/*
* Copyright 2012 Amazon.com, Inc. or its affiliates. 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.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.amazonaws.eclipse.elasticbeanstalk.git.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.util.Locale;
import com.amazonaws.AmazonClientException;
import com.amazonaws.SignableRequest;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSSessionCredentials;
import com.amazonaws.auth.AbstractAWSSigner;
import com.amazonaws.auth.SigningAlgorithm;
public class BinaryUtils {
public static byte[] hash(String text) throws AmazonClientException {
try {
return hash(getBytes(text));
} catch (Exception e) {
throw new AmazonClientException("Unable to compute hash while signing request: " + e.getMessage(), e);
}
}
public static byte[] hash(byte[] data) throws AmazonClientException {
try {
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(data);
return md.digest();
} catch (Exception e) {
throw new AmazonClientException("Unable to compute hash while signing request: " + e.getMessage(), e);
}
}
public static byte[] sign(final byte[] data, final byte[] key) throws AmazonClientException {
return new AbstractAWSSigner() {
public void sign(SignableRequest<?> arg0, AWSCredentials arg1) {}
protected void addSessionCredentials(SignableRequest<?> arg0, AWSSessionCredentials arg1) {}
public byte[] sign() {
return sign(data, key, SigningAlgorithm.HmacSHA256);
}
}.sign();
}
public static String toHex(byte[] data) {
StringBuilder sb = new StringBuilder(data.length * 2);
for (int i = 0; i < data.length; i++) {
String hex = Integer.toHexString(data[i]);
if (hex.length() == 1) {
// Append leading zero.
sb.append("0");
} else if (hex.length() == 8) {
// Remove ff prefix from negative numbers.
hex = hex.substring(6);
}
sb.append(hex);
}
return sb.toString().toLowerCase(Locale.getDefault());
}
public static byte[] getBytes(String s) {
try {
return s.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("Unable to encode bytes as UTF-8");
}
}
}