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2505f9157e
Add a FIPS cryptographic algorithm self-test for AES-CMAC to fulfill the self-test requirement when this code is built into a FIPS 140 cryptographic module. This provides parity with the traditional crypto API, which uses crypto/testmgr.c to meet the FIPS self-test requirement. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20260218213501.136844-8-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
47 lines
1.6 KiB
Python
Executable File
47 lines
1.6 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Script that generates lib/crypto/fips.h
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#
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# Requires that python-cryptography be installed.
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#
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# Copyright 2025 Google LLC
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import cryptography.hazmat.primitives.ciphers
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import cryptography.hazmat.primitives.cmac
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import hashlib
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import hmac
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fips_test_data = b"fips test data\0\0"
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fips_test_key = b"fips test key\0\0\0"
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def print_static_u8_array_definition(name, value):
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print('')
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print(f'static const u8 {name}[] __initconst __maybe_unused = {{')
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for i in range(0, len(value), 8):
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line = '\t' + ''.join(f'0x{b:02x}, ' for b in value[i:i+8])
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print(f'{line.rstrip()}')
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print('};')
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print('/* SPDX-License-Identifier: GPL-2.0-or-later */')
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print(f'/* This file was generated by: gen-fips-testvecs.py */')
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print()
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print('#include <linux/fips.h>')
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print_static_u8_array_definition("fips_test_data", fips_test_data)
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print_static_u8_array_definition("fips_test_key", fips_test_key)
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for alg in 'sha1', 'sha256', 'sha512':
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ctx = hmac.new(fips_test_key, digestmod=alg)
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ctx.update(fips_test_data)
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print_static_u8_array_definition(f'fips_test_hmac_{alg}_value', ctx.digest())
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print_static_u8_array_definition(f'fips_test_sha3_256_value',
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hashlib.sha3_256(fips_test_data).digest())
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aes = cryptography.hazmat.primitives.ciphers.algorithms.AES(fips_test_key)
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aes_cmac = cryptography.hazmat.primitives.cmac.CMAC(aes)
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aes_cmac.update(fips_test_data)
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print_static_u8_array_definition('fips_test_aes_cmac_value',
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aes_cmac.finalize())
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