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(Unicode C) Verify DomainKey-Signature Headers in Downloaded EmailDownloads email from an IMAP server and verifies the DomainKey-Signature header(s) in each email, if present. Note: DKIM-Signatures are much more common than DomainKey-Signatures. See the other Chilkat example for verifying DKIM-Signatures (link in the code below).
#include <C_CkImapW.h> #include <C_CkDkimW.h> #include <C_CkJsonObjectW.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkImapW imap; BOOL success; HCkDkimW dkim; BOOL bUid; int seqNum; int j; int n; HCkJsonObjectW json; HCkBinDataW mimeData; int numSigs; // 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, login, select mailbox.. // Use TLS CkImapW_putSsl(imap,TRUE); CkImapW_putPort(imap,993); success = CkImapW_Connect(imap,L"imap.someMailServer.com"); if (success == TRUE) { success = CkImapW_Login(imap,L"myLogin",L"myPassword"); if (success == TRUE) { success = CkImapW_SelectMailbox(imap,L"Inbox"); } } if (success != TRUE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); return; } // Note: DKIM-Signatures are much more common than DomainKey-Signature // See DKIM-Signature Verify Sample. dkim = CkDkimW_Create(); // Download a max of 10 emails and verify any DomainKey-Signature headers // that are present. // Download emails by sequence numbers (not UIDs). bUid = FALSE; n = CkImapW_getNumMessages(imap); if (n > 50) { n = 50; } json = CkJsonObjectW_Create(); CkJsonObjectW_putEmitCompact(json,FALSE); // To verify DomainKey-Signature headers, we need the exact unmodified MIME bytes of each email. mimeData = CkBinDataW_Create(); seqNum = 1; while (seqNum <= n) { // The FetchSingleBd method was introduced in v9.5.0.76 success = CkImapW_FetchSingleBd(imap,seqNum,bUid,mimeData); if (success != TRUE) { wprintf(L"%s\n",CkImapW_lastErrorText(imap)); CkImapW_Dispose(imap); CkDkimW_Dispose(dkim); CkJsonObjectW_Dispose(json); CkBinDataW_Dispose(mimeData); return; } // Note: DKIM-Signatures are much more common than DomainKey-Signature // See DKIM-Signature Verify Sample. // Get the number of DomainKey-Signature headers. numSigs = CkDkimW_NumDomainKeySigs(dkim,mimeData); // Verify each.. j = 0; while (j < numSigs) { wprintf(L"------ DomainKey Signature %d\n",j); success = CkDkimW_DomainKeyVerify(dkim,j,mimeData); if (success != TRUE) { wprintf(L"Not valid.\n"); wprintf(L"%s\n",CkDkimW_lastErrorText(dkim)); } else { wprintf(L"valid.\n"); } // Show the additional information about the signature verification CkJsonObjectW_Load(json,CkDkimW_verifyInfo(dkim)); wprintf(L"%s\n",CkJsonObjectW_emit(json)); // The JSON contains information such as this: // { // "domain": "amazonses.com", // "selector": "7v7vs6w47njt4pimodk5mmttbegzsi6n", // "publicKey": "MIGfMA0GCSqG...v2GvWPqGHz6uqeQIDAQAB", // "canonicalization": "relaxed/simple", // "algorithm": "rsa-sha256", // "signedHeaders": "Subject:From:To:Date:Mime-Version:Content-Type:References:Message-Id:Feedback-ID", // "verified": "yes" // } j = j + 1; } seqNum = seqNum + 1; } success = CkImapW_Disconnect(imap); CkImapW_Dispose(imap); CkDkimW_Dispose(dkim); CkJsonObjectW_Dispose(json); CkBinDataW_Dispose(mimeData); } |
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