PHP

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

See more Encryption Examples

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.

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Crypt2;
use Chilkat2\StringBuilder;

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

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

echo $sb->GetAsString(), "\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 = new Cert();
try {
    $cert->LoadFromFile('qa_data/rsaes-oaep/cert.pem');

    $crypt = new Crypt2();

    // 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->CryptAlgorithm = 'pki';
    $crypt->Pkcs7CryptAlg = 'aes';
    $crypt->KeyLength = 128;
    $crypt->OaepHash = 'sha256';
    $crypt->OaepPadding = true;

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

    // Now indicate that the PKCS7 output is to be returned in the base64 encoding.
    $crypt->EncodingMode = 'base64';

    $base64Pkcs7 = $crypt->EncryptStringENC($sb->GetAsString());
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Show the output
echo $base64Pkcs7, "\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.

echo "OK.\n";