第五章编码/加密——《跟我学Shiro》

发布时间：2015-09-03 03:00:11

在涉及到密码存储问题上，应该加密/生成密码摘要存储，而不是存储明文密码。比如之前的600w csdn账号泄露对用户可能造成很大损失，因此应加密/生成不可逆的摘要方式存储。 5.1 编码/解码 Shiro提供了base64和16进制字符串编码/解码的API支持，方便一些编码 ...

在涉及到密码存储问题上，应该加密/生成密码摘要存储，而不是存储明文密码。比如之前的600w csdn账号泄露对用户可能造成很大损失，因此应加密/生成不可逆的摘要方式存储。

5.1 编码/解码

Shiro提供了base64和16进制字符串编码/解码的API支持，方便一些编码解码操作。Shiro内部的一些数据的存储/表示都使用了base64和16进制字符串。

Java代码

DefaultHashService hashService = new DefaultHashService(); //默认算法SHA-512
hashService.setHashAlgorithmName("SHA-512");
hashService.setPrivateSalt(new SimpleByteSource("123")); //私盐，默认无
hashService.setGeneratePublicSalt(true);//是否生成公盐，默认false
hashService.setRandomNumberGenerator(new SecureRandomNumberGenerator());//用于生成公盐。默认就这个
hashService.setHashIterations(1); //生成Hash值的迭代次数
HashRequest request = new HashRequest.Builder()
.setAlgorithmName("MD5").setSource(ByteSource.Util.bytes("hello"))
.setSalt(ByteSource.Util.bytes("123")).setIterations(2).build();
String hex = hashService.computeHash(request).toHex();

AesCipherService aesCipherService = new AesCipherService();
aesCipherService.setKeySize(128); //设置key长度
//生成key
Key key = aesCipherService.generateNewKey();
String text = "hello";
//加密
String encrptText =
aesCipherService.encrypt(text.getBytes(), key.getEncoded()).toHex();
//解密
String text2 =
new String(aesCipherService.decrypt(Hex.decode(encrptText), key.getEncoded()).getBytes());
Assert.assertEquals(text, text2);

public interface PasswordService {
//输入明文密码得到密文密码
String encryptPassword(Object plaintextPassword) throws IllegalArgumentException;
}

public class MyRealm extends AuthorizingRealm {
private PasswordService passwordService;
public void setPasswordService(PasswordService passwordService) {
this.passwordService = passwordService;
}
//省略doGetAuthorizationInfo，具体看代码
@Override
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
return new SimpleAuthenticationInfo(
"wu",
passwordService.encryptPassword("123"),
getName());
}
}

String algorithmName = "md5";
String username = "liu";
String password = "123";
String salt1 = username;
String salt2 = new SecureRandomNumberGenerator().nextBytes().toHex();
int hashIterations = 2;
SimpleHash hash = new SimpleHash(algorithmName, password, salt1 + salt2, hashIterations);
String encodedPassword = hash.toHex();

protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
String username = "liu"; //用户名及salt1
String password = "202cb962ac59075b964b07152d234b70"; //加密后的密码
String salt2 = "202cb962ac59075b964b07152d234b70";
SimpleAuthenticationInfo ai =
new SimpleAuthenticationInfo(username, password, getName());
ai.setCredentialsSalt(ByteSource.Util.bytes(username+salt2)); //盐是用户名+随机数
return ai;
}

jdbcRealm.saltStyle=COLUMN
jdbcRealm.authenticationQuery=select password, concat(username,password_salt) from users where username = ?
jdbcRealm.credentialsMatcher=$credentialsMatcher

public boolean doCredentialsMatch(AuthenticationToken token, AuthenticationInfo info) {
String username = (String)token.getPrincipal();
//retry count + 1
Element element = passwordRetryCache.get(username);
if(element == null) {
element = new Element(username , new AtomicInteger(0));
passwordRetryCache.put(element);
}
AtomicInteger retryCount = (AtomicInteger)element.getObjectValue();
if(retryCount.incrementAndGet() > 5) {
//if retry count > 5 throw
throw new ExcessiveAttemptsException();
}
boolean matches = super.doCredentialsMatch(token, info);
if(matches) {
//clear retry count
passwordRetryCache.remove(username);
}
return matches;
}

原标题：第五章编码/加密——《跟我学Shiro》

关键词：Shiro

Shiro

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