title: Are MD5 hashes always either capital or lowercase?
body: <p>I'm passing an HMAC-MD5 encoded parameter into a form and the vendor is returning it as invalid. However, it matches what their hash generator gives me, with the exception of capitalization on the letters. What I did to get around this was use an lcase command. I'm wondering if this will cause me trouble later. Coldfusion generates the hashed string in capital letters, the vendor always seems to use lowercase; is it always one or the other or will they ever be mixed? </p>