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(Unicode C) Get an EC Key in Raw Hex FormatDemonstrates how to get the private and public key parts of an EC (ECDSA) key in lowercase hex formmat. Note: This example requires Chilkat v9.5.0.83 or greater.
#include <C_CkPrivateKeyW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { HCkPrivateKeyW privKey; BOOL success; HCkStringBuilderW sbPubKeyHex; const wchar_t *privKeyHex; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Load an EC key from some format.. privKey = CkPrivateKeyW_Create(); // This loads an ECDSA key from an unencrypted PEM file (no password required). success = CkPrivateKeyW_LoadAnyFormatFile(privKey,L"qa_data/ecc/openssl_ecc_privKey.pem",L""); if (success == FALSE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkPrivateKeyW_Dispose(privKey); return; } // The key type should be "ecc" to indicate an EC key. wprintf(L"key type = %s\n",CkPrivateKeyW_keyType(privKey)); // What is the size of the private key in bits? wprintf(L"size in bits = %d\n",CkPrivateKeyW_getBitLength(privKey)); // Get the private and public EC key parts in raw hex format: sbPubKeyHex = CkStringBuilderW_Create(); privKeyHex = CkPrivateKeyW_getRawHex(privKey,sbPubKeyHex); // If the private key size in bits is 256, then we should have a 32-byte key (a 64 character hex string). wprintf(L"private key = %s\n",privKeyHex); // The public key is composed of the "x" and "y" parts, and is composed like this: 04||HEX(x)||HEX(y) wprintf(L"public key = %s\n",CkStringBuilderW_getAsString(sbPubKeyHex)); // Sample output: // key type = ecc // size in bits = 256 // private key = ced36f2ba3332be439f79143d69937fc52494cd38e45243c3ea05db183919f1b // public key = 045b4edcd501831740895f5907feabb71587076a6314d9d5141f9f8c33a478b8ce08b8dfd2a091eb6355803d7e729876c790bc0b176f2015f3bb103813753f676a CkPrivateKeyW_Dispose(privKey); CkStringBuilderW_Dispose(sbPubKeyHex); } |
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