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C Examples


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(C) Generate an ECC Key (Public and Private)

Demonstrates how to generate an ECC key and save both public and private parts.

Chilkat C/C++ Library Downloads

MS Visual C/C++

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

void ChilkatSample(void)
    {
    HCkPrng fortuna;
    const char *entropy;
    BOOL success;
    HCkEcc ecc;
    HCkPrivateKey privKey;
    HCkPublicKey pubKey;
    BOOL bPreferPkcs1;

    //  This example 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 = CkEcc_GenEccKey(ecc,"secp256r1",fortuna);
    if (privKey == 0 ) {
        printf("%s\n",CkEcc_lastErrorText(ecc));
        CkPrng_Dispose(fortuna);
        CkEcc_Dispose(ecc);
        return;
    }

    //  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","qa_output/eccPrivKey.pem");
    if (success != TRUE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
    }

    CkPrivateKey_Dispose(privKey);

    //  The private key PEM looks like this:

    //  	-----BEGIN ENCRYPTED PRIVATE KEY-----
    //  	MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAhUmn+1/lwCIwICCAAw
    //  	FAYIKoZIhvcNAwcECPlyNXAXZO+oBIGAIvxvTENXJWbrCwSjh0QNxLecBotUpfI5
    //  	auOonLmwVMyt1ahMmNyVo/D+pnKQSE41Fg8fApM0DCDKZUOVCCcK1qirIsMPQkGp
    //  	klPJbvrQRVYgzBtU31uNB5y2wqhrIeepal1HXBvbkUK0nfJMbcdz/XAEIQu2HhTD
    //  	t6LMScPQld4=
    //  	-----END ENCRYPTED PRIVATE KEY-----

    //  Now get the public key part from the private key.
    //  (A public key is actually a subset of the private key.)
    pubKey = CkPrivateKey_GetPublicKey(privKey);

    //  Save the public key to a PEM file.
    //  (The public key can be saved in a variety of different formats. See the online reference documentation.)
    //  For ECC keys, the 1st argument (bPreferPkcs1) is ignored and unused.
    bPreferPkcs1 = FALSE;
    success = CkPublicKey_SavePemFile(pubKey,bPreferPkcs1,"qa_output/eccPubKey.pem");

    CkPublicKey_Dispose(pubKey);

    //  The public key PEM looks like this:

    //  	-----BEGIN PUBLIC KEY-----
    //  	MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
    //  	AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
    //  	///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
    //  	NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
    //  	RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
    //  	//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABGdOH8uM6SfX3mdV+TR0mWp2
    //  	gfVRPlxWxwhOiowuNByBxmQz7ZR4CJY1XcN2zkUo5pzW73ZhGwgd2XTOvqPqG40=
    //  	-----END PUBLIC KEY-----
    // 

    printf("finished.\n");


    CkPrng_Dispose(fortuna);
    CkEcc_Dispose(ecc);

    }

 

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