Generate a Guid based on a string [duplicate]

Question

We would like to generate a Guid based on some random string. The goal would be that the Guid is always the same for a given string.

Just to be clear, my string is not formated as a guid, it could be "Toto" as "asdfblkajsdflknasldknalkvkndlskfj".

I know that this would generate some Guid that is as unique as my input string, but it's not the question here.

Answer 1

Since both a Guid and a MD5 hash are 128 bits integers, you could use the MD5 of a given string as the Guid. It will reproduce the same value consistently:

using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
{
    byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
    byte[] hashBytes = md5.ComputeHash(inputBytes);

    Guid g = new Guid(hashBytes);
}