encryption_utils
interleave(data)
Interleaves a sequence of bytes. When encrypting EO data, bytes are "woven" into each other.
Used when encrypting packets and data files.
Example
[0, 1, 2, 3, 4, 5] -> [0, 5, 1, 4, 2, 3]
This is an in-place operation.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
data |
bytearray
|
The data to interleave. |
required |
Source code in src/eolib/encrypt/encryption_utils.py
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deinterleave(data)
Deinterleaves a sequence of bytes. This is the reverse of interleave.
Used when decrypting packets and data files.
Example
[0, 1, 2, 3, 4, 5] -> [0, 2, 4, 5, 3, 1]
This is an in-place operation.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
data |
bytearray
|
The data to deinterleave. |
required |
Source code in src/eolib/encrypt/encryption_utils.py
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flip_msb(data)
Flips the most significant bits of each byte in a sequence of bytes. (Values 0 and 128 are not flipped.)
Used when encrypting and decrypting packets.
Example
[0, 1, 127, 128, 129, 254, 255] -> [0, 129, 255, 128, 1, 126, 127]
This is an in-place operation.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
data |
bytearray
|
The data to flip most significant bits on. |
required |
Source code in src/eolib/encrypt/encryption_utils.py
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swap_multiples(data, multiple)
Swaps the order of contiguous bytes in a sequence of bytes that are divisible by a given multiple value.
Used when encrypting and decrypting packets and data files.
Example
multiple = 3
[10, 21, 27] -> [10, 27, 21]
This is an in-place operation.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
data |
bytearray
|
The data to swap bytes in. |
required |
multiple |
int
|
The multiple value. |
required |
Raises: ValueError: If multiple is less than 1.
Source code in src/eolib/encrypt/encryption_utils.py
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