/* * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #ifndef OSSL_CRYPTO_POLY1305_H # define OSSL_CRYPTO_POLY1305_H # pragma once #include <stddef.h> #define POLY1305_BLOCK_SIZE 16 #define POLY1305_DIGEST_SIZE 16 #define POLY1305_KEY_SIZE 32 typedef struct poly1305_context POLY1305; typedef void (*poly1305_blocks_f) (void *ctx, const unsigned char *inp, size_t len, unsigned int padbit); typedef void (*poly1305_emit_f) (void *ctx, unsigned char mac[16], const unsigned int nonce[4]); struct poly1305_context { double opaque[24]; /* large enough to hold internal state, declared * 'double' to ensure at least 64-bit invariant * alignment across all platforms and * configurations */ unsigned int nonce[4]; unsigned char data[POLY1305_BLOCK_SIZE]; size_t num; struct { poly1305_blocks_f blocks; poly1305_emit_f emit; } func; }; size_t Poly1305_ctx_size(void); void Poly1305_Init(POLY1305 *ctx, const unsigned char key[32]); void Poly1305_Update(POLY1305 *ctx, const unsigned char *inp, size_t len); void Poly1305_Final(POLY1305 *ctx, unsigned char mac[16]); #endif /* OSSL_CRYPTO_POLY1305_H */