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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aaf
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * ===========================================================================
* * 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.cadi;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Hash {
private static char hexDigit[] = "0123456789abcdef".toCharArray();
/////////////////////////////////
// MD5
/////////////////////////////////
/**
* Encrypt MD5 from Byte Array to Byte Array
* @param input
* @return
* @throws NoSuchAlgorithmException
*/
public static byte[] encryptMD5 (byte[] input) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(input);
return md.digest();
}
/**
* Encrypt MD5 from Byte Array to Byte Array
* @param input
* @return
* @throws NoSuchAlgorithmException
*/
public static byte[] encryptMD5 (byte[] input, int offset, int length) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(input,offset,length);
return md.digest();
}
/**
* Convenience Function: Encrypt MD5 from String to String Hex representation
*
* @param input
* @return
* @throws NoSuchAlgorithmException
*/
public static String encryptMD5asStringHex(String input) throws NoSuchAlgorithmException {
byte[] output = encryptMD5(input.getBytes());
StringBuilder sb = new StringBuilder("0x");
for (byte b : output) {
sb.append(hexDigit[(b >> 4) & 0x0f]);
sb.append(hexDigit[b & 0x0f]);
}
return sb.toString();
}
/////////////////////////////////
// SHA256
/////////////////////////////////
/**
* SHA256 Hashing
*/
public static byte[] hashSHA256(byte[] input) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(input);
return md.digest();
}
/**
* SHA256 Hashing
*/
public static byte[] hashSHA256(byte[] input, int offset, int length) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(input,offset,length);
return md.digest();
}
/**
* Convenience Function: Hash from String to String Hex representation
*
* @param input
* @return
* @throws NoSuchAlgorithmException
*/
public static String hashSHA256asStringHex(String input) throws NoSuchAlgorithmException {
byte[] output = hashSHA256(input.getBytes());
StringBuilder sb = new StringBuilder("0x");
for (byte b : output) {
sb.append(hexDigit[(b >> 4) & 0x0f]);
sb.append(hexDigit[b & 0x0f]);
}
return sb.toString();
}
/**
* Convenience Function: Hash from String to String Hex representation
*
* @param input
* @return
* @throws NoSuchAlgorithmException
*/
public static String hashSHA256asStringHex(String input, int salt) throws NoSuchAlgorithmException {
byte[] in = input.getBytes();
ByteBuffer bb = ByteBuffer.allocate(Integer.SIZE + in.length);
bb.putInt(salt);
bb.put(input.getBytes());
byte[] output = Hash.hashSHA256(bb.array());
StringBuilder sb = new StringBuilder("0x");
for (byte b : output) {
sb.append(hexDigit[(b >> 4) & 0x0f]);
sb.append(hexDigit[b & 0x0f]);
}
return sb.toString();
}
/**
* Compare two byte arrays for equivalency
* @param ba1
* @param ba2
* @return
*/
public static boolean isEqual(byte ba1[], byte ba2[]) {
if(ba1.length!=ba2.length)return false;
for(int i = 0;i<ba1.length; ++i) {
if(ba1[i]!=ba2[i])return false;
}
return true;
}
public static int compareTo(byte[] a, byte[] b) {
int end = Math.min(a.length, b.length);
int compare = 0;
for(int i=0;compare == 0 && i<end;++i) {
compare = a[i]-b[i];
}
if(compare==0)compare=a.length-b.length;
return compare;
}
public static String toHex(byte[] ba) {
StringBuilder sb = new StringBuilder("0x");
for (byte b : ba) {
sb.append(hexDigit[(b >> 4) & 0x0f]);
sb.append(hexDigit[b & 0x0f]);
}
return sb.toString();
}
public static byte[] fromHex(String s) throws CadiException{
if(!s.startsWith("0x")) {
throw new CadiException("HexString must start with \"0x\"");
}
boolean high = true;
int c;
byte b;
byte[] ba = new byte[(s.length()-2)/2];
int idx;
for(int i=2;i<s.length();++i) {
c = s.charAt(i);
if(c>=0x30 && c<=0x39) {
b=(byte)(c-0x30);
} else if(c>=0x61 && c<=0x66) {
b=(byte)(c-0x57); // account for "A"
} else if(c>=0x41 && c<=0x46) {
b=(byte)(c-0x37);
} else {
throw new CadiException("Invalid char '" + c + "' in HexString");
}
idx = (i-2)/2;
if(high) {
ba[idx]=(byte)(b<<4);
high = false;
} else {
ba[idx]|=b;
high = true;
}
}
return ba;
}
}
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