Chilkat HOME .NET Core C# Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi ActiveX Delphi DLL Go Java Lianja Mono C# Node.js Objective-C PHP ActiveX PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift 2 Swift 3,4,5... Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(Unicode C) Decrypt S/MIME and Verify S/MIME SignaturesUnicode C example to decrypt S/MIME and verify S/MIME signatures. The S/MIME is unwrapped to get the original MIME prior to signing/encrypting.
#include <C_CkMimeW.h> #include <C_CkCertW.h> void ChilkatSample(void) { HCkMimeW mime; BOOL success; BOOL isEncrypted; BOOL isSigned; HCkCertW signerCert; HCkCertW encryptCert; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. mime = CkMimeW_Create(); // Load an S/MIME message from a file: success = CkMimeW_LoadMimeFile(mime,L"signedMime.txt"); if (success != TRUE) { wprintf(L"%s\n",CkMimeW_lastErrorText(mime)); CkMimeW_Dispose(mime); return; } // The ContainsEncryptedParts/ContainsSignedParts methods // can be called to determine if the MIME is encrypted and/or signed: isEncrypted = CkMimeW_ContainsEncryptedParts(mime); isSigned = CkMimeW_ContainsSignedParts(mime); // We don't want the "unwrap extras". You'll see what those // are in a few moments... CkMimeW_putUnwrapExtras(mime,FALSE); // To verify the signature, call UnwrapSecurity. This will // verify the signature(s) and decrypt the S/MIME and restore // the MIME to the unsigned/unencrypted state. // The results of what was found are present in the MIME object's // properties, as well as extra header fields that are added // to the unwrapped MIME. success = CkMimeW_UnwrapSecurity(mime); if (success != TRUE) { // UnwrapSecurity returns TRUE if all signatures were // verified and all parts decrypted. wprintf(L"%s\n",CkMimeW_lastErrorText(mime)); CkMimeW_Dispose(mime); return; } // The mime.UnwrapExtras property controls whether or not // these additional fields are added to the unwrapped MIME: // // X-NumPartsSigned: 1 // X-SignaturesValid: yes // X-NumPartsEncrypted: 1 // X-Decrypted: no // // The X-NumPartsSigned/X-SignaturesValid headers are added // if the MIME was signed. // // The X-NumPartsEncrypted/X-Decrypted headers are added // if the MIME was encrypted. // // If the MIME was signed, get the certificate used for signing. if (isSigned == TRUE) { // The NumSignerCerts property indicates how many certificates // were used for signing. This example will assume the value is 1. // To get the 1st signer cert, call GetSignerCert with an index of 0: signerCert = CkMimeW_GetSignerCert(mime,0); if (CkMimeW_getLastMethodSuccess(mime) == TRUE) { wprintf(L"**** Signer Cert: %s\n",CkCertW_subjectCN(signerCert)); CkCertW_Dispose(signerCert); } } // If the MIME was encrypted, get the certificate used for encryption: if (isEncrypted == TRUE) { // The NumEncryptCerts property indicates how many certificates // were used for encrypting. This example will assume the value is 1. // To get the 1st encrypt cert, call GetEncryptCert with an index of 0: encryptCert = CkMimeW_GetEncryptCert(mime,0); if (CkMimeW_getLastMethodSuccess(mime) == TRUE) { wprintf(L"**** Encrypt Cert: %s\n",CkCertW_subjectCN(encryptCert)); CkCertW_Dispose(encryptCert); } } // Display the unwrapped MIME: wprintf(L"%s\n",CkMimeW_getMime(mime)); // Save the unwrapped MIME to a file: success = CkMimeW_SaveMime(mime,L"unwrappedMime.txt"); CkMimeW_Dispose(mime); } |
© 2000-2024 Chilkat Software, Inc. All Rights Reserved.