2 * Copyright 2018-2021 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
12 #include <openssl/evp.h>
13 #include <openssl/err.h>
14 #include <openssl/core.h>
15 #include <openssl/core_names.h>
16 #include <openssl/types.h>
17 #include "internal/nelem.h"
18 #include "crypto/evp.h"
19 #include "internal/provider.h"
20 #include "evp_local.h"
22 EVP_MAC_CTX *EVP_MAC_CTX_new(EVP_MAC *mac)
24 EVP_MAC_CTX *ctx = OPENSSL_zalloc(sizeof(EVP_MAC_CTX));
27 || (ctx->algctx = mac->newctx(ossl_provider_ctx(mac->prov))) == NULL
28 || !EVP_MAC_up_ref(mac)) {
29 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
31 mac->freectx(ctx->algctx);
40 void EVP_MAC_CTX_free(EVP_MAC_CTX *ctx)
44 ctx->meth->freectx(ctx->algctx);
47 EVP_MAC_free(ctx->meth);
51 EVP_MAC_CTX *EVP_MAC_CTX_dup(const EVP_MAC_CTX *src)
55 if (src->algctx == NULL)
58 dst = OPENSSL_malloc(sizeof(*dst));
60 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
65 if (!EVP_MAC_up_ref(dst->meth)) {
66 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
71 dst->algctx = src->meth->dupctx(src->algctx);
72 if (dst->algctx == NULL) {
73 EVP_MAC_CTX_free(dst);
80 EVP_MAC *EVP_MAC_CTX_get0_mac(EVP_MAC_CTX *ctx)
85 static size_t get_size_t_ctx_param(EVP_MAC_CTX *ctx, const char *name)
89 if (ctx->algctx != NULL) {
90 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
92 params[0] = OSSL_PARAM_construct_size_t(name, &sz);
93 if (ctx->meth->get_ctx_params != NULL) {
94 if (ctx->meth->get_ctx_params(ctx->algctx, params))
96 } else if (ctx->meth->get_params != NULL) {
97 if (ctx->meth->get_params(params))
102 * If the MAC hasn't been initialized yet, or there is no size to get,
108 size_t EVP_MAC_CTX_get_mac_size(EVP_MAC_CTX *ctx)
110 return get_size_t_ctx_param(ctx, OSSL_MAC_PARAM_SIZE);
113 size_t EVP_MAC_CTX_get_block_size(EVP_MAC_CTX *ctx)
115 return get_size_t_ctx_param(ctx, OSSL_MAC_PARAM_BLOCK_SIZE);
118 int EVP_MAC_init(EVP_MAC_CTX *ctx, const unsigned char *key, size_t keylen,
119 const OSSL_PARAM params[])
121 return ctx->meth->init(ctx->algctx, key, keylen, params);
124 int EVP_MAC_update(EVP_MAC_CTX *ctx, const unsigned char *data, size_t datalen)
126 return ctx->meth->update(ctx->algctx, data, datalen);
129 static int evp_mac_final(EVP_MAC_CTX *ctx, int xof,
130 unsigned char *out, size_t *outl, size_t outsize)
134 OSSL_PARAM params[2];
136 if (ctx == NULL || ctx->meth == NULL) {
137 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
140 if (ctx->meth->final == NULL) {
141 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
147 ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
150 *outl = EVP_MAC_CTX_get_mac_size(ctx);
154 params[0] = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_XOF, &xof);
155 params[1] = OSSL_PARAM_construct_end();
157 if (EVP_MAC_CTX_set_params(ctx, params) <= 0) {
158 ERR_raise(ERR_LIB_EVP, EVP_R_SETTING_XOF_FAILED);
162 res = ctx->meth->final(ctx->algctx, out, &l, outsize);
168 int EVP_MAC_final(EVP_MAC_CTX *ctx,
169 unsigned char *out, size_t *outl, size_t outsize)
171 return evp_mac_final(ctx, 0, out, outl, outsize);
174 int EVP_MAC_finalXOF(EVP_MAC_CTX *ctx, unsigned char *out, size_t outsize)
176 return evp_mac_final(ctx, 1, out, NULL, outsize);
180 * The {get,set}_params functions return 1 if there is no corresponding
181 * function in the implementation. This is the same as if there was one,
182 * but it didn't recognise any of the given params, i.e. nothing in the
183 * bag of parameters was useful.
185 int EVP_MAC_get_params(EVP_MAC *mac, OSSL_PARAM params[])
187 if (mac->get_params != NULL)
188 return mac->get_params(params);
192 int EVP_MAC_CTX_get_params(EVP_MAC_CTX *ctx, OSSL_PARAM params[])
194 if (ctx->meth->get_ctx_params != NULL)
195 return ctx->meth->get_ctx_params(ctx->algctx, params);
199 int EVP_MAC_CTX_set_params(EVP_MAC_CTX *ctx, const OSSL_PARAM params[])
201 if (ctx->meth->set_ctx_params != NULL)
202 return ctx->meth->set_ctx_params(ctx->algctx, params);
206 int evp_mac_get_number(const EVP_MAC *mac)
211 const char *EVP_MAC_get0_name(const EVP_MAC *mac)
213 return mac->type_name;
216 const char *EVP_MAC_get0_description(const EVP_MAC *mac)
218 return mac->description;
221 int EVP_MAC_is_a(const EVP_MAC *mac, const char *name)
223 return evp_is_a(mac->prov, mac->name_id, NULL, name);
226 int EVP_MAC_names_do_all(const EVP_MAC *mac,
227 void (*fn)(const char *name, void *data),
230 if (mac->prov != NULL)
231 return evp_names_do_all(mac->prov, mac->name_id, fn, data);
236 unsigned char *EVP_Q_mac(OSSL_LIB_CTX *libctx,
237 const char *name, const char *propq,
238 const char *subalg, const OSSL_PARAM *params,
239 const void *key, size_t keylen,
240 const unsigned char *data, size_t datalen,
241 unsigned char *out, size_t outsize, size_t *outlen)
243 EVP_MAC *mac = EVP_MAC_fetch(libctx, name, propq);
244 OSSL_PARAM subalg_param[] = { OSSL_PARAM_END, OSSL_PARAM_END };
245 EVP_MAC_CTX *ctx = NULL;
247 unsigned char *res = NULL;
253 if (subalg != NULL) {
254 const OSSL_PARAM *defined_params = EVP_MAC_settable_ctx_params(mac);
255 const char *param_name = OSSL_MAC_PARAM_DIGEST;
258 * The underlying algorithm may be a cipher or a digest.
259 * We don't know which it is, but we can ask the MAC what it
260 * should be and bet on that.
262 if (OSSL_PARAM_locate_const(defined_params, param_name) == NULL) {
263 param_name = OSSL_MAC_PARAM_CIPHER;
264 if (OSSL_PARAM_locate_const(defined_params, param_name) == NULL) {
265 ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_INVALID_ARGUMENT);
270 OSSL_PARAM_construct_utf8_string(param_name, (char *)subalg, 0);
272 /* Single-shot - on NULL key input, set dummy key value for EVP_MAC_Init. */
273 if (key == NULL && keylen == 0)
275 if ((ctx = EVP_MAC_CTX_new(mac)) != NULL
276 && EVP_MAC_CTX_set_params(ctx, subalg_param)
277 && EVP_MAC_CTX_set_params(ctx, params)
278 && EVP_MAC_init(ctx, key, keylen, params)
279 && EVP_MAC_update(ctx, data, datalen)
280 && EVP_MAC_final(ctx, out, &len, outsize)) {
282 out = OPENSSL_malloc(len);
283 if (out != NULL && !EVP_MAC_final(ctx, out, NULL, len)) {
289 if (res != NULL && outlen != NULL)
294 EVP_MAC_CTX_free(ctx);