AES Decrypt

Category: Ciphers

Status: Registered and callable in the CyberChef 11.3.0 compatibility inventory.

Input / output: string → string

Background: https://wikipedia.org/wiki/Advanced_Encryption_Standard

What it does

Advanced Encryption Standard (AES) is a U.S. Federal Information Processing Standard (FIPS). It was selected after a 5-year process where 15 competing designs were evaluated. Key: The following algorithms will be used based on the size of the key:

16 bytes = AES-128
24 bytes = AES-192
32 bytes = AES-256

IV: The Initialization Vector should be 16 bytes long. If not entered, it will default to 16 null bytes. Padding: In CBC and ECB mode, PKCS#7 padding will be used as a default. GCM Tag: This field is ignored unless ‘GCM’ mode is used.

Note

Status here means the operation name is implemented and callable. It does not by itself promise byte-for-byte parity for every upstream option. See Compatibility and current status for the verified scope and known boundaries.

Arguments and options

Arguments are positional. Keep their order when using bake() or Pipeline.then().

Index	Name	UI type	PyChef default	Accepted values / format
`0`	Key	`toggleString`	`{'string': '', 'option': 'Hex'}`	`''`
`1`	IV	`toggleString`	`{'string': '', 'option': 'Hex'}`	`''`
`2`	IV Length	`number`	`16`	A Python integer or floating-point value
`3`	Mode	`argSelector`	`'CBC'`	`'CBC'`, `'CFB'`, `'OFB'`, `'CTR'`, `'GCM'`, `'ECB'`, `'CBC/NoPadding'`, `'ECB/NoPadding'`
`4`	Input	`option`	`'Hex'`	`'Hex'`, `'Raw'`
`5`	Output	`option`	`'Raw'`	`'Raw'`, `'Hex'`
`6`	GCM Tag	`toggleString`	`{'string': '', 'option': 'Hex'}`	`''`
`7`	Additional Authenticated Data	`toggleString`	`{'string': '', 'option': 'Hex'}`	`''`
`8`	IV from input	`argSelector`	`'Off'`	`'Off'`, `'From start'`, `'From end'`

Recipe template

Important

This is a call template built from the documented defaults. Replace placeholder values such as empty keys, paths, patterns, or lookup data before running it.

from pychef import bake

input_value = "example"
args = [{'string': '', 'option': 'Hex'}, {'string': '', 'option': 'Hex'}, 16, 'CBC', 'Hex', 'Raw', {'string': '', 'option': 'Hex'}, {'string': '', 'option': 'Hex'}, 'Off']
result = bake(input_value, [{"op": 'AES Decrypt', "args": args}])
print(result)

Pipeline example

from pychef import Pipeline

args = [{'string': '', 'option': 'Hex'}, {'string': '', 'option': 'Hex'}, 16, 'CBC', 'Hex', 'Raw', {'string': '', 'option': 'Hex'}, {'string': '', 'option': 'Hex'}, 'Off']
transform = Pipeline().then('AES Decrypt', *args)
result = transform("example")

Dedicated operation module

The registered entry point lives in pychef.operations.by_operation.aes_decrypt. Direct calls receive the input value and a positional argument tuple:

from pychef.operations.by_operation.aes_decrypt import run

result = run("example", tuple([{'string': '', 'option': 'Hex'}, {'string': '', 'option': 'Hex'}, 16, 'CBC', 'Hex', 'Raw', {'string': '', 'option': 'Hex'}, {'string': '', 'option': 'Hex'}, 'Off']))

pychef.operations.by_operation.aes_decrypt.run(value, args)

Run this operation using its shared internal implementation.

Parameters:

value (str | bytes)
args (Sequence[Any])

Return type:

str | bytes