(Perl) Encrypt File using X.509 Certificate using AES in CBC Mode

Demonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.)

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

#  This example requires the Chilkat Crypt API to have been previously unlocked.
#  See Unlock Chilkat Crypt for sample code.

$crypt = chilkat::CkCrypt2->new();

#  Use public-key cryptography for encryption.
$crypt->put_CryptAlgorithm("pki");

#  Get an X.509 certificate to use for encrypting.
#  Note: Chilkat provides many different ways of loading a certificate, from many different formats,
#  or if on Windows, from the installed certificates on the system.
#  This example simply loads a certificate from a file.
#  Also, for encryption, only the public key is needed.  Digital certificates embed the public key
#  within the X.509 format itself.  Therefore, if you have a certificate, you also have the public key.
$cert = chilkat::CkCert->new();
$success = $cert->LoadFromFile("qa_data/certs/testCert.cer");
if ($success != 1) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

$success = $crypt->SetEncryptCert($cert);
if ($success != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

#  Indicate the underlying bulk encryption algorithm to be used:
$crypt->put_Pkcs7CryptAlg("aes");
$crypt->put_KeyLength(128);

#  Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...)

#  There's one last option that could be set.  If is the RSA encryption encryption/padding scheme.
#  By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to 1 to
#  use RSAES_OAEP.  (We'll leave it set at the default value of 0)
$crypt->put_OaepPadding(0);

#  Everything is specified.  Now just encrypt...
#  The output is PKCS7 in binary DER format.
$success = $crypt->CkEncryptFile("qa_data/hamlet.xml","qa_output/hamlet.p7");
if ($success != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

print "Finished." . "\r\n";