PHP Extension

RSA Encrypt Hash using SHA256 hash function and SHA1 mask function

See more RSA Examples

How can this Javascript be duplicated using Chilkat?

function a(e, t) {
                var r = s.pki.publicKeyFromPem(e)
                  , n = r.encrypt(t, "RSA-OAEP", {
                    md: s.md.sha256.create(),
                    mgf1: {
                        md: s.md.sha1.create()
                    }
                });
                return s.util.encode64(n)
            }

Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, even using the same data and key, the result will be different -- but still valid. One should not expect to get the same output.

PHP Extension

<?php

include("chilkat.php");

$success = false;

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

$pubkey = new CkPublicKey();

$sbPem = new CkStringBuilder();
$bCrlf = true;
$sbPem->AppendLine('-----BEGIN PUBLIC KEY-----',$bCrlf);
$sbPem->AppendLine('MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF',$bCrlf);
$sbPem->AppendLine('3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA',$bCrlf);
$sbPem->AppendLine('04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s',$bCrlf);
$sbPem->AppendLine('Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF',$bCrlf);
$sbPem->AppendLine('wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE',$bCrlf);
$sbPem->AppendLine('f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W',$bCrlf);
$sbPem->AppendLine('SwIDAQAB',$bCrlf);
$sbPem->AppendLine('-----END PUBLIC KEY-----',$bCrlf);

// Load the public key object from the PEM. 
$success = $pubkey->LoadFromString($sbPem->getAsString());
if ($success == false) {
    print $pubkey->lastErrorText() . "\n";
    exit;
}

$originalData = 'This is the original data to be SHA-256 hashed and RSA encrypted.';

// First we SHA-256 hash the original data to get the hash in base64 format:
$crypt = new CkCrypt2();
$crypt->put_HashAlgorithm('SHA-256');
$crypt->put_EncodingMode('base64');
$hashBase64 = $crypt->hashStringENC($originalData);

// Setup RSA to use OAEP padding with SHA-1 for the mask function.
$rsa = new CkRsa();
$rsa->put_PkcsPadding(false);
$rsa->put_OaepHash('SHA256');
$rsa->UsePublicKey($pubkey);
$rsa->put_EncodingMode('base64');

// We can provide a binary encoding mode, such as "base64", "hex", "base64url", etc.
// for the Charset property.   The Charset property was previously limited to character encodings, such as
// "utf-8", "iso-8859-1", etc.  If a binary encoding is used, then the string passed in is decoded to the binary
// bytes as indicated.  (If an actual charset, such as "utf-8" is used, then the input string is converted to the
// byte representation of the charset, and then encrypted.)

// Given that a hash is composed of non-text binary bytes, we'll set the Charset property equal to "base64" 
// (because we have the base64 hash from above).
$rsa->put_Charset('base64');

// Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens,
// even using the same data and key, the result will be different --  but still valid.  One should not expect
// to get the same output.
$bUsePrivateKey = false;
$encryptedStr = $rsa->encryptStringENC($hashBase64,$bUsePrivateKey);
if ($rsa->get_LastMethodSuccess() == false) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

print 'Base64 RSA encrypted output: ' . $encryptedStr . "\n";

?>