2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include <openssl/crypto.h>
12 #include <openssl/core_dispatch.h>
13 #include <openssl/proverr.h>
14 #include "prov/implementations.h"
15 #include "prov/ciphercommon.h"
16 #include "prov/providercommon.h"
18 typedef struct prov_cipher_null_ctx_st {
21 const unsigned char *tlsmac;
22 } PROV_CIPHER_NULL_CTX;
24 static OSSL_FUNC_cipher_newctx_fn null_newctx;
25 static void *null_newctx(void *provctx)
27 if (!ossl_prov_is_running())
30 return OPENSSL_zalloc(sizeof(PROV_CIPHER_NULL_CTX));
33 static OSSL_FUNC_cipher_freectx_fn null_freectx;
34 static void null_freectx(void *vctx)
39 static OSSL_FUNC_cipher_encrypt_init_fn null_einit;
40 static int null_einit(void *vctx, const unsigned char *key, size_t keylen,
41 const unsigned char *iv, size_t ivlen)
43 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
45 if (!ossl_prov_is_running())
52 static OSSL_FUNC_cipher_decrypt_init_fn null_dinit;
53 static int null_dinit(void *vctx, const unsigned char *key, size_t keylen,
54 const unsigned char *iv, size_t ivlen)
56 if (!ossl_prov_is_running())
62 static OSSL_FUNC_cipher_cipher_fn null_cipher;
63 static int null_cipher(void *vctx, unsigned char *out, size_t *outl,
64 size_t outsize, const unsigned char *in, size_t inl)
66 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
68 if (!ossl_prov_is_running())
71 if (!ctx->enc && ctx->tlsmacsize > 0) {
73 * TLS NULL cipher as per:
74 * https://tools.ietf.org/html/rfc5246#section-6.2.3.1
76 if (inl < ctx->tlsmacsize)
78 ctx->tlsmac = in + inl - ctx->tlsmacsize;
79 inl -= ctx->tlsmacsize;
89 static OSSL_FUNC_cipher_final_fn null_final;
90 static int null_final(void *vctx, unsigned char *out, size_t *outl,
93 if (!ossl_prov_is_running())
100 static OSSL_FUNC_cipher_get_params_fn null_get_params;
101 static int null_get_params(OSSL_PARAM params[])
103 return ossl_cipher_generic_get_params(params, 0, 0, 0, 8, 0);
106 static const OSSL_PARAM null_known_gettable_ctx_params[] = {
107 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
108 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
109 { OSSL_CIPHER_PARAM_TLS_MAC, OSSL_PARAM_OCTET_PTR, NULL, 0, OSSL_PARAM_UNMODIFIED },
113 static OSSL_FUNC_cipher_gettable_ctx_params_fn null_gettable_ctx_params;
114 static const OSSL_PARAM *null_gettable_ctx_params(ossl_unused void *cctx,
115 ossl_unused void *provctx)
117 return null_known_gettable_ctx_params;
120 static OSSL_FUNC_cipher_get_ctx_params_fn null_get_ctx_params;
121 static int null_get_ctx_params(void *vctx, OSSL_PARAM params[])
123 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
126 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
127 if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) {
128 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
131 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
132 if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) {
133 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
136 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS_MAC);
138 && !OSSL_PARAM_set_octet_ptr(p, ctx->tlsmac, ctx->tlsmacsize)) {
139 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
145 static const OSSL_PARAM null_known_settable_ctx_params[] = {
146 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS_MAC_SIZE, NULL),
150 static OSSL_FUNC_cipher_settable_ctx_params_fn null_settable_ctx_params;
151 static const OSSL_PARAM *null_settable_ctx_params(ossl_unused void *cctx,
152 ossl_unused void *provctx)
154 return null_known_settable_ctx_params;
158 static OSSL_FUNC_cipher_set_ctx_params_fn null_set_ctx_params;
159 static int null_set_ctx_params(void *vctx, const OSSL_PARAM params[])
161 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
164 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_TLS_MAC_SIZE);
166 if (!OSSL_PARAM_get_size_t(p, &ctx->tlsmacsize)) {
167 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
175 const OSSL_DISPATCH ossl_null_functions[] = {
176 { OSSL_FUNC_CIPHER_NEWCTX,
177 (void (*)(void)) null_newctx },
178 { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) null_freectx },
179 { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) null_newctx },
180 { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))null_einit },
181 { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))null_dinit },
182 { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))null_cipher },
183 { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))null_final },
184 { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))null_cipher },
185 { OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void)) null_get_params },
186 { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,
187 (void (*)(void))ossl_cipher_generic_gettable_params },
188 { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))null_get_ctx_params },
189 { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
190 (void (*)(void))null_gettable_ctx_params },
191 { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))null_set_ctx_params },
192 { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
193 (void (*)(void))null_settable_ctx_params },