yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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 |
| 8 | */ |
| 9 | |
| 10 | #include <stdio.h> |
| 11 | #include "internal/cryptlib.h" |
| 12 | #include <openssl/x509.h> |
| 13 | #include <openssl/ec.h> |
| 14 | #include <openssl/rand.h> |
| 15 | #include "crypto/asn1.h" |
| 16 | #include "crypto/evp.h" |
| 17 | #include "ec_local.h" |
| 18 | #include "curve448/curve448_local.h" |
| 19 | |
| 20 | #define X25519_BITS 253 |
| 21 | #define X25519_SECURITY_BITS 128 |
| 22 | |
| 23 | #define ED25519_SIGSIZE 64 |
| 24 | |
| 25 | #define X448_BITS 448 |
| 26 | #define ED448_BITS 456 |
| 27 | #define X448_SECURITY_BITS 224 |
| 28 | |
| 29 | #define ED448_SIGSIZE 114 |
| 30 | |
| 31 | #define ISX448(id) ((id) == EVP_PKEY_X448) |
| 32 | #define IS25519(id) ((id) == EVP_PKEY_X25519 || (id) == EVP_PKEY_ED25519) |
| 33 | #define KEYLENID(id) (IS25519(id) ? X25519_KEYLEN \ |
| 34 | : ((id) == EVP_PKEY_X448 ? X448_KEYLEN \ |
| 35 | : ED448_KEYLEN)) |
| 36 | #define KEYLEN(p) KEYLENID((p)->ameth->pkey_id) |
| 37 | |
| 38 | |
| 39 | typedef enum { |
| 40 | KEY_OP_PUBLIC, |
| 41 | KEY_OP_PRIVATE, |
| 42 | KEY_OP_KEYGEN |
| 43 | } ecx_key_op_t; |
| 44 | |
| 45 | /* Setup EVP_PKEY using public, private or generation */ |
| 46 | static int ecx_key_op(EVP_PKEY *pkey, int id, const X509_ALGOR *palg, |
| 47 | const unsigned char *p, int plen, ecx_key_op_t op) |
| 48 | { |
| 49 | ECX_KEY *key = NULL; |
| 50 | unsigned char *privkey, *pubkey; |
| 51 | |
| 52 | if (op != KEY_OP_KEYGEN) { |
| 53 | if (palg != NULL) { |
| 54 | int ptype; |
| 55 | |
| 56 | /* Algorithm parameters must be absent */ |
| 57 | X509_ALGOR_get0(NULL, &ptype, NULL, palg); |
| 58 | if (ptype != V_ASN1_UNDEF) { |
| 59 | ECerr(EC_F_ECX_KEY_OP, EC_R_INVALID_ENCODING); |
| 60 | return 0; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | if (p == NULL || plen != KEYLENID(id)) { |
| 65 | ECerr(EC_F_ECX_KEY_OP, EC_R_INVALID_ENCODING); |
| 66 | return 0; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | key = OPENSSL_zalloc(sizeof(*key)); |
| 71 | if (key == NULL) { |
| 72 | ECerr(EC_F_ECX_KEY_OP, ERR_R_MALLOC_FAILURE); |
| 73 | return 0; |
| 74 | } |
| 75 | pubkey = key->pubkey; |
| 76 | |
| 77 | if (op == KEY_OP_PUBLIC) { |
| 78 | memcpy(pubkey, p, plen); |
| 79 | } else { |
| 80 | privkey = key->privkey = OPENSSL_secure_malloc(KEYLENID(id)); |
| 81 | if (privkey == NULL) { |
| 82 | ECerr(EC_F_ECX_KEY_OP, ERR_R_MALLOC_FAILURE); |
| 83 | goto err; |
| 84 | } |
| 85 | if (op == KEY_OP_KEYGEN) { |
| 86 | if (RAND_priv_bytes(privkey, KEYLENID(id)) <= 0) { |
| 87 | OPENSSL_secure_free(privkey); |
| 88 | key->privkey = NULL; |
| 89 | goto err; |
| 90 | } |
| 91 | if (id == EVP_PKEY_X25519) { |
| 92 | privkey[0] &= 248; |
| 93 | privkey[X25519_KEYLEN - 1] &= 127; |
| 94 | privkey[X25519_KEYLEN - 1] |= 64; |
| 95 | } else if (id == EVP_PKEY_X448) { |
| 96 | privkey[0] &= 252; |
| 97 | privkey[X448_KEYLEN - 1] |= 128; |
| 98 | } |
| 99 | } else { |
| 100 | memcpy(privkey, p, KEYLENID(id)); |
| 101 | } |
| 102 | switch (id) { |
| 103 | case EVP_PKEY_X25519: |
| 104 | X25519_public_from_private(pubkey, privkey); |
| 105 | break; |
| 106 | case EVP_PKEY_ED25519: |
| 107 | ED25519_public_from_private(pubkey, privkey); |
| 108 | break; |
| 109 | case EVP_PKEY_X448: |
| 110 | X448_public_from_private(pubkey, privkey); |
| 111 | break; |
| 112 | case EVP_PKEY_ED448: |
| 113 | ED448_public_from_private(pubkey, privkey); |
| 114 | break; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | EVP_PKEY_assign(pkey, id, key); |
| 119 | return 1; |
| 120 | err: |
| 121 | OPENSSL_free(key); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static int ecx_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) |
| 126 | { |
| 127 | const ECX_KEY *ecxkey = pkey->pkey.ecx; |
| 128 | unsigned char *penc; |
| 129 | |
| 130 | if (ecxkey == NULL) { |
| 131 | ECerr(EC_F_ECX_PUB_ENCODE, EC_R_INVALID_KEY); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | penc = OPENSSL_memdup(ecxkey->pubkey, KEYLEN(pkey)); |
| 136 | if (penc == NULL) { |
| 137 | ECerr(EC_F_ECX_PUB_ENCODE, ERR_R_MALLOC_FAILURE); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | if (!X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id), |
| 142 | V_ASN1_UNDEF, NULL, penc, KEYLEN(pkey))) { |
| 143 | OPENSSL_free(penc); |
| 144 | ECerr(EC_F_ECX_PUB_ENCODE, ERR_R_MALLOC_FAILURE); |
| 145 | return 0; |
| 146 | } |
| 147 | return 1; |
| 148 | } |
| 149 | |
| 150 | static int ecx_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) |
| 151 | { |
| 152 | const unsigned char *p; |
| 153 | int pklen; |
| 154 | X509_ALGOR *palg; |
| 155 | |
| 156 | if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) |
| 157 | return 0; |
| 158 | return ecx_key_op(pkey, pkey->ameth->pkey_id, palg, p, pklen, |
| 159 | KEY_OP_PUBLIC); |
| 160 | } |
| 161 | |
| 162 | static int ecx_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
| 163 | { |
| 164 | const ECX_KEY *akey = a->pkey.ecx; |
| 165 | const ECX_KEY *bkey = b->pkey.ecx; |
| 166 | |
| 167 | if (akey == NULL || bkey == NULL) |
| 168 | return -2; |
| 169 | |
| 170 | return CRYPTO_memcmp(akey->pubkey, bkey->pubkey, KEYLEN(a)) == 0; |
| 171 | } |
| 172 | |
| 173 | static int ecx_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) |
| 174 | { |
| 175 | const unsigned char *p; |
| 176 | int plen; |
| 177 | ASN1_OCTET_STRING *oct = NULL; |
| 178 | const X509_ALGOR *palg; |
| 179 | int rv; |
| 180 | |
| 181 | if (!PKCS8_pkey_get0(NULL, &p, &plen, &palg, p8)) |
| 182 | return 0; |
| 183 | |
| 184 | oct = d2i_ASN1_OCTET_STRING(NULL, &p, plen); |
| 185 | if (oct == NULL) { |
| 186 | p = NULL; |
| 187 | plen = 0; |
| 188 | } else { |
| 189 | p = ASN1_STRING_get0_data(oct); |
| 190 | plen = ASN1_STRING_length(oct); |
| 191 | } |
| 192 | |
| 193 | rv = ecx_key_op(pkey, pkey->ameth->pkey_id, palg, p, plen, KEY_OP_PRIVATE); |
| 194 | ASN1_STRING_clear_free(oct); |
| 195 | return rv; |
| 196 | } |
| 197 | |
| 198 | static int ecx_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) |
| 199 | { |
| 200 | const ECX_KEY *ecxkey = pkey->pkey.ecx; |
| 201 | ASN1_OCTET_STRING oct; |
| 202 | unsigned char *penc = NULL; |
| 203 | int penclen; |
| 204 | |
| 205 | if (ecxkey == NULL || ecxkey->privkey == NULL) { |
| 206 | ECerr(EC_F_ECX_PRIV_ENCODE, EC_R_INVALID_PRIVATE_KEY); |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | oct.data = ecxkey->privkey; |
| 211 | oct.length = KEYLEN(pkey); |
| 212 | oct.flags = 0; |
| 213 | |
| 214 | penclen = i2d_ASN1_OCTET_STRING(&oct, &penc); |
| 215 | if (penclen < 0) { |
| 216 | ECerr(EC_F_ECX_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0, |
| 221 | V_ASN1_UNDEF, NULL, penc, penclen)) { |
| 222 | OPENSSL_clear_free(penc, penclen); |
| 223 | ECerr(EC_F_ECX_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | return 1; |
| 228 | } |
| 229 | |
| 230 | static int ecx_size(const EVP_PKEY *pkey) |
| 231 | { |
| 232 | return KEYLEN(pkey); |
| 233 | } |
| 234 | |
| 235 | static int ecx_bits(const EVP_PKEY *pkey) |
| 236 | { |
| 237 | if (IS25519(pkey->ameth->pkey_id)) { |
| 238 | return X25519_BITS; |
| 239 | } else if(ISX448(pkey->ameth->pkey_id)) { |
| 240 | return X448_BITS; |
| 241 | } else { |
| 242 | return ED448_BITS; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | static int ecx_security_bits(const EVP_PKEY *pkey) |
| 247 | { |
| 248 | if (IS25519(pkey->ameth->pkey_id)) { |
| 249 | return X25519_SECURITY_BITS; |
| 250 | } else { |
| 251 | return X448_SECURITY_BITS; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | static void ecx_free(EVP_PKEY *pkey) |
| 256 | { |
| 257 | if (pkey->pkey.ecx != NULL) |
| 258 | OPENSSL_secure_clear_free(pkey->pkey.ecx->privkey, KEYLEN(pkey)); |
| 259 | OPENSSL_free(pkey->pkey.ecx); |
| 260 | } |
| 261 | |
| 262 | /* "parameters" are always equal */ |
| 263 | static int ecx_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) |
| 264 | { |
| 265 | return 1; |
| 266 | } |
| 267 | |
| 268 | static int ecx_key_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| 269 | ASN1_PCTX *ctx, ecx_key_op_t op) |
| 270 | { |
| 271 | const ECX_KEY *ecxkey = pkey->pkey.ecx; |
| 272 | const char *nm = OBJ_nid2ln(pkey->ameth->pkey_id); |
| 273 | |
| 274 | if (op == KEY_OP_PRIVATE) { |
| 275 | if (ecxkey == NULL || ecxkey->privkey == NULL) { |
| 276 | if (BIO_printf(bp, "%*s<INVALID PRIVATE KEY>\n", indent, "") <= 0) |
| 277 | return 0; |
| 278 | return 1; |
| 279 | } |
| 280 | if (BIO_printf(bp, "%*s%s Private-Key:\n", indent, "", nm) <= 0) |
| 281 | return 0; |
| 282 | if (BIO_printf(bp, "%*spriv:\n", indent, "") <= 0) |
| 283 | return 0; |
| 284 | if (ASN1_buf_print(bp, ecxkey->privkey, KEYLEN(pkey), |
| 285 | indent + 4) == 0) |
| 286 | return 0; |
| 287 | } else { |
| 288 | if (ecxkey == NULL) { |
| 289 | if (BIO_printf(bp, "%*s<INVALID PUBLIC KEY>\n", indent, "") <= 0) |
| 290 | return 0; |
| 291 | return 1; |
| 292 | } |
| 293 | if (BIO_printf(bp, "%*s%s Public-Key:\n", indent, "", nm) <= 0) |
| 294 | return 0; |
| 295 | } |
| 296 | if (BIO_printf(bp, "%*spub:\n", indent, "") <= 0) |
| 297 | return 0; |
| 298 | |
| 299 | if (ASN1_buf_print(bp, ecxkey->pubkey, KEYLEN(pkey), |
| 300 | indent + 4) == 0) |
| 301 | return 0; |
| 302 | return 1; |
| 303 | } |
| 304 | |
| 305 | static int ecx_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| 306 | ASN1_PCTX *ctx) |
| 307 | { |
| 308 | return ecx_key_print(bp, pkey, indent, ctx, KEY_OP_PRIVATE); |
| 309 | } |
| 310 | |
| 311 | static int ecx_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| 312 | ASN1_PCTX *ctx) |
| 313 | { |
| 314 | return ecx_key_print(bp, pkey, indent, ctx, KEY_OP_PUBLIC); |
| 315 | } |
| 316 | |
| 317 | static int ecx_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
| 318 | { |
| 319 | switch (op) { |
| 320 | |
| 321 | case ASN1_PKEY_CTRL_SET1_TLS_ENCPT: |
| 322 | return ecx_key_op(pkey, pkey->ameth->pkey_id, NULL, arg2, arg1, |
| 323 | KEY_OP_PUBLIC); |
| 324 | |
| 325 | case ASN1_PKEY_CTRL_GET1_TLS_ENCPT: |
| 326 | if (pkey->pkey.ecx != NULL) { |
| 327 | unsigned char **ppt = arg2; |
| 328 | |
| 329 | *ppt = OPENSSL_memdup(pkey->pkey.ecx->pubkey, KEYLEN(pkey)); |
| 330 | if (*ppt != NULL) |
| 331 | return KEYLEN(pkey); |
| 332 | } |
| 333 | return 0; |
| 334 | |
| 335 | default: |
| 336 | return -2; |
| 337 | |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | static int ecd_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
| 342 | { |
| 343 | switch (op) { |
| 344 | case ASN1_PKEY_CTRL_DEFAULT_MD_NID: |
| 345 | /* We currently only support Pure EdDSA which takes no digest */ |
| 346 | *(int *)arg2 = NID_undef; |
| 347 | return 2; |
| 348 | |
| 349 | default: |
| 350 | return -2; |
| 351 | |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | static int ecx_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv, |
| 356 | size_t len) |
| 357 | { |
| 358 | return ecx_key_op(pkey, pkey->ameth->pkey_id, NULL, priv, len, |
| 359 | KEY_OP_PRIVATE); |
| 360 | } |
| 361 | |
| 362 | static int ecx_set_pub_key(EVP_PKEY *pkey, const unsigned char *pub, size_t len) |
| 363 | { |
| 364 | return ecx_key_op(pkey, pkey->ameth->pkey_id, NULL, pub, len, |
| 365 | KEY_OP_PUBLIC); |
| 366 | } |
| 367 | |
| 368 | static int ecx_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv, |
| 369 | size_t *len) |
| 370 | { |
| 371 | const ECX_KEY *key = pkey->pkey.ecx; |
| 372 | |
| 373 | if (priv == NULL) { |
| 374 | *len = KEYLENID(pkey->ameth->pkey_id); |
| 375 | return 1; |
| 376 | } |
| 377 | |
| 378 | if (key == NULL |
| 379 | || key->privkey == NULL |
| 380 | || *len < (size_t)KEYLENID(pkey->ameth->pkey_id)) |
| 381 | return 0; |
| 382 | |
| 383 | *len = KEYLENID(pkey->ameth->pkey_id); |
| 384 | memcpy(priv, key->privkey, *len); |
| 385 | |
| 386 | return 1; |
| 387 | } |
| 388 | |
| 389 | static int ecx_get_pub_key(const EVP_PKEY *pkey, unsigned char *pub, |
| 390 | size_t *len) |
| 391 | { |
| 392 | const ECX_KEY *key = pkey->pkey.ecx; |
| 393 | |
| 394 | if (pub == NULL) { |
| 395 | *len = KEYLENID(pkey->ameth->pkey_id); |
| 396 | return 1; |
| 397 | } |
| 398 | |
| 399 | if (key == NULL |
| 400 | || *len < (size_t)KEYLENID(pkey->ameth->pkey_id)) |
| 401 | return 0; |
| 402 | |
| 403 | *len = KEYLENID(pkey->ameth->pkey_id); |
| 404 | memcpy(pub, key->pubkey, *len); |
| 405 | |
| 406 | return 1; |
| 407 | } |
| 408 | |
| 409 | const EVP_PKEY_ASN1_METHOD ecx25519_asn1_meth = { |
| 410 | EVP_PKEY_X25519, |
| 411 | EVP_PKEY_X25519, |
| 412 | 0, |
| 413 | "X25519", |
| 414 | "OpenSSL X25519 algorithm", |
| 415 | |
| 416 | ecx_pub_decode, |
| 417 | ecx_pub_encode, |
| 418 | ecx_pub_cmp, |
| 419 | ecx_pub_print, |
| 420 | |
| 421 | ecx_priv_decode, |
| 422 | ecx_priv_encode, |
| 423 | ecx_priv_print, |
| 424 | |
| 425 | ecx_size, |
| 426 | ecx_bits, |
| 427 | ecx_security_bits, |
| 428 | |
| 429 | 0, 0, 0, 0, |
| 430 | ecx_cmp_parameters, |
| 431 | 0, 0, |
| 432 | |
| 433 | ecx_free, |
| 434 | ecx_ctrl, |
| 435 | NULL, |
| 436 | NULL, |
| 437 | |
| 438 | NULL, |
| 439 | NULL, |
| 440 | NULL, |
| 441 | |
| 442 | NULL, |
| 443 | NULL, |
| 444 | NULL, |
| 445 | |
| 446 | ecx_set_priv_key, |
| 447 | ecx_set_pub_key, |
| 448 | ecx_get_priv_key, |
| 449 | ecx_get_pub_key, |
| 450 | }; |
| 451 | |
| 452 | const EVP_PKEY_ASN1_METHOD ecx448_asn1_meth = { |
| 453 | EVP_PKEY_X448, |
| 454 | EVP_PKEY_X448, |
| 455 | 0, |
| 456 | "X448", |
| 457 | "OpenSSL X448 algorithm", |
| 458 | |
| 459 | ecx_pub_decode, |
| 460 | ecx_pub_encode, |
| 461 | ecx_pub_cmp, |
| 462 | ecx_pub_print, |
| 463 | |
| 464 | ecx_priv_decode, |
| 465 | ecx_priv_encode, |
| 466 | ecx_priv_print, |
| 467 | |
| 468 | ecx_size, |
| 469 | ecx_bits, |
| 470 | ecx_security_bits, |
| 471 | |
| 472 | 0, 0, 0, 0, |
| 473 | ecx_cmp_parameters, |
| 474 | 0, 0, |
| 475 | |
| 476 | ecx_free, |
| 477 | ecx_ctrl, |
| 478 | NULL, |
| 479 | NULL, |
| 480 | |
| 481 | NULL, |
| 482 | NULL, |
| 483 | NULL, |
| 484 | |
| 485 | NULL, |
| 486 | NULL, |
| 487 | NULL, |
| 488 | |
| 489 | ecx_set_priv_key, |
| 490 | ecx_set_pub_key, |
| 491 | ecx_get_priv_key, |
| 492 | ecx_get_pub_key, |
| 493 | }; |
| 494 | |
| 495 | static int ecd_size25519(const EVP_PKEY *pkey) |
| 496 | { |
| 497 | return ED25519_SIGSIZE; |
| 498 | } |
| 499 | |
| 500 | static int ecd_size448(const EVP_PKEY *pkey) |
| 501 | { |
| 502 | return ED448_SIGSIZE; |
| 503 | } |
| 504 | |
| 505 | static int ecd_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, |
| 506 | X509_ALGOR *sigalg, ASN1_BIT_STRING *str, |
| 507 | EVP_PKEY *pkey) |
| 508 | { |
| 509 | const ASN1_OBJECT *obj; |
| 510 | int ptype; |
| 511 | int nid; |
| 512 | |
| 513 | /* Sanity check: make sure it is ED25519/ED448 with absent parameters */ |
| 514 | X509_ALGOR_get0(&obj, &ptype, NULL, sigalg); |
| 515 | nid = OBJ_obj2nid(obj); |
| 516 | if ((nid != NID_ED25519 && nid != NID_ED448) || ptype != V_ASN1_UNDEF) { |
| 517 | ECerr(EC_F_ECD_ITEM_VERIFY, EC_R_INVALID_ENCODING); |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | if (!EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, pkey)) |
| 522 | return 0; |
| 523 | |
| 524 | return 2; |
| 525 | } |
| 526 | |
| 527 | static int ecd_item_sign25519(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, |
| 528 | X509_ALGOR *alg1, X509_ALGOR *alg2, |
| 529 | ASN1_BIT_STRING *str) |
| 530 | { |
| 531 | /* Set algorithms identifiers */ |
| 532 | X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL); |
| 533 | if (alg2) |
| 534 | X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL); |
| 535 | /* Algorithm identifiers set: carry on as normal */ |
| 536 | return 3; |
| 537 | } |
| 538 | |
| 539 | static int ecd_sig_info_set25519(X509_SIG_INFO *siginf, const X509_ALGOR *alg, |
| 540 | const ASN1_STRING *sig) |
| 541 | { |
| 542 | X509_SIG_INFO_set(siginf, NID_undef, NID_ED25519, X25519_SECURITY_BITS, |
| 543 | X509_SIG_INFO_TLS); |
| 544 | return 1; |
| 545 | } |
| 546 | |
| 547 | static int ecd_item_sign448(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, |
| 548 | X509_ALGOR *alg1, X509_ALGOR *alg2, |
| 549 | ASN1_BIT_STRING *str) |
| 550 | { |
| 551 | /* Set algorithm identifier */ |
| 552 | X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_ED448), V_ASN1_UNDEF, NULL); |
| 553 | if (alg2 != NULL) |
| 554 | X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_ED448), V_ASN1_UNDEF, NULL); |
| 555 | /* Algorithm identifier set: carry on as normal */ |
| 556 | return 3; |
| 557 | } |
| 558 | |
| 559 | static int ecd_sig_info_set448(X509_SIG_INFO *siginf, const X509_ALGOR *alg, |
| 560 | const ASN1_STRING *sig) |
| 561 | { |
| 562 | X509_SIG_INFO_set(siginf, NID_undef, NID_ED448, X448_SECURITY_BITS, |
| 563 | X509_SIG_INFO_TLS); |
| 564 | return 1; |
| 565 | } |
| 566 | |
| 567 | |
| 568 | const EVP_PKEY_ASN1_METHOD ed25519_asn1_meth = { |
| 569 | EVP_PKEY_ED25519, |
| 570 | EVP_PKEY_ED25519, |
| 571 | 0, |
| 572 | "ED25519", |
| 573 | "OpenSSL ED25519 algorithm", |
| 574 | |
| 575 | ecx_pub_decode, |
| 576 | ecx_pub_encode, |
| 577 | ecx_pub_cmp, |
| 578 | ecx_pub_print, |
| 579 | |
| 580 | ecx_priv_decode, |
| 581 | ecx_priv_encode, |
| 582 | ecx_priv_print, |
| 583 | |
| 584 | ecd_size25519, |
| 585 | ecx_bits, |
| 586 | ecx_security_bits, |
| 587 | |
| 588 | 0, 0, 0, 0, |
| 589 | ecx_cmp_parameters, |
| 590 | 0, 0, |
| 591 | |
| 592 | ecx_free, |
| 593 | ecd_ctrl, |
| 594 | NULL, |
| 595 | NULL, |
| 596 | ecd_item_verify, |
| 597 | ecd_item_sign25519, |
| 598 | ecd_sig_info_set25519, |
| 599 | |
| 600 | NULL, |
| 601 | NULL, |
| 602 | NULL, |
| 603 | |
| 604 | ecx_set_priv_key, |
| 605 | ecx_set_pub_key, |
| 606 | ecx_get_priv_key, |
| 607 | ecx_get_pub_key, |
| 608 | }; |
| 609 | |
| 610 | const EVP_PKEY_ASN1_METHOD ed448_asn1_meth = { |
| 611 | EVP_PKEY_ED448, |
| 612 | EVP_PKEY_ED448, |
| 613 | 0, |
| 614 | "ED448", |
| 615 | "OpenSSL ED448 algorithm", |
| 616 | |
| 617 | ecx_pub_decode, |
| 618 | ecx_pub_encode, |
| 619 | ecx_pub_cmp, |
| 620 | ecx_pub_print, |
| 621 | |
| 622 | ecx_priv_decode, |
| 623 | ecx_priv_encode, |
| 624 | ecx_priv_print, |
| 625 | |
| 626 | ecd_size448, |
| 627 | ecx_bits, |
| 628 | ecx_security_bits, |
| 629 | |
| 630 | 0, 0, 0, 0, |
| 631 | ecx_cmp_parameters, |
| 632 | 0, 0, |
| 633 | |
| 634 | ecx_free, |
| 635 | ecd_ctrl, |
| 636 | NULL, |
| 637 | NULL, |
| 638 | ecd_item_verify, |
| 639 | ecd_item_sign448, |
| 640 | ecd_sig_info_set448, |
| 641 | |
| 642 | NULL, |
| 643 | NULL, |
| 644 | NULL, |
| 645 | |
| 646 | ecx_set_priv_key, |
| 647 | ecx_set_pub_key, |
| 648 | ecx_get_priv_key, |
| 649 | ecx_get_pub_key, |
| 650 | }; |
| 651 | |
| 652 | static int pkey_ecx_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 653 | { |
| 654 | return ecx_key_op(pkey, ctx->pmeth->pkey_id, NULL, NULL, 0, KEY_OP_KEYGEN); |
| 655 | } |
| 656 | |
| 657 | static int validate_ecx_derive(EVP_PKEY_CTX *ctx, unsigned char *key, |
| 658 | size_t *keylen, |
| 659 | const unsigned char **privkey, |
| 660 | const unsigned char **pubkey) |
| 661 | { |
| 662 | const ECX_KEY *ecxkey, *peerkey; |
| 663 | |
| 664 | if (ctx->pkey == NULL || ctx->peerkey == NULL) { |
| 665 | ECerr(EC_F_VALIDATE_ECX_DERIVE, EC_R_KEYS_NOT_SET); |
| 666 | return 0; |
| 667 | } |
| 668 | ecxkey = ctx->pkey->pkey.ecx; |
| 669 | peerkey = ctx->peerkey->pkey.ecx; |
| 670 | if (ecxkey == NULL || ecxkey->privkey == NULL) { |
| 671 | ECerr(EC_F_VALIDATE_ECX_DERIVE, EC_R_INVALID_PRIVATE_KEY); |
| 672 | return 0; |
| 673 | } |
| 674 | if (peerkey == NULL) { |
| 675 | ECerr(EC_F_VALIDATE_ECX_DERIVE, EC_R_INVALID_PEER_KEY); |
| 676 | return 0; |
| 677 | } |
| 678 | *privkey = ecxkey->privkey; |
| 679 | *pubkey = peerkey->pubkey; |
| 680 | |
| 681 | return 1; |
| 682 | } |
| 683 | |
| 684 | static int pkey_ecx_derive25519(EVP_PKEY_CTX *ctx, unsigned char *key, |
| 685 | size_t *keylen) |
| 686 | { |
| 687 | const unsigned char *privkey, *pubkey; |
| 688 | |
| 689 | if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey) |
| 690 | || (key != NULL |
| 691 | && X25519(key, privkey, pubkey) == 0)) |
| 692 | return 0; |
| 693 | *keylen = X25519_KEYLEN; |
| 694 | return 1; |
| 695 | } |
| 696 | |
| 697 | static int pkey_ecx_derive448(EVP_PKEY_CTX *ctx, unsigned char *key, |
| 698 | size_t *keylen) |
| 699 | { |
| 700 | const unsigned char *privkey, *pubkey; |
| 701 | |
| 702 | if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey) |
| 703 | || (key != NULL |
| 704 | && X448(key, privkey, pubkey) == 0)) |
| 705 | return 0; |
| 706 | *keylen = X448_KEYLEN; |
| 707 | return 1; |
| 708 | } |
| 709 | |
| 710 | static int pkey_ecx_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| 711 | { |
| 712 | /* Only need to handle peer key for derivation */ |
| 713 | if (type == EVP_PKEY_CTRL_PEER_KEY) |
| 714 | return 1; |
| 715 | return -2; |
| 716 | } |
| 717 | |
| 718 | const EVP_PKEY_METHOD ecx25519_pkey_meth = { |
| 719 | EVP_PKEY_X25519, |
| 720 | 0, 0, 0, 0, 0, 0, 0, |
| 721 | pkey_ecx_keygen, |
| 722 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 723 | pkey_ecx_derive25519, |
| 724 | pkey_ecx_ctrl, |
| 725 | 0 |
| 726 | }; |
| 727 | |
| 728 | const EVP_PKEY_METHOD ecx448_pkey_meth = { |
| 729 | EVP_PKEY_X448, |
| 730 | 0, 0, 0, 0, 0, 0, 0, |
| 731 | pkey_ecx_keygen, |
| 732 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 733 | pkey_ecx_derive448, |
| 734 | pkey_ecx_ctrl, |
| 735 | 0 |
| 736 | }; |
| 737 | |
| 738 | static int pkey_ecd_digestsign25519(EVP_MD_CTX *ctx, unsigned char *sig, |
| 739 | size_t *siglen, const unsigned char *tbs, |
| 740 | size_t tbslen) |
| 741 | { |
| 742 | const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx; |
| 743 | |
| 744 | if (sig == NULL) { |
| 745 | *siglen = ED25519_SIGSIZE; |
| 746 | return 1; |
| 747 | } |
| 748 | if (*siglen < ED25519_SIGSIZE) { |
| 749 | ECerr(EC_F_PKEY_ECD_DIGESTSIGN25519, EC_R_BUFFER_TOO_SMALL); |
| 750 | return 0; |
| 751 | } |
| 752 | |
| 753 | if (ED25519_sign(sig, tbs, tbslen, edkey->pubkey, edkey->privkey) == 0) |
| 754 | return 0; |
| 755 | *siglen = ED25519_SIGSIZE; |
| 756 | return 1; |
| 757 | } |
| 758 | |
| 759 | static int pkey_ecd_digestsign448(EVP_MD_CTX *ctx, unsigned char *sig, |
| 760 | size_t *siglen, const unsigned char *tbs, |
| 761 | size_t tbslen) |
| 762 | { |
| 763 | const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx; |
| 764 | |
| 765 | if (sig == NULL) { |
| 766 | *siglen = ED448_SIGSIZE; |
| 767 | return 1; |
| 768 | } |
| 769 | if (*siglen < ED448_SIGSIZE) { |
| 770 | ECerr(EC_F_PKEY_ECD_DIGESTSIGN448, EC_R_BUFFER_TOO_SMALL); |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | if (ED448_sign(sig, tbs, tbslen, edkey->pubkey, edkey->privkey, NULL, |
| 775 | 0) == 0) |
| 776 | return 0; |
| 777 | *siglen = ED448_SIGSIZE; |
| 778 | return 1; |
| 779 | } |
| 780 | |
| 781 | static int pkey_ecd_digestverify25519(EVP_MD_CTX *ctx, const unsigned char *sig, |
| 782 | size_t siglen, const unsigned char *tbs, |
| 783 | size_t tbslen) |
| 784 | { |
| 785 | const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx; |
| 786 | |
| 787 | if (siglen != ED25519_SIGSIZE) |
| 788 | return 0; |
| 789 | |
| 790 | return ED25519_verify(tbs, tbslen, sig, edkey->pubkey); |
| 791 | } |
| 792 | |
| 793 | static int pkey_ecd_digestverify448(EVP_MD_CTX *ctx, const unsigned char *sig, |
| 794 | size_t siglen, const unsigned char *tbs, |
| 795 | size_t tbslen) |
| 796 | { |
| 797 | const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx; |
| 798 | |
| 799 | if (siglen != ED448_SIGSIZE) |
| 800 | return 0; |
| 801 | |
| 802 | return ED448_verify(tbs, tbslen, sig, edkey->pubkey, NULL, 0); |
| 803 | } |
| 804 | |
| 805 | static int pkey_ecd_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| 806 | { |
| 807 | switch (type) { |
| 808 | case EVP_PKEY_CTRL_MD: |
| 809 | /* Only NULL allowed as digest */ |
| 810 | if (p2 == NULL || (const EVP_MD *)p2 == EVP_md_null()) |
| 811 | return 1; |
| 812 | ECerr(EC_F_PKEY_ECD_CTRL, EC_R_INVALID_DIGEST_TYPE); |
| 813 | return 0; |
| 814 | |
| 815 | case EVP_PKEY_CTRL_DIGESTINIT: |
| 816 | return 1; |
| 817 | } |
| 818 | return -2; |
| 819 | } |
| 820 | |
| 821 | const EVP_PKEY_METHOD ed25519_pkey_meth = { |
| 822 | EVP_PKEY_ED25519, EVP_PKEY_FLAG_SIGCTX_CUSTOM, |
| 823 | 0, 0, 0, 0, 0, 0, |
| 824 | pkey_ecx_keygen, |
| 825 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 826 | pkey_ecd_ctrl, |
| 827 | 0, |
| 828 | pkey_ecd_digestsign25519, |
| 829 | pkey_ecd_digestverify25519 |
| 830 | }; |
| 831 | |
| 832 | const EVP_PKEY_METHOD ed448_pkey_meth = { |
| 833 | EVP_PKEY_ED448, EVP_PKEY_FLAG_SIGCTX_CUSTOM, |
| 834 | 0, 0, 0, 0, 0, 0, |
| 835 | pkey_ecx_keygen, |
| 836 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 837 | pkey_ecd_ctrl, |
| 838 | 0, |
| 839 | pkey_ecd_digestsign448, |
| 840 | pkey_ecd_digestverify448 |
| 841 | }; |