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 
18 typedef 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 
39 const PROV_CIPHER_HW *ossl_prov_cipher_hw_aes_ocb(size_t keybits);
40