| 1 | /* |
| 2 | * Elliptic curve DSA |
| 3 | * |
| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
| 5 | * SPDX-License-Identifier: GPL-2.0 |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * This file is part of mbed TLS (https://tls.mbed.org) |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * References: |
| 26 | * |
| 27 | * SEC1 http://www.secg.org/index.php?action=secg,docs_secg |
| 28 | */ |
| 29 | |
| 30 | #if !defined(MBEDTLS_CONFIG_FILE) |
| 31 | #include "mbedtls/config.h" |
| 32 | #else |
| 33 | #include MBEDTLS_CONFIG_FILE |
| 34 | #endif |
| 35 | |
| 36 | #if defined(MBEDTLS_ECDSA_C) |
| 37 | |
| 38 | #include "mbedtls/ecdsa.h" |
| 39 | #include "mbedtls/asn1write.h" |
| 40 | |
| 41 | #include <string.h> |
| 42 | |
| 43 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 44 | #include "mbedtls/hmac_drbg.h" |
| 45 | #endif |
| 46 | |
| 47 | /* |
| 48 | * Derive a suitable integer for group grp from a buffer of length len |
| 49 | * SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3 |
| 50 | */ |
| 51 | static int derive_mpi( const mbedtls_ecp_group *grp, mbedtls_mpi *x, |
| 52 | const unsigned char *buf, size_t blen ) |
| 53 | { |
| 54 | int ret; |
| 55 | size_t n_size = ( grp->nbits + 7 ) / 8; |
| 56 | size_t use_size = blen > n_size ? n_size : blen; |
| 57 | |
| 58 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( x, buf, use_size ) ); |
| 59 | if( use_size * 8 > grp->nbits ) |
| 60 | MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( x, use_size * 8 - grp->nbits ) ); |
| 61 | |
| 62 | /* While at it, reduce modulo N */ |
| 63 | if( mbedtls_mpi_cmp_mpi( x, &grp->N ) >= 0 ) |
| 64 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( x, x, &grp->N ) ); |
| 65 | |
| 66 | cleanup: |
| 67 | return( ret ); |
| 68 | } |
| 69 | |
| 70 | #if !defined(MBEDTLS_ECDSA_SIGN_ALT) |
| 71 | /* |
| 72 | * Compute ECDSA signature of a hashed message (SEC1 4.1.3) |
| 73 | * Obviously, compared to SEC1 4.1.3, we skip step 4 (hash message) |
| 74 | */ |
| 75 | int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s, |
| 76 | const mbedtls_mpi *d, const unsigned char *buf, size_t blen, |
| 77 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) |
| 78 | { |
| 79 | int ret, key_tries, sign_tries, blind_tries; |
| 80 | mbedtls_ecp_point R; |
| 81 | mbedtls_mpi k, e, t; |
| 82 | |
| 83 | /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */ |
| 84 | if( grp->N.p == NULL ) |
| 85 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); |
| 86 | |
| 87 | /* Make sure d is in range 1..n-1 */ |
| 88 | if( mbedtls_mpi_cmp_int( d, 1 ) < 0 || mbedtls_mpi_cmp_mpi( d, &grp->N ) >= 0 ) |
| 89 | return( MBEDTLS_ERR_ECP_INVALID_KEY ); |
| 90 | |
| 91 | mbedtls_ecp_point_init( &R ); |
| 92 | mbedtls_mpi_init( &k ); mbedtls_mpi_init( &e ); mbedtls_mpi_init( &t ); |
| 93 | |
| 94 | sign_tries = 0; |
| 95 | do |
| 96 | { |
| 97 | /* |
| 98 | * Steps 1-3: generate a suitable ephemeral keypair |
| 99 | * and set r = xR mod n |
| 100 | */ |
| 101 | key_tries = 0; |
| 102 | do |
| 103 | { |
| 104 | MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair( grp, &k, &R, f_rng, p_rng ) ); |
| 105 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( r, &R.X, &grp->N ) ); |
| 106 | |
| 107 | if( key_tries++ > 10 ) |
| 108 | { |
| 109 | ret = MBEDTLS_ERR_ECP_RANDOM_FAILED; |
| 110 | goto cleanup; |
| 111 | } |
| 112 | } |
| 113 | while( mbedtls_mpi_cmp_int( r, 0 ) == 0 ); |
| 114 | |
| 115 | /* |
| 116 | * Step 5: derive MPI from hashed message |
| 117 | */ |
| 118 | MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) ); |
| 119 | |
| 120 | /* |
| 121 | * Generate a random value to blind inv_mod in next step, |
| 122 | * avoiding a potential timing leak. |
| 123 | */ |
| 124 | blind_tries = 0; |
| 125 | do |
| 126 | { |
| 127 | size_t n_size = ( grp->nbits + 7 ) / 8; |
| 128 | MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &t, n_size, f_rng, p_rng ) ); |
| 129 | MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &t, 8 * n_size - grp->nbits ) ); |
| 130 | |
| 131 | /* See mbedtls_ecp_gen_keypair() */ |
| 132 | if( ++blind_tries > 30 ) |
| 133 | return( MBEDTLS_ERR_ECP_RANDOM_FAILED ); |
| 134 | } |
| 135 | while( mbedtls_mpi_cmp_int( &t, 1 ) < 0 || |
| 136 | mbedtls_mpi_cmp_mpi( &t, &grp->N ) >= 0 ); |
| 137 | |
| 138 | /* |
| 139 | * Step 6: compute s = (e + r * d) / k = t (e + rd) / (kt) mod n |
| 140 | */ |
| 141 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, r, d ) ); |
| 142 | MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &e, &e, s ) ); |
| 143 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &e, &e, &t ) ); |
| 144 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &k, &k, &t ) ); |
| 145 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( s, &k, &grp->N ) ); |
| 146 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, s, &e ) ); |
| 147 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( s, s, &grp->N ) ); |
| 148 | |
| 149 | if( sign_tries++ > 10 ) |
| 150 | { |
| 151 | ret = MBEDTLS_ERR_ECP_RANDOM_FAILED; |
| 152 | goto cleanup; |
| 153 | } |
| 154 | } |
| 155 | while( mbedtls_mpi_cmp_int( s, 0 ) == 0 ); |
| 156 | |
| 157 | cleanup: |
| 158 | mbedtls_ecp_point_free( &R ); |
| 159 | mbedtls_mpi_free( &k ); mbedtls_mpi_free( &e ); mbedtls_mpi_free( &t ); |
| 160 | |
| 161 | return( ret ); |
| 162 | } |
| 163 | #endif /* MBEDTLS_ECDSA_SIGN_ALT */ |
| 164 | |
| 165 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 166 | /* |
| 167 | * Deterministic signature wrapper |
| 168 | */ |
| 169 | int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s, |
| 170 | const mbedtls_mpi *d, const unsigned char *buf, size_t blen, |
| 171 | mbedtls_md_type_t md_alg ) |
| 172 | { |
| 173 | int ret; |
| 174 | mbedtls_hmac_drbg_context rng_ctx; |
| 175 | unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES]; |
| 176 | size_t grp_len = ( grp->nbits + 7 ) / 8; |
| 177 | const mbedtls_md_info_t *md_info; |
| 178 | mbedtls_mpi h; |
| 179 | |
| 180 | if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL ) |
| 181 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); |
| 182 | |
| 183 | mbedtls_mpi_init( &h ); |
| 184 | mbedtls_hmac_drbg_init( &rng_ctx ); |
| 185 | |
| 186 | /* Use private key and message hash (reduced) to initialize HMAC_DRBG */ |
| 187 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( d, data, grp_len ) ); |
| 188 | MBEDTLS_MPI_CHK( derive_mpi( grp, &h, buf, blen ) ); |
| 189 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, data + grp_len, grp_len ) ); |
| 190 | mbedtls_hmac_drbg_seed_buf( &rng_ctx, md_info, data, 2 * grp_len ); |
| 191 | |
| 192 | ret = mbedtls_ecdsa_sign( grp, r, s, d, buf, blen, |
| 193 | mbedtls_hmac_drbg_random, &rng_ctx ); |
| 194 | |
| 195 | cleanup: |
| 196 | mbedtls_hmac_drbg_free( &rng_ctx ); |
| 197 | mbedtls_mpi_free( &h ); |
| 198 | |
| 199 | return( ret ); |
| 200 | } |
| 201 | #endif /* MBEDTLS_ECDSA_DETERMINISTIC */ |
| 202 | |
| 203 | #if !defined(MBEDTLS_ECDSA_VERIFY_ALT) |
| 204 | /* |
| 205 | * Verify ECDSA signature of hashed message (SEC1 4.1.4) |
| 206 | * Obviously, compared to SEC1 4.1.3, we skip step 2 (hash message) |
| 207 | */ |
| 208 | int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp, |
| 209 | const unsigned char *buf, size_t blen, |
| 210 | const mbedtls_ecp_point *Q, const mbedtls_mpi *r, const mbedtls_mpi *s) |
| 211 | { |
| 212 | int ret; |
| 213 | mbedtls_mpi e, s_inv, u1, u2; |
| 214 | mbedtls_ecp_point R; |
| 215 | |
| 216 | mbedtls_ecp_point_init( &R ); |
| 217 | mbedtls_mpi_init( &e ); mbedtls_mpi_init( &s_inv ); mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 ); |
| 218 | |
| 219 | /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */ |
| 220 | if( grp->N.p == NULL ) |
| 221 | return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); |
| 222 | |
| 223 | /* |
| 224 | * Step 1: make sure r and s are in range 1..n-1 |
| 225 | */ |
| 226 | if( mbedtls_mpi_cmp_int( r, 1 ) < 0 || mbedtls_mpi_cmp_mpi( r, &grp->N ) >= 0 || |
| 227 | mbedtls_mpi_cmp_int( s, 1 ) < 0 || mbedtls_mpi_cmp_mpi( s, &grp->N ) >= 0 ) |
| 228 | { |
| 229 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; |
| 230 | goto cleanup; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * Additional precaution: make sure Q is valid |
| 235 | */ |
| 236 | MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, Q ) ); |
| 237 | |
| 238 | /* |
| 239 | * Step 3: derive MPI from hashed message |
| 240 | */ |
| 241 | MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) ); |
| 242 | |
| 243 | /* |
| 244 | * Step 4: u1 = e / s mod n, u2 = r / s mod n |
| 245 | */ |
| 246 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &s_inv, s, &grp->N ) ); |
| 247 | |
| 248 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u1, &e, &s_inv ) ); |
| 249 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u1, &u1, &grp->N ) ); |
| 250 | |
| 251 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u2, r, &s_inv ) ); |
| 252 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u2, &u2, &grp->N ) ); |
| 253 | |
| 254 | /* |
| 255 | * Step 5: R = u1 G + u2 Q |
| 256 | * |
| 257 | * Since we're not using any secret data, no need to pass a RNG to |
| 258 | * mbedtls_ecp_mul() for countermesures. |
| 259 | */ |
| 260 | MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, &R, &u1, &grp->G, &u2, Q ) ); |
| 261 | |
| 262 | if( mbedtls_ecp_is_zero( &R ) ) |
| 263 | { |
| 264 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; |
| 265 | goto cleanup; |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Step 6: convert xR to an integer (no-op) |
| 270 | * Step 7: reduce xR mod n (gives v) |
| 271 | */ |
| 272 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &R.X, &R.X, &grp->N ) ); |
| 273 | |
| 274 | /* |
| 275 | * Step 8: check if v (that is, R.X) is equal to r |
| 276 | */ |
| 277 | if( mbedtls_mpi_cmp_mpi( &R.X, r ) != 0 ) |
| 278 | { |
| 279 | ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; |
| 280 | goto cleanup; |
| 281 | } |
| 282 | |
| 283 | cleanup: |
| 284 | mbedtls_ecp_point_free( &R ); |
| 285 | mbedtls_mpi_free( &e ); mbedtls_mpi_free( &s_inv ); mbedtls_mpi_free( &u1 ); mbedtls_mpi_free( &u2 ); |
| 286 | |
| 287 | return( ret ); |
| 288 | } |
| 289 | #endif /* MBEDTLS_ECDSA_VERIFY_ALT */ |
| 290 | |
| 291 | /* |
| 292 | * Convert a signature (given by context) to ASN.1 |
| 293 | */ |
| 294 | int ecdsa_signature_to_asn1( const mbedtls_mpi *r, const mbedtls_mpi *s, |
| 295 | unsigned char *sig, size_t *slen ) |
| 296 | { |
| 297 | int ret; |
| 298 | unsigned char buf[MBEDTLS_ECDSA_MAX_LEN]; |
| 299 | unsigned char *p = buf + sizeof( buf ); |
| 300 | size_t len = 0; |
| 301 | |
| 302 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, s ) ); |
| 303 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, r ) ); |
| 304 | |
| 305 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, buf, len ) ); |
| 306 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, buf, |
| 307 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ); |
| 308 | |
| 309 | memcpy( sig, p, len ); |
| 310 | *slen = len; |
| 311 | |
| 312 | return( 0 ); |
| 313 | } |
| 314 | |
| 315 | /* |
| 316 | * Compute and write signature |
| 317 | */ |
| 318 | int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg, |
| 319 | const unsigned char *hash, size_t hlen, |
| 320 | unsigned char *sig, size_t *slen, |
| 321 | int (*f_rng)(void *, unsigned char *, size_t), |
| 322 | void *p_rng ) |
| 323 | { |
| 324 | int ret; |
| 325 | mbedtls_mpi r, s; |
| 326 | |
| 327 | mbedtls_mpi_init( &r ); |
| 328 | mbedtls_mpi_init( &s ); |
| 329 | |
| 330 | #if defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 331 | (void) f_rng; |
| 332 | (void) p_rng; |
| 333 | |
| 334 | MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det( &ctx->grp, &r, &s, &ctx->d, |
| 335 | hash, hlen, md_alg ) ); |
| 336 | #else |
| 337 | (void) md_alg; |
| 338 | |
| 339 | MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ctx->grp, &r, &s, &ctx->d, |
| 340 | hash, hlen, f_rng, p_rng ) ); |
| 341 | #endif |
| 342 | |
| 343 | MBEDTLS_MPI_CHK( ecdsa_signature_to_asn1( &r, &s, sig, slen ) ); |
| 344 | |
| 345 | cleanup: |
| 346 | mbedtls_mpi_free( &r ); |
| 347 | mbedtls_mpi_free( &s ); |
| 348 | |
| 349 | return( ret ); |
| 350 | } |
| 351 | |
| 352 | #if ! defined(MBEDTLS_DEPRECATED_REMOVED) && \ |
| 353 | defined(MBEDTLS_ECDSA_DETERMINISTIC) |
| 354 | int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx, |
| 355 | const unsigned char *hash, size_t hlen, |
| 356 | unsigned char *sig, size_t *slen, |
| 357 | mbedtls_md_type_t md_alg ) |
| 358 | { |
| 359 | return( mbedtls_ecdsa_write_signature( ctx, md_alg, hash, hlen, sig, slen, |
| 360 | NULL, NULL ) ); |
| 361 | } |
| 362 | #endif |
| 363 | |
| 364 | /* |
| 365 | * Read and check signature |
| 366 | */ |
| 367 | int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx, |
| 368 | const unsigned char *hash, size_t hlen, |
| 369 | const unsigned char *sig, size_t slen ) |
| 370 | { |
| 371 | int ret; |
| 372 | unsigned char *p = (unsigned char *) sig; |
| 373 | const unsigned char *end = sig + slen; |
| 374 | size_t len; |
| 375 | mbedtls_mpi r, s; |
| 376 | |
| 377 | mbedtls_mpi_init( &r ); |
| 378 | mbedtls_mpi_init( &s ); |
| 379 | |
| 380 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| 381 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 382 | { |
| 383 | ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 384 | goto cleanup; |
| 385 | } |
| 386 | |
| 387 | if( p + len != end ) |
| 388 | { |
| 389 | ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA + |
| 390 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH; |
| 391 | goto cleanup; |
| 392 | } |
| 393 | |
| 394 | if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 || |
| 395 | ( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 ) |
| 396 | { |
| 397 | ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA; |
| 398 | goto cleanup; |
| 399 | } |
| 400 | |
| 401 | if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen, |
| 402 | &ctx->Q, &r, &s ) ) != 0 ) |
| 403 | goto cleanup; |
| 404 | |
| 405 | /* At this point we know that the buffer starts with a valid signature. |
| 406 | * Return 0 if the buffer just contains the signature, and a specific |
| 407 | * error code if the valid signature is followed by more data. */ |
| 408 | if( p != end ) |
| 409 | ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH; |
| 410 | |
| 411 | cleanup: |
| 412 | mbedtls_mpi_free( &r ); |
| 413 | mbedtls_mpi_free( &s ); |
| 414 | |
| 415 | return( ret ); |
| 416 | } |
| 417 | |
| 418 | #if !defined(MBEDTLS_ECDSA_GENKEY_ALT) |
| 419 | /* |
| 420 | * Generate key pair |
| 421 | */ |
| 422 | int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid, |
| 423 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) |
| 424 | { |
| 425 | return( mbedtls_ecp_group_load( &ctx->grp, gid ) || |
| 426 | mbedtls_ecp_gen_keypair( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) ); |
| 427 | } |
| 428 | #endif /* MBEDTLS_ECDSA_GENKEY_ALT */ |
| 429 | |
| 430 | /* |
| 431 | * Set context from an mbedtls_ecp_keypair |
| 432 | */ |
| 433 | int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key ) |
| 434 | { |
| 435 | int ret; |
| 436 | |
| 437 | if( ( ret = mbedtls_ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 || |
| 438 | ( ret = mbedtls_mpi_copy( &ctx->d, &key->d ) ) != 0 || |
| 439 | ( ret = mbedtls_ecp_copy( &ctx->Q, &key->Q ) ) != 0 ) |
| 440 | { |
| 441 | mbedtls_ecdsa_free( ctx ); |
| 442 | } |
| 443 | |
| 444 | return( ret ); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Initialize context |
| 449 | */ |
| 450 | void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx ) |
| 451 | { |
| 452 | mbedtls_ecp_keypair_init( ctx ); |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | * Free context |
| 457 | */ |
| 458 | void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx ) |
| 459 | { |
| 460 | mbedtls_ecp_keypair_free( ctx ); |
| 461 | } |
| 462 | |
| 463 | #endif /* MBEDTLS_ECDSA_C */ |