Hashing with SHA1 Algorithm in C

Question

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

User · Answer

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

User · Answer

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 Concat hash Select b   gt  b ToString  x2

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Fastest way is this        public static string GetHash string input                return string Join      new SHA1Managed   ComputeHash Encoding UTF8 GetBytes input    Select x   gt  x ToString  X2    ToArray             For Small character output use x2 in replace of of X2

[c#] Hashing with SHA1 Algorithm in C#

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