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(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 <C_CkPublicKey.h> #include <C_CkByteData.h> #include <C_CkRsa.h> void ChilkatSample(void) { BOOL success; HCkPublicKey pubKey; HCkByteData inData; HCkByteData sigData; HCkRsa rsa; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pubKey = CkPublicKey_Create(); // Load the public key from an PEM file: success = CkPublicKey_LoadFromFile(pubKey,"pubKey.pem"); if (success != TRUE) { printf("%s\n",CkPublicKey_lastErrorText(pubKey)); CkPublicKey_Dispose(pubKey); return; } // Load the data of the original file that was signed. inData = CkByteData_Create(); success = CkByteData_loadFile(inData,"in.dat"); if (success != TRUE) { printf("Failed to load input data.\n"); CkPublicKey_Dispose(pubKey); CkByteData_Dispose(inData); return; } // Load the signature. sigData = CkByteData_Create(); success = CkByteData_loadFile(sigData,"signature.sig"); if (success != TRUE) { printf("Failed to the signature file.\n"); CkPublicKey_Dispose(pubKey); CkByteData_Dispose(inData); CkByteData_Dispose(sigData); return; } rsa = CkRsa_Create(); // Import the public key into the RSA component: success = CkRsa_ImportPublicKeyObj(rsa,pubKey); if (success != TRUE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkPublicKey_Dispose(pubKey); CkByteData_Dispose(inData); CkByteData_Dispose(sigData); CkRsa_Dispose(rsa); return; } // OpenSSL uses big-endian... CkRsa_putLittleEndian(rsa,FALSE); success = CkRsa_VerifyBytes(rsa,inData,"sha256",sigData); if (success != TRUE) { printf("%s\n",CkRsa_lastErrorText(rsa)); printf("The signature was invalid.\n"); CkPublicKey_Dispose(pubKey); CkByteData_Dispose(inData); CkByteData_Dispose(sigData); CkRsa_Dispose(rsa); return; } printf("The signature was verified successfully.\n"); CkPublicKey_Dispose(pubKey); CkByteData_Dispose(inData); CkByteData_Dispose(sigData); CkRsa_Dispose(rsa); } |
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