python encrypt and decrypt file with rsa public key

So when I convert it to a string for writing to file, I'll need to convert it back to type 'tuple' when I'm decrypting. RSAkey.encrypt(key, '') returns type 'tuple', so I figure RSA.decrypt() expects this type as well, but I can't write that type to a textfile. The code is as follows: RSAkey = custom_readfile_function('private_key.txt', 'r')Įnc_key = custom_readfile_function('enc_key.txt', 'r')Ĭustom_writefile_function('key.txt', str(aes_key), 'w') Return (self, ciphertext)įile '/usr/lib/python2.7/dist-packages/Crypto/PublicKey/pubkey.py', line 93, in decryptįile '/usr/lib/python2.7/dist-packages/Crypto/PublicKey/RSA.py', line 237, in _decrypt crypt(str(RSAkey.encrypt(key, '')))įile '/usr/lib/python2.7/dist-packages/Crypto/PublicKey/RSA.py', line 174, in decrypt The problem however, is that in another script, meant for decrypting enc_key to get the original AES key used to encrypt the files, trying to decrypt the enc_key which has been converted to a string produces an error: I am converting the enc_key to a string so that I can write it to a text file, otherwise enc_key.txt will contain rubbish. RSAkey = '-BEGIN PUBLIC KEY- Some RSA Key here -END PUBLIC KEY-'Ĭustom_writefile_function('enc_key.txt', enc_key)

The code is as follows: from Crypto.PublicKey import RSA The encrypted AES key will be shared with authorized persons in possession of the private key to decrypt it. Instead, we can encrypt a secret password (not shared with recipient) using recipient’s RSA public key, encrypt the large file using a key derived from this secret password and then send the encrypted secret password and encrypted file to the recipient.

I am trying to implement a script that will encrypt a file using a randomly generated AES key then encrypt said AES key with an RSA public key.

Python encrypt and decrypt file with rsa public key