(PHP Extension) Ed25519 Sign and Verify

Demonstrates how to create an Ed25519 signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.83 or greater.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?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");

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

$privKeyHex = '1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93';
$pubKeyHex = 'b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde';

$privKey = new CkPrivateKey();
// This example shows only one way of loading an Ed25519 private key.
// Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
// You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
$success = $privKey->LoadEd25519($privKeyHex,$pubKeyHex);
if ($success == false) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// The data to be signed...
$bd = new CkBinData();
$bd->AppendString('Message for Ed25519 signing','utf-8');

$eddsa = new CkEdDSA();
$hexSig = $eddsa->signBdENC($bd,'hexlower',$privKey);

print 'signature = ' . $hexSig . "\n";

// The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

// Verify the signature..
$pubKey = new CkPublicKey();
$success = $pubKey->LoadEd25519($pubKeyHex);
if ($success == false) {
    print $pubKey->lastErrorText() . "\n";
    exit;
}

$bVerified = $eddsa->VerifyBdENC($bd,$hexSig,'hexlower',$pubKey);
if ($bVerified == false) {
    print $eddsa->lastErrorText() . "\n";
    print 'Failed to verify the signature.' . "\n";
    exit;
}

print 'The Ed25519 signature is verified!' . "\n";

?>