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(Unicode C) Encrypt a file to a PKCS7 encrypted message using multiple certificates from different usersDemonstrates how to encrypt a file to a PKCS7 encrypted message using multiple certificates from different users. Any one of the users can decrypt using his/her own certificate + private key. Note: When doing public key encryption, it is the public key that is used to encrypt. The private key is required for decryption.
#include <C_CkCrypt2W.h> #include <C_CkCertW.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkCrypt2W crypt; HCkCertW cert1; BOOL success; HCkCertW cert2; HCkCertW cert3; HCkBinDataW fileData; // This example requires the Chilkat Crypt API to have been previously unlocked. // See Unlock Chilkat Crypt for sample code. crypt = CkCrypt2W_Create(); // Tell the crypt object to use 3 certificates. // Do this by calling AddEncryptCert for each certificate. // Load a digital certificate. // We don't need the private key for encryption. // Only the public key is needed (which is included in a certificate). cert1 = CkCertW_Create(); success = CkCertW_LoadFromFile(cert1,L"qa_data/user1/cert_user1.pem"); // Assume success for the example, but make sure your application checks for success/failure... CkCrypt2W_AddEncryptCert(crypt,cert1); cert2 = CkCertW_Create(); success = CkCertW_LoadFromFile(cert2,L"qa_data/user2/cert_user2.pem"); CkCrypt2W_AddEncryptCert(crypt,cert2); cert3 = CkCertW_Create(); success = CkCertW_LoadFromFile(cert3,L"qa_data/user3/cert_user3.pem"); CkCrypt2W_AddEncryptCert(crypt,cert3); // Indicate that we want PKI encryption (i.e. public-key infrastructure) // to produce a CMS message (Cryptographic Message Syntax/PKCS7), // that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the // bulk encryption. CkCrypt2W_putCryptAlgorithm(crypt,L"pki"); CkCrypt2W_putPkcs7CryptAlg(crypt,L"aes"); CkCrypt2W_putKeyLength(crypt,128); CkCrypt2W_putOaepHash(crypt,L"sha256"); CkCrypt2W_putOaepPadding(crypt,TRUE); // Load the file to be encrypted... fileData = CkBinDataW_Create(); success = CkBinDataW_LoadFile(fileData,L"qa_data/jpg/penguins.jpg"); // Your app should check for success/failure.. // Encrypt the data. The contents of the fileData object are replaced with the PKCS7 encrypted message. success = CkCrypt2W_EncryptBd(crypt,fileData); if (success != TRUE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert1); CkCertW_Dispose(cert2); CkCertW_Dispose(cert3); CkBinDataW_Dispose(fileData); return; } // Save the PKCS7 encrypted message to a file.. success = CkBinDataW_WriteFile(fileData,L"qa_output/pkcs7_encrypted.p7"); // Now indicate that the PKCS7 output is to be returned in the base64 encoding. CkCrypt2W_putEncodingMode(crypt,L"base64"); wprintf(L"OK.\n"); CkCrypt2W_Dispose(crypt); CkCertW_Dispose(cert1); CkCertW_Dispose(cert2); CkCertW_Dispose(cert3); CkBinDataW_Dispose(fileData); } |
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