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61 lines
1.3 KiB
Python
61 lines
1.3 KiB
Python
"""Seed
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INTERNAL
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Helper methods to generate and manipulate random seeds.
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"""
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import os
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import base64
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SEED_BYTES = 32
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SEED_STR_LEN = 44
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def _bytes_to_base64(arr: bytes) -> str:
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return base64.standard_b64encode(arr).decode()
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def _base64_to_bytes(b64_str: str) -> bytes:
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return base64.standard_b64decode(b64_str)
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def string_from_seed(seed: bytes) -> str:
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"""Convert bytes to a base64 string seed.
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Args:
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seed (bytes): Raw, random bytes of length SEED_BYTES.
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Returns:
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str: The seed string, of length SEED_STR_LEN.
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"""
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assert len(seed) == SEED_BYTES
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seed_str = _bytes_to_base64(seed)
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assert len(seed_str) == SEED_STR_LEN
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return seed_str
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def seed_from_string(seed_str: str) -> bytes:
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"""Convert a base64 string seed to bytes.
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Args:
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seed_str (str): The seed string, of length SEED_STR_LEN.
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Returns:
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bytes: The raw bytes, of length SEED_BYTES.
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"""
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assert len(seed_str) == SEED_STR_LEN
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seed = _base64_to_bytes(seed_str)
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assert len(seed) == SEED_BYTES
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return seed
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def get_random_seed() -> str:
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"""Generate a random seed using `os.urandom`.
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Returns:
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str: The seed string, of length SEED_STR_LEN.
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"""
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seed = os.urandom(SEED_BYTES)
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return string_from_seed(seed)
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