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

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

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

// 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.
Chilkat.Prng fortuna = new Chilkat.Prng();
string entropy = fortuna.GetEntropy(32,"base64");
bool success = fortuna.AddEntropy(entropy,"base64");

Chilkat.Ecc ecc = new Chilkat.Ecc();

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

Chilkat.PrivateKey privKey = ecc.GenEccKey("secp256r1",fortuna);
if (ecc.LastMethodSuccess == false) {
    Debug.WriteLine(ecc.LastErrorText);
    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 = privKey.SavePkcs8EncryptedPemFile("pemPassword","qa_output/eccPrivKey.pem");
if (success != true) {
    Debug.WriteLine(privKey.LastErrorText);
}

// 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.)
Chilkat.PublicKey pubKey = privKey.GetPublicKey();

// 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.
bool bPreferPkcs1 = false;
success = pubKey.SavePemFile(bPreferPkcs1,"qa_output/eccPubKey.pem");

// 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-----
// 

Debug.WriteLine("finished.");