/**
*
* Copyright (C) 2008 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with 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.mongodb.util;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Misc utility helpers. Not sure what else to call the class
*/
public class Util {
public static String toHex( byte b[] ){
StringBuilder sb = new StringBuilder();
for ( int i=0; i<b.length; i++ ){
String s = Integer.toHexString(0xff & b[i]);
if (s.length() < 2) {
sb.append("0");
}
sb.append(s);
}
return sb.toString();
}
/**
* Produce hex representation of the MD5 digest of a byte array
*
* @param data bytes to digest
* @return hex string of the MD5 digest
*/
public static String hexMD5(byte[] data) {
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.reset();
md5.update(data);
byte digest[] = md5.digest();
return toHex( digest );
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Error - this implementation of Java doesn't support MD5.");
}
}
public static String hexMD5( ByteBuffer buf , int offset , int len ){
byte b[] = new byte[len];
for ( int i=0; i<len; i++ )
b[i] = buf.get( offset + i );
return hexMD5( b );
}
}