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(PHP Extension) ECDSA Sign and Verify Data using Different Hash AlgorithmsDemonstrates how to create ECDSA signatures on data using different hash algorithms. Note: This example requires Chilkat v9.5.0.85 or greater because the SignBd and VerifyBd methods were added in v9.5.0.85.
<?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. // First load an ECDSA private key to be used for signing. $privKey = new CkPrivateKey(); $success = $privKey->LoadEncryptedPemFile('qa_data/ecc/secp256r1-key-pkcs8-secret.pem','secret'); if ($success == false) { print $privKey->lastErrorText() . "\n"; exit; } // Load some data to be signed. $bd = new CkBinData(); $success = $bd->LoadFile('qa_data/hamlet.xml'); if ($success == false) { print 'Failed to load file to be hashed.' . "\n"; exit; } $ecdsa = new CkEcc(); $prng = new CkPrng(); // Sign the sha256 hash of the data. Return the ECDSA signature in the base64 encoding. print 'ECDSA signing the sha256 hash of the data...' . "\n"; $sig = $ecdsa->signBd($bd,'sha256','base64',$privKey,$prng); print 'sig = ' . $sig . "\n"; // Verify the signature against the original data. // (We must use the same hash algorithm that was used when signing.) // Load the public key that corresponds to the private key used for signing. $pubKey = new CkPublicKey(); $success = $pubKey->LoadFromFile('qa_data/ecc/secp256r1-pub.pem'); if ($success == false) { print $pubKey->lastErrorText() . "\n"; exit; } $ecc2 = new CkEcc(); $result = $ecc2->VerifyBd($bd,'sha256',$sig,'base64',$pubKey); if ($result != 1) { print $ecc2->lastErrorText() . "\n"; exit; } print 'Verified!' . "\n"; // ---------------------------------------------------------------------------------------- // Let's do the same thing, but with sha384 hashing... print '--------------------------------------------' . "\n"; print 'ECDSA signing the sha384 hash of the data...' . "\n"; $sig = $ecdsa->signBd($bd,'sha384','base64',$privKey,$prng); print 'sig = ' . $sig . "\n"; $result = $ecc2->VerifyBd($bd,'sha384',$sig,'base64',$pubKey); if ($result != 1) { print $ecc2->lastErrorText() . "\n"; exit; } print 'Verified!' . "\n"; ?> |
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