getDigestAlgorithm()), new DERNull()));
            RSASSAPSSparams     pssP = new RSASSAPSSparams(hashAlgorithm, maskGenAlgorithm, new DERInteger(pssSpec.getSaltLength()), new DERInteger(pssSpec.getTrailerField()));
            
            return pssP.getEncoded("DER");
        }

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                RSASSAPSSparams pssP = new RSASSAPSSparams((ASN1Sequence)ASN1Object.fromByteArray(params));


                currentSpec = new PSSParameterSpec(
                                       pssP.getHashAlgorithm().getObjectId().getId(), 
                                       pssP.getMaskGenAlgorithm().getObjectId().getId(), 
                                       new MGF1ParameterSpec(AlgorithmIdentifier.getInstance(pssP.getMaskGenAlgorithm().getParameters()).getObjectId().getId()),
                                       pssP.getSaltLength().getValue().intValue(),
                                       pssP.getTrailerField().getValue().intValue());
            }
            catch (ClassCastException e)
            {

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                        byte[] oaepParams = getSecurityProperties().getEncryptionKeyTransportOAEPParams();
                        if (oaepParams != null) {
                            pSource = new PSource.PSpecified(oaepParams);
                        }


                        MGF1ParameterSpec mgfParameterSpec = new MGF1ParameterSpec("SHA-1");
                        if (encryptionKeyTransportMGFAlgorithm != null) {
                            String jceMGFAlgorithm = JCEAlgorithmMapper.translateURItoJCEID(encryptionKeyTransportMGFAlgorithm);
                            mgfParameterSpec = new MGF1ParameterSpec(jceMGFAlgorithm);
                        }
                        algorithmParameterSpec = new OAEPParameterSpec(jceDigestAlgorithm, "MGF1", mgfParameterSpec, pSource);
                    }


                    cipher.init(Cipher.WRAP_MODE, x509Certificate.getPublicKey(), algorithmParameterSpec);

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     * Test #1 for <code>MGF1ParameterSpec</code> constructor<br>
     * Assertion: constructs new <code>MGF1ParameterSpec</code>
     * object using valid parameter
     */
    public final void testMGF1ParameterSpec01() {
        new MGF1ParameterSpec(testAlgName);
    }

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     * Test #2 for <code>MGF1ParameterSpec</code> constructor<br>
     * Assertion: <code>NullPointerException</code> if parameter is <code>null</code>
     */
    public final void testMGF1ParameterSpec02() {
        try {
            new MGF1ParameterSpec(null);
            fail("NullPointerException has not been thrown");
        } catch (NullPointerException ok) {
        }
    }

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     * Test for <code>getDigestAlgorithm</code> method<br>
     * Assertion: returns the algorithm name of the message
     * digest used by the mask generation function
     */
    public final void testGetDigestAlgorithm() {
        MGF1ParameterSpec aps = new MGF1ParameterSpec(testAlgName);
        assertTrue(testAlgName.equals(aps.getDigestAlgorithm()));
    }

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            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
            DEROutputStream         dOut = new DEROutputStream(bOut);
            AlgorithmIdentifier     hashAlgorithm = new AlgorithmIdentifier(
                                                            JCEDigestUtil.getOID(currentSpec.getDigestAlgorithm()),
                                                            new DERNull());
            MGF1ParameterSpec       mgfSpec = (MGF1ParameterSpec)currentSpec.getMGFParameters();
            AlgorithmIdentifier     maskGenAlgorithm = new AlgorithmIdentifier(
                                                            PKCSObjectIdentifiers.id_mgf1, 
                                                            new AlgorithmIdentifier(JCEDigestUtil.getOID(mgfSpec.getDigestAlgorithm()), new DERNull()));
            PSource.PSpecified      pSource = (PSource.PSpecified)currentSpec.getPSource();
            AlgorithmIdentifier     pSourceAlgorithm = new AlgorithmIdentifier(
                                                            PKCSObjectIdentifiers.id_pSpecified, new DEROctetString(pSource.getValue()));
            RSAESOAEPparams         oaepP = new RSAESOAEPparams(hashAlgorithm, maskGenAlgorithm, pSourceAlgorithm);

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