How can I SHA512 a string in C#?

Question

I am trying to write a function to take a string and sha512 it like so?

public string SHA512(string input)
{
     string hash;

     ~magic~

     return has         


        

Answer 1

512/8 = 64, so 64 is indeed the correct size. Perhaps you want to convert it to hexadecimal after the SHA512 algorithm.

See also: How do you convert Byte Array to Hexadecimal String, and vice versa?

Answer 2

I'm not sure why you are expecting 128.

8 bits in a byte. 64 bytes. 8 * 64 = 512 bit hash.

Answer 3

You could use the System.Security.Cryptography.SHA512 class

MSDN on SHA512

Here is an example, straigt from the MSDN

byte[] data = new byte[DATA_SIZE];
byte[] result;
SHA512 shaM = new SHA512Managed();
result = shaM.ComputeHash(data);

Answer 4

I used the following

public static string ToSha512(this string inputString)
{
        if (string.IsNullOrWhiteSpace(inputString)) return string.Empty;
        using (SHA512 shaM = new SHA512Managed())
        {
            return Convert.ToBase64String(shaM.ComputeHash(Encoding.UTF8.GetBytes(inputString)));
        }
}

Answer 5

This is from one of my projects:

public static string SHA512(string input)
{
    var bytes = System.Text.Encoding.UTF8.GetBytes(input);
    using (var hash = System.Security.Cryptography.SHA512.Create())
    {
        var hashedInputBytes = hash.ComputeHash(bytes);

        // Convert to text
        // StringBuilder Capacity is 128, because 512 bits / 8 bits in byte * 2 symbols for byte 
        var hashedInputStringBuilder = new System.Text.StringBuilder(128);
        foreach (var b in hashedInputBytes)
            hashedInputStringBuilder.Append(b.ToString("X2"));
        return hashedInputStringBuilder.ToString();
    }
}

Please, note:

1. SHA512 object is disposed ('using' section), so we do not have any resource leaks.
2. StringBuilder is used for efficient hex string building.

Answer 6

From the MSDN Documentation:
The hash size for the SHA512Managed algorithm is 512 bits.