45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef HKDF_H
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#define HKDF_H
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#include <types.h>
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/*
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* FUNCTION
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* hkdf_sha256
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*
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* Description
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* HMAC-based Extract-and-Expand Key Derivation Function.
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*
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* Parameters:
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* out_key Pointer to key buffer which is used to save
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* hkdf_sha256 result
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* out_len The length of out_key
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* secret Pointer to input keying material
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* secret_len The length of secret
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* salt Pointer to salt buffer, it is optional
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* if not provided (salt == NULL), it is set internally
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* to a string of hashlen(32) zeros
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* salt_len The length of the salt value
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* Ignored if salt is NULL
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* info Pointer to application specific information, it is
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* optional
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* Ignored if info == NULL or a zero-length string
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* info_len: The length of the info, ignored if info is NULL
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*
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* OUTPUTS
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* 1 - Success
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* 0 - Failure
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*/
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int hkdf_sha256(uint8_t *out_key, size_t out_len,
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const uint8_t *secret, size_t secret_len,
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const uint8_t *salt, size_t salt_len,
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const uint8_t *info, size_t info_len);
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#endif /* HKDF_H */
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