1 /* 2 * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #ifndef OSSL_CRYPTO_POLY1305_H 11 # define OSSL_CRYPTO_POLY1305_H 12 # pragma once 13 14 #include <stddef.h> 15 16 #define POLY1305_BLOCK_SIZE 16 17 #define POLY1305_DIGEST_SIZE 16 18 #define POLY1305_KEY_SIZE 32 19 20 typedef struct poly1305_context POLY1305; 21 22 typedef void (*poly1305_blocks_f) (void *ctx, const unsigned char *inp, 23 size_t len, unsigned int padbit); 24 typedef void (*poly1305_emit_f) (void *ctx, unsigned char mac[16], 25 const unsigned int nonce[4]); 26 27 struct poly1305_context { 28 double opaque[24]; /* large enough to hold internal state, declared 29 * 'double' to ensure at least 64-bit invariant 30 * alignment across all platforms and 31 * configurations */ 32 unsigned int nonce[4]; 33 unsigned char data[POLY1305_BLOCK_SIZE]; 34 size_t num; 35 struct { 36 poly1305_blocks_f blocks; 37 poly1305_emit_f emit; 38 } func; 39 }; 40 41 size_t Poly1305_ctx_size(void); 42 void Poly1305_Init(POLY1305 *ctx, const unsigned char key[32]); 43 void Poly1305_Update(POLY1305 *ctx, const unsigned char *inp, size_t len); 44 void Poly1305_Final(POLY1305 *ctx, unsigned char mac[16]); 45 46 #endif /* OSSL_CRYPTO_POLY1305_H */ 47