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#include <openssl/aes.h>
11#include "prov/ciphercommon.h"
12#include "crypto/aes_platform.h"
13
14#define OCB_MAX_TAG_LEN     AES_BLOCK_SIZE
15#define OCB_MAX_DATA_LEN    AES_BLOCK_SIZE
16#define OCB_MAX_AAD_LEN     AES_BLOCK_SIZE
17
18typedef struct prov_aes_ocb_ctx_st {
19    PROV_CIPHER_CTX base;       /* Must be first */
20    union {
21        OSSL_UNION_ALIGN;
22        AES_KEY ks;
23    } ksenc;                    /* AES key schedule to use for encryption/aad */
24    union {
25        OSSL_UNION_ALIGN;
26        AES_KEY ks;
27    } ksdec;                    /* AES key schedule to use for decryption */
28    OCB128_CONTEXT ocb;
29    unsigned int iv_state;      /* set to one of IV_STATE_XXX */
30    unsigned int key_set : 1;
31    size_t taglen;
32    size_t data_buf_len;
33    size_t aad_buf_len;
34    unsigned char tag[OCB_MAX_TAG_LEN];
35    unsigned char data_buf[OCB_MAX_DATA_LEN]; /* Store partial data blocks */
36    unsigned char aad_buf[OCB_MAX_AAD_LEN];   /* Store partial AAD blocks */
37} PROV_AES_OCB_CTX;
38
39const PROV_CIPHER_HW *ossl_prov_cipher_hw_aes_ocb(size_t keybits);
40