#pragma once #include <stddef.h> #define HMAC_SHA256_RESULT_SIZE 32 /* Compute Hashed Message Authentication Code with SHA-256, over BUFFER data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the output to pre-allocated 32 byte minimum RESBUF buffer. Return 0 on success. */ int hmac_sha256(const void* key, size_t keylen, const void* in, size_t inlen, void* restrict resbuf);