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(Unicode C) Add DomainKey-Signature Header to MIME / EmailDemonstrates how to add a DomainKey-Signature header field to a MIME message. Note: The DKIM / DomainKey functionality is included with the Chilkat MIME license.
#include <C_CkDkimW.h> #include <C_CkByteData.h> void ChilkatSample(void) { HCkDkimW dkim; const wchar_t *password; BOOL success; HCkByteData mimeData; HCkByteData domainKeySignedMime; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. dkim = CkDkimW_Create(); // To create a DomainKey signature for email (i.e. MIME), // you'll need to provide the following: // (1) An RSA private key in any common file format. // (2) The domain name (typically the same domain // as the sender of an email). // (3) A selector for the domain name -- an arbitrary string // to identify the matching public key in DNS. // To allow an email recipient to verify the DomainKey signature via an // external email client supporting DomainKey or using other software, // you will need to create a DNS record with the selector // and matching public key. This example does not provide // information about DomainKey DNS record creation. // (Chilkat does not provide an API for creating DNS records. // Creating the DomainKey DNS record is something you would do // manually.) // Set the domain and selector: // You'll need to provide your own values here.. CkDkimW_putDomainKeyDomain(dkim,L"chilkatsoft.com"); CkDkimW_putDomainKeySelector(dkim,L"salmon"); // Load a private key from any common RSA private key // format, such as DER, PKCS8, PEM, XML, etc. // The LoadDomainKeyPkFile method automatically detects // the file format and reads it appropriately. // If a password is not required, you'll still need to provide // a password string argument, but it is ignored. password = L"optionalPassword"; success = CkDkimW_LoadDomainKeyPkFile(dkim,L"myPrivateKey.pem",password); if (success != TRUE) { wprintf(L"%s\n",CkDkimW_lastErrorText(dkim)); CkDkimW_Dispose(dkim); return; } // Load a MIME file. mimeData = CkByteData_Create(); success = CkByteData_loadFile(mimeData,L"testMessage.eml"); if (success != TRUE) { wprintf(L"Failed to load file.\n"); CkDkimW_Dispose(dkim); CkByteData_Dispose(mimeData); return; } // Sign it. This adds the DomainKey-Signature header and // returns the new MIME with DomainKey-Signature added. domainKeySignedMime = CkByteData_Create(); success = CkDkimW_AddDomainKeySignature(dkim,mimeData,domainKeySignedMime); if (success != TRUE) { wprintf(L"%s\n",CkDkimW_lastErrorText(dkim)); CkDkimW_Dispose(dkim); CkByteData_Dispose(mimeData); CkByteData_Dispose(domainKeySignedMime); return; } success = CkByteData_saveFile(domainKeySignedMime,L"domainKeySigned.eml"); if (success != TRUE) { wprintf(L"Failed to save file.\n"); CkDkimW_Dispose(dkim); CkByteData_Dispose(mimeData); CkByteData_Dispose(domainKeySignedMime); return; } wprintf(L"Success.\n"); CkDkimW_Dispose(dkim); CkByteData_Dispose(mimeData); CkByteData_Dispose(domainKeySignedMime); } |
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