spring security Digester 源码
spring security Digester 代码
文件路径：/crypto/src/main/java/org/springframework/security/crypto/password/Digester.java
/*
* Copyright 2011-2018 the original author or authors.
*
* 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
*
* https://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 org.springframework.security.crypto.password;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Helper for working with the MessageDigest API.
*
* Performs the configured number of iterations of the hashing algorithm per digest to aid
* in protecting against brute force attacks.
*
* @author Keith Donald
* @author Luke Taylor
*/
final class Digester {
private final String algorithm;
private int iterations;
/**
* Create a new Digester.
* @param algorithm the digest algorithm; for example, "SHA-1" or "SHA-256".
* @param iterations the number of times to apply the digest algorithm to the input
*/
Digester(String algorithm, int iterations) {
// eagerly validate the algorithm
createDigest(algorithm);
this.algorithm = algorithm;
setIterations(iterations);
}
byte[] digest(byte[] value) {
MessageDigest messageDigest = createDigest(this.algorithm);
for (int i = 0; i < this.iterations; i++) {
value = messageDigest.digest(value);
}
return value;
}
void setIterations(int iterations) {
if (iterations <= 0) {
throw new IllegalArgumentException("Iterations value must be greater than zero");
}
this.iterations = iterations;
}
private static MessageDigest createDigest(String algorithm) {
try {
return MessageDigest.getInstance(algorithm);
}
catch (NoSuchAlgorithmException ex) {
throw new IllegalStateException("No such hashing algorithm", ex);
}
}
}
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