(Perl) RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

Encrypts a string using RSAES-OAEP with SHA256 and AES-128 content encryption to produce PKCS7 output (base64 encoded).

Note: This example requires Chilkat v9.5.0.67 or greater.

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.

# First build a string to be encrypted
$sb = chilkat::CkStringBuilder->new();
$i = 1;
while ($i < 25) {
    $sb->AppendInt($i);
    $sb->Append(" the quick brown fox jumped over the lazy dog.\r\n");
    $i = $i + 1;
}

print $sb->getAsString() . "\r\n";

# The string to be encrypted looks like this:

# 1 the quick brown fox jumped over the lazy dog.
# 2 the quick brown fox jumped over the lazy dog.
# 3 the quick brown fox jumped over the lazy dog.
# 4 the quick brown fox jumped over the lazy dog.
# 5 the quick brown fox jumped over the lazy dog.
# 6 the quick brown fox jumped over the lazy dog.
# ...

# Load a digital certificate. 
# We don't need the private key for encryption.
# Only the public key is needed (which is included in a certificate).
$cert = chilkat::CkCert->new();
$success = $cert->LoadFromFile("qa_data/rsaes-oaep/cert.pem");
if ($success != 1) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

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

# Tell the crypt object to use the certificate.
$crypt->SetEncryptCert($cert);

# Indicate that we want PKI encryption (i.e. public-key infrastructure)
# to produce a CMS message (Cryptographic Message Syntax/PKCS7),
# that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the
# bulk encryption.
$crypt->put_CryptAlgorithm("pki");
$crypt->put_Pkcs7CryptAlg("aes");
$crypt->put_KeyLength(128);
$crypt->put_OaepHash("sha256");
$crypt->put_OaepPadding(1);

# Also, don't forget to be specific about the character encoding (byte representation) of the
# string to be encrypted.
$crypt->put_Charset("utf-8");

# Now indicate that the PKCS7 output is to be returned in the base64 encoding.
$crypt->put_EncodingMode("base64");

$base64Pkcs7 = $crypt->encryptStringENC($sb->getAsString());
if ($crypt->get_LastMethodSuccess() != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

# Show the output
print $base64Pkcs7 . "\r\n";

# This base64 can be copy-and-pasted into the form at http://lapo.it/asn1js/
# to verify that all the chosen algorithms were indeed used.

print "OK." . "\r\n";