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PHP Extension Examples

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(PHP Extension) Generate RSA Key and Export to PKCS1 / PKCS8

PHP Extension example code showing how to generate an RSA public/private key and save to PKCS1 and PKCS8 format files. In a PKCS1 or PKCS8 formatted file, the key is stored in binary ASN.1 format (and ASN.1 is itself written according to DER -- Distinguished Encoding Rules). A PEM file simply contains the binary ASN.1 base64 encoded and delimited by BEGIN/END lines. PKCS1 format files are never encrypted. PKCS8 can be encrypted or unencrypted. Public keys are never encrypted (there is no need). Private keys *should* always be encrypted - unless perhaps the unencrypted private key is obtained and itself stored in some sort of secure place.

Chilkat PHP Downloads

PHP Extension for Windows, Linux, MAC OS X,
Alpine Linux, Solaris, OpenBSD, FreeBSD,
and Linux armhf/aarch64

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

$rsa = new CkRsa();

$success = $rsa->UnlockComponent('Anything for 30-day trial');
if ($success != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

//  Generate a 2048-bit key.  Chilkat RSA supports
//  key sizes ranging from 512 bits to 8192 bits.
$success = $rsa->GenerateKey(2048);
if ($success != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

//  Get the public and private key parts:
// pubKey is a CkPublicKey
$pubKey = $rsa->ExportPublicKeyObj();
// privKey is a CkPrivateKey
$privKey = $rsa->ExportPrivateKeyObj();

//  Get the public key as a PKCS8 PEM string
$pubKeyPem = $pubKey->getOpenSslPem();
print $pubKeyPem . "\n";

//  Get the public key in PKCS8 format, in a Base64 encoded string.
$pubKeyPkcs8Base64 = $pubKey->getPkcs8ENC('base64');
print $pubKeyPkcs8Base64 . "\n";

//  Get the public key in PKCS1 format, in a Base64 encoded string.
$pubKeyPkcs1Base64 = $pubKey->getPkcs1ENC('base64');
print $pubKeyPkcs1Base64 . "\n";

//  Get the private key in a PKCS8 PEM string.
$privKeyPem = $privKey->getPkcs8Pem();
print $privKeyPem . "\n";

//  Get the private key in a PKCS8 encrypted PEM string.
$privKeyEncPem = $privKey->getPkcs8EncryptedPem('myPassword');
print $privKeyEncPem . "\n";

//  Get the private key in PKCS1 Base64 format
$privKeyPkcs1Base64 = $privKey->getPkcs1ENC('base64');
print $privKeyPkcs1Base64 . "\n";

//  Get the private key in PKCS8 Base64 format
$privKeyPkcs8Base64 = $privKey->getPkcs8ENC('base64');
print $privKeyPkcs8Base64 . "\n";

//  Save to PKCS1 / PKCS8 / PEM files...

//  Save the public key to PKCS8 binary DER
//  Note: Chilkat is confusingly using the substring "OpenSsl" in the method name.
//  A better choice would've been "SavePkcs8DerFile". When you see "OpenSsl" referring to
//  a key format in a Chilkat method name, assume "PKCS8".
$success = $pubKey->SaveOpenSslDerFile('pubKey_pkcs8.der');

//  Save the public key to PKCS1 binary DER
$success = $pubKey->SaveRsaDerFile('pubKey_pkcs1.der');

//  Save the private key to unencrypted binary PKCS1 DER.
//  Note: PKCS1 is never found in an encrypted format.
$success = $privKey->SaveRsaDerFile('privKey_pkcs1.der');

//  Save the private key to unencrypted binary PKCS8
$success = $privKey->SavePkcs8File('privKey_pkcs8.der');

//  Save the private key to encrypted binary PKCS8
$success = $privKey->SavePkcs8EncryptedFile('myPassword','privKey_enc_pkcs8.der');

//  Save the private key to unencrypted PKCS8 PEM
$success = $privKey->SavePkcs8PemFile('privKey.pem');

//  Save the private key to encrypted PKCS8 PEM
$success = $privKey->SavePkcs8EncryptedPemFile('myPassword','privKey_enc.pem');


?>

 

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