(Chilkat2-Python) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS

import sys
import chilkat2

success = False

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

rsa = chilkat2.Rsa()

# First load a public key object with a public key.
# In this case, we'll load it from a file.
pubkey = chilkat2.PublicKey()
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.PkcsPadding = False
rsa.OaepHash = "sha256"

# Indicate we'll want hex output
rsa.EncodingMode = "hex"

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

# -------------------------------------------------
# Now decrypt with the matching private key.
rsa2 = chilkat2.Rsa()

privKey = chilkat2.PrivateKey()
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.PkcsPadding = False
rsa2.EncodingMode = "hex"
rsa2.OaepHash = "sha256"

originalStr = rsa2.DecryptStringENC(encryptedStr,True)

print(originalStr)