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(Unicode 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 <C_CkPrivateKeyW.h> #include <C_CkByteData.h> #include <C_CkRsaW.h> void ChilkatSample(void) { BOOL success; HCkPrivateKeyW pkey; HCkByteData inData; HCkRsaW rsa; HCkByteData sigData; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pkey = CkPrivateKeyW_Create(); // Load the private key from an PEM file: success = CkPrivateKeyW_LoadPemFile(pkey,L"private.pem"); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(pkey)); CkPrivateKeyW_Dispose(pkey); return; } // Load the file to be signed. inData = CkByteData_Create(); success = CkByteData_loadFile(inData,L"in.dat"); if (success != TRUE) { wprintf(L"Failed to load input data.\n"); CkPrivateKeyW_Dispose(pkey); CkByteData_Dispose(inData); return; } rsa = CkRsaW_Create(); // Import the private key into the RSA component: success = CkRsaW_ImportPrivateKeyObj(rsa,pkey); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrivateKeyW_Dispose(pkey); CkByteData_Dispose(inData); CkRsaW_Dispose(rsa); return; } // OpenSSL uses big-endian... CkRsaW_putLittleEndian(rsa,FALSE); sigData = CkByteData_Create(); success = CkRsaW_SignBytes(rsa,inData,L"sha256",sigData); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrivateKeyW_Dispose(pkey); CkByteData_Dispose(inData); CkRsaW_Dispose(rsa); CkByteData_Dispose(sigData); return; } // Save the binary signature to a file. success = CkByteData_saveFile(sigData,L"signature.sig"); if (success != TRUE) { wprintf(L"Failed to save signature file.\n"); CkPrivateKeyW_Dispose(pkey); CkByteData_Dispose(inData); CkRsaW_Dispose(rsa); CkByteData_Dispose(sigData); return; } wprintf(L"Success.\n"); CkPrivateKeyW_Dispose(pkey); CkByteData_Dispose(inData); CkRsaW_Dispose(rsa); CkByteData_Dispose(sigData); } |
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