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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.android.ide.eclipse.adt.internal.utils;
import java.util.Locale;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
public class FingerprintUtils {
/**
* Returns the {@link Certificate} fingerprint as returned by <code>keytool</code>.
*
* @param certificate
* @param hashAlgorithm
*/
public static String getFingerprint(Certificate cert, String hashAlgorithm) {
if (cert == null) {
return null;
}
try {
MessageDigest digest = MessageDigest.getInstance(hashAlgorithm);
return toHexadecimalString(digest.digest(cert.getEncoded()));
} catch(NoSuchAlgorithmException e) {
// ignore
} catch(CertificateEncodingException e) {
// ignore
}
return null;
}
private static String toHexadecimalString(byte[] value) {
StringBuffer sb = new StringBuffer();
int len = value.length;
for (int i = 0; i < len; i++) {
int num = ((int) value[i]) & 0xff;
if (num < 0x10) {
sb.append('0');
}
sb.append(Integer.toHexString(num));
if (i < len - 1) {
sb.append(':');
}
}
return sb.toString().toUpperCase(Locale.US);
}
}
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