Perl Requires Chilkat v11.0.0+

RSA Encrypt String to Encoded Result and Reverse

See more RSA Examples

Demonstrates how to RSA encrypt a string to a base64 encoded result, and the reverse. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# The RSA public key is used for encryption, and the private key for decryption.

# The public key's role is to make encryption accessible to anyone while ensuring that
# only the private key holder can decrypt the messages.
# The public key is designed to be widely distributed so anyone can use it to encrypt messages
# intended for the owner of the private key.

# Load our 2048-bit RSA public key.
my $pubKey = Chilkat2::PublicKey->new;
# In all Chilkat methods expecting a path, you pass either absolute or relative paths.
my $success = $pubKey->LoadFromFile('rsaKeys/myTestRsaPublic.pem');
if (!$success) {
    print $pubKey->LastErrorText, "\n";
    exit;
}

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

# Tell RSA to use the public key.
$rsa->UsePublicKey($pubKey);

# RSA encryption is for small amounts of data, on the order of 200 bytes or less.
# The maximum number of bytes that can be RSA encrypted depends
# on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding).
# For specific limits, see: RSA Encryption Maximum Number of Bytes

# Encrypt the utf-8 byte representation of the string.
$rsa->Charset('utf-8');
$rsa->EncodingMode('base64');

# Be Careful when Using non-us-ascii String Literals in Source Code
my $encryptedB64 = $rsa->EncryptStringENC('Élève français dîne à côté d’un café où l’on sert déjà du gâteau au chocolat et des éclairs délicieux', 0);

# ------------------------------------------------------------------------------------------------------------------------
# Let's decrypt, which requires the matching private key...

# Load the matching 2048-bit RSA private key.
my $privKey = Chilkat2::PrivateKey->new;
my $password = 'secret';
$success = $privKey->LoadAnyFormatFile('rsaKeys/myTestRsaPrivate.pem', $password);
if (!$success) {
    print $privKey->LastErrorText, "\n";
    exit;
}

# Tell the RSA object to use the private key.
$rsa->UsePrivateKey($privKey);

# Indicate that after decrypting the resultant decrypted bytes contains the utf-8 byte representation of the text.
$rsa->Charset('utf-8');
$rsa->EncodingMode('base64');
my $originalText = $rsa->DecryptStringENC($encryptedB64, 1);
if (!$success) {
    print $rsa->LastErrorText, "\n";
    exit;
}

print 'Original text = ', $originalText, "\n";
print "Success.\n";