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

            if (!(paramSpec.getMGFParameters() instanceof MGF1ParameterSpec))
            {
                throw new InvalidParameterException("unkown MGF parameters");
            }
            
            MGF1ParameterSpec   mgfParams = (MGF1ParameterSpec)paramSpec.getMGFParameters();
            
            if (!JCEDigestUtil.isSameDigest(mgfParams.getDigestAlgorithm(), paramSpec.getDigestAlgorithm()))
            {
                throw new InvalidParameterException("digest algorithm for MGF should be the same as for PSS parameters.");
            }
            
            digest = JCEDigestUtil.getDigest(mgfParams.getDigestAlgorithm());
            
            if (digest == null)
            {
                throw new InvalidParameterException("no match on MGF digest algorithm: "+ mgfParams.getDigestAlgorithm());
            }
            
            this.saltLength = paramSpec.getSaltLength();
            this.trailer = getTrailer(paramSpec.getTrailerField());
        }

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    static public class SHA224withRSA
        extends JDKPSSSigner
    {
        public SHA224withRSA()
        {
            super("SHA224withRSAandMGF1", new RSABlindedEngine(), new PSSParameterSpec("SHA-224", "MGF1", new MGF1ParameterSpec("SHA-224"), 28, 1));
        }

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    static public class SHA256withRSA
        extends JDKPSSSigner
    {
        public SHA256withRSA()
        {
            super("SHA256withRSAandMGF1", new RSABlindedEngine(), new PSSParameterSpec("SHA-256", "MGF1", new MGF1ParameterSpec("SHA-256"), 32, 1));
        }

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    static public class SHA384withRSA
        extends JDKPSSSigner
    {
        public SHA384withRSA()
        {
            super("SHA384withRSAandMGF1", new RSABlindedEngine(), new PSSParameterSpec("SHA-384", "MGF1", new MGF1ParameterSpec("SHA-384"), 48, 1));
        }

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    static public class SHA512withRSA
        extends JDKPSSSigner
    {
        public SHA512withRSA()
        {
            super("SHA512withRSAandMGF1", new RSABlindedEngine(), new PSSParameterSpec("SHA-512", "MGF1", new MGF1ParameterSpec("SHA-512"), 64, 1));
        }

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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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                RSAESOAEPparams oaepP = new RSAESOAEPparams((ASN1Sequence)aIn.readObject());
    
                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)aIn.readObject());
    
                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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            PSource.PSpecified pSource = PSource.PSpecified.DEFAULT;
            if (oaepParams != null) {
                pSource = new PSource.PSpecified(oaepParams);
            }
            
            MGF1ParameterSpec mgfParameterSpec = new MGF1ParameterSpec("SHA-1");
            if (XMLCipher.RSA_OAEP_11.equals(encryptionAlgorithm)) {
                if (EncryptionConstants.MGF1_SHA256.equals(mgfAlgorithm)) {
                    mgfParameterSpec = new MGF1ParameterSpec("SHA-256");
                } else if (EncryptionConstants.MGF1_SHA384.equals(mgfAlgorithm)) {
                    mgfParameterSpec = new MGF1ParameterSpec("SHA-384");
                } else if (EncryptionConstants.MGF1_SHA512.equals(mgfAlgorithm)) {
                    mgfParameterSpec = new MGF1ParameterSpec("SHA-512");
                }
            }
            return new OAEPParameterSpec(jceDigestAlgorithm, "MGF1", mgfParameterSpec, pSource);
        }

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