/* * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.security.spec; import java.security.spec.AlgorithmParameterSpec; /** * This class specifies the set of parameters used with mask generation * function MGF1 in OAEP Padding and RSA-PSS signature scheme, as * defined in the * 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 * * @since 1.5 */ public class MGF1ParameterSpec implements AlgorithmParameterSpec { /** * The MGF1ParameterSpec which uses "SHA-1" message digest. */ public static final MGF1ParameterSpec SHA1 = new MGF1ParameterSpec("SHA-1"); /** * The MGF1ParameterSpec which uses "SHA-256" message digest. */ public static final MGF1ParameterSpec SHA256 = new MGF1ParameterSpec("SHA-256"); /** * The MGF1ParameterSpec which uses "SHA-384" message digest. */ public static final MGF1ParameterSpec SHA384 = new MGF1ParameterSpec("SHA-384"); /** * The MGF1ParameterSpec which uses SHA-512 message digest. */ public static final MGF1ParameterSpec SHA512 = new MGF1ParameterSpec("SHA-512"); private String mdName; /** * Constructs a parameter set for mask generation function MGF1 * as defined in the PKCS #1 standard. * * @param mdName the algorithm name for the message digest * used in this mask generation function MGF1. * @exception NullPointerException if mdName is null. */ public MGF1ParameterSpec(String mdName) { if (mdName == null) { throw new NullPointerException("digest algorithm is null"); } this.mdName = mdName; } /** * Returns the algorithm name of the message digest used by the mask * generation function. * * @return the algorithm name of the message digest. */ public String getDigestAlgorithm() { return mdName; } }