unleashed-firmware/applications/external/totp/services/hmac/hmac_sha512.h

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#pragma once
#include <stddef.h>
#define HMAC_SHA512_RESULT_SIZE 64
/* Compute Hashed Message Authentication Code with SHA-512, over BUFFER
data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
output to pre-allocated 64 byte minimum RESBUF buffer. Return 0 on
success. */
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int hmac_sha512(const void* key, size_t keylen, const void* in, size_t inlen, void* restrict resbuf);