我在我的网站上使用SHA1对密码进行哈希。我正在尝试转向ASP.NET Identity。我发现了如何验证旧密码的方法(ASP.NET Identity默认密码哈希器,它是如何工作的,是否安全?):
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,我想删除旧的哈希(sha1),并保存新的哈希。我该怎么做?
提前感谢!