(PHP ActiveX) Load RSA Public Key from Hex Modulus and Exponent

Load an RSA public key from a hex modulus and exponent.

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



// Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..
$modulus = 'BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429';

$exponent = '00000003';

// We'll need to re-encode from hex to base64..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bdModulus = new COM("Chilkat.BinData");
$bdModulus->AppendEncoded($modulus,'hex');
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bdExponent = new COM("Chilkat.BinData");
$bdExponent->AppendEncoded($exponent,'hex');

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Xml')
$xml = new COM("Chilkat.Xml");
$xml->Tag = 'RsaKeyValue';
$xml->NewChild2('Modulus',$bdModulus->getEncoded('base64'));
$xml->NewChild2('Exponent',$bdExponent->getEncoded('base64'));

// Now load into the pubkey object..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey')
$pubkey = new COM("Chilkat.PublicKey");
$success = $pubkey->LoadFromString($xml->getXml());
if ($success == 0) {
    print $pubkey->LastErrorText . "\n";
    exit;
}

print 'Success.' . "\n";

?>