Created
September 2, 2018 02:06
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Creating Your Own Epicor Password Hashing - SHA256
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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Threading.Tasks; | |
| using System.Security.Cryptography; | |
| namespace ConsoleApplication2 | |
| { | |
| class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| // Create a New Hash with password manager | |
| Console.WriteLine(ComputeHash("manager")); | |
| // Lets Validate all these possible hashes against Password manager (one-way hash) | |
| Console.WriteLine(VerifyHash("manager", "46uIY6/nQjHL5mX1KeE/7NtEXD3MIOblGxpVRH5ZWXNORGsNwT3WHg==")); | |
| Console.WriteLine(VerifyHash("manager", "JIzKviG6ZG5rE52KOeKEg4AvPnU72FOUQ0y7y/R8h8GZNQaV2G+GHw==")); | |
| Console.WriteLine(VerifyHash("manager", "tjk/TfHesmjnhq7NcUbCkfQKJnqfV7Q2mJRG6hwYRD8xGIofA6tGIQ==")); | |
| Console.WriteLine(VerifyHash("WRONG_PASSWORD", "tjk/TfHesmjnhq7NcUbCkfQKJnqfV7Q2mJRG6hwYRD8xGIofA6tGIQ==")); | |
| Console.ReadLine(); | |
| } | |
| public static string ComputeHash(string password, byte[] saltBytes = null) | |
| { | |
| HashAlgorithm algorithm = new SHA256Managed(); | |
| if (saltBytes == null) | |
| { | |
| saltBytes = new byte[8]; | |
| new RNGCryptoServiceProvider().GetNonZeroBytes(saltBytes); | |
| } | |
| byte[] bytes = Encoding.UTF8.GetBytes(password); | |
| byte[] buffer = new byte[bytes.Length + saltBytes.Length]; | |
| for (int i = 0; i < bytes.Length; i++) | |
| buffer[i] = bytes[i]; | |
| for (int j = 0; j < saltBytes.Length; j++) | |
| buffer[bytes.Length + j] = saltBytes[j]; | |
| byte[] buffer2 = algorithm.ComputeHash(buffer); | |
| byte[] combinedArr = new byte[buffer2.Length + saltBytes.Length]; | |
| for (int k = 0; k < buffer2.Length; k++) | |
| combinedArr[k] = buffer2[k]; | |
| for (int m = 0; m < saltBytes.Length; m++) | |
| combinedArr[buffer2.Length + m] = saltBytes[m]; | |
| return Convert.ToBase64String(combinedArr); | |
| } | |
| public static bool VerifyHash(string password, string hash) | |
| { | |
| byte[] saltBytes = new byte[8]; | |
| byte[] buffer = Convert.FromBase64String(hash); | |
| int x = 0x100 / 8; // SHA256 | |
| if (buffer.Length < x) | |
| return false; | |
| for (int i = 0; i < saltBytes.Length; i++) | |
| saltBytes[i] = buffer[x + i]; | |
| return (hash == ComputeHash(password, saltBytes)); | |
| } | |
| } | |
| } |
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