Geremy Condra | cee5bfd | 2014-06-11 13:38:45 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.verity; |
| 18 | |
| 19 | import java.lang.reflect.Constructor; |
| 20 | import java.io.File; |
| 21 | import java.io.FileInputStream; |
| 22 | import java.io.FileOutputStream; |
| 23 | import java.io.IOException; |
| 24 | import java.security.PrivateKey; |
| 25 | import java.security.PublicKey; |
| 26 | import java.security.KeyFactory; |
| 27 | import java.security.Provider; |
| 28 | import java.security.Security; |
| 29 | import java.security.Signature; |
| 30 | import java.security.spec.X509EncodedKeySpec; |
| 31 | import java.security.spec.PKCS8EncodedKeySpec; |
| 32 | |
| 33 | import org.bouncycastle.util.encoders.Base64; |
| 34 | |
| 35 | public class Utils { |
| 36 | |
| 37 | private static void loadProviderIfNecessary(String providerClassName) { |
| 38 | if (providerClassName == null) { |
| 39 | return; |
| 40 | } |
| 41 | |
| 42 | final Class<?> klass; |
| 43 | try { |
| 44 | final ClassLoader sysLoader = ClassLoader.getSystemClassLoader(); |
| 45 | if (sysLoader != null) { |
| 46 | klass = sysLoader.loadClass(providerClassName); |
| 47 | } else { |
| 48 | klass = Class.forName(providerClassName); |
| 49 | } |
| 50 | } catch (ClassNotFoundException e) { |
| 51 | e.printStackTrace(); |
| 52 | System.exit(1); |
| 53 | return; |
| 54 | } |
| 55 | |
| 56 | Constructor<?> constructor = null; |
| 57 | for (Constructor<?> c : klass.getConstructors()) { |
| 58 | if (c.getParameterTypes().length == 0) { |
| 59 | constructor = c; |
| 60 | break; |
| 61 | } |
| 62 | } |
| 63 | if (constructor == null) { |
| 64 | System.err.println("No zero-arg constructor found for " + providerClassName); |
| 65 | System.exit(1); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | final Object o; |
| 70 | try { |
| 71 | o = constructor.newInstance(); |
| 72 | } catch (Exception e) { |
| 73 | e.printStackTrace(); |
| 74 | System.exit(1); |
| 75 | return; |
| 76 | } |
| 77 | if (!(o instanceof Provider)) { |
| 78 | System.err.println("Not a Provider class: " + providerClassName); |
| 79 | System.exit(1); |
| 80 | } |
| 81 | |
| 82 | Security.insertProviderAt((Provider) o, 1); |
| 83 | } |
| 84 | |
| 85 | static byte[] pemToDer(String pem) throws Exception { |
| 86 | pem = pem.replaceAll("^-.*", ""); |
| 87 | String base64_der = pem.replaceAll("-.*$", ""); |
| 88 | return Base64.decode(base64_der); |
| 89 | } |
| 90 | |
| 91 | static PrivateKey loadDERPrivateKey(byte[] der) throws Exception { |
| 92 | PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(der); |
| 93 | KeyFactory keyFactory = KeyFactory.getInstance("RSA"); |
| 94 | return (PrivateKey) keyFactory.generatePrivate(keySpec); |
| 95 | } |
| 96 | |
| 97 | static PrivateKey loadPEMPrivateKey(byte[] pem) throws Exception { |
| 98 | byte[] der = pemToDer(new String(pem)); |
| 99 | return loadDERPrivateKey(der); |
| 100 | } |
| 101 | |
| 102 | static PrivateKey loadPEMPrivateKeyFromFile(String keyFname) throws Exception { |
| 103 | return loadPEMPrivateKey(read(keyFname)); |
| 104 | } |
| 105 | |
| 106 | static PrivateKey loadDERPrivateKeyFromFile(String keyFname) throws Exception { |
| 107 | return loadDERPrivateKey(read(keyFname)); |
| 108 | } |
| 109 | |
| 110 | static PublicKey loadDERPublicKey(byte[] der) throws Exception { |
| 111 | X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(der); |
| 112 | KeyFactory factory = KeyFactory.getInstance("RSA"); |
| 113 | return factory.generatePublic(publicKeySpec); |
| 114 | } |
| 115 | |
| 116 | static PublicKey loadPEMPublicKey(byte[] pem) throws Exception { |
| 117 | byte[] der = pemToDer(new String(pem)); |
| 118 | X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(der); |
| 119 | KeyFactory factory = KeyFactory.getInstance("RSA"); |
| 120 | return factory.generatePublic(publicKeySpec); |
| 121 | } |
| 122 | |
| 123 | static PublicKey loadPEMPublicKeyFromFile(String keyFname) throws Exception { |
| 124 | return loadPEMPublicKey(read(keyFname)); |
| 125 | } |
| 126 | |
| 127 | static PublicKey loadDERPublicKeyFromFile(String keyFname) throws Exception { |
| 128 | return loadDERPublicKey(read(keyFname)); |
| 129 | } |
| 130 | |
| 131 | static byte[] sign(PrivateKey privateKey, byte[] input) throws Exception { |
| 132 | Signature signer = Signature.getInstance("SHA1withRSA"); |
| 133 | signer.initSign(privateKey); |
| 134 | signer.update(input); |
| 135 | return signer.sign(); |
| 136 | } |
| 137 | |
| 138 | static byte[] read(String fname) throws Exception { |
| 139 | long offset = 0; |
| 140 | File f = new File(fname); |
| 141 | long length = f.length(); |
| 142 | byte[] image = new byte[(int)length]; |
| 143 | FileInputStream fis = new FileInputStream(f); |
| 144 | while (offset < length) { |
| 145 | offset += fis.read(image, (int)offset, (int)(length - offset)); |
| 146 | } |
| 147 | fis.close(); |
| 148 | return image; |
| 149 | } |
| 150 | |
| 151 | static void write(byte[] data, String fname) throws Exception{ |
| 152 | FileOutputStream out = new FileOutputStream(fname); |
| 153 | out.write(data); |
| 154 | out.close(); |
| 155 | } |
| 156 | } |