(PHP Extension) Get an Ed25519 Key in Raw Hex Format

Demonstrates how to get the private and public key parts of an Ed25519 key in lowercase hex formmat.

Note: This example requires Chilkat v9.5.0.83 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.

// Load an Ed25519 key from some format..
$privKey = new CkPrivateKey();

// This loads an Ed25519 key from an unencrypted PEM file (no password required).
$success = $privKey->LoadAnyFormatFile('qa_data/eddsa/ed25519.pem','');
if ($success == false) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// The key type should be "ed25519" to indicate an Ed25519 key.
print 'key type = ' . $privKey->keyType() . "\n";

// What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
print 'size in bits = ' . $privKey->get_BitLength() . "\n";

// Get the private and public key parts in raw hex format:
$sbPubKeyHex = new CkStringBuilder();
$privKeyHex = $privKey->getRawHex($sbPubKeyHex);

// We should have a 32-byte private key (a 64 character hex string).
print 'private key = ' . $privKeyHex . "\n";

// We should have a 32-byte public key (a 64 character hex string).
print 'public key = ' . $sbPubKeyHex->getAsString() . "\n";

// Sample output:
// key type = ed25519
// size in bits = 256
// private key = d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842
// public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1

?>