sha1,256,512 on files

[durumdara]

Hi !

I have a problem in Windows.
I need to get the filelist in HDD-s, with sha-N value for every file (to
see what changed in the past).

1.
I see that Python supports the sha-1. But I need to make sha value in
big files to (swap file, iso-s, etc.). Possible that file size more than
2 GB, so I cannot read as string...
How to get the sha value of a file ?
If python not supports that, please give me a link with freeware
command line utility that can do it,and can pass to python.

2.
How to generate sha-256, or sha-512 values ?

Thanx for every help: dd

[Paul Rubin]

"du*******@mailpont.hu" <du*******@mailpont.hu> writes:

I see that Python supports the sha-1. But I need to make sha value in
big files to (swap file, iso-s, etc.). Possible that file size more
than 2 GB, so I cannot read as string...
How to get the sha value of a file ?
Use the sha.update method. Something like:
ctx = sha.new()
while True:
x = f.read(16384)
if not x: break
ctx.update(x)
hash = ctx.digest()
How to generate sha-256, or sha-512 values ?

There are some modules around for this. Unless you're trying to
interoperate with something that needs them, or have some other reason
to want them, I wouldn't bother.