Lianja

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.) Lianja

llSuccess = .F.

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

loCrypt = createobject("CkCrypt2")

// Use public-key cryptography for encryption.
loCrypt.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.
loCert = createobject("CkCert")
llSuccess = loCert.LoadFromFile("qa_data/certs/testCert.cer")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

llSuccess = loCrypt.SetEncryptCert(loCert)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

// Indicate the underlying bulk encryption algorithm to be used:
loCrypt.Pkcs7CryptAlg = "aes"
loCrypt.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 .T. to
// use RSAES_OAEP.  (We'll leave it set at the default value of .F.)
loCrypt.OaepPadding = .F.

// Everything is specified.  Now just encrypt...
// The output is PKCS7 in binary DER format.
llSuccess = loCrypt.CkEncryptFile("qa_data/hamlet.xml","qa_output/hamlet.p7")
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

? "Finished."


release loCrypt
release loCert