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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 <C_CkPrivateKey.h> #include <C_CkByteData.h> #include <C_CkRsa.h> void ChilkatSample(void) { BOOL success; HCkPrivateKey pkey; HCkByteData inData; HCkRsa rsa; HCkByteData sigData; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pkey = CkPrivateKey_Create(); // Load the private key from an PEM file: success = CkPrivateKey_LoadPemFile(pkey,"private.pem"); if (success != TRUE) { printf("%s\n",CkPrivateKey_lastErrorText(pkey)); CkPrivateKey_Dispose(pkey); return; } // Load the file to be signed. inData = CkByteData_Create(); success = CkByteData_loadFile(inData,"in.dat"); if (success != TRUE) { printf("Failed to load input data.\n"); CkPrivateKey_Dispose(pkey); CkByteData_Dispose(inData); return; } rsa = CkRsa_Create(); // Import the private key into the RSA component: success = CkRsa_ImportPrivateKeyObj(rsa,pkey); if (success != TRUE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkPrivateKey_Dispose(pkey); CkByteData_Dispose(inData); CkRsa_Dispose(rsa); return; } // OpenSSL uses big-endian... CkRsa_putLittleEndian(rsa,FALSE); sigData = CkByteData_Create(); success = CkRsa_SignBytes(rsa,inData,"sha256",sigData); if (success != TRUE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkPrivateKey_Dispose(pkey); CkByteData_Dispose(inData); CkRsa_Dispose(rsa); CkByteData_Dispose(sigData); return; } // Save the binary signature to a file. success = CkByteData_saveFile(sigData,"signature.sig"); if (success != TRUE) { printf("Failed to save signature file.\n"); CkPrivateKey_Dispose(pkey); CkByteData_Dispose(inData); CkRsa_Dispose(rsa); CkByteData_Dispose(sigData); return; } printf("Success.\n"); CkPrivateKey_Dispose(pkey); CkByteData_Dispose(inData); CkRsa_Dispose(rsa); CkByteData_Dispose(sigData); } |
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