Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 2 | * project 2006. |
| 3 | */ |
| 4 | /* ==================================================================== |
| 5 | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in |
| 16 | * the documentation and/or other materials provided with the |
| 17 | * distribution. |
| 18 | * |
| 19 | * 3. All advertising materials mentioning features or use of this |
| 20 | * software must display the following acknowledgment: |
| 21 | * "This product includes software developed by the OpenSSL Project |
| 22 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 23 | * |
| 24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 25 | * endorse or promote products derived from this software without |
| 26 | * prior written permission. For written permission, please contact |
| 27 | * licensing@OpenSSL.org. |
| 28 | * |
| 29 | * 5. Products derived from this software may not be called "OpenSSL" |
| 30 | * nor may "OpenSSL" appear in their names without prior written |
| 31 | * permission of the OpenSSL Project. |
| 32 | * |
| 33 | * 6. Redistributions of any form whatsoever must retain the following |
| 34 | * acknowledgment: |
| 35 | * "This product includes software developed by the OpenSSL Project |
| 36 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 37 | * |
| 38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 49 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 50 | * ==================================================================== |
| 51 | * |
| 52 | * This product includes cryptographic software written by Eric Young |
| 53 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 54 | * Hudson (tjh@cryptsoft.com). |
| 55 | * |
| 56 | */ |
| 57 | |
| 58 | #include <stdio.h> |
| 59 | #include "cryptlib.h" |
| 60 | #include <openssl/asn1t.h> |
| 61 | #include <openssl/x509.h> |
| 62 | #include <openssl/ec.h> |
| 63 | #include <openssl/ecdsa.h> |
| 64 | #include <openssl/evp.h> |
| 65 | #include "evp_locl.h" |
| 66 | |
| 67 | /* EC pkey context structure */ |
| 68 | |
| 69 | typedef struct |
| 70 | { |
| 71 | /* Key and paramgen group */ |
| 72 | EC_GROUP *gen_group; |
| 73 | /* message digest */ |
| 74 | const EVP_MD *md; |
| 75 | } EC_PKEY_CTX; |
| 76 | |
| 77 | static int pkey_ec_init(EVP_PKEY_CTX *ctx) |
| 78 | { |
| 79 | EC_PKEY_CTX *dctx; |
| 80 | dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX)); |
| 81 | if (!dctx) |
| 82 | return 0; |
| 83 | dctx->gen_group = NULL; |
| 84 | dctx->md = NULL; |
| 85 | |
| 86 | ctx->data = dctx; |
| 87 | |
| 88 | return 1; |
| 89 | } |
| 90 | |
| 91 | static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) |
| 92 | { |
| 93 | EC_PKEY_CTX *dctx, *sctx; |
| 94 | if (!pkey_ec_init(dst)) |
| 95 | return 0; |
| 96 | sctx = src->data; |
| 97 | dctx = dst->data; |
| 98 | if (sctx->gen_group) |
| 99 | { |
| 100 | dctx->gen_group = EC_GROUP_dup(sctx->gen_group); |
| 101 | if (!dctx->gen_group) |
| 102 | return 0; |
| 103 | } |
| 104 | dctx->md = sctx->md; |
| 105 | return 1; |
| 106 | } |
| 107 | |
| 108 | static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) |
| 109 | { |
| 110 | EC_PKEY_CTX *dctx = ctx->data; |
| 111 | if (dctx) |
| 112 | { |
| 113 | if (dctx->gen_group) |
| 114 | EC_GROUP_free(dctx->gen_group); |
| 115 | OPENSSL_free(dctx); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, |
| 120 | const unsigned char *tbs, size_t tbslen) |
| 121 | { |
| 122 | int ret, type; |
| 123 | unsigned int sltmp; |
| 124 | EC_PKEY_CTX *dctx = ctx->data; |
| 125 | EC_KEY *ec = ctx->pkey->pkey.ec; |
| 126 | |
| 127 | if (!sig) |
| 128 | { |
| 129 | *siglen = ECDSA_size(ec); |
| 130 | return 1; |
| 131 | } |
| 132 | else if(*siglen < (size_t)ECDSA_size(ec)) |
| 133 | { |
| 134 | ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | if (dctx->md) |
| 139 | type = EVP_MD_type(dctx->md); |
| 140 | else |
| 141 | type = NID_sha1; |
| 142 | |
| 143 | |
| 144 | ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec); |
| 145 | |
| 146 | if (ret <= 0) |
| 147 | return ret; |
| 148 | *siglen = (size_t)sltmp; |
| 149 | return 1; |
| 150 | } |
| 151 | |
| 152 | static int pkey_ec_verify(EVP_PKEY_CTX *ctx, |
| 153 | const unsigned char *sig, size_t siglen, |
| 154 | const unsigned char *tbs, size_t tbslen) |
| 155 | { |
| 156 | int ret, type; |
| 157 | EC_PKEY_CTX *dctx = ctx->data; |
| 158 | EC_KEY *ec = ctx->pkey->pkey.ec; |
| 159 | |
| 160 | if (dctx->md) |
| 161 | type = EVP_MD_type(dctx->md); |
| 162 | else |
| 163 | type = NID_sha1; |
| 164 | |
| 165 | ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec); |
| 166 | |
| 167 | return ret; |
| 168 | } |
| 169 | |
| 170 | static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) |
| 171 | { |
| 172 | int ret; |
| 173 | size_t outlen; |
| 174 | const EC_POINT *pubkey = NULL; |
| 175 | if (!ctx->pkey || !ctx->peerkey) |
| 176 | { |
| 177 | ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET); |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | if (!key) |
| 182 | { |
| 183 | const EC_GROUP *group; |
| 184 | group = EC_KEY_get0_group(ctx->pkey->pkey.ec); |
| 185 | *keylen = (EC_GROUP_get_degree(group) + 7)/8; |
| 186 | return 1; |
| 187 | } |
| 188 | |
| 189 | pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec); |
| 190 | |
| 191 | /* NB: unlike PKS#3 DH, if *outlen is less than maximum size this is |
| 192 | * not an error, the result is truncated. |
| 193 | */ |
| 194 | |
| 195 | outlen = *keylen; |
| 196 | |
| 197 | ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0); |
| 198 | if (ret < 0) |
| 199 | return ret; |
| 200 | *keylen = ret; |
| 201 | return 1; |
| 202 | } |
| 203 | |
| 204 | static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| 205 | { |
| 206 | EC_PKEY_CTX *dctx = ctx->data; |
| 207 | EC_GROUP *group; |
| 208 | switch (type) |
| 209 | { |
| 210 | case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: |
| 211 | group = EC_GROUP_new_by_curve_name(p1); |
| 212 | if (group == NULL) |
| 213 | { |
| 214 | ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE); |
| 215 | return 0; |
| 216 | } |
| 217 | if (dctx->gen_group) |
| 218 | EC_GROUP_free(dctx->gen_group); |
| 219 | dctx->gen_group = group; |
| 220 | return 1; |
| 221 | |
| 222 | case EVP_PKEY_CTRL_MD: |
| 223 | if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 224 | EVP_MD_type((const EVP_MD *)p2) != NID_sha224 && |
| 225 | EVP_MD_type((const EVP_MD *)p2) != NID_sha256 && |
| 226 | EVP_MD_type((const EVP_MD *)p2) != NID_sha384 && |
| 227 | EVP_MD_type((const EVP_MD *)p2) != NID_sha512) |
| 228 | { |
| 229 | ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE); |
| 230 | return 0; |
| 231 | } |
| 232 | dctx->md = p2; |
| 233 | return 1; |
| 234 | |
| 235 | case EVP_PKEY_CTRL_PEER_KEY: |
| 236 | /* Default behaviour is OK */ |
| 237 | case EVP_PKEY_CTRL_DIGESTINIT: |
| 238 | case EVP_PKEY_CTRL_PKCS7_SIGN: |
| 239 | case EVP_PKEY_CTRL_CMS_SIGN: |
| 240 | return 1; |
| 241 | |
| 242 | default: |
| 243 | return -2; |
| 244 | |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx, |
| 249 | const char *type, const char *value) |
| 250 | { |
| 251 | if (!strcmp(type, "ec_paramgen_curve")) |
| 252 | { |
| 253 | int nid; |
| 254 | nid = OBJ_sn2nid(value); |
| 255 | if (nid == NID_undef) |
| 256 | nid = OBJ_ln2nid(value); |
| 257 | if (nid == NID_undef) |
| 258 | { |
| 259 | ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE); |
| 260 | return 0; |
| 261 | } |
| 262 | return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid); |
| 263 | } |
| 264 | return -2; |
| 265 | } |
| 266 | |
| 267 | static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 268 | { |
| 269 | EC_KEY *ec = NULL; |
| 270 | EC_PKEY_CTX *dctx = ctx->data; |
| 271 | int ret = 0; |
| 272 | if (dctx->gen_group == NULL) |
| 273 | { |
| 274 | ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET); |
| 275 | return 0; |
| 276 | } |
| 277 | ec = EC_KEY_new(); |
| 278 | if (!ec) |
| 279 | return 0; |
| 280 | ret = EC_KEY_set_group(ec, dctx->gen_group); |
| 281 | if (ret) |
| 282 | EVP_PKEY_assign_EC_KEY(pkey, ec); |
| 283 | else |
| 284 | EC_KEY_free(ec); |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 289 | { |
| 290 | EC_KEY *ec = NULL; |
| 291 | if (ctx->pkey == NULL) |
| 292 | { |
| 293 | ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET); |
| 294 | return 0; |
| 295 | } |
| 296 | ec = EC_KEY_new(); |
| 297 | if (!ec) |
| 298 | return 0; |
| 299 | EVP_PKEY_assign_EC_KEY(pkey, ec); |
| 300 | /* Note: if error return, pkey is freed by parent routine */ |
| 301 | if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) |
| 302 | return 0; |
| 303 | return EC_KEY_generate_key(pkey->pkey.ec); |
| 304 | } |
| 305 | |
| 306 | const EVP_PKEY_METHOD ec_pkey_meth = |
| 307 | { |
| 308 | EVP_PKEY_EC, |
| 309 | 0, |
| 310 | pkey_ec_init, |
| 311 | pkey_ec_copy, |
| 312 | pkey_ec_cleanup, |
| 313 | |
| 314 | 0, |
| 315 | pkey_ec_paramgen, |
| 316 | |
| 317 | 0, |
| 318 | pkey_ec_keygen, |
| 319 | |
| 320 | 0, |
| 321 | pkey_ec_sign, |
| 322 | |
| 323 | 0, |
| 324 | pkey_ec_verify, |
| 325 | |
| 326 | 0,0, |
| 327 | |
| 328 | 0,0,0,0, |
| 329 | |
| 330 | 0,0, |
| 331 | |
| 332 | 0,0, |
| 333 | |
| 334 | 0, |
| 335 | pkey_ec_derive, |
| 336 | |
| 337 | pkey_ec_ctrl, |
| 338 | pkey_ec_ctrl_str |
| 339 | |
| 340 | }; |