2 * Copyright 2020 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 "prov/implementations.h"
14 #include "prov/ciphercommon.h"
15 #include "prov/providercommonerr.h"
17 typedef struct prov_cipher_null_ctx_st {
20 const unsigned char *tlsmac;
21 } PROV_CIPHER_NULL_CTX;
23 static OSSL_FUNC_cipher_newctx_fn null_newctx;
24 static void *null_newctx(void *provctx)
26 return OPENSSL_zalloc(sizeof(PROV_CIPHER_NULL_CTX));
29 static OSSL_FUNC_cipher_freectx_fn null_freectx;
30 static void null_freectx(void *vctx)
35 static OSSL_FUNC_cipher_encrypt_init_fn null_einit;
36 static int null_einit(void *vctx, const unsigned char *key, size_t keylen,
37 const unsigned char *iv, size_t ivlen)
39 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
45 static OSSL_FUNC_cipher_decrypt_init_fn null_dinit;
46 static int null_dinit(void *vctx, const unsigned char *key, size_t keylen,
47 const unsigned char *iv, size_t ivlen)
52 static OSSL_FUNC_cipher_cipher_fn null_cipher;
53 static int null_cipher(void *vctx, unsigned char *out, size_t *outl,
54 size_t outsize, const unsigned char *in, size_t inl)
56 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
58 if (!ctx->enc && ctx->tlsmacsize > 0) {
60 * TLS NULL cipher as per:
61 * https://tools.ietf.org/html/rfc5246#section-6.2.3.1
63 if (inl < ctx->tlsmacsize)
65 ctx->tlsmac = in + inl - ctx->tlsmacsize;
66 inl -= ctx->tlsmacsize;
76 static OSSL_FUNC_cipher_final_fn null_final;
77 static int null_final(void *vctx, unsigned char *out, size_t *outl,
84 static OSSL_FUNC_cipher_get_params_fn null_get_params;
85 static int null_get_params(OSSL_PARAM params[])
87 return cipher_generic_get_params(params, 0, 0, 0, 8, 0);
90 static const OSSL_PARAM null_known_gettable_ctx_params[] = {
91 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
92 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
93 { OSSL_CIPHER_PARAM_TLS_MAC, OSSL_PARAM_OCTET_PTR, NULL, 0, OSSL_PARAM_UNMODIFIED },
97 static OSSL_FUNC_cipher_gettable_ctx_params_fn null_gettable_ctx_params;
98 static const OSSL_PARAM *null_gettable_ctx_params(void)
100 return null_known_gettable_ctx_params;
103 static OSSL_FUNC_cipher_get_ctx_params_fn null_get_ctx_params;
104 static int null_get_ctx_params(void *vctx, OSSL_PARAM params[])
106 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
109 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
110 if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) {
111 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
114 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
115 if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) {
116 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
119 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS_MAC);
121 && !OSSL_PARAM_set_octet_ptr(p, ctx->tlsmac, ctx->tlsmacsize)) {
122 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
128 static const OSSL_PARAM null_known_settable_ctx_params[] = {
129 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS_MAC_SIZE, NULL),
133 static OSSL_FUNC_cipher_settable_ctx_params_fn null_settable_ctx_params;
134 static const OSSL_PARAM *null_settable_ctx_params(void)
136 return null_known_settable_ctx_params;
140 static OSSL_FUNC_cipher_set_ctx_params_fn null_set_ctx_params;
141 static int null_set_ctx_params(void *vctx, const OSSL_PARAM params[])
143 PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx;
146 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_TLS_MAC_SIZE);
148 if (!OSSL_PARAM_get_size_t(p, &ctx->tlsmacsize)) {
149 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
157 const OSSL_DISPATCH null_functions[] = {
158 { OSSL_FUNC_CIPHER_NEWCTX,
159 (void (*)(void)) null_newctx },
160 { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) null_freectx },
161 { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) null_newctx },
162 { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))null_einit },
163 { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))null_dinit },
164 { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))null_cipher },
165 { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))null_final },
166 { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))null_cipher },
167 { OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void)) null_get_params },
168 { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,
169 (void (*)(void))cipher_generic_gettable_params },
170 { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))null_get_ctx_params },
171 { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
172 (void (*)(void))null_gettable_ctx_params },
173 { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))null_set_ctx_params },
174 { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
175 (void (*)(void))null_settable_ctx_params },