Using libgcrypt on large files

[Moritz Schulte]

On Wed, Feb 23, 2005 at 10:41:20PM +0100, Ralf H wrote:

> 2) What can I do if the file is really large and will not fit into
> memory? My approach will obviously fail, as I need everything in
> 'data' :(. Is there a way to hash a file in little portions, so I can
> read in buffers and update my signatures in a loop?

No, no: *hash* your file; with gcry_md_*() functions.  And then, sign
the *hash value* (optionally with pkcs1) - not the file data itself.
Have a look at the Libgcrypt manual,

Thanks,
Moritz.

-- 
Moritz Schulte
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 193 bytes
Desc: not available
Url : /pipermail/attachments/20050224/246fc5a1/attachment.pgp