providers/implementations/ciphers/cipher_aes_ocb.h

   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
  17 typedef 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
  38 const PROV_CIPHER_HW *PROV_CIPHER_HW_aes_ocb(size_t keybits);