(C) Generate an ECDSA Key

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Note: This example requires Chilkat v11.0.0 or greater.

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#include <C_CkPrng.h>
#include <C_CkEcc.h>
#include <C_CkPrivateKey.h>

void ChilkatSample(void)
    {
    HCkPrng fortuna;
    const char *entropy;
    BOOL success;
    HCkEcc ecc;
    HCkPrivateKey privKey;

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // 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 = CkPrng_Create();
    entropy = CkPrng_getEntropy(fortuna,32,"base64");
    success = CkPrng_AddEntropy(fortuna,entropy,"base64");

    ecc = CkEcc_Create();

    // Generate a random ECC private key on the secp256r1 curve.
    // Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256k1.

    privKey = CkPrivateKey_Create();
    success = CkEcc_GenKey(ecc,"secp256r1",fortuna,privKey);
    if (success != TRUE) {
        printf("%s\n",CkEcc_lastErrorText(ecc));
        CkPrng_Dispose(fortuna);
        CkEcc_Dispose(ecc);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    printf("%s\n",CkPrivateKey_getXml(privKey));

    // Save the private key to PKCS8 encrypted PEM
    // (The private key can be saved in a variety of different formats. See the online reference documentation.)
    success = CkPrivateKey_SavePkcs8EncryptedPemFile(privKey,"pemPassword","myPemFiles/eccKey123.pem");
    if (success != TRUE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
    }

    printf("finished.\n");


    CkPrng_Dispose(fortuna);
    CkEcc_Dispose(ecc);
    CkPrivateKey_Dispose(privKey);

    }