How Can I Securely Hash and Salt Passwords in C# Using Binary Blobs?

C#uses binary blob hash and salt password

In the context of password protection, the password hash and salt play play a vital role in reducing potential security vulnerabilities. David Hayden's article outlines the hash method of the user password, but it introduces a binary blob to a string to store it in a text file and introduce a unconventional method. However, it is recommended to treat hash and salt as binary data to obtain the best security.

A alternative method is to directly use binary blob without the need for string conversion. This method ensures the integrity of hash and salt by avoiding potential coding errors. The following code example demonstrates how to generate binary salt hash:

The generation of salt is the same as the code of Hayden. In order to securely store and add salt hash, it should be encoded into Base64 string.

<code class="language-csharp">static byte[] GenerateSaltedHash(byte[] plainText, byte[] salt)
{
  HashAlgorithm algorithm = new SHA256Managed();

  byte[] plainTextWithSaltBytes = 
    new byte[plainText.Length + salt.Length];

  Array.Copy(plainText, plainTextWithSaltBytes, plainText.Length);
  Array.Copy(salt, 0, plainTextWithSaltBytes, plainText.Length, salt.Length);

  return algorithm.ComputeHash(plainTextWithSaltBytes);
}</code>

For comparison, the following code demonstrates how to correctly check the equal nature of byte array:

In order to enhance security, a new salt must be generated for each password. Salt calculation through randomized hash to help prevent rainbow watches from attacking. Remember to store it safely with salt, instead of leaking the bottom password.

<code class="language-csharp">public static bool CompareByteArrays(byte[] array1, byte[] array2)
{
  if (array1 == null || array2 == null || array1.Length != array2.Length)
  {
    return false;
  }

  for (int i = 0; i < array1.Length; i++)
  {
    if (array1[i] != array2[i])
    {
      return false;
    }
  }

  return true;
}</code>

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