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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.security.spec; | ||
| 27 | |||
| 28 | import java.security.spec.AlgorithmParameterSpec; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * This class specifies the set of parameters used with mask generation | ||
| 32 | * function MGF1 in OAEP Padding and RSA-PSS signature scheme, as | ||
| 33 | * defined in the | ||
| 34 | * <a href="http://www.ietf.org/rfc/rfc3447.txt">PKCS #1 v2.1</a> | ||
| 35 | * standard. | ||
| 36 | * | ||
| 37 | * <p>Its ASN.1 definition in PKCS#1 standard is described below: | ||
| 38 | * <pre> | ||
| 39 | * MGF1Parameters ::= OAEP-PSSDigestAlgorthms | ||
| 40 | * </pre> | ||
| 41 | * where | ||
| 42 | * <pre> | ||
| 43 | * OAEP-PSSDigestAlgorithms ALGORITHM-IDENTIFIER ::= { | ||
| 44 | * { OID id-sha1 PARAMETERS NULL }| | ||
| 45 | * { OID id-sha256 PARAMETERS NULL }| | ||
| 46 | * { OID id-sha384 PARAMETERS NULL }| | ||
| 47 | * { OID id-sha512 PARAMETERS NULL }, | ||
| 48 | * ... -- Allows for future expansion -- | ||
| 49 | * } | ||
| 50 | * </pre> | ||
| 51 | * @see PSSParameterSpec | ||
| 52 | * @see javax.crypto.spec.OAEPParameterSpec | ||
| 53 | * | ||
| 54 | * @author Valerie Peng | ||
| 55 | * | ||
| 56 | * @since 1.5 | ||
| 57 | */ | ||
| 58 | public class MGF1ParameterSpec implements AlgorithmParameterSpec { | ||
| 59 | |||
| 60 | /** | ||
| 61 | * The MGF1ParameterSpec which uses "SHA-1" message digest. | ||
| 62 | */ | ||
| 63 | public static final MGF1ParameterSpec SHA1 = | ||
| 64 | new MGF1ParameterSpec("SHA-1"); | ||
| 65 | /** | ||
| 66 | * The MGF1ParameterSpec which uses "SHA-256" message digest. | ||
| 67 | */ | ||
| 68 | public static final MGF1ParameterSpec SHA256 = | ||
| 69 | new MGF1ParameterSpec("SHA-256"); | ||
| 70 | /** | ||
| 71 | * The MGF1ParameterSpec which uses "SHA-384" message digest. | ||
| 72 | */ | ||
| 73 | public static final MGF1ParameterSpec SHA384 = | ||
| 74 | new MGF1ParameterSpec("SHA-384"); | ||
| 75 | /** | ||
| 76 | * The MGF1ParameterSpec which uses SHA-512 message digest. | ||
| 77 | */ | ||
| 78 | public static final MGF1ParameterSpec SHA512 = | ||
| 79 | new MGF1ParameterSpec("SHA-512"); | ||
| 80 | |||
| 81 | private String mdName; | ||
| 82 | |||
| 83 | /** | ||
| 84 | * Constructs a parameter set for mask generation function MGF1 | ||
| 85 | * as defined in the PKCS #1 standard. | ||
| 86 | * | ||
| 87 | * @param mdName the algorithm name for the message digest | ||
| 88 | * used in this mask generation function MGF1. | ||
| 89 | * @exception NullPointerException if <code>mdName</code> is null. | ||
| 90 | */ | ||
| 91 | public MGF1ParameterSpec(String mdName) { | ||
| 92 | if (mdName == null) { | ||
| 93 | throw new NullPointerException("digest algorithm is null"); | ||
| 94 | } | ||
| 95 | this.mdName = mdName; | ||
| 96 | } | ||
| 97 | |||
| 98 | /** | ||
| 99 | * Returns the algorithm name of the message digest used by the mask | ||
| 100 | * generation function. | ||
| 101 | * | ||
| 102 | * @return the algorithm name of the message digest. | ||
| 103 | */ | ||
| 104 | public String getDigestAlgorithm() { | ||
| 105 | return mdName; | ||
| 106 | } | ||
| 107 | } | ||