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(Unicode C) Get ECC Public Key from ECC Private KeyDemonstrates how to get an ECC public key from an ECC private key.
#include <C_CkPrivateKeyW.h> #include <C_CkPublicKeyW.h> void ChilkatSample(void) { HCkPrivateKeyW privKey; BOOL success; HCkPublicKeyW pubKey; // 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----- privKey = CkPrivateKeyW_Create(); success = CkPrivateKeyW_LoadPemFile(privKey,L"qa_data/ecc/secp256r1-key-pkcs8.pem"); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkPrivateKeyW_Dispose(privKey); return; } // Get the public key. pubKey = CkPrivateKeyW_GetPublicKey(privKey); if (CkPrivateKeyW_getLastMethodSuccess(privKey) != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkPrivateKeyW_Dispose(privKey); return; } // Save the public key to a PEM file. success = CkPublicKeyW_SavePemFile(pubKey,FALSE,L"qa_data/ecc/secp256r1-pubkey.pem"); if (success != TRUE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubKey)); CkPublicKeyW_Dispose(pubKey); CkPrivateKeyW_Dispose(privKey); 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----- CkPublicKeyW_Dispose(pubKey); wprintf(L"Success.\n"); CkPrivateKeyW_Dispose(privKey); } |
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