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(PHP ActiveX) ECDSA Sign and VerifyDemonstrates how to create an ECDSA signature on the SHA256 hash of some data, and then verify.
<?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. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PrivateKey') $privKey = new COM("Chilkat.PrivateKey"); $success = $privKey->LoadEncryptedPemFile('qa_data/ecc/secp256r1-key-pkcs8-secret.pem','secret'); if ($success == 0) { print $privKey->LastErrorText . "\n"; exit; } // Sign the SHA256 hash of some data. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData') $bd = new COM("Chilkat.BinData"); $success = $bd->LoadFile('qa_data/hamlet.xml'); if ($success == 0) { print 'Failed to load file to be hashed.' . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2') $crypt = new COM("Chilkat.Crypt2"); $crypt->HashAlgorithm = 'sha256'; $crypt->EncodingMode = 'base64'; $hashStr = $crypt->hashBdENC($bd); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Ecc') $ecdsa = new COM("Chilkat.Ecc"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Prng') $prng = new COM("Chilkat.Prng"); // Returns ASN.1 signature as a base64 string. $sig = $ecdsa->signHashENC($hashStr,'base64',$privKey,$prng); print 'sig = ' . $sig . "\n"; // The signature is in ASN.1 format (which may be described as the "encoded DSS signature"). // SEQUENCE (2 elem) // INTEGER (255 bit) 4849395540832462044300553275435608522154141569743642905628579547100940... // INTEGER (255 bit) 3680701124244788134409868118208591399799457104230118295614152238560005... // If you wish, you can get the r and s components of the signature like this: // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Asn') $asn = new COM("Chilkat.Asn"); $asn->LoadEncoded($sig,'base64'); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Xml') $xml = new COM("Chilkat.Xml"); $xml->LoadXml($asn->asnToXml()); print $xml->getXml() . "\n"; // We now have this: // <?xml version="1.0" encoding="utf-8"?> // <sequence> // <int>6650D422D86BA4A228B5617604E59052591B9B2C32EF324C44D09EF67E5F0060</int> // <int>0CFD9F6AC85042FC70F672C141BA6B2A4CAFBB906C3D907BCCC1BED62B28326F</int> // </sequence> // Get the "r" and "s" as hex strings $r = $xml->getChildContentByIndex(0); $s = $xml->getChildContentByIndex(1); print 'r = ' . $r . "\n"; print 's = ' . $s . "\n"; // -------------------------------------------------------------------- // Now verify against the hash of the original data. // Get the corresponding public key. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey') $pubKey = new COM("Chilkat.PublicKey"); $success = $pubKey->LoadFromFile('qa_data/ecc/secp256r1-pub.pem'); if ($success == 0) { print $pubKey->LastErrorText . "\n"; exit; } // We already have the SHA256 hash of the original data (hashStr) so no need to re-do it.. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Ecc') $ecc2 = new COM("Chilkat.Ecc"); $result = $ecc2->VerifyHashENC($hashStr,$sig,'base64',$pubKey); if ($result != 1) { print $ecc2->LastErrorText . "\n"; exit; } print 'Verified!' . "\n"; // Note: If we have only r,s and wish to reconstruct the ASN.1 signature, we do it like this: // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Xml') $xml2 = new COM("Chilkat.Xml"); $xml2->Tag = 'sequence'; $xml2->NewChild2('int',$r); $xml2->NewChild2('int',$s); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Asn') $asn2 = new COM("Chilkat.Asn"); $asn2->LoadAsnXml($xml2->getXml()); $encodedSig = $asn2->getEncodedDer('base64'); print 'encoded DSS signature: ' . $encodedSig . "\n"; // You can go to https://lapo.it/asn1js/ and copy/paste the base64 encodedSig into the online tool, then press the "decode" button. // You will see the ASN.1 such as this: // SEQUENCE (2 elem) // INTEGER (255 bit) 4849395540832462044300553275435608522154141569743642905628579547100940... // INTEGER (255 bit) 3680701124244788134409868118208591399799457104230118295614152238560005... ?> |
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