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(MFC) 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 <CkPublicKey.h> #include <CkByteData.h> #include <CkRsa.h> void ChilkatSample(void) { CkString strOut; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; CkPublicKey pubKey; // Load the public key from an PEM file: success = pubKey.LoadOpenSslPemFile("pubKey.pem"); if (success != true) { strOut.append(pubKey.lastErrorText()); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } // Load the data of the original file that was signed. CkByteData inData; success = inData.loadFile("in.dat"); if (success != true) { strOut.append("Failed to load input data."); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } // Load the signature. CkByteData sigData; success = sigData.loadFile("signature.sig"); if (success != true) { strOut.append("Failed to the signature file."); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } CkRsa rsa; // Import the public key into the RSA component: success = rsa.ImportPublicKeyObj(pubKey); if (success != true) { strOut.append(rsa.lastErrorText()); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } // OpenSSL uses big-endian... rsa.put_LittleEndian(false); success = rsa.VerifyBytes(inData,"sha256",sigData); if (success != true) { strOut.append(rsa.lastErrorText()); strOut.append("\r\n"); strOut.append("The signature was invalid."); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } strOut.append("The signature was verified successfully."); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); } |
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