58 lines
1.5 KiB
C
Executable File
58 lines
1.5 KiB
C
Executable File
/*
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* Cryptographic API.
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*
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* HMAC: Keyed-Hashing for Message Authentication (RFC2104).
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* SHA-256 is used as an underlying hash function.
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*
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* Author : Igor Shcheglakov (i.shcheglako@samsung.com)
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* Date : 15 Dec 2017
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*
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* Copyright (C) 2017 Samsung Electronics Co., Ltd.
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*
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*/
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#ifndef _FMP_HMAC_SHA256_H
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#define _FMP_HMAC_SHA256_H
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#include "sha256.h"
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struct hmac_sha256_ctx {
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struct shash_desc inner_ctx;
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struct shash_desc outer_ctx;
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};
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typedef struct hmac_sha256_ctx HMAC_SHA256_CTX;
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/* Initialize hashing context using a key of key_len bytes.
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*
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* Return zero on success and negative otherwise
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*/
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int hmac_sha256_init(struct hmac_sha256_ctx *ctx, const u8 *key, unsigned int key_len);
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/* Hash data_len bytes of data
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*
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* Return zero on success and negative otherwise
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*/
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int hmac_sha256_update(struct hmac_sha256_ctx *ctx, const u8 *data, unsigned int data_len);
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/* Add final padding to a hash and write resulting HMAC to out.
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* There must be at least SHA256_DIGEST_LENGTH bytes of space in out
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*
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* Return zero on success and negative otherwise
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*/
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int hmac_sha256_final(struct hmac_sha256_ctx *ctx, u8 *out);
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/* Hash data_len bytes of data using key of key_len bytes.
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* Write resulting HMAC to out. There must be at least SHA256_DIGEST_LENGTH
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* bytes of space in out
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*
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* Return zero on success and negative otherwise
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*/
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int hmac_sha256(const u8 *key, unsigned int key_len, const u8 *data, unsigned int data_len, u8 *out);
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/* Cleanup allocated resources */
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void hmac_sha256_ctx_cleanup(struct hmac_sha256_ctx *ctx);
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#endif /* _FMP_HMAC_SHA256_H */
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