hkdf.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * HKDF: HMAC-based Key Derivation Function (HKDF), RFC 5869
 4 *
 5 * Extracted from fs/crypto/hkdf.c, which has
 6 * Copyright 2019 Google LLC
 7 */
 8
 9#ifndef _CRYPTO_HKDF_H
10#define _CRYPTO_HKDF_H
11
12#include <crypto/hash.h>
13
14int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
15		 unsigned int ikmlen, const u8 *salt, unsigned int saltlen,
16		 u8 *prk);
17int hkdf_expand(struct crypto_shash *hmac_tfm,
18		const u8 *info, unsigned int infolen,
19		u8 *okm, unsigned int okmlen);
20#endif