07-20-2017
i think that if you have a huge input file, it will take time whatever method you use. There is no table-of-contents idea, so there is no way to know what the expected size will be. Perhaps you could consider a different approach:-
- Get the file name & size of the plain file before encryption
- Get a checksum of the file after encryption and link to the above
When you need the information, you can get the values from wherever you stored it a validate that the encrypted file is the same one by generating the current checksum.
It will still read the file to generate the checksum when you want to validate it, but it does not need to do decryption processing, so that might save a bit.
Basically though, large files will take time.......
Robin
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LEARN ABOUT DEBIAN
shishi_authenticator_add_cksum_type
shishi_authenticator_add_cksum_type(3) shishi shishi_authenticator_add_cksum_type(3)
NAME
shishi_authenticator_add_cksum_type - API function
SYNOPSIS
#include <shishi.h>
int shishi_authenticator_add_cksum_type(Shishi * handle, Shishi_asn1 authenticator, Shishi_key * key, int keyusage, int cksumtype, char *
data, size_t datalen);
ARGUMENTS
Shishi * handle
shishi handle as allocated by shishi_init().
Shishi_asn1 authenticator
authenticator as allocated by shishi_authenticator().
Shishi_key * key
key to to use for encryption.
int keyusage
cryptographic key usage value to use in encryption.
int cksumtype
checksum to type to calculate checksum.
char * data input array with data to calculate checksum on.
size_t datalen
size of input array with data to calculate checksum on.
DESCRIPTION
Calculate checksum for data and store it in the authenticator.
RETURN VALUE
Returns SHISHI_OK iff successful.
REPORTING BUGS
Report bugs to <bug-shishi@gnu.org>.
COPYRIGHT
Copyright (C) 2002-2010 Simon Josefsson.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
SEE ALSO
The full documentation for shishi is maintained as a Texinfo manual. If the info and shishi programs are properly installed at your site,
the command
info shishi
should give you access to the complete manual.
shishi 1.0.1 shishi_authenticator_add_cksum_type(3)