(PHP Extension) RSA Decrypt using PEM

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$rsa = new CkRsa();

$key = new CkPrivateKey();

// Load an RSA private key from an unencrypted PEM file:
// (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

$success = $key->LoadPemFile('qa_data/rsa/decryptTest/priv.pem');
if ($success != true) {
    print $key->lastErrorText() . "\n";
    exit;
}

// Make the key available to the RSA object
$success = $rsa->ImportPrivateKeyObj($key);
if ($success != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

$encryptedStr = 'pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA==';

$rsa->put_EncodingMode('base64');

$usePrivateKey = true;
$decryptedStr = $rsa->decryptStringENC($encryptedStr,$usePrivateKey);

print 'Decrypted:' . "\n";
print $decryptedStr . "\n";

?>