misc/crypto/rot.py at be926d3ed018b1fde8ae62b95ba875a17af11c45 · daedalus/misc · GitHub

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get_bin = lambda x, n: format(x, "b").zfill(n)

mask = lambda max_bits: (1 << max_bits)-1

rol = lambda val, r_bits, max_bits: (val << r_bits % max_bits) & ((1 << max_bits) - 1) | (
    (val & ((1 << max_bits) - 1)) >> (max_bits - (r_bits % max_bits))
)

# Rotate right: 0b1001 --> 0b1100
ror = lambda val, r_bits, max_bits: (
    (val & ((1 << max_bits) - 1)) >> r_bits % max_bits
) | (val << (max_bits - (r_bits % max_bits)) & ((1 << max_bits) - 1))

max_bits = 16  # For fun, try 2, 17 or other arbitrary (positive!) values

value = 1
i = 2
max_bits = 256
print(get_bin(value, max_bits))
print(get_bin(rol(value, i, max_bits), max_bits))
print(get_bin(ror(value, i, max_bits), max_bits))