(Xojo Plugin) Encrypt File using X.509 Certificate using AES in CBC Mode

Demonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.)

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

//  This example requires the Chilkat Crypt API to have been previously unlocked.
//  See Unlock Chilkat Crypt for sample code.

Dim crypt As New Chilkat.Crypt2

//  Use public-key cryptography for encryption.
crypt.CryptAlgorithm = "pki"

//  Get an X.509 certificate to use for encrypting.
//  Note: Chilkat provides many different ways of loading a certificate, from many different formats,
//  or if on Windows, from the installed certificates on the system.
//  This example simply loads a certificate from a file.
//  Also, for encryption, only the public key is needed.  Digital certificates embed the public key
//  within the X.509 format itself.  Therefore, if you have a certificate, you also have the public key.
Dim cert As New Chilkat.Cert
Dim success As Boolean
success = cert.LoadFromFile("qa_data/certs/testCert.cer")
If (success <> True) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

success = crypt.SetEncryptCert(cert)
If (success <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

//  Indicate the underlying bulk encryption algorithm to be used:
crypt.Pkcs7CryptAlg = "aes"
crypt.KeyLength = 128

//  Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...)

//  There's one last option that could be set.  If is the RSA encryption encryption/padding scheme.
//  By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to True to
//  use RSAES_OAEP.  (We'll leave it set at the default value of False)
crypt.OaepPadding = False

//  Everything is specified.  Now just encrypt...
//  The output is PKCS7 in binary DER format.
success = crypt.CkEncryptFile("qa_data/hamlet.xml","qa_output/hamlet.p7")
If (success <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

System.DebugLog("Finished.")