providers/implementations/ciphers/cipher_chacha20_poly1305.h

   1 /*
   2  * Copyright 2019-2020 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 /* Dispatch functions for chacha20_poly1305 cipher */
  11
  12 #include "include/crypto/poly1305.h"
  13 #include "cipher_chacha20.h"
  14
  15 #define NO_TLS_PAYLOAD_LENGTH ((size_t)-1)
  16 #define CHACHA20_POLY1305_IVLEN 12
  17
  18 typedef struct {
  19     PROV_CIPHER_CTX base;       /* must be first */
  20     PROV_CHACHA20_CTX chacha;
  21     POLY1305 poly1305;
  22     unsigned int nonce[12 / 4];
  23     unsigned char tag[POLY1305_BLOCK_SIZE];
  24     unsigned char tls_aad[POLY1305_BLOCK_SIZE];
  25     struct { uint64_t aad, text; } len;
  26     unsigned int aad : 1;
  27     unsigned int mac_inited : 1;
  28     size_t tag_len, nonce_len;
  29     size_t tls_payload_length;
  30     size_t tls_aad_pad_sz;
  31 } PROV_CHACHA20_POLY1305_CTX;
  32
  33 typedef struct prov_cipher_hw_chacha_aead_st {
  34     PROV_CIPHER_HW base; /* must be first */
  35     int (*aead_cipher)(PROV_CIPHER_CTX *dat, unsigned char *out, size_t *outl,
  36                        const unsigned char *in, size_t len);
  37     int (*initiv)(PROV_CIPHER_CTX *ctx);
  38     int (*tls_init)(PROV_CIPHER_CTX *ctx, unsigned char *aad, size_t alen);
  39     int (*tls_iv_set_fixed)(PROV_CIPHER_CTX *ctx, unsigned char *fixed,
  40                             size_t flen);
  41 } PROV_CIPHER_HW_CHACHA20_POLY1305;
  42
  43 const PROV_CIPHER_HW *ossl_prov_cipher_hw_chacha20_poly1305(size_t keybits);