Examples of java.security.spec.PSSParameterSpec

java.security.spec.PSSParameterSpec

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

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

 RSASSA-PSS-params ::= SEQUENCE { hashAlgorithm      [0] OAEP-PSSDigestAlgorithms  DEFAULT sha1, maskGenAlgorithm   [1] PKCS1MGFAlgorithms  DEFAULT mgf1SHA1, saltLength         [2] INTEGER  DEFAULT 20, trailerField       [3] INTEGER  DEFAULT 1 }

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 -- } PKCS1MGFAlgorithms    ALGORITHM-IDENTIFIER ::= { { OID id-mgf1 PARAMETERS OAEP-PSSDigestAlgorithms }, ...  -- Allows for future expansion -- }

Note: the PSSParameterSpec.DEFAULT uses the following: message digest -- "SHA-1" mask generation function (mgf) -- "MGF1" parameters for mgf -- MGF1ParameterSpec.SHA1 SaltLength -- 20 TrailerField -- 1 @see MGF1ParameterSpec @see AlgorithmParameterSpec @see java.security.Signature @author Valerie Peng @version 1.9 06/07/20 @since 1.4

    /**
     * Test for <code>getMGFAlgorithm()</code> method
     * Assertion: returns mask generation function algorithm name 
     */
    public final void testGetMGFAlgorithm() {
        PSSParameterSpec pssps = new PSSParameterSpec("SHA-1", "MGF1",
                MGF1ParameterSpec.SHA1, 20, 1);
        assertEquals("MGF1", pssps.getMGFAlgorithm());
    }

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    /**
     * Test #1 for <code>getMGFParameters()</code> method
     * Assertion: returns mask generation function parameters 
     */
    public final void testGetMGFParameters01() {
        PSSParameterSpec pssps = new PSSParameterSpec("SHA-1", "MGF1",
                MGF1ParameterSpec.SHA1, 20, 1);
        assertTrue(MGF1ParameterSpec.SHA1.equals(pssps.getMGFParameters()));
    }

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     * Assertion: returns <code>null</code>
     * if <code>null</code> had been passed as
     * AlgorithmParameterSpec parameter to the ctor  
     */
    public final void testGetMGFParameters02() {
        PSSParameterSpec pssps = new PSSParameterSpec("SHA-1", "MGF1",
                null, 20, 1);
        assertNull(pssps.getMGFParameters());
    }

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    /**
     * Test for <code>getSaltLength()</code> method<br>
     * Assertion: returns salt length value
     */
    public final void testGetSaltLength() {
        PSSParameterSpec pssps = new PSSParameterSpec(20);
        assertEquals(20, pssps.getSaltLength());
    }

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    /**
     * Test for <code>getTrailerField()</code> method<br>
     * Assertion: returns trailer field value
     */
    public final void testGetTrailerField() {
        PSSParameterSpec pssps = new PSSParameterSpec("SHA-1", "MGF1",
                MGF1ParameterSpec.SHA1, 20, 1);
        assertEquals(1, pssps.getTrailerField());
    }

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    {
        public RsaPssSha256()
        {
            super(AlgorithmIdentifiers.RSA_PSS_USING_SHA256, "SHA256withRSAandMGF1");
            MGF1ParameterSpec mgf1pec = MGF1ParameterSpec.SHA256;
            PSSParameterSpec pssSpec = new PSSParameterSpec(mgf1pec.getDigestAlgorithm(), MGF1, mgf1pec, 32, TRAILER);
            setAlgorithmParameterSpec(pssSpec);
        }

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    {
        public RsaPssSha384()
        {
            super(AlgorithmIdentifiers.RSA_PSS_USING_SHA384, "SHA384withRSAandMGF1");
            MGF1ParameterSpec mgf1pec = MGF1ParameterSpec.SHA384;
            PSSParameterSpec pssSpec = new PSSParameterSpec(mgf1pec.getDigestAlgorithm(), MGF1, mgf1pec, 48, TRAILER);
            setAlgorithmParameterSpec(pssSpec);
        }

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    {
        public RsaPssSha512()
        {
            super(AlgorithmIdentifiers.RSA_PSS_USING_SHA512, "SHA512withRSAandMGF1");
            MGF1ParameterSpec mgf1pec = MGF1ParameterSpec.SHA512;
            PSSParameterSpec pssSpec = new PSSParameterSpec(mgf1pec.getDigestAlgorithm(), MGF1, mgf1pec, 64, TRAILER);
            setAlgorithmParameterSpec(pssSpec);
        }

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         * Return the PKCS#1 ASN.1 structure RSASSA-PSS-params.
         */
        protected byte[] engineGetEncoded() 
            throws IOException
        {
            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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        {
            try
            {
                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());

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