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pycrypto files

Terrible Tapir answered on August 25, 2022 Popularity 10/10 Helpfulness 2/10

answer pycrypto files

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pycrypto files

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import os, random, struct
from Crypto.Cipher import AES

def encrypt_file(key, in_filename, out_filename=None, chunksize=64*1024):
    """ Encrypts a file using AES (CBC mode) with the
        given key.

        key:
            The encryption key - a string that must be
            either 16, 24 or 32 bytes long. Longer keys
            are more secure.

        in_filename:
            Name of the input file

        out_filename:
            If None, '<in_filename>.enc' will be used.

        chunksize:
            Sets the size of the chunk which the function
            uses to read and encrypt the file. Larger chunk
            sizes can be faster for some files and machines.
            chunksize must be divisible by 16.
    """
    if not out_filename:
        out_filename = in_filename + '.enc'

    iv = ''.join(chr(random.randint(0, 0xFF)) for i in range(16))
    encryptor = AES.new(key, AES.MODE_CBC, iv)
    filesize = os.path.getsize(in_filename)

    with open(in_filename, 'rb') as infile:
        with open(out_filename, 'wb') as outfile:
            outfile.write(struct.pack('<Q', filesize))
            outfile.write(iv)

            while True:
                chunk = infile.read(chunksize)
                if len(chunk) == 0:
                    break
                elif len(chunk) % 16 != 0:
                    chunk += ' ' * (16 - len(chunk) % 16)

                outfile.write(encryptor.encrypt(chunk))

Popularity 10/10 Helpfulness 2/10 Language python

Source: eli.thegreenplace.net

Tags: pycrypto python

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Contributed on Aug 25 2022

Terrible Tapir

0 Answers Avg Quality 2/10

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pycrypto files

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from Crypto.Cipher import AES

key = '0123456789abcdef'
IV = 16 * '\x00'           # Initialization vector: discussed later
mode = AES.MODE_CBC
encryptor = AES.new(key, mode, IV=IV)

text = 'j' * 64 + 'i' * 128
ciphertext = encryptor.encrypt(text)

Popularity 10/10 Helpfulness 4/10 Language python

Source: eli.thegreenplace.net

Tags: pycrypto pycrypt

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Contributed on Aug 25 2022

Terrible Tapir

0 Answers Avg Quality 2/10

pycrypto files

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decryptor = AES.new(key, mode, IV=IV)
plain = decryptor.decrypt(ciphertext)

Popularity 10/10 Helpfulness 2/10 Language python

Source: eli.thegreenplace.net

Tags: pycrypto pycrypt

Link to this answer
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Contributed on Aug 25 2022

Terrible Tapir

0 Answers Avg Quality 2/10

pycrypto files

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