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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/aes.h>
#include "internal/ciphers/ciphercommon.h"
#define OCB_MAX_TAG_LEN AES_BLOCK_SIZE
#define OCB_MAX_DATA_LEN AES_BLOCK_SIZE
#define OCB_MAX_AAD_LEN AES_BLOCK_SIZE
typedef struct prov_aes_ocb_ctx_st {
PROV_CIPHER_CTX base; /* Must be first */
union {
OSSL_UNION_ALIGN;
AES_KEY ks;
} ksenc; /* AES key schedule to use for encryption/aad */
union {
OSSL_UNION_ALIGN;
AES_KEY ks;
} ksdec; /* AES key schedule to use for decryption */
OCB128_CONTEXT ocb;
unsigned int iv_state; /* set to one of IV_STATE_XXX */
unsigned int key_set : 1;
size_t taglen;
size_t data_buf_len;
size_t aad_buf_len;
unsigned char tag[OCB_MAX_TAG_LEN];
unsigned char data_buf[OCB_MAX_DATA_LEN]; /* Store partial data blocks */
unsigned char aad_buf[OCB_MAX_AAD_LEN]; /* Store partial AAD blocks */
} PROV_AES_OCB_CTX;
const PROV_CIPHER_HW *PROV_CIPHER_HW_aes_ocb(size_t keybits);
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