Hash string in c#

user_473962 0
Viewed 226040

I have a problem when trying get a hash string in c#.

I already tried a few websites, but most of them are using files to get the hash. Others that are for strings are a bit too complex. I found examples for Windows authentication for web like this:

FormsAuthentication.HashPasswordForStoringInConfigFile(tbxPassword.Text.Trim(), "md5")

I need to use a hash to make a string that contains a filename more secure. How can I do that?

Example:

string file  = "username";
string hash = ??????(username);

Should I use another hashing algorithm and not "md5"?

hash string c#
8 Answers

All the hashing code samples here are outdated. In.NET 5, a new way of hashing data is provided to us which is double fast and does zero memory allocation. ain't that cool? You just need to use the new static HashData(byte[]) on your favorite hashing algorithm class.

byte[] buffer = Encoding.UTF8.GetBytes(input);
byte[] digest = SHA256.HashData(buffer);

Microsoft has a new rule in its analyzer to detect legacy usages and replace them with the new API.

user_17807600

The shortest and fastest way ever. Only 1 line!

    public static string StringSha256Hash(string text) =>
        string.IsNullOrEmpty(text) ? string.Empty : BitConverter.ToString(new System.Security.Cryptography.SHA256Managed().ComputeHash(System.Text.Encoding.UTF8.GetBytes(text))).Replace("-", string.Empty);
user_24263670

If performance is not a major concern, you can also use any of these methods:
(In case you wanted the hash string to be in upper case, replace "x2" with "X2".)

public static string SHA256ToString(string s) 
{
    using (var alg = SHA256.Create())
        return string.Join(null, alg.ComputeHash(Encoding.UTF8.GetBytes(s)).Select(x => x.ToString("x2")));
}

or:

public static string SHA256ToString(string s)
{            
    using (var alg = SHA256.Create())
        return alg.ComputeHash(Encoding.UTF8.GetBytes(s)).Aggregate(new StringBuilder(), (sb, x) => sb.Append(x.ToString("x2"))).ToString();
}
user_70897990
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