1 /*
2 * Elliptic curve DSA
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 /*
23 * References:
24 *
25 * SEC1 http://www.secg.org/index.php?action=secg,docs_secg
26 */
27
28 #define MBEDTLS_ECDSA_C
29 #if defined(MBEDTLS_ECDSA_C)
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <time.h>
33 #include "ecdsa.h"
34 #include "asn1write.h"
35
36 #include <string.h>
37
38 #if defined(MBEDTLS_ECDSA_DETERMINISTIC)
39 #include "mbedtls/hmac_drbg.h"
40 #endif
41
42 #define DEBUG(format,...) printf("[%s]:%d: "format"\n", __func__,__LINE__, ##__VA_ARGS__)
43
44 /*
45 * Derive a suitable integer for group grp from a buffer of length len
46 * SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3
47 */
derive_mpi(const mbedtls_ecp_group * grp,mbedtls_mpi * x,const unsigned char * buf,size_t blen)48 static int derive_mpi( const mbedtls_ecp_group *grp, mbedtls_mpi *x,
49 const unsigned char *buf, size_t blen )
50 {
51 int ret;
52 size_t n_size = ( grp->nbits + 7 ) / 8;
53 size_t use_size = blen > n_size ? n_size : blen;
54
55 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( x, buf, use_size ) );
56 if( use_size * 8 > grp->nbits )
57 MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( x, use_size * 8 - grp->nbits ) );
58
59 /* While at it, reduce modulo N */
60 if( mbedtls_mpi_cmp_mpi( x, &grp->N ) >= 0 )
61 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( x, x, &grp->N ) );
62
63 cleanup:
64 return( ret );
65 }
66
67 /*
68 * Compute ECDSA signature of a hashed message (SEC1 4.1.3)
69 * Obviously, compared to SEC1 4.1.3, we skip step 4 (hash message)
70 */
mbedtls_ecdsa_sign(mbedtls_ecp_group * grp,mbedtls_mpi * r,mbedtls_mpi * s,const mbedtls_mpi * d,const unsigned char * buf,size_t blen,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)71 int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
72 const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
73 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
74 {
75 int ret, key_tries, sign_tries, blind_tries;
76 mbedtls_ecp_point R;
77 mbedtls_mpi k, e, t;
78
79 /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
80 if( grp->N.p == NULL )
81 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
82
83 mbedtls_ecp_point_init( &R );
84 mbedtls_mpi_init( &k ); mbedtls_mpi_init( &e ); mbedtls_mpi_init( &t );
85
86 sign_tries = 0;
87 do
88 {
89 /*
90 * Steps 1-3: generate a suitable ephemeral keypair
91 * and set r = xR mod n
92 */
93 key_tries = 0;
94 do
95 {
96 MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair( grp, &k, &R, f_rng, p_rng ) );
97 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( r, &R.X, &grp->N ) );
98
99 if( key_tries++ > 10 )
100 {
101 ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
102 goto cleanup;
103 }
104 }
105 while( mbedtls_mpi_cmp_int( r, 0 ) == 0 );
106
107 /*
108 * Step 5: derive MPI from hashed message
109 */
110 MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) );
111
112 /*
113 * Generate a random value to blind inv_mod in next step,
114 * avoiding a potential timing leak.
115 */
116 blind_tries = 0;
117 do
118 {
119 size_t n_size = ( grp->nbits + 7 ) / 8;
120 MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &t, n_size, f_rng, p_rng ) );
121 MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &t, 8 * n_size - grp->nbits ) );
122
123 /* See mbedtls_ecp_gen_keypair() */
124 if( ++blind_tries > 30 )
125 return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
126 }
127 while( mbedtls_mpi_cmp_int( &t, 1 ) < 0 ||
128 mbedtls_mpi_cmp_mpi( &t, &grp->N ) >= 0 );
129
130 /*
131 * Step 6: compute s = (e + r * d) / k = t (e + rd) / (kt) mod n
132 */
133 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, r, d ) );
134 MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &e, &e, s ) );
135 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &e, &e, &t ) );
136 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &k, &k, &t ) );
137 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( s, &k, &grp->N ) );
138 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, s, &e ) );
139 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( s, s, &grp->N ) );
140
141 if( sign_tries++ > 10 )
142 {
143 ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
144 goto cleanup;
145 }
146 }
147 while( mbedtls_mpi_cmp_int( s, 0 ) == 0 );
148
149 cleanup:
150 mbedtls_ecp_point_free( &R );
151 mbedtls_mpi_free( &k ); mbedtls_mpi_free( &e ); mbedtls_mpi_free( &t );
152
153 return( ret );
154 }
155
156 #if defined(MBEDTLS_ECDSA_DETERMINISTIC)
157 /*
158 * Deterministic signature wrapper
159 */
mbedtls_ecdsa_sign_det(mbedtls_ecp_group * grp,mbedtls_mpi * r,mbedtls_mpi * s,const mbedtls_mpi * d,const unsigned char * buf,size_t blen,mbedtls_md_type_t md_alg)160 int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
161 const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
162 mbedtls_md_type_t md_alg )
163 {
164 int ret;
165 mbedtls_hmac_drbg_context rng_ctx;
166 unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES];
167 size_t grp_len = ( grp->nbits + 7 ) / 8;
168 const mbedtls_md_info_t *md_info;
169 mbedtls_mpi h;
170
171 if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
172 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
173
174 mbedtls_mpi_init( &h );
175 mbedtls_hmac_drbg_init( &rng_ctx );
176
177 /* Use private key and message hash (reduced) to initialize HMAC_DRBG */
178 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( d, data, grp_len ) );
179 MBEDTLS_MPI_CHK( derive_mpi( grp, &h, buf, blen ) );
180 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, data + grp_len, grp_len ) );
181 mbedtls_hmac_drbg_seed_buf( &rng_ctx, md_info, data, 2 * grp_len );
182
183 ret = mbedtls_ecdsa_sign( grp, r, s, d, buf, blen,
184 mbedtls_hmac_drbg_random, &rng_ctx );
185
186 cleanup:
187 mbedtls_hmac_drbg_free( &rng_ctx );
188 mbedtls_mpi_free( &h );
189
190 return( ret );
191 }
192 #endif /* MBEDTLS_ECDSA_DETERMINISTIC */
193
194 /*
195 * Verify ECDSA signature of hashed message (SEC1 4.1.4)
196 * Obviously, compared to SEC1 4.1.3, we skip step 2 (hash message)
197 */
mbedtls_ecdsa_verify(mbedtls_ecp_group * grp,const unsigned char * buf,size_t blen,const mbedtls_ecp_point * Q,const mbedtls_mpi * r,const mbedtls_mpi * s)198 int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
199 const unsigned char *buf, size_t blen,
200 const mbedtls_ecp_point *Q, const mbedtls_mpi *r, const mbedtls_mpi *s)
201 {
202 int ret;
203 mbedtls_mpi e, s_inv, u1, u2;
204 mbedtls_ecp_point R;
205
206 mbedtls_ecp_point_init( &R );
207 mbedtls_mpi_init( &e ); mbedtls_mpi_init( &s_inv ); mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 );
208
209 /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
210 if( grp->N.p == NULL )
211 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
212
213 /*
214 * Step 1: make sure r and s are in range 1..n-1
215 */
216 if( mbedtls_mpi_cmp_int( r, 1 ) < 0 || mbedtls_mpi_cmp_mpi( r, &grp->N ) >= 0 ||
217 mbedtls_mpi_cmp_int( s, 1 ) < 0 || mbedtls_mpi_cmp_mpi( s, &grp->N ) >= 0 )
218 {
219 ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
220 goto cleanup;
221 }
222
223 /*
224 * Additional precaution: make sure Q is valid
225 */
226 MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, Q ) );
227
228 /*
229 * Step 3: derive MPI from hashed message
230 */
231 MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) );
232
233 /*
234 * Step 4: u1 = e / s mod n, u2 = r / s mod n
235 */
236 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &s_inv, s, &grp->N ) );
237
238 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u1, &e, &s_inv ) );
239 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u1, &u1, &grp->N ) );
240
241 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u2, r, &s_inv ) );
242 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u2, &u2, &grp->N ) );
243
244 /*
245 * Step 5: R = u1 G + u2 Q
246 *
247 * Since we're not using any secret data, no need to pass a RNG to
248 * mbedtls_ecp_mul() for countermesures.
249 */
250 MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, &R, &u1, &grp->G, &u2, Q ) );
251
252 if( mbedtls_ecp_is_zero( &R ) )
253 {
254 ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
255 goto cleanup;
256 }
257
258 /*
259 * Step 6: convert xR to an integer (no-op)
260 * Step 7: reduce xR mod n (gives v)
261 */
262 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &R.X, &R.X, &grp->N ) );
263
264 /*
265 * Step 8: check if v (that is, R.X) is equal to r
266 */
267 if( mbedtls_mpi_cmp_mpi( &R.X, r ) != 0 )
268 {
269 ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
270 goto cleanup;
271 }
272
273 cleanup:
274 mbedtls_ecp_point_free( &R );
275 mbedtls_mpi_free( &e ); mbedtls_mpi_free( &s_inv ); mbedtls_mpi_free( &u1 ); mbedtls_mpi_free( &u2 );
276
277 return( ret );
278 }
279
280 /*
281 * Convert a signature (given by context) to ASN.1
282 */
ecdsa_signature_to_asn1(const mbedtls_mpi * r,const mbedtls_mpi * s,unsigned char * sig,size_t * slen)283 static int ecdsa_signature_to_asn1( const mbedtls_mpi *r, const mbedtls_mpi *s,
284 unsigned char *sig, size_t *slen )
285 {
286 int ret;
287 unsigned char buf[MBEDTLS_ECDSA_MAX_LEN];
288 unsigned char *p = buf + sizeof( buf );
289 size_t len = 0;
290
291 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, s ) );
292 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, r ) );
293
294 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, buf, len ) );
295 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, buf,
296 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
297
298 memcpy( sig, p, len );
299 *slen = len;
300
301 return( 0 );
302 }
303
304 /*
305 * Compute and write signature
306 */
mbedtls_ecdsa_write_signature(mbedtls_ecdsa_context * ctx,mbedtls_md_type_t md_alg,const unsigned char * hash,size_t hlen,unsigned char * sig,size_t * slen,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)307 int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg,
308 const unsigned char *hash, size_t hlen,
309 unsigned char *sig, size_t *slen,
310 int (*f_rng)(void *, unsigned char *, size_t),
311 void *p_rng )
312 {
313 int ret;
314 mbedtls_mpi r, s;
315
316 mbedtls_mpi_init( &r );
317 mbedtls_mpi_init( &s );
318
319 #if defined(MBEDTLS_ECDSA_DETERMINISTIC)
320 (void) f_rng;
321 (void) p_rng;
322
323 MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det( &ctx->grp, &r, &s, &ctx->d,
324 hash, hlen, md_alg ) );
325 #else
326 (void) md_alg;
327
328 MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ctx->grp, &r, &s, &ctx->d,
329 hash, hlen, f_rng, p_rng ) );
330 #endif
331
332 MBEDTLS_MPI_CHK( ecdsa_signature_to_asn1( &r, &s, sig, slen ) );
333
334 cleanup:
335 mbedtls_mpi_free( &r );
336 mbedtls_mpi_free( &s );
337
338 return( ret );
339 }
340
341 #if ! defined(MBEDTLS_DEPRECATED_REMOVED) && \
342 defined(MBEDTLS_ECDSA_DETERMINISTIC)
mbedtls_ecdsa_write_signature_det(mbedtls_ecdsa_context * ctx,const unsigned char * hash,size_t hlen,unsigned char * sig,size_t * slen,mbedtls_md_type_t md_alg)343 int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
344 const unsigned char *hash, size_t hlen,
345 unsigned char *sig, size_t *slen,
346 mbedtls_md_type_t md_alg )
347 {
348 return( mbedtls_ecdsa_write_signature( ctx, md_alg, hash, hlen, sig, slen,
349 NULL, NULL ) );
350 }
351 #endif
352
353 /*
354 * Read and check signature
355 */
mbedtls_ecdsa_read_signature(mbedtls_ecdsa_context * ctx,const unsigned char * hash,size_t hlen,const unsigned char * sig,size_t slen)356 int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
357 const unsigned char *hash, size_t hlen,
358 const unsigned char *sig, size_t slen )
359 {
360 int ret;
361 unsigned char *p = (unsigned char *) sig;
362 const unsigned char *end = sig + slen;
363 size_t len;
364 mbedtls_mpi r, s;
365
366 mbedtls_mpi_init( &r );
367 mbedtls_mpi_init( &s );
368
369 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
370 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
371 {
372 ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
373 goto cleanup;
374 }
375
376 if( p + len != end )
377 {
378 ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
379 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
380 goto cleanup;
381 }
382
383 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
384 ( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
385 {
386 ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
387 goto cleanup;
388 }
389
390 if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen,
391 &ctx->Q, &r, &s ) ) != 0 )
392 goto cleanup;
393
394 if( p != end )
395 ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
396
397 cleanup:
398 mbedtls_mpi_free( &r );
399 mbedtls_mpi_free( &s );
400
401 return( ret );
402 }
403
404 /*
405 * Generate key pair
406 */
mbedtls_ecdsa_genkey(mbedtls_ecdsa_context * ctx,mbedtls_ecp_group_id gid,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)407 int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
408 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
409 {
410 return( mbedtls_ecp_group_load( &ctx->grp, gid ) ||
411 mbedtls_ecp_gen_keypair( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) );
412 }
413
414 /*
415 * Set context from an mbedtls_ecp_keypair
416 */
mbedtls_ecdsa_from_keypair(mbedtls_ecdsa_context * ctx,const mbedtls_ecp_keypair * key)417 int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key )
418 {
419 int ret;
420
421 if( ( ret = mbedtls_ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 ||
422 ( ret = mbedtls_mpi_copy( &ctx->d, &key->d ) ) != 0 ||
423 ( ret = mbedtls_ecp_copy( &ctx->Q, &key->Q ) ) != 0 )
424 {
425 mbedtls_ecdsa_free( ctx );
426 }
427
428 return( ret );
429 }
430
431 /*
432 * Initialize context
433 */
mbedtls_ecdsa_init(mbedtls_ecdsa_context * ctx)434 void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx )
435 {
436 mbedtls_ecp_keypair_init( ctx );
437 }
438
439 /*
440 * Free context
441 */
mbedtls_ecdsa_free(mbedtls_ecdsa_context * ctx)442 void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx )
443 {
444 mbedtls_ecp_keypair_free( ctx );
445 }
446
rnd_std_rand(void * rng_state,unsigned char * output,size_t len)447 static int rnd_std_rand( void *rng_state, unsigned char *output, size_t len )
448 {
449 size_t i;
450 static int srand_flag = 1;
451
452 if(srand_flag) {
453 //srand(time(NULL));//������������ӡ�
454 srand(rand()+rand()+rand()+rand()*rand());
455 srand_flag = 0;
456 }
457
458 for( i = 0; i < len; ++i )
459 output[i] = rand();
460 return( 0 );
461 }
462
463 #if 0
464 int rk_ecdsa_sign(mbed_ecc_key_t *ec_key, unsigned char *hash, unsigned int hash_len,
465 unsigned char *sig, unsigned int *sig_len)
466 {
467 int ret;
468 mbedtls_ecp_group grp;
469 mbedtls_mpi r, s, d;
470 mbedtls_ecp_group_id gid;
471
472 mbedtls_mpi_init(&r);
473 mbedtls_mpi_init(&s);
474 mbedtls_mpi_init(&d);
475 mbedtls_ecp_group_init(&grp);
476
477 DEBUG("ec_key->curve = %d", ec_key->curve );
478 mbedtls_ecp_group_load(&grp, ec_key->curve);
479
480 MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(grp, &r, &s, d, hash, hash_len, rnd_std_rand, NULL));
481 MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, sig_len ));
482
483 cleanup:
484 mbedtls_mpi_free(&r);
485 mbedtls_mpi_free(&s);
486 mbedtls_mpi_free(&d);
487 mbedtls_ecp_group_free(&grp);
488 return ret;
489 }
490 #endif
491
rk_ecdsa_sign(const mbed_ecc_key_t * key,unsigned char * hash,unsigned int hash_len,unsigned char * sig,size_t * sig_len)492 int rk_ecdsa_sign(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
493 unsigned char *sig, size_t *sig_len)
494 {
495 int ret = -1;
496 mbedtls_ecp_group grp;
497 mbedtls_mpi r, s;
498 mbedtls_mpi pri_key;
499
500 mbedtls_ecp_group_init( &grp );
501 mbedtls_mpi_init( &pri_key);
502 mbedtls_mpi_init(&r);
503 mbedtls_mpi_init(&s);
504
505 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
506 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pri_key, key->d, key->d_len) );
507
508 if(mbedtls_ecp_check_privkey( &grp, &pri_key) != 0)
509 {
510 printf("mbedtls_ecp_check_privkey error\n");
511 return -1;
512 }
513
514 MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&grp, &r, &s, &pri_key, hash, hash_len, rnd_std_rand, NULL));
515 MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, sig_len ));
516 cleanup:
517 mbedtls_mpi_free(&r);
518 mbedtls_mpi_free(&s);
519 mbedtls_ecp_group_free( &grp );
520 mbedtls_mpi_free( &pri_key);
521 return ret;
522 }
523
rk_ecdsa_verify(const mbed_ecc_key_t * key,unsigned char * hash,unsigned int hash_len,unsigned char * sig,unsigned int sig_len)524 int rk_ecdsa_verify(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
525 unsigned char *sig, unsigned int sig_len)
526 {
527 int ret = -1;
528 mbedtls_ecp_group grp;
529 unsigned char *p = (unsigned char *) sig;
530 const unsigned char *end = sig + sig_len;
531 size_t len;
532 mbedtls_mpi r, s;
533 mbedtls_ecp_point pub_key;
534
535 mbedtls_ecp_group_init( &grp );
536 mbedtls_ecp_point_init( &pub_key);
537 mbedtls_mpi_init(&r);
538 mbedtls_mpi_init(&s);
539
540 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
541 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.X, key->x, key->x_len) );
542 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.Y, key->y, key->y_len) );
543 MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pub_key.Z, 1 ));
544
545 if(mbedtls_ecp_check_pubkey( &grp, &pub_key) != 0)
546 {
547 printf("mbedtls_ecp_check_privkey error\n");
548 return -1;
549 }
550
551 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
552 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
553 {
554 ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
555 goto cleanup;
556 }
557
558 if( p + len != end )
559 {
560 ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
561 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
562 goto cleanup;
563 }
564
565 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
566 ( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
567 {
568 ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
569 goto cleanup;
570 }
571
572 if( ( ret = mbedtls_ecdsa_verify( &grp, hash, hash_len, &pub_key, &r, &s ) ) != 0 )
573 goto cleanup;
574
575 if( p != end )
576 ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
577
578 cleanup:
579 mbedtls_mpi_free(&r);
580 mbedtls_mpi_free(&s);
581 mbedtls_ecp_group_free( &grp );
582 mbedtls_ecp_point_free( &pub_key);
583 return ret;
584 }
585
rk_ecdsa_sign2(const mbed_ecc_key_t * key,unsigned char * hash,unsigned int hash_len,unsigned char * r_data,unsigned int * r_len,unsigned char * s_data,unsigned int * s_len)586 int rk_ecdsa_sign2(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
587 unsigned char *r_data, unsigned int *r_len, unsigned char *s_data, unsigned int *s_len)
588 {
589 int ret = -1;
590 mbedtls_ecp_group grp;
591 mbedtls_mpi r, s;
592 mbedtls_mpi pri_key;
593
594 mbedtls_ecp_group_init( &grp );
595 mbedtls_mpi_init( &pri_key);
596 mbedtls_mpi_init(&r);
597 mbedtls_mpi_init(&s);
598
599 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
600 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pri_key, key->d, key->d_len) );
601
602 if(mbedtls_ecp_check_privkey( &grp, &pri_key) != 0)
603 {
604 printf("mbedtls_ecp_check_privkey error\n");
605 return -1;
606 }
607
608 MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&grp, &r, &s, &pri_key, hash, hash_len, rnd_std_rand, NULL));
609
610 *r_len = mbedtls_mpi_size(&r);
611 mbedtls_mpi_write_binary(&r, r_data, *r_len);
612
613 *s_len = mbedtls_mpi_size(&s);
614 mbedtls_mpi_write_binary(&s, s_data, *s_len);
615 cleanup:
616 mbedtls_mpi_free(&r);
617 mbedtls_mpi_free(&s);
618 mbedtls_ecp_group_free( &grp );
619 mbedtls_mpi_free( &pri_key);
620 return ret;
621 }
622
rk_ecdsa_verify2(const mbed_ecc_key_t * key,unsigned char * hash,unsigned int hash_len,unsigned char * r_data,unsigned int r_len,unsigned char * s_data,unsigned int s_len)623 int rk_ecdsa_verify2(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
624 unsigned char *r_data, unsigned int r_len, unsigned char *s_data, unsigned int s_len)
625 {
626 int ret = -1;
627 mbedtls_ecp_group grp;
628 mbedtls_mpi r, s;
629 mbedtls_ecp_point pub_key;
630
631 mbedtls_ecp_group_init( &grp );
632 mbedtls_ecp_point_init( &pub_key);
633 mbedtls_mpi_init(&r);
634 mbedtls_mpi_init(&s);
635
636 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r, r_data, r_len) );
637 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s, s_data, s_len) );
638
639 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
640 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.X, key->x, key->x_len) );
641 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.Y, key->y, key->y_len) );
642 MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pub_key.Z, 1 ));
643
644 if(mbedtls_ecp_check_pubkey( &grp, &pub_key) != 0)
645 {
646 printf("mbedtls_ecp_check_privkey error\n");
647 return -1;
648 }
649
650 if( ( ret = mbedtls_ecdsa_verify( &grp, hash, hash_len, &pub_key, &r, &s ) ) != 0 )
651 goto cleanup;
652
653
654 cleanup:
655 mbedtls_mpi_free(&r);
656 mbedtls_mpi_free(&s);
657 mbedtls_ecp_group_free( &grp );
658 mbedtls_ecp_point_free( &pub_key);
659 return ret;
660 }
661
662
663 #endif /* MBEDTLS_ECDSA_C */
664