Hashing with SHA1 Algorithm in C#

问题:

I want to hash given byte[] array with using SHA1 Algorithm with the use of SHA1Managed.
The byte[] hash will come from unit test.
Expected hash is 0d71ee4472658cd5874c5578410a9d8611fc9aef (case sensitive).

How can I achieve this?

public string Hash(byte [] temp) {     using (SHA1Managed sha1 = new SHA1Managed())     {      } } 

回答1:

For those who want a "standard" text formatting of the hash, you can use something like the following:

static string Hash(string input) {     using (SHA1Managed sha1 = new SHA1Managed())     {         var hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(input));         var sb = new StringBuilder(hash.Length * 2);          foreach (byte b in hash)         {             // can be "x2" if you want lowercase             sb.Append(b.ToString("X2"));         }          return sb.ToString();     } } 

This will produce a hash like 0C2E99D0949684278C30B9369B82638E1CEAD415.

Or for a code golfed version:

static string Hash(string input) {     var hash = (new SHA1Managed()).ComputeHash(Encoding.UTF8.GetBytes(input));     return string.Join("", hash.Select(b => b.ToString("x2")).ToArray()); } 

回答2:

public string Hash(byte [] temp) {     using (SHA1Managed sha1 = new SHA1Managed())     {         var hash = sha1.ComputeHash(temp);         return Convert.ToBase64String(hash);     } } 

EDIT:

You could also specify the encoding when converting the byte array to string as follows:

return System.Text.Encoding.UTF8.GetString(hash); 

or

return System.Text.Encoding.Unicode.GetString(hash); 

回答3:

This is what I went with. For those of you who want to optimize, check out https://stackoverflow.com/a/624379/991863.

    public static string Hash(string stringToHash)     {         using (var sha1 = new SHA1Managed())         {             return BitConverter.ToString(sha1.ComputeHash(Encoding.UTF8.GetBytes(stringToHash)));         }     } 

回答4:

You can "compute the value for the specified byte array" using ComputeHash:

var hash = sha1.ComputeHash(temp); 

If you want to analyse the result in string representation, then you will need to format the bytes using the {0:X2} format specifier.

回答5:

I'll throw my hat in here:

(as part of a static class, as this snippet is two extensions)

//hex encoding of the hash, in uppercase. public static string Sha1Hash (this string str) {     byte[] data = UTF8Encoding.UTF8.GetBytes (str);     data = data.Sha1Hash ();     return BitConverter.ToString (data).Replace ("-", ""); } // Do the actual hashing public static byte[] Sha1Hash (this byte[] data) {     using (SHA1Managed sha1 = new SHA1Managed ()) {     return sha1.ComputeHash (data); } 

回答6:

Fastest way is this :

    public static string GetHash(string input)     {         return string.Join("", (new SHA1Managed().ComputeHash(Encoding.UTF8.GetBytes(input))).Select(x => x.ToString("X2")).ToArray());     } 

For Small character output use x2 in replace of of X2

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