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(PHP Extension) ECDSA Sign Data and Verify Signature

Demonstrates using the Elliptic Curve Digital Signature Algorithm to hash data and sign it. Also demonstrates how to verify the ECDSA signature.

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

// To create an ECDSA signature, the data first needs to be hashed.  Then the hash
// is signed.

// Use Chilkat Crypt2 to generate a hash for any of the following
// hash algorithms: SHA256, SHA384, SHA512, SHA1, MD5, MD2, HAVAL, RIPEMD128/160/256/320

$crypt = new CkCrypt2();
$crypt->put_HashAlgorithm('SHA256');
$crypt->put_Charset('utf-8');
$crypt->put_EncodingMode('base64');

// Hash a string.
$hash1 = $crypt->hashStringENC('The quick brown fox jumps over the lazy dog');
print 'hash1 = ' . $hash1 . "\n";

// Or hash a file..
$hash2 = $crypt->hashFileENC('qa_data/hamlet.xml');
print 'hash2 = ' . $hash2 . "\n";

// (The Crypt2 API provides many other ways to hash data..)

// -----------------------------------------------------------
// An ECDSA private key is used for signing.  The public key is for signature verification.
// Load our ECC private key.
// Our private key file contains this:

// 	// -----BEGIN PRIVATE KEY-----
// 	MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg3J8q/24D1sEKGdP9
// 	72MGYElLGpw/a56Y3t6pfON3uhShRANCAATlSmoizyhAwoYZAOuFBATl07/1RR54
// 	a1Dzfm16grxJe666AGKR+bSs24hk7TEpaeCTvT8YOOM3l+xKFg7zq6Q9
// 	-----END PRIVATE KEY-----

$privKey = new CkPrivateKey();
$success = $privKey->LoadPemFile('qa_data/ecc/secp256r1-key-pkcs8.pem');
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// We'll need a PRNG source for random number generation.
// Use Chilkat's PRNG (for the Fortuna PRNG algorithm).
$prng = new CkPrng();

// Sign the hash..
$ecdsa = new CkEcc();
$ecdsaSigBase64 = $ecdsa->signHashENC($hash1,'base64',$privKey,$prng);
if ($ecdsa->get_LastMethodSuccess() != true) {
    print $ecdsa->lastErrorText() . "\n";
    exit;
}

print 'ECDSA signature = ' . $ecdsaSigBase64 . "\n";

// -----------------------------------------------------------
// Now let's verify the signature using the public key.

$pubKey = new CkPublicKey();
$success = $pubKey->LoadFromFile('qa_data/ecc/secp256r1-pubkey.pem');
if ($success != true) {
    print $pubKey->lastErrorText() . "\n";
    exit;
}

$result = $ecdsa->VerifyHashENC($hash1,$ecdsaSigBase64,'base64',$pubKey);
if ($result == 1) {
    print 'Signature is valid.' . "\n";
    exit;
}

if ($result == 0) {
    print 'Signature is invalid.' . "\n";
    exit;
}

if ($result < 0) {
    print $ecdsa->lastErrorText() . "\n";
    print 'The VerifyHashENC method call failed.' . "\n";
    exit;
}


?>

 

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