(Visual Basic 6.0) Duplicate openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

Demonstrates how to encrypt to binary DER using 256-bit AES (CBC mode) as the underlying symmetric encryption algorithm, to produce PKCS7 enveloped data (binary DER).

Duplicates the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim cert As New ChilkatCert
Dim success As Long
success = cert.LoadFromFile("qa_data/openssl/EE.cer")
If (success = 0) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

Dim bd As New ChilkatBinData
success = bd.LoadFile("qa_data/openssl/hello.txt")
' Assuming success..

Dim crypt As New ChilkatCrypt2
success = crypt.SetEncryptCert(cert)
If (success = 0) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

crypt.CryptAlgorithm = "PKI"

' Indicate the underlying symmetric encryption to be used:
crypt.Pkcs7CryptAlg = "aes"
crypt.KeyLength = 256
crypt.CipherMode = "cbc"

success = crypt.CkEncryptFile("qa_data/openssl/hello.txt","qa_output/hello.txt.enc")
If (success = 0) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

Debug.Print "Success."