what is the output encoding of ucryptolib.encrypt ?

[vodkawasserfall]

hi!

Q1:
what is the output encoding of bytearray?

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bytearray(b'\xe4\xb3\x90\xc3\x0b\x80%\xb3\xc2\n\xc3nY\xdfv\xc9\xd3X8\x82Y\xd8\xd7\xbc\xd0\xafP\xbdJ~\xe5\xdf\x8a\xbc\x9cU\xfd\xa3\x9a\x8d\x1a\xed\xdd\x99\x9a\xa5Ll\xff\xaa\xef\xf0\xfbU)o\xb11\xacC\x981\x0b\xdf')

Q2:
i've tried encrypting strings on an ESP32 to decrypt it in php (webserver).
how do i encode data properly to exchange between µpython and php (and hopefully en/decrypt as well) ?
my code as of now: viewtopic.php?p=54291#p54291

[jimmo]

what is the output encoding of bytearray?

Not quite sure I understand what you're asking, but when MicroPython (and Python) print a bytes or bytearray object, it attempts to print like a regular string, but any byte that isn't a printable ascii character gets shown as \xAA (where AA is the hex of that byte).

i've tried encrypting strings on an ESP32 to decrypt it in php (webserver).

I think the issue there might be the handling of the key -- in the Python example, key is expected to be a 128-bit/256-bit (i.e. 16 or 32 bytes) bytearray. Whereas in the PHP example, the AES key is generated from the SHA1 of the password.

[vodkawasserfall]

Not quite sure I understand what you're asking, but when MicroPython (and Python) print a bytes or bytearray object, it attempts to print like a regular string, but any byte that isn't a printable ascii character gets shown as \xAA (where AA is the hex of that byte).

thanks! exactly what i meant.

I think the issue there might be the handling of the key -- in the Python example, key is expected to be a 128-bit/256-bit (i.e. 16 or 32 bytes) bytearray. Whereas in the PHP example, the AES key is generated from the SHA1 of the password.

thanks again. quiet obvious

now that i try to decrypt a message from php there's a buffer required.
tried creating preallocated bytearray() and array(), buffer() doesn't seem to exist on micropython, do i need to create an object?

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  File "mpyaes.py", line 117, in decrypt
TypeError: object with buffer protocol required

message tried to decode:

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b'\xfa3,\xa3\x1b\x9f\xcav\x0er\xa1\xac\\F\xffx\xc0\xc2_}\xfa\x00\xe5\xe6\xe9\xf5\x9d}>y>\x03\x85\xe1\xc8!MZ\x07\xea[\x9aN\xb7S\x1dz \x02n2\xf7l\xe5\xc8\xd5\xcaz\x14\x93\xc1\xb8L\x04'

[jimmo]

tried creating preallocated bytearray() and array(), buffer() doesn't seem to exist on micropython, do i need to create an object?

The "buffer protocol" is supported by objects like bytes, bytearray, str, etc.

Can you provide an example?

My guess is that mpyaes need it to be bytearray because it does the decryption in-place.

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    def decrypt(self, ciphertext: bytearray) -> bytearray:
        # Decrypts ciphertext in-place. Returns a zero-copy bytearray up to where
        # the padding begins.
        

So try:

msg = bytearray(b'.....')
result = aes.decrypt(msg)