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(Go) Decrypt S/MIME and Verify S/MIME SignaturesGo example to decrypt S/MIME and verify S/MIME signatures. The S/MIME is unwrapped to get the original MIME prior to signing/encrypting. Note: This example requires Chilkat v11.0.0 or greater.
success := false // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. mime := Mime_Ref.html">chilkat.NewMime() // Load an S/MIME message from a file: success = mime.LoadMimeFile("signedMime.txt") if success == false { fmt.Println(mime.LastErrorText()) mime.DisposeMime() return } // The ContainsEncryptedParts/ContainsSignedParts methods // can be called to determine if the MIME is encrypted and/or signed: isEncrypted := mime.ContainsEncryptedParts() isSigned := mime.ContainsSignedParts() // We don't want the "unwrap extras". You'll see what those // are in a few moments... mime.SetUnwrapExtras(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 = mime.UnwrapSecurity() if success != true { // UnwrapSecurity returns true if all signatures were // verified and all parts decrypted. fmt.Println(mime.LastErrorText()) mime.DisposeMime() 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 { signerCert := Cert_Ref.html">chilkat.NewCert() // 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 LastSignerCert with an index of 0: success = mime.LastSignerCert(0,signerCert) if success == true { fmt.Println("**** Signer Cert_Ref.html">Cert: ", signerCert.SubjectCN()) } } // If the MIME was encrypted, get the certificate used for decryption if isEncrypted == true { // The NumDecryptCerts property indicates how many certificates // were used for decrypting. This example will assume the value is 1. // To get the 1st decrypt cert, call LastDecryptCert with an index of 0: decryptCert := Cert_Ref.html">chilkat.NewCert() success = mime.LastDecryptCert(0,decryptCert) if success == true { fmt.Println("**** Decrypt Cert_Ref.html">Cert: ", decryptCert.SubjectCN()) } } // Display the unwrapped MIME: fmt.Println(*mime.GetMime()) // Save the unwrapped MIME to a file: success = mime.SaveMime("unwrappedMime.txt") mime.DisposeMime() signerCert.DisposeCert() decryptCert.DisposeCert() |
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