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(C++) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.datDemonstrates how to duplicate this OpenSSL command: openssl dgst -sha256 -sign private.pem -out sha256.sig in.datThe in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
#include <CkPrivateKey.h> #include <CkByteData.h> #include <CkRsa.h> void ChilkatSample(void) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; CkPrivateKey pkey; // Load the private key from an PEM file: success = pkey.LoadPemFile("private.pem"); if (success != true) { std::cout << pkey.lastErrorText() << "\r\n"; return; } // Load the file to be signed. CkByteData inData; success = inData.loadFile("in.dat"); if (success != true) { std::cout << "Failed to load input data." << "\r\n"; return; } CkRsa rsa; // Import the private key into the RSA component: success = rsa.ImportPrivateKeyObj(pkey); if (success != true) { std::cout << rsa.lastErrorText() << "\r\n"; return; } // OpenSSL uses big-endian... rsa.put_LittleEndian(false); CkByteData sigData; success = rsa.SignBytes(inData,"sha256",sigData); if (success != true) { std::cout << rsa.lastErrorText() << "\r\n"; return; } // Save the binary signature to a file. success = sigData.saveFile("signature.sig"); if (success != true) { std::cout << "Failed to save signature file." << "\r\n"; return; } std::cout << "Success." << "\r\n"; } |
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