Classic ASP

Encrypt File using X.509 Certificate using AES in CBC Mode

See more Encryption Examples

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.) Classic ASP

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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<%
success = 0

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

set crypt = Server.CreateObject("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.
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadFromFile("qa_data/certs/testCert.cer")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

success = crypt.SetEncryptCert(cert)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
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
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Finished.") & "</pre>"

%>
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