经过一番研究和一些工作,我终于可以对密码进行哈希处理了,现在有一个问题在我的脑海中,我已经使用了SHA1方法,我想尝试使用SHA512,因为被告知更好(更安全),因此以下是我的代码,尽管有点,但我认为它是可以理解的:
public class Safety
{
//calling some parameters for possible later changes
public static final String algorithm = "PBKDF2WithHmacSHA1";
public static final int saltbytesize = 24;
public static final int hashbytesize = 24;
public static final int iterations = 1000;
public static final int iIndex = 0;
public static final int sIndex = 1;
public static final int pbkIndex = 2;
public static Users passwordHash(Users user) throws NoSuchAlgorithmException,
InvalidKeySpecException
{
SecureRandom sR = new SecureRandom();
byte[] pws = new byte[saltbytesize];
sR.nextBytes(pws);
byte[] pwh = pbkdf2(user.getPassword().toCharArray(), pws, iterations, hashbytesize);
user.setPassword(toHex(pwh));
byte[] sas = new byte[saltbytesize];
sR.nextBytes(sas);
byte[] sah = pbkdf2(user.getsA().toCharArray(), sas, iterations, hashbytesize);
user.setsA(toHex(sah));
user.setUserhash(pws);
user.setSahash(sas);
return user;
}
public static boolean hashpassword(String username, String password, Users user)
throws NoSuchAlgorithmException,
InvalidKeySpecException
{
byte[] pws = user.getUserhash();
byte[] pwh = pbkdf2(password.toCharArray(), pws, iterations, hashbytesize);
String searcher = toHex(pwh) + username;
String searched = user.getPassword() + user.getUsername();
if (searcher.equals(searched))
{
return true;
}
return false;
}
private static byte[] pbkdf2(char[] password, byte[] salt,
int iterations, int bytes)
throws NoSuchAlgorithmException, InvalidKeySpecException
{
PBEKeySpec spec = new PBEKeySpec(password, salt, iterations, bytes * 8);
SecretKeyFactory skf = SecretKeyFactory.getInstance(algorithm);
return skf.generateSecret(spec).getEncoded();
}
private static String toHex(byte[] array)
{
BigInteger bi = new BigInteger(1, array);
String hex = bi.toString(16);
int paddingLength = (array.length * 2) - hex.length();
if (paddingLength > 0)
return String.format("%0" + paddingLength + "d", 0) + hex;
else
return hex;
}
}
因此,这就是我的代码,但是我无法使用SHA512,并且我已经尝试过
public static final String algorithm = "PBKDF2WithHmacSHA512"
,但这似乎不是该算法的正确字符串,因为它没有引发此类算法异常。我也欢迎任何可以使代码更好的更改。
如上所述!
相关的几行代码
公共静态最终字符串算法=“PBKDF2WithHmacSHA512” <<<<<
最佳答案
开箱即用
OpenJDK实现只提供了一个PBKDF2HmacSHA1Factory.java,它带有“HmacSHA1”摘要摘要。据我测试,Oracle JDK在这方面没有什么不同。
您需要做的就是派生PBKDF2HmacSHA1Factory
(来吧,它是 open !),并向其构造函数添加一个参数。您可以避免创建自己的Provider
的麻烦,只需按以下步骤初始化和使用工厂即可:
PBKDF_SecretKeyFactory kf = new PBKDF_SecretKeyFactory("HmacSHA512");
KeySpec ks = new PBEKeySpec(password,salt,iterations,bitlen);
byte key[] = kf.engineGenerateSecret(ks).getEncoded();