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(Unicode C) RSA Encrypt Randomly Generated AES KeyDemonstrates how to RSA encrypt a randomly generated AES key.
#include <C_CkPrngW.h> #include <C_CkBinDataW.h> #include <C_CkCertW.h> #include <C_CkPublicKeyW.h> #include <C_CkRsaW.h> void ChilkatSample(void) { HCkPrngW prng; HCkBinDataW bdAesKey; BOOL success; HCkCertW cert; HCkPublicKeyW pubKey; HCkRsaW rsa; const wchar_t *encryptedAesKey; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // First generate a 256-bit AES key (32 bytes). prng = CkPrngW_Create(); bdAesKey = CkBinDataW_Create(); success = CkPrngW_GenRandomBd(prng,32,bdAesKey); // Use a public key from a certificate for RSA encryption. cert = CkCertW_Create(); success = CkCertW_LoadFromFile(cert,L"qa_data/pem/mf_public_rsa.pem"); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkPrngW_Dispose(prng); CkBinDataW_Dispose(bdAesKey); CkCertW_Dispose(cert); return; } pubKey = CkCertW_ExportPublicKey(cert); if (CkCertW_getLastMethodSuccess(cert) != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkPrngW_Dispose(prng); CkBinDataW_Dispose(bdAesKey); CkCertW_Dispose(cert); return; } rsa = CkRsaW_Create(); success = CkRsaW_ImportPublicKeyObj(rsa,pubKey); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrngW_Dispose(prng); CkBinDataW_Dispose(bdAesKey); CkCertW_Dispose(cert); CkRsaW_Dispose(rsa); return; } CkPublicKeyW_Dispose(pubKey); // RSA encrypt our 32-byte AES key. // The contents of bdAesKey are replaced with result of the RSA encryption. success = CkRsaW_EncryptBd(rsa,bdAesKey,FALSE); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrngW_Dispose(prng); CkBinDataW_Dispose(bdAesKey); CkCertW_Dispose(cert); CkRsaW_Dispose(rsa); return; } // Return the result as a base64 string encryptedAesKey = CkBinDataW_getEncoded(bdAesKey,L"base64"); wprintf(L"encrypted AES key = %s\n",encryptedAesKey); CkPrngW_Dispose(prng); CkBinDataW_Dispose(bdAesKey); CkCertW_Dispose(cert); CkRsaW_Dispose(rsa); } |
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