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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 | +} | |