providers/implementations/ciphers/cipher_aes_cts.inc

   1 /*
   2  * Copyright 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 /* Dispatch functions for AES CBC CTS ciphers */
  11
  12 #include "cipher_aes_cts.h"
  13 #include "prov/providercommonerr.h"
  14
  15 static OSSL_FUNC_cipher_get_ctx_params_fn aes_cbc_cts_get_ctx_params;
  16 static OSSL_FUNC_cipher_set_ctx_params_fn aes_cbc_cts_set_ctx_params;
  17 static OSSL_FUNC_cipher_gettable_ctx_params_fn aes_cbc_cts_gettable_ctx_params;
  18 static OSSL_FUNC_cipher_settable_ctx_params_fn aes_cbc_cts_settable_ctx_params;
  19
  20 CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(aes_cbc_cts)
  21 OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0),
  22 CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(aes_cbc_cts)
  23
  24 static int aes_cbc_cts_get_ctx_params(void *vctx, OSSL_PARAM params[])
  25 {
  26     PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
  27     OSSL_PARAM *p;
  28
  29     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_CTS_MODE);
  30     if (p != NULL) {
  31         const char *name = aes_cbc_cts_mode_id2name(ctx->cts_mode);
  32
  33         if (name == NULL || !OSSL_PARAM_set_utf8_string(p, name)) {
  34             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
  35             return 0;
  36         }
  37     }
  38     return cipher_generic_get_ctx_params(vctx, params);
  39 }
  40
  41 CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(aes_cbc_cts)
  42 OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0),
  43 CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(aes_cbc_cts)
  44
  45 static int aes_cbc_cts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
  46 {
  47     PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
  48     const OSSL_PARAM *p;
  49     int id;
  50
  51     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_CTS_MODE);
  52     if (p != NULL) {
  53         if (p->data_type != OSSL_PARAM_UTF8_STRING)
  54             goto err;
  55         id = aes_cbc_cts_mode_name2id(p->data);
  56         if (id < 0)
  57             goto err;
  58
  59         ctx->cts_mode = (unsigned int)id;
  60     }
  61     return cipher_generic_set_ctx_params(vctx, params);
  62 err:
  63     ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
  64     return 0;
  65 }
  66
  67 /* NOTE: The underlying block cipher is AES CBC so we reuse most of the code */
  68 #define IMPLEMENT_cts_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits,         \
  69                              blkbits, ivbits, typ)                             \
  70 static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params;   \
  71 static int alg##_cts_##kbits##_##lcmode##_get_params(OSSL_PARAM params[])      \
  72 {                                                                              \
  73     return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, flags,  \
  74                                      kbits, blkbits, ivbits);                  \
  75 }                                                                              \
  76 const OSSL_DISPATCH alg##kbits##lcmode##_cts_functions[] = {                   \
  77     { OSSL_FUNC_CIPHER_NEWCTX,                                                 \
  78       (void (*)(void)) alg##_##kbits##_##lcmode##_newctx },                    \
  79     { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx },              \
  80     { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx },                \
  81     { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))cipher_generic_einit },   \
  82     { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))cipher_generic_dinit },   \
  83     { OSSL_FUNC_CIPHER_UPDATE,                                                 \
  84       (void (*)(void)) alg##_##lcmode##_cts_block_update },                    \
  85     { OSSL_FUNC_CIPHER_FINAL,                                                  \
  86       (void (*)(void)) alg##_##lcmode##_cts_block_final },                     \
  87     { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))cipher_generic_cipher },        \
  88     { OSSL_FUNC_CIPHER_GET_PARAMS,                                             \
  89       (void (*)(void)) alg##_cts_##kbits##_##lcmode##_get_params },            \
  90     { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                        \
  91       (void (*)(void))cipher_generic_gettable_params },                        \
  92     { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                         \
  93       (void (*)(void))aes_cbc_cts_get_ctx_params },                            \
  94     { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                         \
  95       (void (*)(void))aes_cbc_cts_set_ctx_params },                            \
  96     { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
  97       (void (*)(void))aes_cbc_cts_gettable_ctx_params },                       \
  98     { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                    \
  99      (void (*)(void))aes_cbc_cts_settable_ctx_params },                        \
 100     { 0, NULL }                                                                \
 101 };
 102
 103 /* aes256cbc_cts_functions */
 104 IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, EVP_CIPH_FLAG_CTS, 256, 128, 128, block)
 105 /* aes192cbc_cts_functions */
 106 IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, EVP_CIPH_FLAG_CTS, 192, 128, 128, block)
 107 /* aes128cbc_cts_functions */
 108 IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, EVP_CIPH_FLAG_CTS, 128, 128, 128, block)