chacha20poly1305.h

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/*
 * Copyright (C) 2018 Koen Zandberg
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include "crypto/poly1305.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define CHACHA20POLY1305_KEY_BYTES      (32U)   
#define CHACHA20POLY1305_NONCE_BYTES    (12U)   
#define CHACHA20POLY1305_TAG_BYTES      (16U)   

typedef union {
    /* We need both the state matrix and the poly1305 state, but nearly not at
     * the same time. This works as long as the first 8 members of state
     * overlap fully or completely not with the first and second key parts
     * from the @ref poly1305_ctx_t struct */
    uint32_t state[16];     
    poly1305_ctx_t poly;    
} chacha20poly1305_ctx_t;

void chacha20poly1305_encrypt(uint8_t *cipher, const uint8_t *msg,
                              size_t msglen, const uint8_t *aad, size_t aadlen,
                              const uint8_t *key, const uint8_t *nonce);

int chacha20poly1305_decrypt(const uint8_t *cipher, size_t cipherlen,
                             uint8_t *msg, size_t *msglen,
                             const uint8_t *aad, size_t aadlen,
                             const uint8_t *key, const uint8_t *nonce);

void chacha20_encrypt_decrypt(const uint8_t *input, uint8_t *output,
                             const uint8_t *key, const uint8_t *nonce,
                             size_t inputlen);
 
#ifdef __cplusplus
}
#endif