[dkim-dev] ATPS v01 - Hash Length
hsantos at santronics.com
Thu Sep 30 12:16:54 PDT 2010
Hector Santos wrote:
> But what if we allow ATPS for a wild card hash?
> RRYSFVSSZN56ELIZQ3Y7GCYH7VIQRWOA._atps TXT ("v=atps01; d=*.example.com;")
Btw, I was exploring this sub-domain wildcard idea and for the
I was getting a short BASE32(SHA1("*.winserver.com")) result and
depending on what base32 encoding function used, you can get "=" padding.
2VGN3G3GATAIHHTMGWPQ====._atps TXT ("v=atps01; d=*.winserver.com;")
shorter than 32. I checked this with various base32(sha1()) library
methods. All produce the same result.
Without the *. subdomain prefix, you get:
JCHJYKXMWKNBYFGE2BG4TD6ADD264OLH._atps TXT ("v=atps01;
and other wild card hashing does this show this hashing behavior:
JEDGYSVHEMSBM3UKHZWRKOIKTIIULR3I._atps TXT ("v=atps01;
3LZJLXW37GAOBEWLNDWERVOC6SY5VTUI._atps TXT ("v=atps01; d=*.isdg.net;")
I am not sure if this show there could be collisions with the
base32(sha1()) algorithm or that you were always expecting an uniform
32 character hash result.
More information about the dkim-dev