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Java client for Nexmo APIs
/*
* Copyright (c) 2011-2017 Nexmo Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.nexmo.client.auth;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Contains utility methods that use MD5 hashing. The class uses STANDARD JVM MD5 algorithm.
*
* @author Paul Cook
*/
public class MD5Util {
/**
* Calculates MD5 hash for string. assume string is UTF-8 encoded
* @param input string which is going to be encoded into MD5 format
* @return MD5 representation of the input string
* @throws NoSuchAlgorithmException if the MD5 algorithm is not available.
*/
public static String calculateMd5(String input) throws NoSuchAlgorithmException {
try {
return calculateMd5(input, "UTF-8");
} catch (UnsupportedEncodingException e) {
return null; // -- impossible --
}
}
/**
* Calculates MD5 hash for string.
* @param input string which is going to be encoded into MD5 format
* @param encoding character encoding of the string which is going to be encoded into MD5 format
* @return MD5 representation of the input string
* @throws NoSuchAlgorithmException if the MD5 algorithm is not available.
* @throws UnsupportedEncodingException if the specified encoding is unavailable.
*/
public static String calculateMd5(String input, String encoding) throws NoSuchAlgorithmException, UnsupportedEncodingException {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(input.getBytes(encoding));
byte digest[] = md.digest();
final StringBuilder hexString = new StringBuilder();
for (byte element : digest) {
int z = 0xFF & element;
if (z < 16)
hexString.append("0");
hexString.append(Integer.toHexString(z));
}
return hexString.toString();
}
}