1/*
2 * Copyright 2019 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
18typedef 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
33typedef 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
43const PROV_CIPHER_HW *PROV_CIPHER_HW_chacha20_poly1305(size_t keybits);
44