PHP

Ed25519 Sign and Verify

See more Ed25519 Examples

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

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

Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\EdDSA;
use Chilkat2\PrivateKey;
use Chilkat2\PublicKey;

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

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

$privKey = new PrivateKey();
// 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.
try {
    $privKey->LoadEd25519($privKeyHex, $pubKeyHex);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

$eddsa = new EdDSA();
$hexSig = $eddsa->SignBdENC($bd, 'hexlower', $privKey);

echo 'signature = ', $hexSig, "\n";

// The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

// Verify the signature..
$pubKey = new PublicKey();
try {
    $pubKey->LoadEd25519($pubKeyHex);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

try {
    $eddsa->VerifyBdENC($bd, $hexSig, 'hexlower', $pubKey);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    echo "Failed to verify the signature.\n";
    exit;
}

echo "The Ed25519 signature is verified!\n";