My problem is very similar to this problem. I am working on the new authentication for the yahoo Perl module, but I'm stuck on a part that requires the sha module to do some weird things:
the C code:

shaUpdate(&ctx1, crypt_hash_xor1, 64); 
/* Start of additions */ 
if(j>=3) 
ctx1.sizeLo = 0x1ff; 
/* End of additions */ 
shaUpdate(&ctx1, magic_key_char, 4); 
shaFinal(&ctx1, digest1);
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My problem is the same as the other post in java. I don't see it possible with the current Digest::SHA module to change the sizeLo before I make the digest. My first part of the question is it possible with and current modules?

I am assuming its not..so i decided to port over from the c code and from a python class, both unsuccessful.

c code:
http://www.openaether.org/jabberd2/source/util/sha1.c

my try:
http://www.msndev.com/source/sha/sha1-2.pm

python code:
http://www.msndev.com/source/sha/shatest.py

my try:
http://www.msndev.com/source/sha/SHA.pm

The c conversion gives me a bit shift error, and the python convert...is just wrong?

Thanks in advance Great Ones!