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Top Forums Shell Programming and Scripting Bash - array loop performance Post 302919518 by Chubler_XL on Wednesday 1st of October 2014 04:55:06 PM
Old 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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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)
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