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(Unicode C) Encrypt File using X.509 Certificate using AES in CBC ModeDemonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.)
#include <C_CkCrypt2W.h> #include <C_CkCertW.h> void ChilkatSample(void) { HCkCrypt2W crypt; HCkCertW cert; BOOL success; // This example requires the Chilkat Crypt API to have been previously unlocked. // See Unlock Chilkat Crypt for sample code. crypt = CkCrypt2W_Create(); // Use public-key cryptography for encryption. CkCrypt2W_putCryptAlgorithm(crypt,L"pki"); // Get an X.509 certificate to use for encrypting. // Note: Chilkat provides many different ways of loading a certificate, from many different formats, // or if on Windows, from the installed certificates on the system. // This example simply loads a certificate from a file. // Also, for encryption, only the public key is needed. Digital certificates embed the public key // within the X.509 format itself. Therefore, if you have a certificate, you also have the public key. cert = CkCertW_Create(); success = CkCertW_LoadFromFile(cert,L"qa_data/certs/testCert.cer"); if (success != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); return; } success = CkCrypt2W_SetEncryptCert(crypt,cert); if (success != TRUE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); return; } // Indicate the underlying bulk encryption algorithm to be used: CkCrypt2W_putPkcs7CryptAlg(crypt,L"aes"); CkCrypt2W_putKeyLength(crypt,128); // Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...) // There's one last option that could be set. If is the RSA encryption encryption/padding scheme. // By default, RSAES_PKCS1-V1_5 is used. If desired, the OaepPadding property could be set to TRUE to // use RSAES_OAEP. (We'll leave it set at the default value of FALSE) CkCrypt2W_putOaepPadding(crypt,FALSE); // Everything is specified. Now just encrypt... // The output is PKCS7 in binary DER format. success = CkCrypt2W_CkEncryptFile(crypt,L"qa_data/hamlet.xml",L"qa_output/hamlet.p7"); if (success != TRUE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); return; } wprintf(L"Finished.\n"); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert); } |
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