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SSHKeysHelper.java
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109 lines (87 loc) · 3.22 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package com.cloud.utils.ssh;
import java.io.ByteArrayOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.codec.binary.Base64;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.KeyPair;
public class SSHKeysHelper {
private KeyPair keyPair;
private static final char[] hexChars = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
private static String toHexString(byte[] b) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
sb.append(hexChars[ (int)(((int)b[i] >> 4) & 0x0f)]);
sb.append(hexChars[ (int)(((int)b[i]) & 0x0f)]);
}
return sb.toString();
}
public SSHKeysHelper() {
try {
keyPair = KeyPair.genKeyPair(new JSch(), KeyPair.RSA);
} catch (JSchException e) {
e.printStackTrace();
}
}
public String getPublicKeyFingerPrint() {
return getPublicKeyFingerprint(getPublicKey());
}
public static String getPublicKeyFingerprint(String publicKey) {
String key[] = publicKey.split(" ");
if (key.length < 2) {
throw new RuntimeException("Incorrect public key is passed in");
}
byte[] keyBytes = Base64.decodeBase64(key[1]);
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
String sumString = toHexString(md5.digest(keyBytes));
String rString = "";
for (int i = 2; i <= sumString.length(); i += 2) {
rString += sumString.substring(i-2, i);
if (i != sumString.length())
rString += ":";
}
return rString;
}
public static String getPublicKeyFromKeyMaterial(String keyMaterial) {
if (!keyMaterial.contains(" "))
keyMaterial = new String(Base64.decodeBase64(keyMaterial.getBytes()));
if ((!keyMaterial.startsWith("ssh-rsa") && !keyMaterial.startsWith("ssh-dss")) || !keyMaterial.contains(" "))
return null;
String[] key = keyMaterial.split(" ");
if (key.length < 2)
return null;
return key[0].concat(" ").concat(key[1]);
}
public String getPublicKey() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
keyPair.writePublicKey(baos, "");
return baos.toString();
}
public String getPrivateKey() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
keyPair.writePrivateKey(baos);
return baos.toString();
}
}