Chilkat2-Python

RSA Encrypt and Decrypt Strings

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_LANGUAGE_ sample code to RSA public-key encrypt and decrypt strings using public and private keys. Chilkat2-Python

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()

# This example also generates the public and private
# keys to be used in the RSA encryption.
# Normally, you would generate a key pair once,
# and distribute the public key to your partner.
# Anything encrypted with the public key can be
# decrypted with the private key.  The reverse is 
# also true: anything encrypted using the private
# key can be decrypted using the public key.

# Generate a 2048-bit key.  Chilkat RSA supports
# key sizes ranging from 512 bits to 4096 bits.
privKey = chilkat2.PrivateKey()
success = rsa.GenKey(2048,privKey)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

pubKey = chilkat2.PublicKey()
privKey.ToPublicKey(pubKey)

plainText = "Encrypting and decrypting should be easy!"

# Start with a new RSA object to demonstrate that all we
# need are the keys previously exported:
rsaEncryptor = chilkat2.Rsa()

# Encrypted output is always binary.  In this case, we want
# to encode the encrypted bytes in a printable string.
# Our choices are "hex", "base64", "url", "quoted-printable".
rsaEncryptor.EncodingMode = "hex"

# We'll encrypt with the public key and decrypt with the private
# key.
success = rsaEncryptor.UsePublicKey(pubKey)

usePrivateKey = False
encryptedStr = rsaEncryptor.EncryptStringENC(plainText,usePrivateKey)
print(encryptedStr)

# Now decrypt:
rsaDecryptor = chilkat2.Rsa()

rsaDecryptor.EncodingMode = "hex"
success = rsaDecryptor.UsePrivateKey(privKey)

usePrivateKey = True
decryptedStr = rsaDecryptor.DecryptStringENC(encryptedStr,usePrivateKey)

print(decryptedStr)