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(Unicode C) Generate ECDSA Key and Get Details as XMLDemonstrates how to generate an ECC key and gets the parts as XML.
#include <C_CkEccW.h> #include <C_CkPrngW.h> #include <C_CkPrivateKeyW.h> #include <C_CkAsnW.h> #include <C_CkXmlW.h> #include <C_CkCrypt2W.h> void ChilkatSample(void) { HCkEccW ecc; HCkPrngW fortuna; const wchar_t *entropy; BOOL success; HCkPrivateKeyW privKey; HCkAsnW asn; HCkXmlW xml; HCkCrypt2W crypt; const wchar_t *privKeyHex; // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. ecc = CkEccW_Create(); // Generate a random ECC private key on the secp256k1 curve. // Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256r1. // Create a Fortuna PRNG and seed it with system entropy. // This will be our source of random data for generating the ECC private key. fortuna = CkPrngW_Create(); entropy = CkPrngW_getEntropy(fortuna,32,L"base64"); success = CkPrngW_AddEntropy(fortuna,entropy,L"base64"); privKey = CkEccW_GenEccKey(ecc,L"secp256k1",fortuna); if (CkEccW_getLastMethodSuccess(ecc) != TRUE) { wprintf(L"%s\n",CkEccW_lastErrorText(ecc)); CkEccW_Dispose(ecc); CkPrngW_Dispose(fortuna); return; } // An EC private key has this ASN.1 // ECPrivateKey ::= SEQUENCE { // version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), // privateKey OCTET STRING, // parameters [0] ECParameters {{ NamedCurve }} OPTIONAL, // publicKey [1] BIT STRING OPTIONAL (This is the ANSI X9.63 public key format.) asn = CkAsnW_Create(); success = CkAsnW_LoadEncoded(asn,CkPrivateKeyW_getPkcs1ENC(privKey,L"base64"),L"base64"); if (success != TRUE) { wprintf(L"%s\n",CkAsnW_lastErrorText(asn)); CkEccW_Dispose(ecc); CkPrngW_Dispose(fortuna); CkAsnW_Dispose(asn); return; } xml = CkXmlW_Create(); CkXmlW_LoadXml(xml,CkAsnW_asnToXml(asn)); wprintf(L"%s\n",CkXmlW_getXml(xml)); // The XML looks like this: // <?xml version="1.0" encoding="utf-8" ?> // <sequence> // <int>01</int> // <octets>JgJvBG+3wletkJab8iXAkpz0O8/AgWZSpkYVcB7SpnU=</octets> // <contextSpecific tag="0" constructed="1"> // <oid>1.3.132.0.10</oid> // </contextSpecific> // </sequence> // The 32-byte private key is in the octets.. // Get it as hex. crypt = CkCrypt2W_Create(); privKeyHex = CkCrypt2W_reEncode(crypt,CkXmlW_getChildContent(xml,L"octets"),L"base64",L"hex"); wprintf(L"EC private key as hex = %s\n",privKeyHex); CkPrivateKeyW_Dispose(privKey); CkEccW_Dispose(ecc); CkPrngW_Dispose(fortuna); CkAsnW_Dispose(asn); CkXmlW_Dispose(xml); CkCrypt2W_Dispose(crypt); } |
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