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(Unicode C) Load Signed and/or Encrypted Email and Unwrap Security LayersThe LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.
#include <C_CkEmailW.h> void ChilkatSample(void) { HCkEmailW email; BOOL success; email = CkEmailW_Create(); // Provide PFX/.p12 files for any certs+keys needed for decryption. // Signature verification does not need anything extra. // (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption // on a Windows system.) success = CkEmailW_AddPfxSourceFile(email,L"/pfxFiles/certs_and_keys_1.pfx",L"pfxPassword1"); if (success != TRUE) { wprintf(L"%s\n",CkEmailW_lastErrorText(email)); CkEmailW_Dispose(email); return; } success = CkEmailW_AddPfxSourceFile(email,L"/pfxFiles/certs_and_keys_2.pfx",L"pfxPassword2"); if (success != TRUE) { wprintf(L"%s\n",CkEmailW_lastErrorText(email)); CkEmailW_Dispose(email); return; } // ... // Load a potentially signed and/or encrypted email. success = CkEmailW_LoadEml(email,L"someDir/someEmail.eml"); // If the email was signed and/or encrypted, it was "unwrapped", i.e. // the email is already decrypted and in a state as if it were never signed or encrypted. // You may check to see if the email was received encrypted or signed, and if so, // whether it was successfully unwrapped and who signed or encrypted it: if (CkEmailW_getReceivedEncrypted(email) == TRUE) { wprintf(L"This email was encrypted.\n"); if (CkEmailW_getDecrypted(email) == TRUE) { wprintf(L"This email was successfully decrypted. It was encrypted by:\n"); wprintf(L"%s\n",CkEmailW_encryptedBy(email)); } else { wprintf(L"This email was not decrypted.\n"); } } if (CkEmailW_getReceivedSigned(email) == TRUE) { wprintf(L"This email was signed.\n"); if (CkEmailW_getSignaturesValid(email) == TRUE) { wprintf(L"The signature was verified. It was signed by:\n"); wprintf(L"%s\n",CkEmailW_signedBy(email)); } else { wprintf(L"The signature verification failed.\n"); } } // At this point, the contents of the email, including attachments, can be accessed normally.. CkEmailW_Dispose(email); } |
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