mirror of
https://github.com/Abdess/retroarch_system.git
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55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
"""otp.bin decrypts with the standard library alone.
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The build promises stdlib + pyyaml. AES needed cryptography, pycryptodome
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or an openssl binary, and verify.py raised RuntimeError on otp.bin for a
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contributor with none of them.
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"""
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from __future__ import annotations
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import ast
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import sys
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import unittest
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from pathlib import Path
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REPO_ROOT = Path(__file__).resolve().parents[1]
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sys.path.insert(0, str(REPO_ROOT / "scripts"))
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import crypto_verify # noqa: E402
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STDLIB_OR_LOCAL = {"__future__", "hashlib", "struct", "collections", "pathlib", "sect233r1"}
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class StdlibAes(unittest.TestCase):
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def test_fips_197_vector(self):
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key = bytes.fromhex("000102030405060708090a0b0c0d0e0f")
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cipher = bytes.fromhex("69c4e0d86a7b0430d8cdb78070b4c55a")
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plain = crypto_verify._decrypt_block(cipher, crypto_verify._expand_key(key))
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self.assertEqual(plain.hex(), "00112233445566778899aabbccddeeff")
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def test_cbc_chains_blocks(self):
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# NIST SP 800-38A F.2.2, CBC-AES128 decrypt, first two blocks.
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key = bytes.fromhex("2b7e151628aed2a6abf7158809cf4f3c")
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iv = bytes.fromhex("000102030405060708090a0b0c0d0e0f")
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cipher = bytes.fromhex(
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"7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b2"
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)
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self.assertEqual(
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crypto_verify._aes_128_cbc_decrypt(cipher, key, iv).hex(),
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"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51",
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)
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def test_no_third_party_import(self):
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tree = ast.parse((REPO_ROOT / "scripts" / "crypto_verify.py").read_text())
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modules = {
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(node.module if isinstance(node, ast.ImportFrom) else alias.name).split(".")[0]
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for node in ast.walk(tree)
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if isinstance(node, (ast.Import, ast.ImportFrom))
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for alias in node.names
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}
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self.assertLessEqual(modules, STDLIB_OR_LOCAL)
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if __name__ == "__main__":
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unittest.main()
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