/* SPDX-License-Identifier: GPL-2.0 */

/*
 * Copyright (C) 2021, Stephan Mueller <smueller@chronox.de>
 */

#ifndef _CRYPTO_KDF_SELFTEST_H
#define _CRYPTO_KDF_SELFTEST_H

#include <crypto/hash.h>
#include <linux/uio.h>

struct kdf_testvec {
        unsigned char *key;
        size_t keylen;
        unsigned char *ikm;
        size_t ikmlen;
        struct kvec info;
        unsigned char *expected;
        size_t expectedlen;
};

static inline int
kdf_test(const struct kdf_testvec *test, const char *name,
         int (*crypto_kdf_setkey)(struct crypto_shash *kmd,
                                  const u8 *key, size_t keylen,
                                  const u8 *ikm, size_t ikmlen),
         int (*crypto_kdf_generate)(struct crypto_shash *kmd,
                                    const struct kvec *info,
                                    unsigned int info_nvec,
                                    u8 *dst, unsigned int dlen))
{
        struct crypto_shash *kmd;
        int ret;
        u8 *buf = kzalloc(test->expectedlen, GFP_KERNEL);

        if (!buf)
                return -ENOMEM;

        kmd = crypto_alloc_shash(name, 0, 0);
        if (IS_ERR(kmd)) {
                pr_err("alg: kdf: could not allocate hash handle for %s\n",
                       name);
                kfree(buf);
                return -ENOMEM;
        }

        ret = crypto_kdf_setkey(kmd, test->key, test->keylen,
                                test->ikm, test->ikmlen);
        if (ret) {
                pr_err("alg: kdf: could not set key derivation key\n");
                goto err;
        }

        ret = crypto_kdf_generate(kmd, &test->info, 1, buf, test->expectedlen);
        if (ret) {
                pr_err("alg: kdf: could not obtain key data\n");
                goto err;
        }

        ret = memcmp(test->expected, buf, test->expectedlen);
        if (ret)
                ret = -EINVAL;

err:
        crypto_free_shash(kmd);
        kfree(buf);
        return ret;
}

#endif /* _CRYPTO_KDF_SELFTEST_H */