Question

我腌制了我的登录信息according to this Code Project article

当我这样做时，我在数据库中的密码和盐字段只是varchar列。数据在SQL Server Management Studio中显示为问号。

然后一位朋友来了并将列更改为nvarchar数据类型，现在数据似乎是亚洲字母/单词的集合 - 我认为即使是那些读过任何语言的人也没有任何意义。

现在的问题是，即使我创建了一个新用户，每次登录都会失败。

用户添加和登录

    public User Login() // returns an instance of its own class
    {

        // get the salt value for the user
        var auser = ie.users.FirstOrDefault(u => String.Compare(u.emailaddress, emailaddress, false) == 0);
        if (auser == null)
        {
            throw new ValidationException("User not found");
        }

        // hash the login for comparison to stored password hash
        HashGenerator h = new HashGenerator(password, auser.usersalt);
        string hash = h.GetHash();

        var us = ie.users.FirstOrDefault(u => String.Compare(u.emailaddress, emailaddress, false) == 0 && String.Compare(u.password, password, false) == 0);

        if (us == null)
        {
            throw new Exception("Invalid email address and/or password."); // seems here's where it goes wrong
        }
        User user = new User();

        user.userid = us.userid;
        user.storeid = us.storeid;
        user.role = us.role;

        return user; // login succeeded, return the data to the calling method
    }

    public void Add()
    {
        user newuser = new user();
        newuser.storeid = storeid;
        newuser.emailaddress = emailaddress;

        // Generate password hash
        string usersalt = SaltGenerator.GetSaltString();
        HashGenerator hash = new HashGenerator(password, usersalt);
        newuser.password = hash.GetHash();

        newuser.role = role;
        newuser.usersalt = usersalt;

        ie.users.Add(newuser);
        ie.SaveChanges();
    }

哈希和盐生成器

public class HashGenerator
{
    public string pass { get; protected set; }
    public string salt { get; protected set; }

    public HashGenerator(string Password, string Salt)
    {
        pass = Password;
        salt = Salt;
    }

    public string GetHash()
    {
        SHA512 sha = new SHA512CryptoServiceProvider();
        byte[] data = CryptUtility.GetBytes(String.Format("{0}{1}", pass, salt));
        byte[] hash = sha.ComputeHash(data);

        return CryptUtility.GetString(hash);
    }
}

public static class SaltGenerator
{
    private static RNGCryptoServiceProvider provider = null;
    private const int saltSize = 128;

    static SaltGenerator()
    {
        provider = new RNGCryptoServiceProvider();
    }

    public static string GetSaltString()
    {
        byte[] saltBytes = new byte[saltSize];

        provider.GetNonZeroBytes(saltBytes);

        return CryptUtility.GetString(saltBytes);
    }
}

用于获取字符串和字节的加密实用程序

class CryptUtility
{
    public static byte[] GetBytes(string Str)
    {
        byte[] bytes = new byte[Str.Length * sizeof(char)];
        System.Buffer.BlockCopy(Str.ToCharArray(), 0, bytes, 0, bytes.Length);
        return bytes;
    }

    public static string GetString(byte[] Bytes)
    {
        char[] chars = new char[Bytes.Length / sizeof(char)];
        System.Buffer.BlockCopy(Bytes, 0, chars, 0, Bytes.Length);
        return new string(chars);
    }
}

以前的登录工作和此代码从那时起没有改变...唯一改变的是用户表中的密码和salt列现在是nvarchar而不是varchar

那就是说，我想我用上面的add方法创建了一个新用户，但是登录该用户也失败了。

我真的不知道如何解决这个问题。如果我无法访问它进行测试，我无法继续开发系统的其余部分。

任何帮助将不胜感激！

Answer 1

进行数据库备份并转换回varchar。或者在转换之前回滚到备份。在将数据类型转换为nvarchar时，您的朋友似乎做错了。

Answer 2

humm你不应该使用变量

散列

进行比较？

    // hash the login for comparison to stored password hash
    HashGenerator h = new HashGenerator(password, auser.usersalt);
    string hash = h.GetHash();

    var us = ie.users.FirstOrDefault(u => String.Compare(u.emailaddress, emailaddress, false) == 0 && String.Compare(u.password, hash, false) == 0);

密码哈希曾经工作，现在我无法进入我的软件

2 个答案: