JMR-devandClaude Opus 4.8
d407298be4
- Cover the new utilities helpers (unpad, crc32, checksumPid type preservation, pidFromSerial, safe_join) and drop the now-redundant per-module crc32 tests. - Rename test_unpad_removes_pkcs7_padding to reflect that unpad only trusts the trailing pad-length byte rather than validating PKCS#7. - Replace the KOBO_HASH_KEYS change-detector with a test that documents the intentional value pin and checks the ASCII-salt contract. - Note kgenpids' hybrid import in the test-loader docstring. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
"""Tests for mobidedrm helpers."""
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import pytest
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import dedrm_test_utils as U
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md = U.load("mobidedrm", package="dedrm")
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def test_pc1_roundtrip():
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key = bytes(range(16))
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plaintext = b"cookie-data-1234"
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ciphertext = md.PC1(key, plaintext, decryption=False)
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assert ciphertext != plaintext
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assert md.PC1(key, ciphertext, decryption=True) == plaintext
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def test_pc1_rejects_bad_key_length():
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with pytest.raises(Exception, match="Bad key length"):
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md.PC1(b"\x00" * 8, b"data............", decryption=False)
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def test_trailing_data_entries():
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buf = b"XXXX" + bytes([0x82])
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# bit 1 set -> one size entry encoded in the final byte (0x82 -> 2)
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assert md.getSizeOfTrailingDataEntries(buf, len(buf), 0b10) == 2
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# no flags -> no trailing data
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assert md.getSizeOfTrailingDataEntries(buf, len(buf), 0) == 0
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# bit 0 set -> multibyte entry: (last_byte & 3) + 1
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assert md.getSizeOfTrailingDataEntries(b"ABCDE", 5, 1) == 2
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def test_checksum_pid_str_contract():
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# mobidedrm's call sites pass and expect ``str``; the shared helper must
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# preserve that (unlike the bytes contract used by kgenpids/kindlepid).
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out = md.checksumPid("12345678")
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assert out == "12345678EL"
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assert isinstance(out, str)
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