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(Objective-C) Generate an ECC Key (Public and Private)Demonstrates how to generate an ECC key and save both public and private parts.
#import <CkoPrng.h> #import <NSString.h> #import <CkoEcc.h> #import <CkoPrivateKey.h> #import <CkoPublicKey.h> // 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. CkoPrng *fortuna = [[CkoPrng alloc] init]; NSString *entropy = [fortuna GetEntropy: [NSNumber numberWithInt: 32] encoding: @"base64"]; BOOL success = [fortuna AddEntropy: entropy encoding: @"base64"]; CkoEcc *ecc = [[CkoEcc alloc] init]; // Generate a random ECC private key on the secp256r1 curve. // Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256k1. CkoPrivateKey *privKey = [ecc GenEccKey: @"secp256r1" prng: fortuna]; if (ecc.LastMethodSuccess == NO) { NSLog(@"%@",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" path: @"qa_output/eccPrivKey.pem"]; if (success != YES) { NSLog(@"%@",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.) CkoPublicKey *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 = NO; success = [pubKey SavePemFile: bPreferPkcs1 path: @"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----- // NSLog(@"%@",@"finished."); |
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