我使用SHA1在我的网站上散列密码。我正在尝试迁移到ASP.NET Identity。我找到了验证旧密码(ASP.NET Identity default Password Hasher, how does it work and is it secure?)的方法:
public class CustomPasswordHasher : IPasswordHasher
{
//....
public static bool VerifyHashedPassword(string hashedPassword, string password)
{
byte[] buffer4;
if (hashedPassword == null)
{
return false;
}
if (password == null)
{
throw new ArgumentNullException("password");
}
// Old hash verification
using (SHA1Managed sha1 = new SHA1Managed())
{
var hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(password));
var sb = new StringBuilder(hash.Length * 2);
foreach (byte b in hash)
{
sb.Append(b.ToString("x2"));
}
if(hashedPassword == sb.ToString()) return true;
else return false;
}
// Identity hash verification
byte[] src = Convert.FromBase64String(hashedPassword);
if ((src.Length != 0x31) || (src[0] != 0))
{
return false;
}
byte[] dst = new byte[0x10];
Buffer.BlockCopy(src, 1, dst, 0, 0x10);
byte[] buffer3 = new byte[0x20];
Buffer.BlockCopy(src, 0x11, buffer3, 0, 0x20);
using (Rfc2898DeriveBytes bytes = new Rfc2898DeriveBytes(password, dst, 0x3e8))
{
buffer4 = bytes.GetBytes(0x20);
}
return ByteArraysEqual(buffer3, buffer4);
}
//....
}
在我的自定义ApplicationUserManager中,我设置了PasswordHasher属性:
//....
manager.PasswordHasher = new CustomPasswordHasher();
//....
现在,我想删除旧的散列(Sha1)并保存新的hash.How,我可以这样做吗?
提前感谢!
发布于 2017-01-25 12:16:54
您不能这样做,直到用户尝试登录-您只有SHA1散列。从SHA1你不能转换成其他的散列算法。
但是当用户登录时,他们的密码在内存中,可以使用它来生成新的散列。下面是一些伪代码:
public void Login(String username, String password)
{
if(DoesOldHashMatch(username, password)){
var newHash = NewHasher.GetPasswordHash(password);
UpdateUserPasswordHash(username, newHash);
SetLoginCookie(username);
return;
}
if(NewHashMatch(username, password))
{
SetLoginCookie(username);
}
}
https://stackoverflow.com/questions/41850205
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