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3241cd0c6c
Separate out the HKDF functions into a separate module to to make them available to other callers. And add a testsuite to the module with test vectors from RFC 5869 (and additional vectors for SHA384 and SHA512) to ensure the integrity of the algorithm. Signed-off-by: Hannes Reinecke <hare@kernel.org> Acked-by: Eric Biggers <ebiggers@kernel.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Keith Busch <kbusch@kernel.org>
20 lines
524 B
C
20 lines
524 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* HKDF: HMAC-based Key Derivation Function (HKDF), RFC 5869
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*
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* Extracted from fs/crypto/hkdf.c, which has
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* Copyright 2019 Google LLC
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*/
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#ifndef _CRYPTO_HKDF_H
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#define _CRYPTO_HKDF_H
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#include <crypto/hash.h>
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int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
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unsigned int ikmlen, const u8 *salt, unsigned int saltlen,
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u8 *prk);
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int hkdf_expand(struct crypto_shash *hmac_tfm,
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const u8 *info, unsigned int infolen,
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u8 *okm, unsigned int okmlen);
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#endif
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