Hash Functions

GetHash returns the hash value of a byte array.
GetHashStr returns the hash value of a string.

These functions can use any of the hash classes from the System.Security.Cryptography namespace, e.g. MD5, SHA1, SHA256, SHA512.

//C#
using System;
using System.Security.Cryptography;
using System.Text;

namespace ExpressionSoftware.Security.Crypt
{
    public static class Hash
    {
        public static byte[] GetHash(byte[] bs, Type hashType)
        {
            return HashAlgorithm.Create(hashType.Name).ComputeHash(bs);
        }
        
        public static byte[] GetHashStr(string input, Type hashType)
        {
            byte[] bs = Encoding.UTF8.GetBytes(input);
            return GetHash(bs, hashType);
        }
    }
}

//F# v1.9.7.8
namespace ExpressionSoftware.Security.Crypt
open System
open System.Security.Cryptography
open System.Text

module Hash =
  let GetHash(bs:byte[], hashType:Type) =
    HashAlgorithm.Create(hashType.Name).ComputeHash bs

  let GetHashStr(input:string, hashType:Type) =
    Encoding.UTF8.GetBytes input
    |> (fun bs -> GetHash(bs, hashType))

#PowerShell
function getHash($bs, $hashType)
{
  $hashType::create().computeHash($bs)
}

function getHashStr($inputStr, $hashType)
{
  getHash ([system.text.encoding]::utf8.getBytes($inputStr)) $hashType
}

Examples

//C#
byte[] bs = Encoding.UTF8.GetBytes("foo");
byte[] hash = Hash.GetHash(bs, typeof(SHA1));
Debug.WriteLine(Byte.BytesToString(hash, "{0} "));
11 238 199 181 234 63 15 219 201 93 13 212 127 60 91 194 117 218 138 51  //output

//F#
let hash = Hash.GetHashStr("foo", typeof<SHA1>)
Byte.BytesToString(hash, "{0:x} ")
|> (fun s -> printfn "%s" s)
b ee c7 b5 ea 3f f db c9 5d d d4 7f 3c 5b c2 75 da 8a 33  //output

#PowerShell
$hashType = [system.security.cryptography.SHA1]
$hash = getHashStr 'foo' $hashType
bytesToString $hash '{0:X}'
BEEC7B5EA3FFDBC95DDD47F3C5BC275DA8A33  #output