2 * Copyright 2018 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
10 #include <openssl/core_numbers.h>
11 #include <openssl/core_names.h>
12 #include <openssl/params.h>
13 #include <openssl/engine.h>
14 #include <openssl/evp.h>
15 #include <openssl/hmac.h>
17 #include "internal/provider_algs.h"
18 #include "internal/provider_ctx.h"
21 * Forward declaration of everything implemented here. This is not strictly
22 * necessary for the compiler, but provides an assurance that the signatures
23 * of the functions in the dispatch table are correct.
25 static OSSL_OP_mac_newctx_fn hmac_new;
26 static OSSL_OP_mac_dupctx_fn hmac_dup;
27 static OSSL_OP_mac_freectx_fn hmac_free;
28 static OSSL_OP_mac_gettable_ctx_params_fn hmac_gettable_ctx_params;
29 static OSSL_OP_mac_get_ctx_params_fn hmac_get_ctx_params;
30 static OSSL_OP_mac_settable_ctx_params_fn hmac_settable_ctx_params;
31 static OSSL_OP_mac_set_ctx_params_fn hmac_set_ctx_params;
32 static OSSL_OP_mac_init_fn hmac_init;
33 static OSSL_OP_mac_update_fn hmac_update;
34 static OSSL_OP_mac_final_fn hmac_final;
36 /* local HMAC context structure */
38 /* typedef EVP_MAC_IMPL */
41 HMAC_CTX *ctx; /* HMAC context */
44 * References to the underlying digest implementation. tmpmd caches
45 * the md, always. alloc_md only holds a reference to an explicitly
47 * tmpmd is cleared after a CMAC_Init call.
49 const EVP_MD *tmpmd; /* HMAC digest */
50 EVP_MD *alloc_md; /* fetched digest */
53 * Conditions for legacy EVP_MD uses.
54 * tmpengine is cleared after a CMAC_Init call.
56 ENGINE *tmpengine; /* HMAC digest engine */
59 static size_t hmac_size(void *vmacctx);
61 static void *hmac_new(void *provctx)
63 struct hmac_data_st *macctx;
65 if ((macctx = OPENSSL_zalloc(sizeof(*macctx))) == NULL
66 || (macctx->ctx = HMAC_CTX_new()) == NULL) {
70 /* TODO(3.0) Should we do something more with that context? */
71 macctx->provctx = provctx;
76 static void hmac_free(void *vmacctx)
78 struct hmac_data_st *macctx = vmacctx;
81 HMAC_CTX_free(macctx->ctx);
82 EVP_MD_meth_free(macctx->alloc_md);
87 static void *hmac_dup(void *vsrc)
89 struct hmac_data_st *src = vsrc;
90 struct hmac_data_st *dst = hmac_new(src->provctx);
95 if (!HMAC_CTX_copy(dst->ctx, src->ctx)) {
100 if (src->alloc_md != NULL && !EVP_MD_up_ref(src->alloc_md)) {
105 dst->tmpengine = src->tmpengine;
106 dst->tmpmd = src->tmpmd;
107 dst->alloc_md = src->alloc_md;
111 static size_t hmac_size(void *vmacctx)
113 struct hmac_data_st *macctx = vmacctx;
115 return HMAC_size(macctx->ctx);
118 static int hmac_init(void *vmacctx)
120 struct hmac_data_st *macctx = vmacctx;
123 /* HMAC_Init_ex doesn't tolerate all zero params, so we must be careful */
124 if (macctx->tmpmd != NULL)
125 rv = HMAC_Init_ex(macctx->ctx, NULL, 0, macctx->tmpmd,
126 (ENGINE * )macctx->tmpengine);
127 macctx->tmpengine = NULL;
128 macctx->tmpmd = NULL;
132 static int hmac_update(void *vmacctx, const unsigned char *data,
135 struct hmac_data_st *macctx = vmacctx;
137 return HMAC_Update(macctx->ctx, data, datalen);
140 static int hmac_final(void *vmacctx, unsigned char *out, size_t *outl,
144 struct hmac_data_st *macctx = vmacctx;
146 if (!HMAC_Final(macctx->ctx, out, &hlen))
153 static const OSSL_PARAM known_gettable_ctx_params[] = {
154 OSSL_PARAM_size_t(OSSL_MAC_PARAM_OUTLEN, NULL),
155 OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL), /* Same as "outlen" */
158 static const OSSL_PARAM *hmac_gettable_ctx_params(void)
160 return known_gettable_ctx_params;
163 static int hmac_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
167 if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_OUTLEN)) != NULL
168 || (p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
169 return OSSL_PARAM_set_size_t(p, hmac_size(vmacctx));
174 static const OSSL_PARAM known_settable_ctx_params[] = {
175 /* "algorithm" and "digest" are the same parameter */
176 OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_ALGORITHM, NULL, 0),
177 OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_DIGEST, NULL, 0),
178 OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_ENGINE, NULL, 0),
179 OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_PROPERTIES, NULL, 0),
180 OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
181 OSSL_PARAM_int(OSSL_MAC_PARAM_FLAGS, NULL),
184 static const OSSL_PARAM *hmac_settable_ctx_params(void)
186 return known_settable_ctx_params;
190 * ALL parameters should be set before init().
192 static int hmac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
194 struct hmac_data_st *macctx = vmacctx;
197 if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_DIGEST)) != NULL
198 || (p = OSSL_PARAM_locate_const(params,
199 OSSL_MAC_PARAM_ALGORITHM)) != NULL) {
200 if (p->data_type != OSSL_PARAM_UTF8_STRING)
204 const char *algoname = p->data;
205 const char *propquery = NULL;
207 #ifndef FIPS_MODE /* Inside the FIPS module, we don't support engines */
208 ENGINE_finish(macctx->tmpengine);
209 macctx->tmpengine = NULL;
211 if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_ENGINE))
213 if (p->data_type != OSSL_PARAM_UTF8_STRING)
216 macctx->tmpengine = ENGINE_by_id(p->data);
217 if (macctx->tmpengine == NULL)
221 if ((p = OSSL_PARAM_locate_const(params,
222 OSSL_MAC_PARAM_PROPERTIES))
224 if (p->data_type != OSSL_PARAM_UTF8_STRING)
230 EVP_MD_meth_free(macctx->alloc_md);
232 macctx->tmpmd = macctx->alloc_md =
233 EVP_MD_fetch(PROV_LIBRARY_CONTEXT_OF(macctx->provctx),
234 algoname, propquery);
236 #ifndef FIPS_MODE /* Inside the FIPS module, we don't support legacy digests */
237 /* TODO(3.0) BEGIN legacy stuff, to be removed */
238 if (macctx->tmpmd == NULL)
239 macctx->tmpmd = EVP_get_digestbyname(algoname);
240 /* TODO(3.0) END of legacy stuff */
243 if (macctx->tmpmd == NULL)
247 /* TODO(3.0) formalize the meaning of "flags", perhaps as other params */
248 if ((p = OSSL_PARAM_locate_const(params,
249 OSSL_MAC_PARAM_FLAGS)) != NULL) {
252 if (!OSSL_PARAM_get_int(p, &flags))
254 HMAC_CTX_set_flags(macctx->ctx, flags);
256 if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
257 if (p->data_type != OSSL_PARAM_OCTET_STRING)
260 if (!HMAC_Init_ex(macctx->ctx, p->data, p->data_size,
261 macctx->tmpmd, NULL /* ENGINE */))
264 macctx->tmpmd = NULL;
265 macctx->tmpengine = NULL;
270 const OSSL_DISPATCH hmac_functions[] = {
271 { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))hmac_new },
272 { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))hmac_dup },
273 { OSSL_FUNC_MAC_FREECTX, (void (*)(void))hmac_free },
274 { OSSL_FUNC_MAC_INIT, (void (*)(void))hmac_init },
275 { OSSL_FUNC_MAC_UPDATE, (void (*)(void))hmac_update },
276 { OSSL_FUNC_MAC_FINAL, (void (*)(void))hmac_final },
277 { OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
278 (void (*)(void))hmac_gettable_ctx_params },
279 { OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))hmac_get_ctx_params },
280 { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
281 (void (*)(void))hmac_settable_ctx_params },
282 { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))hmac_set_ctx_params },