1 /* 2 * Copyright (c) 2018, 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 sun.security.util; 27 28 import java.io.IOException; 29 import java.security.*; 30 import java.security.spec.*; 31 import sun.security.rsa.RSAUtil; 32 33 /** 34 * Utility class for Signature related operations. Currently used by various 35 * internal PKI classes such as sun.security.x509.X509CertImpl, 36 * sun.security.pkcs.SignerInfo, for setting signature parameters. 37 * 38 * @since 11 39 */ 40 public class SignatureUtil { 41 42 // Utility method of creating an AlgorithmParameters object with 43 // the specified algorithm name and encoding 44 private static AlgorithmParameters createAlgorithmParameters(String algName, 45 byte[] paramBytes) throws ProviderException { 46 47 try { 48 AlgorithmParameters result = 49 AlgorithmParameters.getInstance(algName); 50 result.init(paramBytes); 51 return result; 52 } catch (NoSuchAlgorithmException | IOException e) { 53 throw new ProviderException(e); 54 } 55 } 56 57 private static AlgorithmParameterSpec getParamSpec(String sigName, 58 AlgorithmParameters params) 59 throws InvalidAlgorithmParameterException, ProviderException { 60 61 if (params == null) return null; 62 63 if (sigName.toUpperCase().indexOf("RSA") == -1) { 64 throw new ProviderException 65 ("Unrecognized algorithm for signature parameters " + 66 sigName); 67 } 68 // AlgorithmParameters.getAlgorithm() may returns oid if it's 69 // created during DER decoding. Convert to use the standard name 70 // before passing it to RSAUtil 71 String alg = params.getAlgorithm(); 72 if (alg.equalsIgnoreCase(sigName) || alg.indexOf(".") != -1) { 73 try { 74 params = createAlgorithmParameters(sigName, 75 params.getEncoded()); 76 } catch (IOException e) { 77 throw new ProviderException(e); 78 } 79 } 80 return RSAUtil.getParamSpec(params); 81 } 82 83 // Special method for setting the specified parameter bytes into the 84 // specified Signature object as signature parameters. 85 public static void specialSetParameter(Signature sig, byte[] paramBytes) 86 throws InvalidAlgorithmParameterException, ProviderException { 87 if (paramBytes != null) { 88 String sigName = sig.getAlgorithm(); 89 AlgorithmParameters params = 90 createAlgorithmParameters(sigName, paramBytes); 91 specialSetParameter(sig, params); 92 } 93 } 94 95 // Special method for setting the specified AlgorithmParameter object 96 // into the specified Signature object as signature parameters. 97 public static void specialSetParameter(Signature sig, 98 AlgorithmParameters params) 99 throws InvalidAlgorithmParameterException, ProviderException { 100 if (params != null) { 101 String sigName = sig.getAlgorithm(); 102 sig.setParameter(getParamSpec(sigName, params)); 103 } 104 } 105 }