Re: pkcs7-md5 and pkcs7-sha1 micalg values

> I propose that the micalg parameter for multipart/signed messages with
> the "application/pkcs7-signature" protocol be defined as pkcs7-md5 and
> pkcs7-sha1 for the MD5 and SHA-1 digest algorithms respectively.  I
> further propose that any future digest algorithms that are supported for
> S/MIME keep the "pkcs7-" prefix.
Why?  What technical purpose would be served by doing this?

Keith