providers/implementations/ciphers/cipher_aes_ocb.c

   1 /*
   2  * Copyright 2019-2021 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 /*
  11  * AES low level APIs are deprecated for public use, but still ok for internal
  12  * use where we're using them to implement the higher level EVP interface, as is
  13  * the case here.
  14  */
  15 #include "internal/deprecated.h"
  16
  17 #include <openssl/proverr.h>
  18 #include "cipher_aes_ocb.h"
  19 #include "prov/providercommon.h"
  20 #include "prov/ciphercommon_aead.h"
  21 #include "prov/implementations.h"
  22
  23 #define AES_OCB_FLAGS AEAD_FLAGS
  24
  25 #define OCB_DEFAULT_TAG_LEN 16
  26 #define OCB_DEFAULT_IV_LEN  12
  27 #define OCB_MIN_IV_LEN      1
  28 #define OCB_MAX_IV_LEN      15
  29
  30 PROV_CIPHER_FUNC(int, ocb_cipher, (PROV_AES_OCB_CTX *ctx,
  31                                    const unsigned char *in, unsigned char *out,
  32                                    size_t nextblock));
  33 /* forward declarations */
  34 static OSSL_FUNC_cipher_encrypt_init_fn aes_ocb_einit;
  35 static OSSL_FUNC_cipher_decrypt_init_fn aes_ocb_dinit;
  36 static OSSL_FUNC_cipher_update_fn aes_ocb_block_update;
  37 static OSSL_FUNC_cipher_final_fn aes_ocb_block_final;
  38 static OSSL_FUNC_cipher_cipher_fn aes_ocb_cipher;
  39 static OSSL_FUNC_cipher_freectx_fn aes_ocb_freectx;
  40 static OSSL_FUNC_cipher_dupctx_fn aes_ocb_dupctx;
  41 static OSSL_FUNC_cipher_get_ctx_params_fn aes_ocb_get_ctx_params;
  42 static OSSL_FUNC_cipher_set_ctx_params_fn aes_ocb_set_ctx_params;
  43 static OSSL_FUNC_cipher_gettable_ctx_params_fn cipher_ocb_gettable_ctx_params;
  44 static OSSL_FUNC_cipher_settable_ctx_params_fn cipher_ocb_settable_ctx_params;
  45
  46 /*
  47  * The following methods could be moved into PROV_AES_OCB_HW if
  48  * multiple hardware implementations are ever needed.
  49  */
  50 static ossl_inline int aes_generic_ocb_setiv(PROV_AES_OCB_CTX *ctx,
  51                                              const unsigned char *iv,
  52                                              size_t ivlen, size_t taglen)
  53 {
  54     return (CRYPTO_ocb128_setiv(&ctx->ocb, iv, ivlen, taglen) == 1);
  55 }
  56
  57 static ossl_inline int aes_generic_ocb_setaad(PROV_AES_OCB_CTX *ctx,
  58                                               const unsigned char *aad,
  59                                               size_t alen)
  60 {
  61     return CRYPTO_ocb128_aad(&ctx->ocb, aad, alen) == 1;
  62 }
  63
  64 static ossl_inline int aes_generic_ocb_gettag(PROV_AES_OCB_CTX *ctx,
  65                                               unsigned char *tag, size_t tlen)
  66 {
  67     return CRYPTO_ocb128_tag(&ctx->ocb, tag, tlen) > 0;
  68 }
  69
  70 static ossl_inline int aes_generic_ocb_final(PROV_AES_OCB_CTX *ctx)
  71 {
  72     return (CRYPTO_ocb128_finish(&ctx->ocb, ctx->tag, ctx->taglen) == 0);
  73 }
  74
  75 static ossl_inline void aes_generic_ocb_cleanup(PROV_AES_OCB_CTX *ctx)
  76 {
  77     CRYPTO_ocb128_cleanup(&ctx->ocb);
  78 }
  79
  80 static ossl_inline int aes_generic_ocb_cipher(PROV_AES_OCB_CTX *ctx,
  81                                               const unsigned char *in,
  82                                               unsigned char *out, size_t len)
  83 {
  84     if (ctx->base.enc) {
  85         if (!CRYPTO_ocb128_encrypt(&ctx->ocb, in, out, len))
  86             return 0;
  87     } else {
  88         if (!CRYPTO_ocb128_decrypt(&ctx->ocb, in, out, len))
  89             return 0;
  90     }
  91     return 1;
  92 }
  93
  94 static ossl_inline int aes_generic_ocb_copy_ctx(PROV_AES_OCB_CTX *dst,
  95                                                 PROV_AES_OCB_CTX *src)
  96 {
  97     return CRYPTO_ocb128_copy_ctx(&dst->ocb, &src->ocb,
  98                                   &dst->ksenc.ks, &dst->ksdec.ks);
  99 }
 100
 101 /*-
 102  * Provider dispatch functions
 103  */
 104 static int aes_ocb_init(void *vctx, const unsigned char *key, size_t keylen,
 105                         const unsigned char *iv, size_t ivlen, int enc)
 106 {
 107     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 108
 109     if (!ossl_prov_is_running())
 110         return 0;
 111
 112     ctx->aad_buf_len = 0;
 113     ctx->data_buf_len = 0;
 114     ctx->base.enc = enc;
 115
 116     if (iv != NULL) {
 117         if (ivlen != ctx->base.ivlen) {
 118             /* IV len must be 1 to 15 */
 119             if (ivlen < OCB_MIN_IV_LEN || ivlen > OCB_MAX_IV_LEN) {
 120                 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
 121                 return 0;
 122             }
 123             ctx->base.ivlen = ivlen;
 124         }
 125         if (!ossl_cipher_generic_initiv(&ctx->base, iv, ivlen))
 126             return 0;
 127         ctx->iv_state = IV_STATE_BUFFERED;
 128     }
 129     if (key != NULL) {
 130         if (keylen != ctx->base.keylen) {
 131             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
 132             return 0;
 133         }
 134         return ctx->base.hw->init(&ctx->base, key, keylen);
 135     }
 136     return 1;
 137 }
 138
 139 static int aes_ocb_einit(void *vctx, const unsigned char *key, size_t keylen,
 140                          const unsigned char *iv, size_t ivlen)
 141 {
 142     return aes_ocb_init(vctx, key, keylen, iv, ivlen, 1);
 143 }
 144
 145 static int aes_ocb_dinit(void *vctx, const unsigned char *key, size_t keylen,
 146                          const unsigned char *iv, size_t ivlen)
 147 {
 148     return aes_ocb_init(vctx, key, keylen, iv, ivlen, 0);
 149 }
 150
 151 /*
 152  * Because of the way OCB works, both the AAD and data are buffered in the
 153  * same way. Only the last block can be a partial block.
 154  */
 155 static int aes_ocb_block_update_internal(PROV_AES_OCB_CTX *ctx,
 156                                          unsigned char *buf, size_t *bufsz,
 157                                          unsigned char *out, size_t *outl,
 158                                          size_t outsize, const unsigned char *in,
 159                                          size_t inl, OSSL_ocb_cipher_fn ciph)
 160 {
 161     size_t nextblocks;
 162     size_t outlint = 0;
 163
 164     if (*bufsz != 0)
 165         nextblocks = fillblock(buf, bufsz, AES_BLOCK_SIZE, &in, &inl);
 166     else
 167         nextblocks = inl & ~(AES_BLOCK_SIZE-1);
 168
 169     if (*bufsz == AES_BLOCK_SIZE) {
 170         if (outsize < AES_BLOCK_SIZE) {
 171             ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
 172             return 0;
 173         }
 174         if (!ciph(ctx, buf, out, AES_BLOCK_SIZE)) {
 175             ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
 176             return 0;
 177         }
 178         *bufsz = 0;
 179         outlint = AES_BLOCK_SIZE;
 180         if (out != NULL)
 181             out += AES_BLOCK_SIZE;
 182     }
 183     if (nextblocks > 0) {
 184         outlint += nextblocks;
 185         if (outsize < outlint) {
 186             ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
 187             return 0;
 188         }
 189         if (!ciph(ctx, in, out, nextblocks)) {
 190             ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
 191             return 0;
 192         }
 193         in += nextblocks;
 194         inl -= nextblocks;
 195     }
 196     if (inl != 0 && !trailingdata(buf, bufsz, AES_BLOCK_SIZE, &in, &inl)) {
 197         /* PROVerr already called */
 198         return 0;
 199     }
 200
 201     *outl = outlint;
 202     return inl == 0;
 203 }
 204
 205 /* A wrapper function that has the same signature as cipher */
 206 static int cipher_updateaad(PROV_AES_OCB_CTX *ctx, const unsigned char *in,
 207                             unsigned char *out, size_t len)
 208 {
 209     return aes_generic_ocb_setaad(ctx, in, len);
 210 }
 211
 212 static int update_iv(PROV_AES_OCB_CTX *ctx)
 213 {
 214     if (ctx->iv_state == IV_STATE_FINISHED
 215         || ctx->iv_state == IV_STATE_UNINITIALISED)
 216         return 0;
 217     if (ctx->iv_state == IV_STATE_BUFFERED) {
 218         if (!aes_generic_ocb_setiv(ctx, ctx->base.iv, ctx->base.ivlen,
 219                                    ctx->taglen))
 220             return 0;
 221         ctx->iv_state = IV_STATE_COPIED;
 222     }
 223     return 1;
 224 }
 225
 226 static int aes_ocb_block_update(void *vctx, unsigned char *out, size_t *outl,
 227                                 size_t outsize, const unsigned char *in,
 228                                 size_t inl)
 229 {
 230     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 231     unsigned char *buf;
 232     size_t *buflen;
 233     OSSL_ocb_cipher_fn fn;
 234
 235     if (!ctx->key_set || !update_iv(ctx))
 236         return 0;
 237
 238     if (inl == 0) {
 239         *outl = 0;
 240         return 1;
 241     }
 242
 243     /* Are we dealing with AAD or normal data here? */
 244     if (out == NULL) {
 245         buf = ctx->aad_buf;
 246         buflen = &ctx->aad_buf_len;
 247         fn = cipher_updateaad;
 248     } else {
 249         buf = ctx->data_buf;
 250         buflen = &ctx->data_buf_len;
 251         fn = aes_generic_ocb_cipher;
 252     }
 253     return aes_ocb_block_update_internal(ctx, buf, buflen, out, outl, outsize,
 254                                          in, inl, fn);
 255 }
 256
 257 static int aes_ocb_block_final(void *vctx, unsigned char *out, size_t *outl,
 258                                size_t outsize)
 259 {
 260     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 261
 262     if (!ossl_prov_is_running())
 263         return 0;
 264
 265     /* If no block_update has run then the iv still needs to be set */
 266     if (!ctx->key_set || !update_iv(ctx))
 267         return 0;
 268
 269     /*
 270      * Empty the buffer of any partial block that we might have been provided,
 271      * both for data and AAD
 272      */
 273     *outl = 0;
 274     if (ctx->data_buf_len > 0) {
 275         if (!aes_generic_ocb_cipher(ctx, ctx->data_buf, out, ctx->data_buf_len))
 276             return 0;
 277         *outl = ctx->data_buf_len;
 278         ctx->data_buf_len = 0;
 279     }
 280     if (ctx->aad_buf_len > 0) {
 281         if (!aes_generic_ocb_setaad(ctx, ctx->aad_buf, ctx->aad_buf_len))
 282             return 0;
 283         ctx->aad_buf_len = 0;
 284     }
 285     if (ctx->base.enc) {
 286         /* If encrypting then just get the tag */
 287         if (!aes_generic_ocb_gettag(ctx, ctx->tag, ctx->taglen))
 288             return 0;
 289     } else {
 290         /* If decrypting then verify */
 291         if (ctx->taglen == 0)
 292             return 0;
 293         if (!aes_generic_ocb_final(ctx))
 294             return 0;
 295     }
 296     /* Don't reuse the IV */
 297     ctx->iv_state = IV_STATE_FINISHED;
 298     return 1;
 299 }
 300
 301 static void *aes_ocb_newctx(void *provctx, size_t kbits, size_t blkbits,
 302                             size_t ivbits, unsigned int mode, uint64_t flags)
 303 {
 304     PROV_AES_OCB_CTX *ctx;
 305
 306     if (!ossl_prov_is_running())
 307         return NULL;
 308
 309     ctx = OPENSSL_zalloc(sizeof(*ctx));
 310     if (ctx != NULL) {
 311         ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
 312                                     ossl_prov_cipher_hw_aes_ocb(kbits), NULL);
 313         ctx->taglen = OCB_DEFAULT_TAG_LEN;
 314     }
 315     return ctx;
 316 }
 317
 318 static void aes_ocb_freectx(void *vctx)
 319 {
 320     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 321
 322     if (ctx != NULL) {
 323         aes_generic_ocb_cleanup(ctx);
 324         ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
 325         OPENSSL_clear_free(ctx,  sizeof(*ctx));
 326     }
 327 }
 328
 329 static void *aes_ocb_dupctx(void *vctx)
 330 {
 331     PROV_AES_OCB_CTX *in = (PROV_AES_OCB_CTX *)vctx;
 332     PROV_AES_OCB_CTX *ret;
 333
 334     if (!ossl_prov_is_running())
 335         return NULL;
 336
 337     ret = OPENSSL_malloc(sizeof(*ret));
 338     if (ret == NULL) {
 339         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 340         return NULL;
 341     }
 342     *ret = *in;
 343     if (!aes_generic_ocb_copy_ctx(ret, in)) {
 344         OPENSSL_free(ret);
 345         ret = NULL;
 346     }
 347     return ret;
 348 }
 349
 350 static int aes_ocb_set_ctx_params(void *vctx, const OSSL_PARAM params[])
 351 {
 352     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 353     const OSSL_PARAM *p;
 354     size_t sz;
 355
 356     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG);
 357     if (p != NULL) {
 358         if (p->data_type != OSSL_PARAM_OCTET_STRING) {
 359             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 360             return 0;
 361         }
 362         if (p->data == NULL) {
 363             /* Tag len must be 0 to 16 */
 364             if (p->data_size > OCB_MAX_TAG_LEN)
 365                 return 0;
 366             ctx->taglen = p->data_size;
 367         } else {
 368             if (p->data_size != ctx->taglen || ctx->base.enc)
 369                 return 0;
 370             memcpy(ctx->tag, p->data, p->data_size);
 371         }
 372      }
 373     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_IVLEN);
 374     if (p != NULL) {
 375         if (!OSSL_PARAM_get_size_t(p, &sz)) {
 376             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 377             return 0;
 378         }
 379         /* IV len must be 1 to 15 */
 380         if (sz < OCB_MIN_IV_LEN || sz > OCB_MAX_IV_LEN)
 381             return 0;
 382         ctx->base.ivlen = sz;
 383     }
 384     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
 385     if (p != NULL) {
 386         size_t keylen;
 387
 388         if (!OSSL_PARAM_get_size_t(p, &keylen)) {
 389             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 390             return 0;
 391         }
 392         if (ctx->base.keylen != keylen) {
 393             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
 394             return 0;
 395         }
 396     }
 397     return 1;
 398 }
 399
 400 static int aes_ocb_get_ctx_params(void *vctx, OSSL_PARAM params[])
 401 {
 402     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 403     OSSL_PARAM *p;
 404
 405     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
 406     if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->base.ivlen)) {
 407         ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 408         return 0;
 409     }
 410     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
 411     if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->base.keylen)) {
 412         ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 413         return 0;
 414     }
 415     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN);
 416     if (p != NULL) {
 417         if (!OSSL_PARAM_set_size_t(p, ctx->taglen)) {
 418             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 419             return 0;
 420         }
 421     }
 422
 423     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV);
 424     if (p != NULL) {
 425         if (ctx->base.ivlen > p->data_size) {
 426             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
 427             return 0;
 428         }
 429         if (!OSSL_PARAM_set_octet_string(p, ctx->base.oiv, ctx->base.ivlen)
 430             && !OSSL_PARAM_set_octet_ptr(p, &ctx->base.oiv, ctx->base.ivlen)) {
 431             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 432             return 0;
 433         }
 434     }
 435     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_UPDATED_IV);
 436     if (p != NULL) {
 437         if (ctx->base.ivlen > p->data_size) {
 438             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
 439             return 0;
 440         }
 441         if (!OSSL_PARAM_set_octet_string(p, ctx->base.iv, ctx->base.ivlen)
 442             && !OSSL_PARAM_set_octet_ptr(p, &ctx->base.iv, ctx->base.ivlen)) {
 443             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 444             return 0;
 445         }
 446     }
 447     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG);
 448     if (p != NULL) {
 449         if (p->data_type != OSSL_PARAM_OCTET_STRING) {
 450             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 451             return 0;
 452         }
 453         if (!ctx->base.enc || p->data_size != ctx->taglen) {
 454             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
 455             return 0;
 456         }
 457         memcpy(p->data, ctx->tag, ctx->taglen);
 458     }
 459     return 1;
 460 }
 461
 462 static const OSSL_PARAM cipher_ocb_known_gettable_ctx_params[] = {
 463     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
 464     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
 465     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, NULL),
 466     OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_IV, NULL, 0),
 467     OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_UPDATED_IV, NULL, 0),
 468     OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
 469     OSSL_PARAM_END
 470 };
 471 static const OSSL_PARAM *cipher_ocb_gettable_ctx_params(ossl_unused void *p_ctx)
 472 {
 473     return cipher_ocb_known_gettable_ctx_params;
 474 }
 475
 476 static const OSSL_PARAM cipher_ocb_known_settable_ctx_params[] = {
 477     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
 478     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN, NULL),
 479     OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
 480     OSSL_PARAM_END
 481 };
 482 static const OSSL_PARAM *cipher_ocb_settable_ctx_params(ossl_unused void *p_ctx)
 483 {
 484     return cipher_ocb_known_settable_ctx_params;
 485 }
 486
 487 static int aes_ocb_cipher(void *vctx, unsigned char *out, size_t *outl,
 488                           size_t outsize, const unsigned char *in, size_t inl)
 489 {
 490     PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
 491
 492     if (!ossl_prov_is_running())
 493         return 0;
 494
 495     if (outsize < inl) {
 496         ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
 497         return 0;
 498     }
 499
 500     if (!aes_generic_ocb_cipher(ctx, in, out, inl)) {
 501         ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
 502         return 0;
 503     }
 504
 505     *outl = inl;
 506     return 1;
 507 }
 508
 509 #define IMPLEMENT_cipher(mode, UCMODE, flags, kbits, blkbits, ivbits)          \
 510 static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##mode##_get_params;       \
 511 static int aes_##kbits##_##mode##_get_params(OSSL_PARAM params[])              \
 512 {                                                                              \
 513     return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,    \
 514                                           flags, kbits, blkbits, ivbits);      \
 515 }                                                                              \
 516 static OSSL_FUNC_cipher_newctx_fn aes_##kbits##_##mode##_newctx;               \
 517 static void *aes_##kbits##_##mode##_newctx(void *provctx)                      \
 518 {                                                                              \
 519     return aes_##mode##_newctx(provctx, kbits, blkbits, ivbits,                \
 520                                EVP_CIPH_##UCMODE##_MODE, flags);               \
 521 }                                                                              \
 522 const OSSL_DISPATCH ossl_##aes##kbits##mode##_functions[] = {                  \
 523     { OSSL_FUNC_CIPHER_NEWCTX,                                                 \
 524         (void (*)(void))aes_##kbits##_##mode##_newctx },                       \
 525     { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_##mode##_einit },     \
 526     { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_##mode##_dinit },     \
 527     { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_##mode##_block_update },    \
 528     { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_block_final },      \
 529     { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_ocb_cipher },               \
 530     { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx },        \
 531     { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_##mode##_dupctx },          \
 532     { OSSL_FUNC_CIPHER_GET_PARAMS,                                             \
 533         (void (*)(void))aes_##kbits##_##mode##_get_params },                   \
 534     { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                         \
 535         (void (*)(void))aes_##mode##_get_ctx_params },                         \
 536     { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                         \
 537         (void (*)(void))aes_##mode##_set_ctx_params },                         \
 538     { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                        \
 539         (void (*)(void))ossl_cipher_generic_gettable_params },                 \
 540     { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
 541         (void (*)(void))cipher_ocb_gettable_ctx_params },                      \
 542     { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                    \
 543         (void (*)(void))cipher_ocb_settable_ctx_params },                      \
 544     { 0, NULL }                                                                \
 545 }
 546
 547 IMPLEMENT_cipher(ocb, OCB, AES_OCB_FLAGS, 256, 128, OCB_DEFAULT_IV_LEN * 8);
 548 IMPLEMENT_cipher(ocb, OCB, AES_OCB_FLAGS, 192, 128, OCB_DEFAULT_IV_LEN * 8);
 549 IMPLEMENT_cipher(ocb, OCB, AES_OCB_FLAGS, 128, 128, OCB_DEFAULT_IV_LEN * 8);