MIME S/MIME Encryption Algorithm Properties

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Demonstrates the properties that control S/MIME encryption: Pkcs7CryptAlg (the symmetric content-encryption algorithm), Pkcs7KeyLength (the content-encryption key length in bits), OaepPadding (whether RSAES-OAEP key transport is used instead of RSAES-PKCS1-v1_5), and the OAEP hash settings OaepHash and OaepMgfHash. The properties are configured before calling Encrypt.

<?php

$success = 0;

$mime = new COM("Chilkat.Mime");
$success = $mime->SetBodyFromPlainText('This message will be encrypted.');
if ($success == 0) {
    print $mime->LastErrorText . "\n";
    exit;
}

//  Pkcs7CryptAlg is the symmetric content-encryption algorithm.  Supported values are aes, aes-gcm,
//  des, 3des, and rc2.  The default is aes.
$mime->Pkcs7CryptAlg = 'aes';

//  Pkcs7KeyLength is the content-encryption key length in bits.  The default is 128.
$mime->Pkcs7KeyLength = 256;

//  OaepPadding selects the RSA key-transport padding.  The default is 0 (RSAES-PKCS1-v1_5).
//  Set 1 to use RSAES-OAEP, in which case the OAEP hash settings apply.
$mime->OaepPadding = 1;
$mime->OaepHash = 'sha256';
$mime->OaepMgfHash = 'sha256';

//  Load the recipient certificate (public key is sufficient for encrypting).
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadFromFile('qa_data/recipient.cer');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

//  Encrypt using the algorithm settings configured above.
$success = $mime->Encrypt($cert);
if ($success == 0) {
    print $mime->LastErrorText . "\n";
    exit;
}

print 'Encrypted with ' . $mime->Pkcs7CryptAlg . ' ' . $mime->Pkcs7KeyLength . '-bit key.' . "\n";

?>