chachapoly.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
 
#ifndef MBEDTLS_CHACHAPOLY_H
#define MBEDTLS_CHACHAPOLY_H
#include "mbedtls/private_access.h"
 
#include "mbedtls/build_info.h"
 
/* for shared error codes */
#include "mbedtls/poly1305.h"

#define MBEDTLS_ERR_CHACHAPOLY_BAD_STATE            -0x0054
#define MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED          -0x0056
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef enum {
    MBEDTLS_CHACHAPOLY_ENCRYPT,     
    MBEDTLS_CHACHAPOLY_DECRYPT      
}
mbedtls_chachapoly_mode_t;
 
#if !defined(MBEDTLS_CHACHAPOLY_ALT)
 
#include "mbedtls/chacha20.h"
 
typedef struct mbedtls_chachapoly_context {
    mbedtls_chacha20_context MBEDTLS_PRIVATE(chacha20_ctx);  
    mbedtls_poly1305_context MBEDTLS_PRIVATE(poly1305_ctx);  
    uint64_t MBEDTLS_PRIVATE(aad_len);                       
    uint64_t MBEDTLS_PRIVATE(ciphertext_len);                
    int MBEDTLS_PRIVATE(state);                              
    mbedtls_chachapoly_mode_t MBEDTLS_PRIVATE(mode);         
}
mbedtls_chachapoly_context;
 
#else /* !MBEDTLS_CHACHAPOLY_ALT */
#include "chachapoly_alt.h"
#endif /* !MBEDTLS_CHACHAPOLY_ALT */

void mbedtls_chachapoly_init(mbedtls_chachapoly_context *ctx);

void mbedtls_chachapoly_free(mbedtls_chachapoly_context *ctx);

int mbedtls_chachapoly_setkey(mbedtls_chachapoly_context *ctx,
                              const unsigned char key[32]);

int mbedtls_chachapoly_starts(mbedtls_chachapoly_context *ctx,
                              const unsigned char nonce[12],
                              mbedtls_chachapoly_mode_t mode);

int mbedtls_chachapoly_update_aad(mbedtls_chachapoly_context *ctx,
                                  const unsigned char *aad,
                                  size_t aad_len);

int mbedtls_chachapoly_update(mbedtls_chachapoly_context *ctx,
                              size_t len,
                              const unsigned char *input,
                              unsigned char *output);

int mbedtls_chachapoly_finish(mbedtls_chachapoly_context *ctx,
                              unsigned char mac[16]);

int mbedtls_chachapoly_encrypt_and_tag(mbedtls_chachapoly_context *ctx,
                                       size_t length,
                                       const unsigned char nonce[12],
                                       const unsigned char *aad,
                                       size_t aad_len,
                                       const unsigned char *input,
                                       unsigned char *output,
                                       unsigned char tag[16]);

int mbedtls_chachapoly_auth_decrypt(mbedtls_chachapoly_context *ctx,
                                    size_t length,
                                    const unsigned char nonce[12],
                                    const unsigned char *aad,
                                    size_t aad_len,
                                    const unsigned char tag[16],
                                    const unsigned char *input,
                                    unsigned char *output);
 
#if defined(MBEDTLS_SELF_TEST)
int mbedtls_chachapoly_self_test(int verbose);
#endif /* MBEDTLS_SELF_TEST */
 
#ifdef __cplusplus
}
#endif
 
#endif /* MBEDTLS_CHACHAPOLY_H */