密码，加密，解密

spring-security-crypto-5.7.3.jar

/** Copyright 2002-2011 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.bcrypt;import java.security.SecureRandom;
import java.util.regex.Matcher;
import java.util.regex.Pattern;import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;import org.springframework.security.crypto.password.PasswordEncoder;/*** Implementation of PasswordEncoder that uses the BCrypt strong hashing function. Clients* can optionally supply a "version" ($2a, $2b, $2y) and a "strength" (a.k.a. log rounds* in BCrypt) and a SecureRandom instance. The larger the strength parameter the more work* will have to be done (exponentially) to hash the passwords. The default value is 10.** @author Dave Syer*/
public class BCryptPasswordEncoder implements PasswordEncoder {private Pattern BCRYPT_PATTERN = Pattern.compile("\\A\\$2(a|y|b)?\\$(\\d\\d)\\$[./0-9A-Za-z]{53}");private final Log logger = LogFactory.getLog(getClass());private final int strength;private final BCryptVersion version;private final SecureRandom random;public BCryptPasswordEncoder() {this(-1);}/*** @param strength the log rounds to use, between 4 and 31*/public BCryptPasswordEncoder(int strength) {this(strength, null);}/*** @param version the version of bcrypt, can be 2a,2b,2y*/public BCryptPasswordEncoder(BCryptVersion version) {this(version, null);}/*** @param version the version of bcrypt, can be 2a,2b,2y* @param random the secure random instance to use*/public BCryptPasswordEncoder(BCryptVersion version, SecureRandom random) {this(version, -1, random);}/*** @param strength the log rounds to use, between 4 and 31* @param random the secure random instance to use*/public BCryptPasswordEncoder(int strength, SecureRandom random) {this(BCryptVersion.$2A, strength, random);}/*** @param version the version of bcrypt, can be 2a,2b,2y* @param strength the log rounds to use, between 4 and 31*/public BCryptPasswordEncoder(BCryptVersion version, int strength) {this(version, strength, null);}/*** @param version the version of bcrypt, can be 2a,2b,2y* @param strength the log rounds to use, between 4 and 31* @param random the secure random instance to use*/public BCryptPasswordEncoder(BCryptVersion version, int strength, SecureRandom random) {if (strength != -1 && (strength < BCrypt.MIN_LOG_ROUNDS || strength > BCrypt.MAX_LOG_ROUNDS)) {throw new IllegalArgumentException("Bad strength");}this.version = version;this.strength = (strength == -1) ? 10 : strength;this.random = random;}@Overridepublic String encode(CharSequence rawPassword) {if (rawPassword == null) {throw new IllegalArgumentException("rawPassword cannot be null");}String salt = getSalt();return BCrypt.hashpw(rawPassword.toString(), salt);}private String getSalt() {if (this.random != null) {return BCrypt.gensalt(this.version.getVersion(), this.strength, this.random);}return BCrypt.gensalt(this.version.getVersion(), this.strength);}@Overridepublic boolean matches(CharSequence rawPassword, String encodedPassword) {if (rawPassword == null) {throw new IllegalArgumentException("rawPassword cannot be null");}if (encodedPassword == null || encodedPassword.length() == 0) {this.logger.warn("Empty encoded password");return false;}if (!this.BCRYPT_PATTERN.matcher(encodedPassword).matches()) {this.logger.warn("Encoded password does not look like BCrypt");return false;}return BCrypt.checkpw(rawPassword.toString(), encodedPassword);}@Overridepublic boolean upgradeEncoding(String encodedPassword) {if (encodedPassword == null || encodedPassword.length() == 0) {this.logger.warn("Empty encoded password");return false;}Matcher matcher = this.BCRYPT_PATTERN.matcher(encodedPassword);if (!matcher.matches()) {throw new IllegalArgumentException("Encoded password does not look like BCrypt: " + encodedPassword);}int strength = Integer.parseInt(matcher.group(2));return strength < this.strength;}/*** Stores the default bcrypt version for use in configuration.** @author Lin Feng*/public enum BCryptVersion {$2A("$2a"),$2Y("$2y"),$2B("$2b");private final String version;BCryptVersion(String version) {this.version = version;}public String getVersion() {return this.version;}}}