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(Unicode C++) Duplicate openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.datDemonstrates how to duplicate this OpenSSL command: openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.datThe in.dat file contains the original data that was signed, and can contain text or binary data of any type. The above OpenSSL command does the following:
#include <CkPublicKeyW.h> #include <CkByteData.h> #include <CkRsaW.h> void ChilkatSample(void) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; CkPublicKeyW pubKey; // Load the public key from an PEM file: success = pubKey.LoadFromFile(L"pubKey.pem"); if (success != true) { wprintf(L"%s\n",pubKey.lastErrorText()); return; } // Load the data of the original file that was signed. CkByteData inData; success = inData.loadFile(L"in.dat"); if (success != true) { wprintf(L"Failed to load input data.\n"); return; } // Load the signature. CkByteData sigData; success = sigData.loadFile(L"signature.sig"); if (success != true) { wprintf(L"Failed to the signature file.\n"); return; } CkRsaW rsa; // Import the public key into the RSA component: success = rsa.ImportPublicKeyObj(pubKey); if (success != true) { wprintf(L"%s\n",rsa.lastErrorText()); return; } // OpenSSL uses big-endian... rsa.put_LittleEndian(false); success = rsa.VerifyBytes(inData,L"sha256",sigData); if (success != true) { wprintf(L"%s\n",rsa.lastErrorText()); wprintf(L"The signature was invalid.\n"); return; } wprintf(L"The signature was verified successfully.\n"); } |
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