spring security KeyGenerators 源码
spring security KeyGenerators 代码
文件路径：/crypto/src/main/java/org/springframework/security/crypto/keygen/KeyGenerators.java
/*
* Copyright 2011-2016 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.keygen;
import java.security.SecureRandom;
/**
* Factory for commonly used key generators. Public API for constructing a
* {@link BytesKeyGenerator} or {@link StringKeyGenerator}.
*
* @author Keith Donald
*/
public final class KeyGenerators {
private KeyGenerators() {
}
/**
* Create a {@link BytesKeyGenerator} that uses a {@link SecureRandom} to generate
* keys of 8 bytes in length.
*/
public static BytesKeyGenerator secureRandom() {
return new SecureRandomBytesKeyGenerator();
}
/**
* Create a {@link BytesKeyGenerator} that uses a {@link SecureRandom} to generate
* keys of a custom length.
* @param keyLength the key length in bytes, e.g. 16, for a 16 byte key.
*/
public static BytesKeyGenerator secureRandom(int keyLength) {
return new SecureRandomBytesKeyGenerator(keyLength);
}
/**
* Create a {@link BytesKeyGenerator} that returns a single, shared
* {@link SecureRandom} key of a custom length.
* @param keyLength the key length in bytes, e.g. 16, for a 16 byte key.
*/
public static BytesKeyGenerator shared(int keyLength) {
return new SharedKeyGenerator(secureRandom(keyLength).generateKey());
}
/**
* Creates a {@link StringKeyGenerator} that hex-encodes {@link SecureRandom} keys of
* 8 bytes in length. The hex-encoded string is keyLength * 2 characters in length.
*/
public static StringKeyGenerator string() {
return new HexEncodingStringKeyGenerator(secureRandom());
}
}
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