| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | /**************************************************************************** |
| 20 | * Copyright (c) 1998-2009 AOL LLC. |
| 21 | * |
| 22 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 23 | * you may not use this file except in compliance with the License. |
| 24 | * You may obtain a copy of the License at |
| 25 | * |
| 26 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 27 | * |
| 28 | * Unless required by applicable law or agreed to in writing, software |
| 29 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 30 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 31 | * See the License for the specific language governing permissions and |
| 32 | * limitations under the License. |
| 33 | * |
| 34 | **************************************************************************** |
| 35 | * |
| 36 | * @author: zhang |
| 37 | * @version: $Revision$ |
| 38 | * @created: Apr 24, 2009 |
| 39 | * |
| 40 | * Description: A KeySpec for PKCS#1 encoded RSA private key |
| 41 | * |
| 42 | ****************************************************************************/ |
| 43 | |
| 44 | package net.oauth.signature.pem; |
| 45 | |
| 46 | import java.io.IOException; |
| 47 | import java.math.BigInteger; |
| 48 | import java.security.spec.RSAPublicKeySpec; |
| 49 | |
| 50 | /** |
| 51 | * PKCS#1 encoded public key spec. In oauth package as they made all classes |
| 52 | * package visible. |
| 53 | * |
| 54 | * |
| 55 | * @author Adrian Cole |
| 56 | */ |
| 57 | public class PKCS1EncodedPublicKeySpec { |
| 58 | |
| 59 | private RSAPublicKeySpec keySpec; |
| 60 | |
| 61 | /** |
| 62 | * Create a PKCS#1 keyspec from DER encoded buffer |
| 63 | * |
| 64 | * @param keyBytes |
| 65 | * DER encoded octet stream |
| 66 | * @throws IOException |
| 67 | */ |
| 68 | public PKCS1EncodedPublicKeySpec(byte[] keyBytes) throws IOException { |
| 69 | decode(keyBytes); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Get the key spec that JCE understands. |
| 74 | * |
| 75 | * @return CRT keyspec defined by JCE |
| 76 | */ |
| 77 | public RSAPublicKeySpec getKeySpec() { |
| 78 | return keySpec; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Decode PKCS#1 encoded private key into RSAPublicKeySpec. |
| 83 | * |
| 84 | * <p/> |
| 85 | * The ASN.1 syntax for the private key with CRT is |
| 86 | * |
| 87 | * <pre> |
| 88 | * -- |
| 89 | * -- Representation of RSA private key with information for the CRT algorithm. |
| 90 | * -- |
| 91 | * RSAPrivateKey ::= SEQUENCE { |
| 92 | * version Version, |
| 93 | * modulus INTEGER, -- n |
| 94 | * publicExponent INTEGER, -- e |
| 95 | * } |
| 96 | * </pre> |
| 97 | * |
| 98 | * @param keyBytes |
| 99 | * PKCS#1 encoded key |
| 100 | * @throws IOException |
| 101 | */ |
| 102 | |
| 103 | private void decode(byte[] keyBytes) throws IOException { |
| 104 | |
| 105 | DerParser parser = new DerParser(keyBytes); |
| 106 | |
| 107 | Asn1Object sequence = parser.read(); |
| 108 | if (sequence.getType() != DerParser.SEQUENCE) |
| 109 | throw new IOException("Invalid DER: not a sequence"); //$NON-NLS-1$ |
| 110 | |
| 111 | // Parse inside the sequence |
| 112 | parser = sequence.getParser(); |
| 113 | |
| 114 | BigInteger modulus = parser.read().getInteger(); |
| 115 | BigInteger publicExp = parser.read().getInteger(); |
| 116 | |
| 117 | keySpec = new RSAPublicKeySpec(modulus, publicExp); |
| 118 | } |
| 119 | } |