65 lines
2.0 KiB
Java
65 lines
2.0 KiB
Java
/*
|
|
* Copyright (C) 2007 The Android Open Source Project
|
|
*
|
|
* 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 android.security;
|
|
|
|
import java.security.NoSuchAlgorithmException;
|
|
|
|
/**
|
|
* Base class for producing a message digest from different hash encryptions.
|
|
*/
|
|
public abstract class MessageDigest
|
|
{
|
|
/**
|
|
* Returns a digest object of the specified type.
|
|
*
|
|
* @param algorithm The type of hash function to use. Valid values are
|
|
* <em>SHA-1</em> and <em>MD5</em>.
|
|
* @return The respective MessageDigest object. Either a
|
|
* {@link android.security.Sha1MessageDigest} or
|
|
* {@link android.security.Md5MessageDigest} object.
|
|
* @throws NoSuchAlgorithmException If an invalid <var>algorithm</var>
|
|
* is given.
|
|
*/
|
|
public static MessageDigest getInstance(String algorithm)
|
|
throws NoSuchAlgorithmException
|
|
{
|
|
if (algorithm == null) {
|
|
return null;
|
|
}
|
|
|
|
if (algorithm.equals("SHA-1")) {
|
|
return new Sha1MessageDigest();
|
|
}
|
|
else if (algorithm.equals("MD5")) {
|
|
return new Md5MessageDigest();
|
|
}
|
|
|
|
throw new NoSuchAlgorithmException();
|
|
}
|
|
|
|
public abstract void update(byte[] input);
|
|
public abstract byte[] digest();
|
|
|
|
/**
|
|
* Produces a message digest for the given input.
|
|
*
|
|
* @param input The message to encrypt.
|
|
* @return The digest (hash sum).
|
|
*/
|
|
public abstract byte[] digest(byte[] input);
|
|
}
|