Help/documentation about "cryptolib"

[nastiliano]

Hello everyone,

I've been looking for documentation about "cryptolib" module and I can't find an explanation or examples about how to use the different AES modes and all about that.

Someone could you give me a link o some information (example or whatever) about an AES CTR string encryption/decryption for example?

Thank yo very much!!

[nastiliano]

Hello everyone,

I've been looking for documentation about "cryptolib" module and I can't find an explanation or examples about how to use the different AES modes and all about that.

Someone could you give me a link o some information (example or whatever) about an AES CTR string encryption/decryption for example?

Thank yo very much!!

Hello everyone,

After hour and hour looking for some examples. I only found:

https://hwwong168.wordpress.com/2019/09/25/esp32-micropython-implementation-of-cryptographic/

import uos
from ucryptolib import aes

MODE_ECB = 1
MODE_CBC = 2
MODE_CTR = 6
BLOCK_SIZE = 16
key = b'I_am_32bytes=256bits_key_padding'

ECB MODE

cipher = aes(key, MODE_ECB)
plaintext = 'This is AES cryptographic'
print('Plain Text:', plaintext)
pad = BLOCK_SIZE - len(plaintext) % BLOCK_SIZE
plaintext = plaintext + " "*pad
encrypted = cipher.encrypt(plaintext)
print('AES-ECB encrypted:', encrypted )
cipher = aes(key,1) # cipher has to renew for decrypt
decrypted = cipher.decrypt(encrypted)
print('AES-ECB decrypted:', decrypted)

CBC MODE

iv = uos.urandom(BLOCK_SIZE)
cipher = aes(key,MODE_CBC,iv)
ct_bytes = iv + cipher.encrypt(plaintext)
print ('AES-CBC encrypted:', ct_bytes)
iv = ct_bytes[:BLOCK_SIZE]
cipher = aes(key,MODE_CBC,iv)
decrypted = cipher.decrypt(ct_bytes)[BLOCK_SIZE:]
print('AES-CBC decrypted:', decrypted)

CTR MODE

Could somebody put the CTR MODE example??? I tried it for hours and an error in "syntax mode" is returned...

[jimmo]

The documentation is here: https://docs.micropython.org/en/latest/library/cryptolib.html

Could somebody put the CTR MODE example??? I tried it for hours and an error in "syntax mode" is returned...

@nastiliano Can you post your example that gives the error?

[nastiliano]

SOLVED:

Simply CTR MODE is not supported yet on the ESP32. Sorry....

Thank you everyone!!

PD: I'll implement the CBC MODE