(PHP Extension) Ed25519ph Sign and Verify

Demonstrates how to create an Ed25519ph signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.91 or greater.

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<?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.

// Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30

//    -----TEST abc
// 
//    ALGORITHM:
//    Ed25519ph
// 
//    SECRET KEY:
//    833fe62409237b9d62ec77587520911e
//    9a759cec1d19755b7da901b96dca3d42
// 
//    PUBLIC KEY:
//    ec172b93ad5e563bf4932c70e1245034
//    c35467ef2efd4d64ebf819683467e2bf
// 
//    MESSAGE (length 3 bytes):
//    616263
// 
//    SIGNATURE:
//    98a70222f0b8121aa9d30f813d683f80
//    9e462b469c7ff87639499bb94e6dae41
//    31f85042463c2a355a2003d062adf5aa
//    a10b8c61e636062aaad11c2a26083406

$privKeyHex = '833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42';
$pubKeyHex = 'ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf';

$privKey = new CkPrivateKey();
$success = $privKey->LoadEd25519($privKeyHex,$pubKeyHex);
if ($success == false) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// The data to be signed...
$bd = new CkBinData();
$bd->AppendEncoded('616263','hex');

$eddsa = new CkEdDSA();
// Indicate we want the Ed25519ph instance.
$eddsa->put_Algorithm('Ed25519ph');

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

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

// The expected output is: 98a70222f0b8121aa9d30f813d683f80....

// 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 Ed25519ph signature is verified!' . "\n";

?>