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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Script that generates lib/crypto/fips-aes.h and lib/crypto/fips-sha.h
#
# Requires that python-cryptography be installed.
#
# Copyright 2025 Google LLC
import cryptography.hazmat.primitives.ciphers
import cryptography.hazmat.primitives.ciphers.aead
import cryptography.hazmat.primitives.cmac
import hashlib
import hmac
def print_static_u8_array_definition(file, name, value):
print("", file=file)
print(f"static const u8 {name}[] __initconst __maybe_unused = {{", file=file)
for i in range(0, len(value), 8):
line = "\t" + "".join(f"0x{b:02x}, " for b in value[i : i + 8])
print(f"{line.rstrip()}", file=file)
print("};", file=file)
def print_header(file):
print("/* SPDX-License-Identifier: GPL-2.0-or-later */", file=file)
print("/* This file was generated by: gen-fips-testvecs.py */", file=file)
print("/* clang-format off */", file=file)
print("", file=file)
print("#include <linux/fips.h>", file=file)
def gen_aes_test_data(file):
fips_test_data = b"fips test data\0\0"
fips_test_ad = b"fips test ad\0\0\0\0"
fips_test_iv = b"fips test iv\0\0\0\0"
fips_test_key = b"fips test key\0\0\0"
fips_test_xts_key = b"key1" + (b"\0" * 12) + b"key2" + (b"\0" * 12)
print_header(file)
print_static_u8_array_definition(file, "fips_test_data", fips_test_data)
print_static_u8_array_definition(file, "fips_test_ad", fips_test_ad)
print_static_u8_array_definition(file, "fips_test_iv", fips_test_iv)
print_static_u8_array_definition(file, "fips_test_key", fips_test_key)
print_static_u8_array_definition(file, "fips_test_xts_key", fips_test_xts_key)
aes = cryptography.hazmat.primitives.ciphers.algorithms.AES(fips_test_key)
# AES-CMAC
aes_cmac = cryptography.hazmat.primitives.cmac.CMAC(aes)
aes_cmac.update(fips_test_data)
print_static_u8_array_definition(
file, "fips_test_aes_cmac_value", aes_cmac.finalize()
)
# AES-ECB
cipher = cryptography.hazmat.primitives.ciphers.Cipher(
aes, cryptography.hazmat.primitives.ciphers.modes.ECB()
)
encryptor = cipher.encryptor()
ctext = encryptor.update(fips_test_data) + encryptor.finalize()
print_static_u8_array_definition(file, "fips_test_aes_ecb_ctext", ctext)
# AES-CBC
cipher = cryptography.hazmat.primitives.ciphers.Cipher(
aes, cryptography.hazmat.primitives.ciphers.modes.CBC(fips_test_iv)
)
encryptor = cipher.encryptor()
ctext = encryptor.update(fips_test_data) + encryptor.finalize()
print_static_u8_array_definition(file, "fips_test_aes_cbc_ctext", ctext)
# AES-CBC-CTS
cipher = cryptography.hazmat.primitives.ciphers.Cipher(
aes, cryptography.hazmat.primitives.ciphers.modes.CBC(fips_test_iv)
)
encryptor = cipher.encryptor()
ctext = encryptor.update(fips_test_data * 2) + encryptor.finalize()
ctext = ctext[16:32] + ctext[0:16]
print_static_u8_array_definition(file, "fips_test_aes_cbc_cts_ctext", ctext)
# AES-CTR
cipher = cryptography.hazmat.primitives.ciphers.Cipher(
aes, cryptography.hazmat.primitives.ciphers.modes.CTR(fips_test_iv)
)
encryptor = cipher.encryptor()
ctext = encryptor.update(fips_test_data) + encryptor.finalize()
print_static_u8_array_definition(file, "fips_test_aes_ctr_ctext", ctext)
# AES-XTS
cipher = cryptography.hazmat.primitives.ciphers.Cipher(
cryptography.hazmat.primitives.ciphers.algorithms.AES(fips_test_xts_key),
cryptography.hazmat.primitives.ciphers.modes.XTS(fips_test_iv),
)
encryptor = cipher.encryptor()
ctext = encryptor.update(fips_test_data) + encryptor.finalize()
print_static_u8_array_definition(file, "fips_test_aes_xts_ctext", ctext)
# AES-GCM
cipher = cryptography.hazmat.primitives.ciphers.aead.AESGCM(fips_test_key)
ct_and_tag = cipher.encrypt(
nonce=fips_test_iv[:12], data=fips_test_data, associated_data=fips_test_ad
)
print_static_u8_array_definition(
file, "fips_test_aes_gcm_ctext_and_tag", ct_and_tag
)
# AES-CCM
cipher = cryptography.hazmat.primitives.ciphers.aead.AESCCM(
fips_test_key, tag_length=16
)
ct_and_tag = cipher.encrypt(
nonce=fips_test_iv[:13], data=fips_test_data, associated_data=fips_test_ad
)
print_static_u8_array_definition(
file, "fips_test_aes_ccm_ctext_and_tag", ct_and_tag
)
def gen_sha_test_data(file):
fips_test_data = b"fips test data\0\0"
fips_test_key = b"fips test key\0\0\0"
print_header(file)
print_static_u8_array_definition(file, "fips_test_data", fips_test_data)
print_static_u8_array_definition(file, "fips_test_key", fips_test_key)
for alg in "sha1", "sha256", "sha512":
ctx = hmac.new(fips_test_key, digestmod=alg)
ctx.update(fips_test_data)
print_static_u8_array_definition(
file, f"fips_test_hmac_{alg}_value", ctx.digest()
)
print_static_u8_array_definition(
file, "fips_test_sha3_256_value", hashlib.sha3_256(fips_test_data).digest()
)
filename = "lib/crypto/fips-aes.h"
with open(filename, "w") as file:
print(f"Generating {filename}")
gen_aes_test_data(file)
filename = "lib/crypto/fips-sha.h"
with open(filename, "w") as file:
print(f"Generating {filename}")
gen_sha_test_data(file)
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