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(PHP ActiveX) Get Ed25519 Key in Different FormatsDemonstrates how to get/save an Ed25519 private key to different formats. Converting a private key from one format to another is done by loading in one format and saving/getting in another. Note: This example requires Chilkat v9.5.0.83 or greater.
<?php // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.EdDSA') $eddsa = new COM("Chilkat.EdDSA"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Prng') $prng = new COM("Chilkat.Prng"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PrivateKey') $privKey = new COM("Chilkat.PrivateKey"); // Generates a new ed25519 key and stores it in privKey. $success = $eddsa->GenEd25519Key($prng,$privKey); if ($success == 0) { print $eddsa->LastErrorText . "\n"; exit; } // ---------------------------------------------------------- // Ed25519 PKCS1 format // // This is the format created by: openssl genpkey -algorithm X25519 -out xkey.pem $pkcs1Base64 = $privKey->getPkcs1ENC('base64'); print $pkcs1Base64 . "\n"; // Sample output: MC4CAQAwBQYDK2VuBCIEIB1mwirs+eC6XGbkjPIiZyBwQ7768uSd9v5PHOLFbIXo // PKCS1 is a binary ASN.1 DER format. You can examine the contents with two online tools: // 1) Go to ASN.1 Decoder and paste the base64 into the online form. // 2) Or Decode Base64 ASN.1 to XML // The PKCS1 ASN.1 format for an Ed25519 key look like this: // SEQUENCE // INTEGER 0 // SEQUENCE // OBJECT IDENTIFIER 1.3.101.110 curveX25519 (ECDH 25519 key agreement algorithm) // OCTET STRING // OCTET STRING (32 byte) 1D66C... // Save it directly to a file. $success = $privKey->SavePkcs1File('qa_output/ed25519.key'); // ---------------------------------------------------------- // Ed25519 Unencrypted PKCS8 format // // For ed25519, the ASN.1 output is the same as for PKCS1. $pkcs8Base64 = $privKey->getPkcs8ENC('base64'); print $pkcs8Base64 . "\n"; // PKCS8 is a binary ASN.1 DER format. You can examine the contents with two online tools: // 1) Go to ASN.1 Decoder and paste the base64 into the online form. // 2) Or Decode Base64 ASN.1 to XML // ---------------------------------------------------------- // Ed25519 Encrypted PKCS8 format // // Note: The encrypted output cannot be examined using the above online tools because the ASN.1 is encrypted. $password = 'secret'; $pkcs8EncBase64 = $privKey->getPkcs8EncryptedENC('base64',$password); print $pkcs8EncBase64 . "\n"; // ---------------------------------------------------------- // Ed25519 in PEM format: // $ed25519Pem = $privKey->getPkcs1Pem(); print $ed25519Pem . "\n"; // Sample output: // -----BEGIN PRIVATE KEY----- // MC4CAQAwBQYDK2VuBCIEIOKPhbULJagBAi7hbRdn1f4AAzh1RqqCHqCAvau7N6yO // -----END PRIVATE KEY----- // ---------------------------------------------------------- // Ed25519 in JWK Format // $jwk = $privKey->getJwk(); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject') $json = new COM("Chilkat.JsonObject"); $json->Load($jwk); $json->EmitCompact = 0; print $json->emit() . "\n"; // Sample output: // { // "kty": "OKP", // "crv": "Ed25519", // "x": "SE2Kne5xt51z1eciMH2T2ftDQp96Gl6FhY6zSQujiP0", // "d": "O-eRXewadF0sNyB0U9omcnt8Qg2ZmeK3WSXPYgqe570", // "use": "sig" // } // In the above JWK, x is the public key, y is the private key. // Both are 32 bytes and are base64-url encoded. // ---------------------------------------------------------- // Ed25519 in XML Format // $ed25519_xml = $privKey->getXml(); print $ed25519_xml . "\n"; // Sample output: <Ed25519KeyValue>w4b/gI0zgYKgjtfWLjNfc4issmP7Qap84uesYNgEefP/WoY3jNOhOzgTYsMtOnuyGn3MdA4NZtsUXVNI1NiTlA==</Ed25519KeyValue> // The base64 content is composed of the concatenation of the 32-byte private key with the 32-byte public key and then base64 encoded. // In other words: Base64(privKey || pubKey) // ---------------------------------------------------------- // Ed25519 in Raw Hex Format // // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder') $sbPubKeyHex = new COM("Chilkat.StringBuilder"); $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 ?> |
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