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/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2021, Stephan Mueller <smueller@chronox.de> */ #ifndef _CRYPTO_KDF108_H #define _CRYPTO_KDF108_H #include <crypto/hash.h> #include <linux/uio.h> /** * Counter KDF generate operation according to SP800-108 section 5.1 * as well as SP800-56A section 5.8.1 (Single-step KDF). * * @kmd Keyed message digest whose key was set with crypto_kdf108_setkey or * unkeyed message digest * @info optional context and application specific information - this may be * NULL * @info_vec number of optional context/application specific information entries * @dst destination buffer that the caller already allocated * @dlen length of the destination buffer - the KDF derives that amount of * bytes. * * To comply with SP800-108, the caller must provide Label || 0x00 || Context * in the info parameter. * * @return 0 on success, < 0 on error */ int crypto_kdf108_ctr_generate(struct crypto_shash *kmd, const struct kvec *info, unsigned int info_nvec, u8 *dst, unsigned int dlen); /** * Counter KDF setkey operation * * @kmd Keyed message digest allocated by the caller. The key should not have * been set. * @key Seed key to be used to initialize the keyed message digest context. * @keylen This length of the key buffer. * @ikm The SP800-108 KDF does not support IKM - this parameter must be NULL * @ikmlen This parameter must be 0. * * According to SP800-108 section 7.2, the seed key must be at least as large as * the message digest size of the used keyed message digest. This limitation * is enforced by the implementation. * * SP800-108 allows the use of either a HMAC or a hash primitive. When * the caller intends to use a hash primitive, the call to * crypto_kdf108_setkey is not required and the key derivation operation can * immediately performed using crypto_kdf108_ctr_generate after allocating * a handle. * * @return 0 on success, < 0 on error */ int crypto_kdf108_setkey(struct crypto_shash *kmd, const u8 *key, size_t keylen, const u8 *ikm, size_t ikmlen); #endif /* _CRYPTO_KDF108_H */