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(Unicode C) IMAP Download and Verify Signed (S/MIME) EmailDemonstrates how to download and verify digitally signed S/MIME email. Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkImapW.h> #include <C_CkMessageSetW.h> #include <C_CkEmailW.h> #include <C_CkCertW.h> void ChilkatSample(void) { BOOL success; HCkImapW imap; BOOL fetchUids; HCkMessageSetW messageSet; HCkEmailW email; HCkCertW cert; int i; const wchar_t *uid; success = FALSE; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. imap = CkImapW_Create(); // Connect to an IMAP server. // Use TLS CkImapW_putSsl(imap,TRUE); CkImapW_putPort(imap,993); success = CkImapW_Connect(imap,L"imap.example.com"); if (success == FALSE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); return; } success = CkImapW_Login(imap,L"myLogin",L"myPassword"); if (success == FALSE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); return; } // Select an IMAP mailbox success = CkImapW_SelectMailbox(imap,L"Inbox"); if (success == FALSE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); return; } // We can choose to fetch UIDs or sequence numbers. fetchUids = TRUE; // Get the message IDs of all the emails in the mailbox messageSet = CkMessageSetW_Create(); success = CkImapW_QueryMbx(imap,L"ALL",fetchUids,messageSet); if (success == FALSE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); CkMessageSetW_Dispose(messageSet); return; } email = CkEmailW_Create(); cert = CkCertW_Create(); i = 0; while (i < CkMessageSetW_getCount(messageSet)) { uid = CkMessageSetW_GetId(messageSet,i); wprintf(L"uid: %s\n",uid); success = CkImapW_FetchEmail(imap,FALSE,uid,TRUE,email); if (success == FALSE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); CkMessageSetW_Dispose(messageSet); CkEmailW_Dispose(email); CkCertW_Dispose(cert); return; } // The security layers of signed and/or encrypted emails // are automatically "unwrapped" when loaded into // a Chilkat email object. // An application only needs to check to see if an email // was received signed or encrypted, and then examine // the success/failure. For example: if (CkEmailW_getReceivedSigned(email) == TRUE) { wprintf(L"This email was signed.\n"); // Check to see if the signatures were verified. if (CkEmailW_getSignaturesValid(email) == TRUE) { wprintf(L"Digital signature(s) verified.\n"); wprintf(L"Signer: %s\n",CkEmailW_signedBy(email)); // Get the certificate used for signing. success = CkEmailW_LastSignerCert(email,0,cert); if (success == FALSE) { wprintf(L"Failed to get signing certificate object.\n"); } else { wprintf(L"Signing cert: %s\n",CkCertW_subjectCN(cert)); } } else { wprintf(L"Digital signature verification failed.\n"); } } i = i + 1; } // Disconnect from the IMAP server. success = CkImapW_Disconnect(imap); CkImapW_Dispose(imap); CkMessageSetW_Dispose(messageSet); CkEmailW_Dispose(email); CkCertW_Dispose(cert); } |
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