Chilkat2-Python Requires Chilkat v11.0.0+

RSA Encrypt String to Binary Result and Reverse

See more RSA Examples

Demonstrates how to RSA encrypt a string to a binary result, and the reverse. Chilkat2-Python

import sys
import chilkat2

success = False

# The RSA public key is used for encryption, and the private key for decryption.

# The public key's role is to make encryption accessible to anyone while ensuring that
# only the private key holder can decrypt the messages.
# The public key is designed to be widely distributed so anyone can use it to encrypt messages
# intended for the owner of the private key.

glob = chilkat2.Global()
glob.DefaultUtf8 = True

# Load our 2048-bit RSA public key.
pubKey = chilkat2.PublicKey()
# In all Chilkat methods expecting a path, you pass either absolute or relative paths.
success = pubKey.LoadFromFile("qa_data/rsaKeys/myTestRsaPublic.pem")
if (success == False):
    print(pubKey.LastErrorText)
    sys.exit()

rsa = chilkat2.Rsa()

# Tell RSA to use the public key.
rsa.UsePublicKey(pubKey)

# RSA encryption is for small amounts of data, on the order of 200 bytes or less.
# The maximum number of bytes that can be RSA encrypted depends
# on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding).
# For specific limits, see: RSA Encryption Maximum Number of Bytes

# Encrypt the utf-8 byte representation of the string.
rsa.Charset = "utf-8"

# Be Careful when Using non-us-ascii String Literals in Source Code

# encBytes is a memoryview
encBytes = rsa.EncryptString("Élève français dîne à côté d’un café où l’on sert déjà du gâteau au chocolat et des éclairs délicieux",False)

# ------------------------------------------------------------------------------------------------------------------------
# Let's decrypt, which requires the matching private key...

# Load the matching 2048-bit RSA private key.
privKey = chilkat2.PrivateKey()
password = "secret"
success = privKey.LoadAnyFormatFile("qa_data/rsaKeys/myTestRsaPrivate.pem",password)
if (success == False):
    print(privKey.LastErrorText)
    sys.exit()

# Tell the RSA object to use the private key.
rsa.UsePrivateKey(privKey)

# Indicate that after decrypting the resultant decrypted bytes contains the utf-8 byte representation of the text.
rsa.Charset = "utf-8"
originalText = rsa.DecryptString(encBytes,True)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

print("Original text = " + originalText)
print("Success.")