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(DataFlex) Get EC Public Key from EC Private KeyDemonstrates how to get an EC public key from an EC private key. Note: This example requires Chilkat v11.0.0 or greater.
Use ChilkatAx-win32.pkg Procedure Test Boolean iSuccess Handle hoPrivKey Variant vPubKey Handle hoPubKey String sTemp1 Move False To iSuccess // 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----- Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey If (Not(IsComObjectCreated(hoPrivKey))) Begin Send CreateComObject of hoPrivKey End Get ComLoadPemFile Of hoPrivKey "qa_data/ecc/secp256r1-key-pkcs8.pem" To iSuccess If (iSuccess = False) Begin Get ComLastErrorText Of hoPrivKey To sTemp1 Showln sTemp1 Procedure_Return End // Get the public key. Get Create (RefClass(cComChilkatPublicKey)) To hoPubKey If (Not(IsComObjectCreated(hoPubKey))) Begin Send CreateComObject of hoPubKey End Get pvComObject of hoPubKey to vPubKey Get ComToPublicKey Of hoPrivKey vPubKey To iSuccess // Save the public key to a PEM file. Get ComSavePemFile Of hoPubKey False "qa_data/ecc/secp256r1-pubkey.pem" To iSuccess If (iSuccess = False) Begin Get ComLastErrorText Of hoPubKey To sTemp1 Showln sTemp1 Procedure_Return End // 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----- Showln "Success." End_Procedure |
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