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(.NET Core C#) Get ECC Public Key from ECC Private KeyDemonstrates how to get an ECC public key from an ECC private key.
// We have an ECC private key... // The contents of the private key PEM file look like this: // -----BEGIN PRIVATE KEY----- // MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg3J8q/24D1sEKGdP9 // 72MGYElLGpw/a56Y3t6pfON3uhShRANCAATlSmoizyhAwoYZAOuFBATl07/1RR54 // a1Dzfm16grxJe666AGKR+bSs24hk7TEpaeCTvT8YOOM3l+xKFg7zq6Q9 // -----END PRIVATE KEY----- Chilkat.PrivateKey privKey = new Chilkat.PrivateKey(); bool success = privKey.LoadPemFile("qa_data/ecc/secp256r1-key-pkcs8.pem"); if (success != true) { Debug.WriteLine(privKey.LastErrorText); return; } // Get the public key. Chilkat.PublicKey pubKey = privKey.GetPublicKey(); if (privKey.LastMethodSuccess != true) { Debug.WriteLine(privKey.LastErrorText); return; } // Save the public key to a PEM file. success = pubKey.SavePemFile(false,"qa_data/ecc/secp256r1-pubkey.pem"); if (success != true) { Debug.WriteLine(pubKey.LastErrorText); return; } // The contents of the ECC public key PEM file look like this: // -----BEGIN PUBLIC KEY----- // MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA // AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA//// // ///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd // NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5 // RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA // //////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABOVKaiLPKEDChhkA64UEBOXT // v/VFHnhrUPN+bXqCvEl7rroAYpH5tKzbiGTtMSlp4JO9Pxg44zeX7EoWDvOrpD0= // -----END PUBLIC KEY----- Debug.WriteLine("Success."); |
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