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(C) IMAP Download and Verify Signed (S/MIME) EmailDemonstrates how to download and verify digitally signed S/MIME email.
#include <C_CkImap.h> #include <C_CkMessageSet.h> #include <C_CkEmail.h> #include <C_CkCert.h> void ChilkatSample(void) { HCkImap imap; BOOL success; BOOL fetchUids; HCkMessageSet messageSet; int i; const char *uid; HCkEmail email; HCkCert cert; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. imap = CkImap_Create(); // Connect to an IMAP server. // Use TLS CkImap_putSsl(imap,TRUE); CkImap_putPort(imap,993); success = CkImap_Connect(imap,"imap.someMailServer.com"); if (success != TRUE) { printf("%s\n",CkImap_lastErrorText(imap)); CkImap_Dispose(imap); return; } success = CkImap_Login(imap,"myLogin","myPassword"); if (success != TRUE) { printf("%s\n",CkImap_lastErrorText(imap)); CkImap_Dispose(imap); return; } // Select an IMAP mailbox success = CkImap_SelectMailbox(imap,"Inbox"); if (success != TRUE) { printf("%s\n",CkImap_lastErrorText(imap)); CkImap_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 = CkImap_Search(imap,"ALL",fetchUids); if (CkImap_getLastMethodSuccess(imap) != TRUE) { printf("%s\n",CkImap_lastErrorText(imap)); CkImap_Dispose(imap); return; } // Scan for emails with attachments, and save the attachments // to a sub-directory. i = 0; while (i < CkMessageSet_getCount(messageSet)) { uid = CkMessageSet_GetId(messageSet,i); printf("uid: %s\n",uid); email = CkImap_FetchSingle(imap,uid,TRUE); // 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 (CkEmail_getReceivedSigned(email) == TRUE) { printf("This email was signed.\n"); // Check to see if the signatures were verified. if (CkEmail_getSignaturesValid(email) == TRUE) { printf("Digital signature(s) verified.\n"); printf("Signer: %s\n",CkEmail_signedBy(email)); // The certificate used for signing may be obtained // by calling email.GetSignedByCert. cert = CkEmail_GetSignedByCert(email); if (CkEmail_getLastMethodSuccess(email) != TRUE) { printf("Failed to get signing certificate object.\n"); } else { printf("Signing cert: %s\n",CkCert_subjectCN(cert)); CkCert_Dispose(cert); } } else { printf("Digital signature verification failed.\n"); } } CkEmail_Dispose(email); i = i + 1; } // Disconnect from the IMAP server. success = CkImap_Disconnect(imap); CkMessageSet_Dispose(messageSet); CkImap_Dispose(imap); } |
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