CkPython Requires Chilkat v11.0.0+

RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

See more RSA Examples

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context. CkPython

import sys
import chilkat

success = False

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

rsa = chilkat.CkRsa()

#  First load a public key object with a public key.
#  In this case, we'll load it from a file.
pubkey = chilkat.CkPublicKey()
success = pubkey.LoadFromFile("qa_data/pem/rsa_public.pem")
if (success == False):
    print(pubkey.lastErrorText())
    sys.exit()

#  RSA encryption is limited to small amounts of data. The limit
#  is typically a few hundred bytes and is based on the key size and
#  padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
#  encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
plainText = "Time is an illusion. Lunchtime doubly so."

#  Import the public key to be used for encrypting.
success = rsa.UsePublicKey(pubkey)

#  To get OAEP padding, set the PkcsPadding property equal to False
rsa.put_PkcsPadding(False)
rsa.put_OaepHash("sha256")

#  Indicate we'll want hex output
rsa.put_EncodingMode("hex")

#  Encrypt..
usePrivateKey = False
encryptedStr = rsa.encryptStringENC(plainText,usePrivateKey)
print(encryptedStr)

#  -------------------------------------------------
#  Now decrypt with the matching private key.
rsa2 = chilkat.CkRsa()

privKey = chilkat.CkPrivateKey()
success = privKey.LoadEncryptedPem("qa_data/pem/rsa_passwd.pem","passwd")
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

success = rsa2.UsePrivateKey(privKey)

#  Make sure we have the same settings used for encryption.
rsa2.put_PkcsPadding(False)
rsa2.put_EncodingMode("hex")
rsa2.put_OaepHash("sha256")

originalStr = rsa2.decryptStringENC(encryptedStr,True)

print(originalStr)