(PHP ActiveX) 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 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

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

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PrivateKey')
$privKey = new COM("Chilkat.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.
$success = $privKey->LoadEd25519($privKeyHex,$pubKeyHex);
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

// The data to be signed...
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bd = new COM("Chilkat.BinData");
$bd->AppendString('Message for Ed25519 signing','utf-8');

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.EdDSA')
$eddsa = new COM("Chilkat.EdDSA");
$hexSig = $eddsa->signBdENC($bd,'hexlower',$privKey);

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

// The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

// Verify the signature..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey')
$pubKey = new COM("Chilkat.PublicKey");
$success = $pubKey->LoadEd25519($pubKeyHex);
if ($success == 0) {
    print $pubKey->LastErrorText . "\n";
    exit;
}

$bVerified = $eddsa->VerifyBdENC($bd,$hexSig,'hexlower',$pubKey);
if ($bVerified == 0) {
    print $eddsa->LastErrorText . "\n";
    print 'Failed to verify the signature.' . "\n";
    exit;
}

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

?>