(PHP ActiveX) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");

// First load a public key object with a public key.
// In this case, we'll load it from a file.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey')
$pubkey = new COM("Chilkat.PublicKey");
$success = $pubkey->LoadFromFile('qa_data/pem/rsa_public.pem');
if ($success != 1) {
    print $pubkey->LastErrorText . "\n";
    exit;
}

// RSA encryption is limited to small amounts of data. The limit
// is typically a few hundred bytes and is based on the key size and
// padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
// encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
$plainText = 'Time is an illusion. Lunchtime doubly so.';

// Import the public key to be used for encrypting.
$success = $rsa->ImportPublicKeyObj($pubkey);

// To get OAEP padding, set the OaepPadding property:
$rsa->OaepPadding = 1;

// To use SHA1 or SHA-256, set the OaepHash property
$rsa->OaepHash = 'sha256';
// for SHA1 --
$rsa->OaepHash = 'sha1';

// Indicate we'll want hex output
$rsa->EncodingMode = 'hex';

// Encrypt..
$usePrivateKey = 0;
$encryptedStr = $rsa->encryptStringENC($plainText,$usePrivateKey);
print $encryptedStr . "\n";

// -------------------------------------------------
// Now decrypt with the matching private key.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa2 = new COM("Chilkat.Rsa");

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PrivateKey')
$privKey = new COM("Chilkat.PrivateKey");
$success = $privKey->LoadEncryptedPem('qa_data/pem/rsa_passwd.pem','passwd');
if ($success != 1) {
    print $privKey->LastErrorText . "\n";
    exit;
}

$success = $rsa2->ImportPrivateKeyObj($privKey);

// Make sure we have the same settings used for encryption.
$rsa2->OaepPadding = 1;
$rsa2->EncodingMode = 'hex';
$rsa2->OaepHash = 'sha1';

$originalStr = $rsa2->decryptStringENC($encryptedStr,1);

print $originalStr . "\n";

?>