Xojo Plugin
Xojo Plugin
Select the S/MIME Encryption Algorithm
See more Email Object Examples
Demonstrates the Chilkat Email.Pkcs7CryptAlg property, which selects the underlying symmetric encryption algorithm used when an email is sent encrypted with PKCS#7 public-key (S/MIME) encryption. Possible values are aes, aes-gcm, des, 3des, and rc2; the default is aes. This example selects AES and pairs it with a 256-bit key length.
Background: S/MIME encryption is hybrid. The message body is encrypted with a fast symmetric algorithm (the one this property chooses, such as AES) using a randomly generated one-time key; then that one-time key is itself encrypted with each recipient's public key. This gives the speed of symmetric encryption with the key-distribution convenience of public-key cryptography. Modern choices like
aes are strongly preferred — older options such as des and rc2 are considered weak.Chilkat Xojo Plugin Downloads
// Demonstrates the Email.Pkcs7CryptAlg property, which selects the symmetric encryption
// algorithm used when an email is sent encrypted with PKCS#7 (S/MIME) public-key
// encryption. Possible values: aes, aes-gcm, des, 3des, rc2. The default is aes.
Dim email As New Chilkat.Email
email.Subject = "Encrypted email"
email.Body = "This message will be S/MIME encrypted when sent."
// Select AES with a 256-bit key for the symmetric encryption.
email.Pkcs7CryptAlg = "aes"
email.Pkcs7KeyLength = 256
System.DebugLog("Pkcs7CryptAlg = " + email.Pkcs7CryptAlg)
System.DebugLog("Pkcs7KeyLength = " + Str(email.Pkcs7KeyLength))