Perl Requires Chilkat v11.0.0+

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

my $pkey = Chilkat2::PrivateKey->new;

# Load the private key from an RSA PEM file:
my $success = $pkey->LoadPemFile('myKey.pem');

my $rsa = Chilkat2::Rsa->new;

# Import the private key into the RSA component:
$success = $rsa->UsePrivateKey($pkey);
if (!$success) {
    print $rsa->LastErrorText, "\n";
    exit;
}

# OpenSSL uses BigEndian byte ordering:
$rsa->LittleEndian(0);

# The resulting signature will be a Base64 string:
$rsa->EncodingMode('base64');

# For simplicity, we're not loading
# the data to be signed from a file.  We are instead simply
# using a literal string value.
my $strData = 'This is the text to be signed.';

# Hash the input using MD5, and then sign the hash:
# Other valid hash algorithm choices are "md2" and "sha-1".
my $base64Sig = $rsa->SignStringENC($strData, 'md5');

print $base64Sig, "\n";

print "Success!\n";