PHP ActiveX Requires Chilkat v11.0.0+

Get EC Public Key from EC Private Key

See more ECC Examples

Demonstrates how to get an EC public key from an EC private key. PHP ActiveX

<?php

$success = 0;

//  We have an ECC private key...
//  The contents of the private key PEM file look like this:

//  	-----BEGIN PRIVATE KEY-----
//  	MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg3J8q/24D1sEKGdP9
//  	72MGYElLGpw/a56Y3t6pfON3uhShRANCAATlSmoizyhAwoYZAOuFBATl07/1RR54
//  	a1Dzfm16grxJe666AGKR+bSs24hk7TEpaeCTvT8YOOM3l+xKFg7zq6Q9
//  	-----END PRIVATE KEY-----

$privKey = new COM("Chilkat.PrivateKey");
$success = $privKey->LoadPemFile('qa_data/ecc/secp256r1-key-pkcs8.pem');
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

//  Get the public key.
$pubKey = new COM("Chilkat.PublicKey");
$privKey->ToPublicKey($pubKey);

//  Save the public key to a PEM file.
$success = $pubKey->SavePemFile(0,'qa_data/ecc/secp256r1-pubkey.pem');
if ($success == 0) {
    print $pubKey->LastErrorText . "\n";
    exit;
}

//  The contents of the ECC public key PEM file look like this:

//  	-----BEGIN PUBLIC KEY-----
//  	MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
//  	AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
//  	///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
//  	NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
//  	RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
//  	//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABOVKaiLPKEDChhkA64UEBOXT
//  	v/VFHnhrUPN+bXqCvEl7rroAYpH5tKzbiGTtMSlp4JO9Pxg44zeX7EoWDvOrpD0=
//  	-----END PUBLIC KEY-----

print 'Success.' . "\n";

?>