Generate Random Aes Key Python

  1. Generate Aes Key Python

If you want the user to enter a password, don't limit the length (except maybe to set a minimum), and use something like PBKDF2 to stretch the key and slow down dictionary guesses against the password. (As @marstato commented). On the other hand, if you want to generate a random key, pull bytes out a strong random bit generator, and save it in. The following are code examples for showing how to use Crypto.Cipher.AES.keysize.They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like.

an example of symmetric encryption in python using a single known secret key - utilizes AES from PyCrypto library
AES_example.py
Random

The following are code examples for showing how to use Crypto.Random.getrandombytes.They are from open source Python projects. You can vote up the examples you like.

# Inspired from https://pythonprogramming.net/encryption-and-decryption-in-python-code-example-with-explanation/
# PyCrypto docs available at https://www.dlitz.net/software/pycrypto/api/2.6/
fromCrypto.CipherimportAES
importbase64, os
defgenerate_secret_key_for_AES_cipher():
# AES key length must be either 16, 24, or 32 bytes long
AES_key_length=16# use larger value in production
# generate a random secret key with the decided key length
# this secret key will be used to create AES cipher for encryption/decryption
secret_key=os.urandom(AES_key_length)
# encode this secret key for storing safely in database
encoded_secret_key=base64.b64encode(secret_key)
returnencoded_secret_key
defencrypt_message(private_msg, encoded_secret_key, padding_character):
# decode the encoded secret key
secret_key=base64.b64decode(encoded_secret_key)
# use the decoded secret key to create a AES cipher
cipher=AES.new(secret_key)
# pad the private_msg
# because AES encryption requires the length of the msg to be a multiple of 16
padded_private_msg=private_msg+ (padding_character* ((16-len(private_msg)) %16))
# use the cipher to encrypt the padded message
encrypted_msg=cipher.encrypt(padded_private_msg)
# encode the encrypted msg for storing safely in the database
encoded_encrypted_msg=base64.b64encode(encrypted_msg)
# return encoded encrypted message
returnencoded_encrypted_msg
defdecrypt_message(encoded_encrypted_msg, encoded_secret_key, padding_character):
# decode the encoded encrypted message and encoded secret key
secret_key=base64.b64decode(encoded_secret_key)
encrypted_msg=base64.b64decode(encoded_encrypted_msg)
# use the decoded secret key to create a AES cipher
cipher=AES.new(secret_key)
# use the cipher to decrypt the encrypted message
decrypted_msg=cipher.decrypt(encrypted_msg)
# unpad the encrypted message
unpadded_private_msg=decrypted_msg.rstrip(padding_character)
# return a decrypted original private message
returnunpadded_private_msg
####### BEGIN HERE #######
private_msg=''
Lorem ipsum dolor sit amet, malis recteque posidonium ea sit, te vis meliore verterem. Duis movet comprehensam eam ex, te mea possim luptatum gloriatur. Modus summo epicuri eu nec. Ex placerat complectitur eos.
''
padding_character='{'
secret_key=generate_secret_key_for_AES_cipher()
encrypted_msg=encrypt_message(private_msg, secret_key, padding_character)
decrypted_msg=decrypt_message(encrypted_msg, secret_key, padding_character)
print' Secret Key: %s - (%d)'% (secret_key, len(secret_key))
print'Encrypted Msg: %s - (%d)'% (encrypted_msg, len(encrypted_msg))
print'Decrypted Msg: %s - (%d)'% (decrypted_msg, len(decrypted_msg))

commented Jan 18, 2019
edited

See also https://gist.github.com/btoueg/f71b62f456550da42ea9f4a4bd907d21 for an example using cryptography

Generate Aes Key Python

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