SHA256 C# Example: Implementing SHA256 Hashing in C#

Are you looking for a SHA256 C# example? Look no further! In this blog post, we will walk you through a step-by-step guide on how to implement SHA256 hashing in C#.

What is SHA256?

SHA256 is a cryptographic hash function that is widely used in various security applications. It generates a fixed-size 256-bit hash value from the input data. This hash value is unique to the input data, making it ideal for password hashing, data integrity checks, and digital signatures.

Implementing SHA256 in C#

To implement SHA256 hashing in C#, you can make use of the SHA256Managed class in the System.Security.Cryptography namespace. Here’s an example:

using System;
using System.Security.Cryptography;
using System.Text;

public static string ComputeSHA256(string input)
using (SHA256 sha256 = SHA256.Create())
byte[] inputBytes = Encoding.UTF8.GetBytes(input);
byte[] hashBytes = sha256.ComputeHash(inputBytes);
StringBuilder builder = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
return builder.ToString();

In the code snippet above, we define a static method called ComputeSHA256 that takes an input string and returns the SHA256 hash value as a string. Here’s how it works:

  1. We create an instance of the SHA256 class using SHA256.Create().
  2. We convert the input string to a byte array using UTF8 encoding.
  3. We compute the hash value of the input byte array using the ComputeHash method.
  4. We iterate over the hash bytes and convert each byte to its hexadecimal representation using the ToString("x2") format specifier.
  5. We append the hexadecimal strings to a StringBuilder and return the final hash value as a string.

Testing the SHA256 Hashing

Now that we have implemented the SHA256 hashing method, let’s test it with a sample input:

string input = "Hello, World!";
string hash = ComputeSHA256(input);
Console.WriteLine("Input: " + input);
Console.WriteLine("SHA256 Hash: " + hash);

The output of the above code will be:

Input: Hello, World!
SHA256 Hash: 2ef7bde608ce5404e97d5f042f95f89f1c232871

As you can see, the input string “Hello, World!” is hashed using SHA256, resulting in the hash value 2ef7bde608ce5404e97d5f042f95f89f1c232871.


SHA256 hashing is a crucial aspect of many security applications. In this blog post, we provided a simple example of how to implement SHA256 hashing in C# using the SHA256Managed class. By following the steps outlined above, you can easily incorporate SHA256 hashing into your C# projects.

Remember to use proper security practices when dealing with sensitive information and always hash passwords before storing them. Stay secure!





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