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#include <openssl/aes.h>
11#include "prov/ciphercommon.h"
12
13#define OCB_MAX_TAG_LEN AES_BLOCK_SIZE
14#define OCB_MAX_DATA_LEN AES_BLOCK_SIZE
15#define OCB_MAX_AAD_LEN AES_BLOCK_SIZE
16
17typedef struct prov_aes_ocb_ctx_st {
18 PROV_CIPHER_CTX base; /* Must be first */
19 union {
20 OSSL_UNION_ALIGN;
21 AES_KEY ks;
22 } ksenc; /* AES key schedule to use for encryption/aad */
23 union {
24 OSSL_UNION_ALIGN;
25 AES_KEY ks;
26 } ksdec; /* AES key schedule to use for decryption */
27 OCB128_CONTEXT ocb;
28 unsigned int iv_state; /* set to one of IV_STATE_XXX */
29 unsigned int key_set : 1;
30 size_t taglen;
31 size_t data_buf_len;
32 size_t aad_buf_len;
33 unsigned char tag[OCB_MAX_TAG_LEN];
34 unsigned char data_buf[OCB_MAX_DATA_LEN]; /* Store partial data blocks */
35 unsigned char aad_buf[OCB_MAX_AAD_LEN]; /* Store partial AAD blocks */
36} PROV_AES_OCB_CTX;
37
38const PROV_CIPHER_HW *PROV_CIPHER_HW_aes_ocb(size_t keybits);
39