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