Show Base64 offsets

Category: Encoding

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

Input / output: byteArray → html

Background: https://wikipedia.org/wiki/Base64#Output_padding

What it does

When a string is within a block of data and the whole block is Base64’d, the string itself could be represented in Base64 in three distinct ways depending on its offset within the block. This operation shows all possible offsets for a given string so that each possible encoding can be considered.

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`	Alphabet	`binaryString`	`'A-Za-z0-9+/='`	`'A-Za-z0-9+/='`
`1`	Show variable chars and padding	`boolean`	`True`	`True` or `False`
`2`	Input format	`option`	`'Raw'`	`'Raw'`, `'Base64'`

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 = b"example"
args = ['A-Za-z0-9+/=', True, 'Raw']
result = bake(input_value, [{"op": 'Show Base64 offsets', "args": args}])
print(result)

Pipeline example

from pychef import Pipeline

args = ['A-Za-z0-9+/=', True, 'Raw']
transform = Pipeline().then('Show Base64 offsets', *args)
result = transform(b"example")

Direct call

pychef.ops.run_operation runs any registered operation as a plain function, under the active ExecutionPolicy (safe defaults, no network):

from pychef.ops import run_operation

args = ['A-Za-z0-9+/=', True, 'Raw']
result = run_operation('Show Base64 offsets', b"example", args=args)

Common operations also have typed helpers in Direct operations.

Low-level operation module

Warning

The module below is an internal implementation detail. It applies no execution policy, resource limits, or error sanitization; prefer bake(), Pipeline, or pychef.ops for application code.

The registered entry point lives in pychef.operations.by_operation.show_base64_offsets. Direct calls receive the input value and a positional argument tuple:

from pychef.operations.by_operation.show_base64_offsets import run

result = run(b"example", tuple(['A-Za-z0-9+/=', True, 'Raw']))

pychef.operations.by_operation.show_base64_offsets.run(value, args)

Run this operation using its shared internal implementation.

Parameters:

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

Return type:

str | bytes