HMAC MD5 is covered in RFC 2202 which you can read at
http://www.faqs.org/rfcs/rfc2202.html
This RFC contains a reference implementation in C that you could port or
use directly (after compiling, from the External action.)
Tango and Witango implement a regular MD5 digest as <@CIPHER ACTION=HASH>.
On Thu, 6 Mar 2003, Chris Millet wrote:
> Speaking of Authorize.net, I believe they are now requiring an HMAC MD5 hash
> on all transactions. They provide snippets for ASP, PHP, and PERL, but
> nothing that I know how to use with Witango.
>
> Does anyone know how to generate this hash?
>
> Chris
>
>
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