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(Unicode C) 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.
#include <C_CkEdDSAW.h> #include <C_CkPrngW.h> #include <C_CkPrivateKeyW.h> #include <C_CkJsonObjectW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { HCkEdDSAW eddsa; HCkPrngW prng; HCkPrivateKeyW privKey; BOOL success; const wchar_t *pkcs1Base64; const wchar_t *pkcs8Base64; const wchar_t *password; const wchar_t *pkcs8EncBase64; const wchar_t *ed25519Pem; const wchar_t *jwk; HCkJsonObjectW json; const wchar_t *ed25519_xml; HCkStringBuilderW sbPubKeyHex; const wchar_t *privKeyHex; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. eddsa = CkEdDSAW_Create(); prng = CkPrngW_Create(); privKey = CkPrivateKeyW_Create(); // Generates a new ed25519 key and stores it in privKey. success = CkEdDSAW_GenEd25519Key(eddsa,prng,privKey); if (success == FALSE) { wprintf(L"%s\n",CkEdDSAW_lastErrorText(eddsa)); CkEdDSAW_Dispose(eddsa); CkPrngW_Dispose(prng); CkPrivateKeyW_Dispose(privKey); return; } // ---------------------------------------------------------- // Ed25519 PKCS1 format // // This is the format created by: openssl genpkey -algorithm X25519 -out xkey.pem pkcs1Base64 = CkPrivateKeyW_getPkcs1ENC(privKey,L"base64"); wprintf(L"%s\n",pkcs1Base64); // 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 = CkPrivateKeyW_SavePkcs1File(privKey,L"qa_output/ed25519.key"); // ---------------------------------------------------------- // Ed25519 Unencrypted PKCS8 format // // For ed25519, the ASN.1 output is the same as for PKCS1. pkcs8Base64 = CkPrivateKeyW_getPkcs8ENC(privKey,L"base64"); wprintf(L"%s\n",pkcs8Base64); // 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 = L"secret"; pkcs8EncBase64 = CkPrivateKeyW_getPkcs8EncryptedENC(privKey,L"base64",password); wprintf(L"%s\n",pkcs8EncBase64); // ---------------------------------------------------------- // Ed25519 in PEM format: // ed25519Pem = CkPrivateKeyW_getPkcs1Pem(privKey); wprintf(L"%s\n",ed25519Pem); // Sample output: // -----BEGIN PRIVATE KEY----- // MC4CAQAwBQYDK2VuBCIEIOKPhbULJagBAi7hbRdn1f4AAzh1RqqCHqCAvau7N6yO // -----END PRIVATE KEY----- // ---------------------------------------------------------- // Ed25519 in JWK Format // jwk = CkPrivateKeyW_getJwk(privKey); json = CkJsonObjectW_Create(); CkJsonObjectW_Load(json,jwk); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); // 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 = CkPrivateKeyW_getXml(privKey); wprintf(L"%s\n",ed25519_xml); // 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 // sbPubKeyHex = CkStringBuilderW_Create(); privKeyHex = CkPrivateKeyW_getRawHex(privKey,sbPubKeyHex); // We should have a 32-byte private key (a 64 character hex string). wprintf(L"private key = %s\n",privKeyHex); // We should have a 32-byte public key (a 64 character hex string). wprintf(L"public key = %s\n",CkStringBuilderW_getAsString(sbPubKeyHex)); // Sample output: // key type = ed25519 // size in bits = 256 // private key = d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842 // public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1 CkEdDSAW_Dispose(eddsa); CkPrngW_Dispose(prng); CkPrivateKeyW_Dispose(privKey); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbPubKeyHex); } |
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