1 /* 2 * Copyright 2017 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 org.conscrypt; 18 19 import java.security.Key; 20 import java.security.KeyPair; 21 import java.security.KeyPairGenerator; 22 import java.security.NoSuchAlgorithmException; 23 import javax.crypto.KeyGenerator; 24 import org.bouncycastle.jce.provider.BouncyCastleProvider; 25 26 /** 27 * Supported cipher transformations. 28 */ 29 @SuppressWarnings({"ImmutableEnumChecker", "unused"}) 30 public enum Transformation { 31 AES_CBC_PKCS5("AES", "CBC", "PKCS5Padding", new AesKeyGen()), 32 AES_ECB_PKCS5("AES", "ECB", "PKCS5Padding", new AesKeyGen()), 33 AES_GCM_NO("AES", "GCM", "NoPadding", new AesKeyGen()), 34 RSA_ECB_PKCS1("RSA", "ECB", "PKCS1Padding", new RsaKeyGen()); 35 36 Transformation(String algorithm, String mode, String padding, KeyGen keyGen) { 37 this.algorithm = algorithm; 38 this.mode = mode; 39 this.padding = padding; 40 this.keyGen = keyGen; 41 } 42 43 final String algorithm; 44 final String mode; 45 final String padding; 46 final KeyGen keyGen; 47 48 String toFormattedString() { 49 return algorithm + "/" + mode + "/" + padding; 50 } 51 52 Key newEncryptKey() { 53 return keyGen.newEncryptKey(); 54 } 55 56 private interface KeyGen { Key newEncryptKey(); } 57 58 private static final class RsaKeyGen implements KeyGen { 59 @Override 60 public Key newEncryptKey() { 61 try { 62 // Use Bouncy castle 63 KeyPairGenerator generator = 64 KeyPairGenerator.getInstance("RSA", new BouncyCastleProvider()); 65 generator.initialize(2048); 66 KeyPair pair = generator.generateKeyPair(); 67 return pair.getPublic(); 68 } catch (NoSuchAlgorithmException e) { 69 throw new RuntimeException(e); 70 } 71 } 72 } 73 74 private static final class AesKeyGen implements KeyGen { 75 @Override 76 public Key newEncryptKey() { 77 try { 78 // Just use the JDK's provider. 79 KeyGenerator keyGen = KeyGenerator.getInstance("AES"); 80 keyGen.init(256); 81 return keyGen.generateKey(); 82 } catch (NoSuchAlgorithmException e) { 83 throw new RuntimeException(e); 84 } 85 } 86 } 87 } 88