1/* SPDX-License-Identifier: GPL-2.0 */
 2
 3/*
 4 * Copyright (C) 2021, Stephan Mueller <smueller@chronox.de>
 5 */
 6
 7#ifndef _CRYPTO_KDF_SELFTEST_H
 8#define _CRYPTO_KDF_SELFTEST_H
 9
10#include <crypto/hash.h>
11#include <linux/uio.h>
12
13struct kdf_testvec {
14	unsigned char *key;
15	size_t keylen;
16	unsigned char *ikm;
17	size_t ikmlen;
18	struct kvec info;
19	unsigned char *expected;
20	size_t expectedlen;
21};
22
23static inline int
24kdf_test(const struct kdf_testvec *test, const char *name,
25	 int (*crypto_kdf_setkey)(struct crypto_shash *kmd,
26				  const u8 *key, size_t keylen,
27				  const u8 *ikm, size_t ikmlen),
28	 int (*crypto_kdf_generate)(struct crypto_shash *kmd,
29				    const struct kvec *info,
30				    unsigned int info_nvec,
31				    u8 *dst, unsigned int dlen))
32{
33	struct crypto_shash *kmd;
34	int ret;
35	u8 *buf = kzalloc(test->expectedlen, GFP_KERNEL);
36
37	if (!buf)
38		return -ENOMEM;
39
40	kmd = crypto_alloc_shash(name, 0, 0);
41	if (IS_ERR(kmd)) {
42		pr_err("alg: kdf: could not allocate hash handle for %s\n",
43		       name);
44		kfree(buf);
45		return -ENOMEM;
46	}
47
48	ret = crypto_kdf_setkey(kmd, test->key, test->keylen,
49				test->ikm, test->ikmlen);
50	if (ret) {
51		pr_err("alg: kdf: could not set key derivation key\n");
52		goto err;
53	}
54
55	ret = crypto_kdf_generate(kmd, &test->info, 1, buf, test->expectedlen);
56	if (ret) {
57		pr_err("alg: kdf: could not obtain key data\n");
58		goto err;
59	}
60
61	ret = memcmp(test->expected, buf, test->expectedlen);
62	if (ret)
63		ret = -EINVAL;
64
65err:
66	crypto_free_shash(kmd);
67	kfree(buf);
68	return ret;
69}
70
71#endif /* _CRYPTO_KDF_SELFTEST_H */