10-01-2014
Firstly there are already a lot of utilities the encrypt and decrypt files in unix I'd sugget using one of these if you can.
If you must roll you own for all means develop a prototype in shell script, but once it's working I'd suggest converting to C for the final performance version.
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LEARN ABOUT CENTOS
strongimcv_pki---pkcs7
PKI --PKCS7(1) strongSwan PKI --PKCS7(1)
NAME
pki --pkcs7 - Provides PKCS#7 wrap/unwrap functions
SYNOPSIS
pki --pkcs7 --sign|--verify|--encrypt|--decrypt|--show [--in file] [--cert file] [--key file] [--debug level]
pki --pkcs7 --options file
pki --pkcs7 -h | --help
DESCRIPTION
This sub-command of pki(1) provides functions to wrap/unwrap PKCS#7 containers.
OPTIONS
-h, --help
Print usage information with a summary of the available options.
-v, --debug level
Set debug level, default: 1.
-+, --options file
Read command line options from file.
-s, --sign
Create PKCS#7 signed-data.
-u, --verify
Verify PKCS#7 signed-data.
-e, --encrypt
Create PKCS#7 enveloped-data.
-e, --decrypt
Decrypt PKCS#7 enveloped-data.
-p, --show
Show information about PKCS#7 container, list certificates.
-i, --in file
PKCS#7 input file. If not given the input is read from STDIN.
-k, --key file
Private key used for --sign and --decrypt.
-c, --cert file
Certificate for --sign, --verify and --encrypt. Can be used multiple times.
SEE ALSO
pki(1)
5.1.1 2013-07-31 PKI --PKCS7(1)