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(CkPython) Encrypt File using X.509 Certificate using AES in CBC ModeDemonstrates 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.)
import sys import chilkat # This example requires the Chilkat Crypt API to have been previously unlocked. # See Unlock Chilkat Crypt for sample code. crypt = chilkat.CkCrypt2() # Use public-key cryptography for encryption. crypt.put_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. cert = chilkat.CkCert() success = cert.LoadFromFile("qa_data/certs/testCert.cer") if (success != True): print(cert.lastErrorText()) sys.exit() success = crypt.SetEncryptCert(cert) if (success != True): print(crypt.lastErrorText()) sys.exit() # Indicate the underlying bulk encryption algorithm to be used: crypt.put_Pkcs7CryptAlg("aes") crypt.put_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.put_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): print(crypt.lastErrorText()) sys.exit() print("Finished.") |
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