| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * 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, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.crypto; |
| 20 | |
| 21 | import java.math.BigInteger; |
| 22 | import java.security.KeyPair; |
| 23 | import java.security.KeyPairGenerator; |
| 24 | import java.security.NoSuchAlgorithmException; |
| 25 | import java.security.interfaces.RSAPrivateKey; |
| 26 | import java.security.interfaces.RSAPublicKey; |
| 27 | import java.util.Map; |
| 28 | |
| 29 | import com.google.common.annotations.Beta; |
| 30 | import com.google.common.base.Throwables; |
| 31 | import com.google.common.collect.ImmutableMap; |
| 32 | import com.google.common.collect.ImmutableMap.Builder; |
| 33 | import com.google.common.io.ByteArrayDataOutput; |
| 34 | import com.google.common.io.ByteStreams; |
| 35 | |
| 36 | /** |
| 37 | * Creates OpenSSH RSA keypairs |
| 38 | * |
| 39 | * @author Adrian Cole |
| 40 | * @see <a href= |
| 41 | * "http://stackoverflow.com/questions/3706177/how-to-generate-ssh-compatible-id-rsa-pub-from-java" |
| 42 | * /> |
| 43 | */ |
| 44 | @Beta |
| 45 | public class SshKeys { |
| 46 | // All data type encoding is defined in the section #5 of RFC #4251. string |
| 47 | // and mpint (multiple precision integer) types are encoded this way : |
| 48 | private static final byte[] sshrsa = new byte[] { 0, 0, 0, 7, 's', 's', 'h', '-', 'r', 's', 'a' }; |
| 49 | |
| 50 | /** |
| 51 | * |
| 52 | * @param used |
| 53 | * to generate RSA key pairs |
| 54 | * @return new 2048 bit keyPair |
| 55 | * @see Crypto#rsaKeyPairGenerator() |
| 56 | */ |
| 57 | public static KeyPair generateRsaKeyPair(KeyPairGenerator generator) { |
| 58 | generator.initialize(2048); |
| 59 | return generator.genKeyPair(); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * return a "public" -> rsa public key, "private" -> its corresponding |
| 64 | * private key |
| 65 | */ |
| 66 | public static Map<String, String> generate() { |
| 67 | try { |
| 68 | return generate(KeyPairGenerator.getInstance("RSA")); |
| 69 | } catch (NoSuchAlgorithmException e) { |
| 70 | Throwables.propagate(e); |
| 71 | return null; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | public static Map<String, String> generate(KeyPairGenerator generator) { |
| 76 | KeyPair pair = generateRsaKeyPair(generator); |
| 77 | Builder<String, String> builder = ImmutableMap.<String, String> builder(); |
| 78 | builder.put("public", encodeAsOpenSSH(RSAPublicKey.class.cast(pair.getPublic()))); |
| 79 | builder.put("private", encodeAsPem(RSAPrivateKey.class.cast(pair.getPrivate()))); |
| 80 | return builder.build(); |
| 81 | } |
| 82 | |
| 83 | public static String encodeAsOpenSSH(RSAPublicKey key) { |
| 84 | ByteArrayDataOutput out = ByteStreams.newDataOutput(); |
| 85 | /* encode the "ssh-rsa" string */ |
| 86 | out.write(sshrsa); |
| 87 | /* Encode the public exponent */ |
| 88 | BigInteger e = key.getPublicExponent(); |
| 89 | byte[] data = e.toByteArray(); |
| 90 | encodeUint32(data.length, out); |
| 91 | out.write(data); |
| 92 | /* Encode the modulus */ |
| 93 | BigInteger m = key.getModulus(); |
| 94 | data = m.toByteArray(); |
| 95 | encodeUint32(data.length, out); |
| 96 | out.write(data); |
| 97 | return "ssh-rsa " + CryptoStreams.base64(out.toByteArray()); |
| 98 | } |
| 99 | |
| 100 | public static String encodeAsPem(RSAPrivateKey key) { |
| 101 | return Pems.pem(key.getEncoded(), Pems.PRIVATE_PKCS1_MARKER, 64); |
| 102 | } |
| 103 | |
| 104 | public static void encodeUint32(int value, ByteArrayDataOutput out) { |
| 105 | out.write((byte) ((value >>> 24) & 0xff)); |
| 106 | out.write((byte) ((value >>> 16) & 0xff)); |
| 107 | out.write((byte) ((value >>> 8) & 0xff)); |
| 108 | out.write((byte) (value & 0xff)); |
| 109 | } |
| 110 | |
| 111 | } |