2 #include <openssl/cmac.h>
3 #include <openssl/conf.h>
4 #include <openssl/err.h>
5 #include <openssl/evp.h>
7 #include "e_gost_err.h"
10 #define min(a,b) (((a) < (b)) ? (a) : (b))
12 typedef struct omac_ctx {
19 #define MAX_GOST_OMAC_SIZE 16
21 static int omac_init(EVP_MD_CTX *ctx, int cipher_nid)
23 OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
24 memset(c, 0, sizeof(OMAC_CTX));
25 c->cipher_nid = cipher_nid;
33 case NID_grasshopper_cbc:
41 static int magma_imit_init(EVP_MD_CTX *ctx)
43 return omac_init(ctx, NID_magma_cbc);
46 static int grasshopper_imit_init(EVP_MD_CTX *ctx)
48 return omac_init(ctx, NID_grasshopper_cbc);
51 static int omac_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
53 OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
55 GOSTerr(GOST_F_OMAC_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
59 return CMAC_Update(c->cmac_ctx, data, count);
62 int omac_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
64 OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
65 unsigned char mac[MAX_GOST_OMAC_SIZE];
66 size_t mac_size = sizeof(mac);
69 GOSTerr(GOST_F_OMAC_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
73 CMAC_Final(c->cmac_ctx, mac, &mac_size);
75 memcpy(md, mac, c->dgst_size);
79 int omac_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
81 OMAC_CTX *c_to = EVP_MD_CTX_md_data(to);
82 const OMAC_CTX *c_from = EVP_MD_CTX_md_data(from);
85 c_to->dgst_size = c_from->dgst_size;
86 c_to->cipher_nid = c_from->cipher_nid;
87 c_to->key_set = c_from->key_set;
91 if (!c_from->cmac_ctx) {
93 CMAC_CTX_free(c_to->cmac_ctx);
94 c_to->cmac_ctx = NULL;
98 if (c_to->cmac_ctx == c_from->cmac_ctx) {
99 c_to->cmac_ctx = CMAC_CTX_new();
101 return CMAC_CTX_copy(c_to->cmac_ctx, c_from->cmac_ctx);
104 /* Clean up imit ctx */
105 int omac_imit_cleanup(EVP_MD_CTX *ctx)
107 OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
110 CMAC_CTX_free(c->cmac_ctx);
111 memset(EVP_MD_CTX_md_data(ctx), 0, sizeof(OMAC_CTX));
116 static int omac_key(OMAC_CTX * c, const EVP_CIPHER *cipher,
117 const unsigned char *key, size_t key_size)
121 c->cmac_ctx = CMAC_CTX_new();
122 if (c->cmac_ctx == NULL) {
123 GOSTerr(GOST_F_OMAC_KEY, ERR_R_MALLOC_FAILURE);
127 ret = CMAC_Init(c->cmac_ctx, key, key_size, cipher, NULL);
134 int omac_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
137 case EVP_MD_CTRL_KEY_LEN:
138 *((unsigned int *)(ptr)) = 32;
140 case EVP_MD_CTRL_SET_KEY:
142 OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
143 const EVP_MD *md = EVP_MD_CTX_md(ctx);
144 const EVP_CIPHER *cipher = NULL;
146 if (c->cipher_nid == NID_undef) {
147 switch (EVP_MD_nid(md)) {
149 c->cipher_nid = NID_magma_cbc;
152 case NID_grasshopper_mac:
153 c->cipher_nid = NID_grasshopper_cbc;
157 cipher = EVP_get_cipherbynid(c->cipher_nid);
159 if (cipher == NULL) {
160 GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_CIPHER_NOT_FOUND);
163 if (EVP_MD_meth_get_init(EVP_MD_CTX_md(ctx)) (ctx) <= 0) {
164 GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_MAC_KEY_NOT_SET);
167 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_NO_INIT);
170 GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_BAD_ORDER);
175 struct gost_mac_key *key = (struct gost_mac_key *)ptr;
176 return omac_key(c, cipher, key->key, 32);
178 } else if (arg == 32) {
179 return omac_key(c, cipher, ptr, 32);
181 GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_SIZE);
184 case EVP_MD_CTRL_MAC_LEN:
186 OMAC_CTX *c = EVP_MD_CTX_md_data(ctx);
187 switch (c->cipher_nid) {
189 if (arg < 1 || arg > 8) {
190 GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_INVALID_MAC_SIZE);
195 case NID_grasshopper_cbc:
196 if (arg < 1 || arg > 16) {
197 GOSTerr(GOST_F_OMAC_IMIT_CTRL, GOST_R_INVALID_MAC_SIZE);
213 static EVP_MD *_hidden_magma_mac_md = NULL;
215 EVP_MD *magma_omac(void)
217 if (_hidden_magma_mac_md == NULL) {
220 if ((md = EVP_MD_meth_new(NID_magma_mac, NID_undef)) == NULL
221 || !EVP_MD_meth_set_result_size(md, 4)
222 || !EVP_MD_meth_set_input_blocksize(md, 8)
223 || !EVP_MD_meth_set_app_datasize(md, sizeof(OMAC_CTX))
224 || !EVP_MD_meth_set_flags(md, 0)
225 || !EVP_MD_meth_set_init(md, magma_imit_init)
226 || !EVP_MD_meth_set_update(md, omac_imit_update)
227 || !EVP_MD_meth_set_final(md, omac_imit_final)
228 || !EVP_MD_meth_set_copy(md, omac_imit_copy)
229 || !EVP_MD_meth_set_cleanup(md, omac_imit_cleanup)
230 || !EVP_MD_meth_set_ctrl(md, omac_imit_ctrl)) {
231 EVP_MD_meth_free(md);
234 _hidden_magma_mac_md = md;
236 return _hidden_magma_mac_md;
239 void magma_omac_destroy(void)
241 EVP_MD_meth_free(_hidden_magma_mac_md);
242 _hidden_magma_mac_md = NULL;
245 static EVP_MD *_hidden_grasshopper_mac_md = NULL;
247 EVP_MD *grasshopper_omac(void)
249 if (_hidden_grasshopper_mac_md == NULL) {
252 if ((md = EVP_MD_meth_new(NID_grasshopper_mac, NID_undef)) == NULL
253 || !EVP_MD_meth_set_result_size(md, 8)
254 || !EVP_MD_meth_set_input_blocksize(md, 8)
255 || !EVP_MD_meth_set_app_datasize(md, sizeof(OMAC_CTX))
256 || !EVP_MD_meth_set_flags(md, 0)
257 || !EVP_MD_meth_set_init(md, grasshopper_imit_init)
258 || !EVP_MD_meth_set_update(md, omac_imit_update)
259 || !EVP_MD_meth_set_final(md, omac_imit_final)
260 || !EVP_MD_meth_set_copy(md, omac_imit_copy)
261 || !EVP_MD_meth_set_cleanup(md, omac_imit_cleanup)
262 || !EVP_MD_meth_set_ctrl(md, omac_imit_ctrl)) {
263 EVP_MD_meth_free(md);
266 _hidden_grasshopper_mac_md = md;
268 return _hidden_grasshopper_mac_md;
271 void grasshopper_omac_destroy(void)
273 EVP_MD_meth_free(_hidden_grasshopper_mac_md);
274 _hidden_grasshopper_mac_md = NULL;