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(VBScript) 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 ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

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

set crypt = CreateObject("Chilkat_9_5_0.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.
set cert = CreateObject("Chilkat_9_5_0.Cert")
success = cert.LoadFromFile("qa_data/certs/testCert.cer")
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

success = crypt.SetEncryptCert(cert)
If (success <> 1) Then
    outFile.WriteLine(crypt.LastErrorText)
    WScript.Quit
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 1 to
'  use RSAES_OAEP.  (We'll leave it set at the default value of 0)
crypt.OaepPadding = 0

'  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 <> 1) Then
    outFile.WriteLine(crypt.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("Finished.")

outFile.Close

 

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