/*
* 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
* <a href="http://www.ietf.org/rfc/rfc3447.txt">PKCS #1 v2.1</a>
* standard.
*
* <p>Its ASN.1 definition in PKCS#1 standard is described below:
* <pre>
* MGF1Parameters ::= OAEP-PSSDigestAlgorthms
* </pre>
* where
* <pre>
* 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 --
* }
* </pre>
* @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 <code>mdName</code> 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;
}
}