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

/*
 * Copyright (C) 2021, Stephan Mueller <[email protected]>
 */

#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 */