C# MD5 and SHA encryption wrapper class

January 14, 2009

This is a simple utility class for MD5 (128bit) or SHA-2 (256bit,384bit and 512bit) hash encryption.

It outputs the string using 2 byte hex values, e.g. AB12FE. It doesn’t include SHA-1 but that’s trivial to add.

	public class HashEncryption
	{
	/// <summary>
	/// Encrypts a string using the MD5 hash encryption algorithm.
	/// Message Digest is 128-bit and is commonly used to verify data, by checking
	/// the 'MD5 checksum' of the data. Information on MD5 can be found at:
	///
	/// http://www.faqs.org/rfcs/rfc1321.html
	/// </summary>
	/// <param name="Data">A string containing the data to encrypt.</param>
	/// <returns>A string containing the string, encrypted with the MD5 hash.</returns>
	public static string MD5Hash(string Data)
	{
	MD5 md5 = new MD5CryptoServiceProvider();
	byte[] hash = md5.ComputeHash(Encoding.ASCII.GetBytes(Data));
	StringBuilder stringBuilder = new StringBuilder();
	foreach (byte b in hash)
	{
	stringBuilder.AppendFormat("{0:x2}", b);
	}
	return stringBuilder.ToString();
	}

	/// <summary>
	/// Computes an MD5 hash for the provided file.
	/// </summary>
	/// <param name="filename">The full path to the file</param>
	/// <returns>A hexadecimal encoded MD5 hash for the file.</returns>
	public static string MD5FileHash(string filename)
	{
	using (FileStream stream = new FileStream(filename, FileMode.Open, FileAccess.Read))
	{
	using (MD5 md5 = new MD5CryptoServiceProvider())
	{
	byte[] hash = md5.ComputeHash(stream);
	StringBuilder builder = new StringBuilder();
	foreach (byte b in hash)
	{
	builder.AppendFormat("{0:x2}", b);
	}
	return builder.ToString();
	}
	}
	}

	/// <summary>
	/// Encrypts a string using the SHA256 (Secure Hash Algorithm) algorithm.
	/// Details: http://www.itl.nist.gov/fipspubs/fip180-1.htm
	/// This works in the same manner as MD5, providing however 256bit encryption.
	/// </summary>
	/// <param name="Data">A string containing the data to encrypt.</param>
	/// <returns>A string containing the string, encrypted with the SHA256 algorithm.</returns>
	public static string SHA256Hash(string Data)
	{
	SHA256 sha = new SHA256Managed();
	byte[] hash = sha.ComputeHash(Encoding.ASCII.GetBytes(Data));
	StringBuilder stringBuilder = new StringBuilder();
	foreach (byte b in hash)
	{
	stringBuilder.AppendFormat("{0:x2}", b);
	}
	return stringBuilder.ToString();
	}

	/// <summary>
	/// Encrypts a string using the SHA384(Secure Hash Algorithm) algorithm.
	/// This works in the same manner as MD5, providing 384bit encryption.
	/// </summary>
	/// <param name="Data">A string containing the data to encrypt.</param>
	/// <returns>A string containing the string, encrypted with the SHA384 algorithm.</returns>
	public static string SHA384Hash(string Data)
	{
	SHA384 sha = new SHA384Managed();
	byte[] hash = sha.ComputeHash(Encoding.ASCII.GetBytes(Data));
	StringBuilder stringBuilder = new StringBuilder();
	foreach (byte b in hash)
	{
	stringBuilder.AppendFormat("{0:x2}", b);
	}
	return stringBuilder.ToString();
	}

	/// <summary>
	/// Encrypts a string using the SHA512 (Secure Hash Algorithm) algorithm.
	/// This works in the same manner as MD5, providing 512bit encryption.
	/// </summary>
	/// <param name="Data">A string containing the data to encrypt.</param>
	/// <returns>A string containing the string, encrypted with the SHA512 algorithm.</returns>
	public static string SHA512Hash(string Data)
	{
	SHA512 sha = new SHA512Managed();
	byte[] hash = sha.ComputeHash(Encoding.ASCII.GetBytes(Data));
	StringBuilder stringBuilder = new StringBuilder();
	foreach (byte b in hash)
	{
	stringBuilder.AppendFormat("{0:x2}", b);
	}
	return stringBuilder.ToString();
	}
	}

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csharpencryption

I'm Chris Small, a software engineer working in London. This is my tech blog. Find out more about me via Github, Stackoverflow, Resume