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(Unicode C) Send aes-gcm authEnvelopedData Encrypted EmailSee more SMTP ExamplesNote: This example requires Chilkat v10.0.0 or later Demonstrates how to send encrypted email using 128-bit AES in GCM mode.
"AES-GCM" (Advanced Encryption Standard - Galois/Counter Mode) is a cryptographic algorithm that provides both encryption and integrity protection (authentication). When used in the context of email security with "authEnvelopedData", it often refers to a method of securely sending encrypted and authenticated email content. Here’s a brief breakdown:
In short, AES-GCM with "authEnvelopedData" provides a way to encrypt and authenticate emails, making them confidential and resistant to tampering.
#include <C_CkMailManW.h> #include <C_CkCertW.h> #include <C_CkEmailW.h> void ChilkatSample(void) { HCkMailManW mailman; HCkCertW cert; BOOL success; HCkEmailW email; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The mailman object is used for sending and receiving email. mailman = CkMailManW_Create(); CkMailManW_putSmtpHost(mailman,L"smtp.example.com"); CkMailManW_putSmtpUsername(mailman,L"my_smtp_login"); CkMailManW_putSmtpPassword(mailman,L"my_smtp_password"); // The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS CkMailManW_putSmtpPort(mailman,465); CkMailManW_putSmtpSsl(mailman,TRUE); // Use the recipient's certificate for encryption. cert = CkCertW_Create(); success = CkCertW_LoadFromFile(cert,L"c:/someDir/recipient_cert.cer"); if (success != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkMailManW_Dispose(mailman); CkCertW_Dispose(cert); return; } email = CkEmailW_Create(); CkEmailW_putSubject(email,L"This email is encrypted"); CkEmailW_putBody(email,L"This is AES-GCM encrypted mail"); CkEmailW_putFrom(email,L"Mary <mary@example1.com>"); success = CkEmailW_AddTo(email,L"Joe",L"joe@example.com"); // Specify that AES-GCM w/ authEnvelopedData is to be used. // Also specify other params.. CkEmailW_putPkcs7CryptAlg(email,L"aes-gcm"); CkEmailW_putPkcs7KeyLength(email,128); CkEmailW_putOaepPadding(email,TRUE); CkEmailW_putOaepHash(email,L"sha256"); CkEmailW_putOaepMgfHash(email,L"sha256"); // Indicate the email is to be sent encrypted. CkEmailW_putSendEncrypted(email,TRUE); // Specify the certificate to be used for encryption. success = CkEmailW_SetEncryptCert(email,cert); success = CkMailManW_SendEmail(mailman,email); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); } else { wprintf(L"Mail Sent!\n"); } CkMailManW_Dispose(mailman); CkCertW_Dispose(cert); CkEmailW_Dispose(email); } |
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