1/* 2 * Copyright 2020-2021 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/* Dispatch functions for AES CBC CTS ciphers */ 11 12#include <openssl/proverr.h> 13#include "cipher_cts.h" 14 15#define CTS_FLAGS PROV_CIPHER_FLAG_CTS 16 17static OSSL_FUNC_cipher_encrypt_init_fn aes_cbc_cts_einit; 18static OSSL_FUNC_cipher_decrypt_init_fn aes_cbc_cts_dinit; 19static OSSL_FUNC_cipher_get_ctx_params_fn aes_cbc_cts_get_ctx_params; 20static OSSL_FUNC_cipher_set_ctx_params_fn aes_cbc_cts_set_ctx_params; 21static OSSL_FUNC_cipher_gettable_ctx_params_fn aes_cbc_cts_gettable_ctx_params; 22static OSSL_FUNC_cipher_settable_ctx_params_fn aes_cbc_cts_settable_ctx_params; 23 24CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(aes_cbc_cts) 25OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0), 26CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(aes_cbc_cts) 27 28static int aes_cbc_cts_einit(void *ctx, const unsigned char *key, size_t keylen, 29 const unsigned char *iv, size_t ivlen, 30 const OSSL_PARAM params[]) 31{ 32 if (!ossl_cipher_generic_einit(ctx, key, keylen, iv, ivlen, NULL)) 33 return 0; 34 return aes_cbc_cts_set_ctx_params(ctx, params); 35} 36 37static int aes_cbc_cts_dinit(void *ctx, const unsigned char *key, size_t keylen, 38 const unsigned char *iv, size_t ivlen, 39 const OSSL_PARAM params[]) 40{ 41 if (!ossl_cipher_generic_dinit(ctx, key, keylen, iv, ivlen, NULL)) 42 return 0; 43 return aes_cbc_cts_set_ctx_params(ctx, params); 44} 45 46static int aes_cbc_cts_get_ctx_params(void *vctx, OSSL_PARAM params[]) 47{ 48 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; 49 OSSL_PARAM *p; 50 51 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_CTS_MODE); 52 if (p != NULL) { 53 const char *name = ossl_cipher_cbc_cts_mode_id2name(ctx->cts_mode); 54 55 if (name == NULL || !OSSL_PARAM_set_utf8_string(p, name)) { 56 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); 57 return 0; 58 } 59 } 60 return ossl_cipher_generic_get_ctx_params(vctx, params); 61} 62 63CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(aes_cbc_cts) 64OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0), 65CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(aes_cbc_cts) 66 67static int aes_cbc_cts_set_ctx_params(void *vctx, const OSSL_PARAM params[]) 68{ 69 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; 70 const OSSL_PARAM *p; 71 int id; 72 73 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_CTS_MODE); 74 if (p != NULL) { 75 if (p->data_type != OSSL_PARAM_UTF8_STRING) 76 goto err; 77 id = ossl_cipher_cbc_cts_mode_name2id(p->data); 78 if (id < 0) 79 goto err; 80 81 ctx->cts_mode = (unsigned int)id; 82 } 83 return ossl_cipher_generic_set_ctx_params(vctx, params); 84err: 85 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); 86 return 0; 87} 88 89/* ossl_aes256cbc_cts_functions */ 90IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 256, 128, 128, block) 91/* ossl_aes192cbc_cts_functions */ 92IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 192, 128, 128, block) 93/* ossl_aes128cbc_cts_functions */ 94IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 128, 128, 128, block) 95