1/* 2 * Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (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/* 11 * DSA low level APIs are deprecated for public use, but still ok for 12 * internal use. 13 */ 14#include "internal/deprecated.h" 15 16#include <stdio.h> 17#include <openssl/x509.h> 18#include <openssl/asn1.h> 19#include <openssl/bn.h> 20#include <openssl/core_names.h> 21#include <openssl/param_build.h> 22#include "internal/cryptlib.h" 23#include "crypto/asn1.h" 24#include "crypto/dsa.h" 25#include "crypto/evp.h" 26#include "internal/ffc.h" 27#include "dsa_local.h" 28 29static int dsa_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey) 30{ 31 const unsigned char *p, *pm; 32 int pklen, pmlen; 33 int ptype; 34 const void *pval; 35 const ASN1_STRING *pstr; 36 X509_ALGOR *palg; 37 ASN1_INTEGER *public_key = NULL; 38 39 DSA *dsa = NULL; 40 41 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) 42 return 0; 43 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 44 45 if (ptype == V_ASN1_SEQUENCE) { 46 pstr = pval; 47 pm = pstr->data; 48 pmlen = pstr->length; 49 50 if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) { 51 ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR); 52 goto err; 53 } 54 55 } else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF)) { 56 if ((dsa = DSA_new()) == NULL) { 57 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 58 goto err; 59 } 60 } else { 61 ERR_raise(ERR_LIB_DSA, DSA_R_PARAMETER_ENCODING_ERROR); 62 goto err; 63 } 64 65 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) { 66 ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR); 67 goto err; 68 } 69 70 if ((dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) { 71 ERR_raise(ERR_LIB_DSA, DSA_R_BN_DECODE_ERROR); 72 goto err; 73 } 74 75 dsa->dirty_cnt++; 76 ASN1_INTEGER_free(public_key); 77 EVP_PKEY_assign_DSA(pkey, dsa); 78 return 1; 79 80 err: 81 ASN1_INTEGER_free(public_key); 82 DSA_free(dsa); 83 return 0; 84 85} 86 87static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) 88{ 89 DSA *dsa; 90 int ptype; 91 unsigned char *penc = NULL; 92 int penclen; 93 ASN1_STRING *str = NULL; 94 ASN1_INTEGER *pubint = NULL; 95 ASN1_OBJECT *aobj; 96 97 dsa = pkey->pkey.dsa; 98 if (pkey->save_parameters 99 && dsa->params.p != NULL 100 && dsa->params.q != NULL 101 && dsa->params.g != NULL) { 102 str = ASN1_STRING_new(); 103 if (str == NULL) { 104 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 105 goto err; 106 } 107 str->length = i2d_DSAparams(dsa, &str->data); 108 if (str->length <= 0) { 109 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 110 goto err; 111 } 112 ptype = V_ASN1_SEQUENCE; 113 } else 114 ptype = V_ASN1_UNDEF; 115 116 pubint = BN_to_ASN1_INTEGER(dsa->pub_key, NULL); 117 118 if (pubint == NULL) { 119 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 120 goto err; 121 } 122 123 penclen = i2d_ASN1_INTEGER(pubint, &penc); 124 ASN1_INTEGER_free(pubint); 125 126 if (penclen <= 0) { 127 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 128 goto err; 129 } 130 131 aobj = OBJ_nid2obj(EVP_PKEY_DSA); 132 if (aobj == NULL) 133 goto err; 134 135 if (X509_PUBKEY_set0_param(pk, aobj, ptype, str, penc, penclen)) 136 return 1; 137 138 err: 139 OPENSSL_free(penc); 140 ASN1_STRING_free(str); 141 142 return 0; 143} 144 145/* 146 * In PKCS#8 DSA: you just get a private key integer and parameters in the 147 * AlgorithmIdentifier the pubkey must be recalculated. 148 */ 149 150static int dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) 151{ 152 int ret = 0; 153 DSA *dsa = ossl_dsa_key_from_pkcs8(p8, NULL, NULL); 154 155 if (dsa != NULL) { 156 ret = 1; 157 EVP_PKEY_assign_DSA(pkey, dsa); 158 } 159 160 return ret; 161} 162 163static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) 164{ 165 ASN1_STRING *params = NULL; 166 ASN1_INTEGER *prkey = NULL; 167 unsigned char *dp = NULL; 168 int dplen; 169 170 if (pkey->pkey.dsa == NULL|| pkey->pkey.dsa->priv_key == NULL) { 171 ERR_raise(ERR_LIB_DSA, DSA_R_MISSING_PARAMETERS); 172 goto err; 173 } 174 175 params = ASN1_STRING_new(); 176 177 if (params == NULL) { 178 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 179 goto err; 180 } 181 182 params->length = i2d_DSAparams(pkey->pkey.dsa, ¶ms->data); 183 if (params->length <= 0) { 184 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 185 goto err; 186 } 187 params->type = V_ASN1_SEQUENCE; 188 189 /* Get private key into integer */ 190 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL); 191 192 if (prkey == NULL) { 193 ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR); 194 goto err; 195 } 196 197 dplen = i2d_ASN1_INTEGER(prkey, &dp); 198 199 ASN1_STRING_clear_free(prkey); 200 201 if (dplen <= 0) { 202 ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR); 203 goto err; 204 } 205 206 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0, 207 V_ASN1_SEQUENCE, params, dp, dplen)) { 208 OPENSSL_clear_free(dp, dplen); 209 goto err; 210 } 211 return 1; 212 213 err: 214 ASN1_STRING_free(params); 215 return 0; 216} 217 218static int int_dsa_size(const EVP_PKEY *pkey) 219{ 220 return DSA_size(pkey->pkey.dsa); 221} 222 223static int dsa_bits(const EVP_PKEY *pkey) 224{ 225 return DSA_bits(pkey->pkey.dsa); 226} 227 228static int dsa_security_bits(const EVP_PKEY *pkey) 229{ 230 return DSA_security_bits(pkey->pkey.dsa); 231} 232 233static int dsa_missing_parameters(const EVP_PKEY *pkey) 234{ 235 DSA *dsa; 236 dsa = pkey->pkey.dsa; 237 return dsa == NULL 238 || dsa->params.p == NULL 239 || dsa->params.q == NULL 240 || dsa->params.g == NULL; 241} 242 243static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) 244{ 245 if (to->pkey.dsa == NULL) { 246 to->pkey.dsa = DSA_new(); 247 if (to->pkey.dsa == NULL) 248 return 0; 249 } 250 if (!ossl_ffc_params_copy(&to->pkey.dsa->params, &from->pkey.dsa->params)) 251 return 0; 252 253 to->pkey.dsa->dirty_cnt++; 254 return 1; 255} 256 257static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) 258{ 259 return ossl_ffc_params_cmp(&a->pkey.dsa->params, &b->pkey.dsa->params, 1); 260} 261 262static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) 263{ 264 return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0; 265} 266 267static void int_dsa_free(EVP_PKEY *pkey) 268{ 269 DSA_free(pkey->pkey.dsa); 270} 271 272static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype) 273{ 274 int ret = 0; 275 const char *ktype = NULL; 276 const BIGNUM *priv_key, *pub_key; 277 int mod_len = 0; 278 279 if (x->params.p != NULL) 280 mod_len = DSA_bits(x); 281 282 if (ptype == 2) 283 priv_key = x->priv_key; 284 else 285 priv_key = NULL; 286 287 if (ptype > 0) 288 pub_key = x->pub_key; 289 else 290 pub_key = NULL; 291 292 if (ptype == 2) 293 ktype = "Private-Key"; 294 else if (ptype == 1) 295 ktype = "Public-Key"; 296 else 297 ktype = "DSA-Parameters"; 298 299 if (priv_key != NULL) { 300 if (!BIO_indent(bp, off, 128)) 301 goto err; 302 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, mod_len) <= 0) 303 goto err; 304 } else { 305 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0) 306 goto err; 307 } 308 309 if (!ASN1_bn_print(bp, "priv:", priv_key, NULL, off)) 310 goto err; 311 if (!ASN1_bn_print(bp, "pub: ", pub_key, NULL, off)) 312 goto err; 313 if (!ossl_ffc_params_print(bp, &x->params, off)) 314 goto err; 315 ret = 1; 316 err: 317 return ret; 318} 319 320static int dsa_param_decode(EVP_PKEY *pkey, 321 const unsigned char **pder, int derlen) 322{ 323 DSA *dsa; 324 325 if ((dsa = d2i_DSAparams(NULL, pder, derlen)) == NULL) 326 return 0; 327 328 dsa->dirty_cnt++; 329 EVP_PKEY_assign_DSA(pkey, dsa); 330 return 1; 331} 332 333static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder) 334{ 335 return i2d_DSAparams(pkey->pkey.dsa, pder); 336} 337 338static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, 339 ASN1_PCTX *ctx) 340{ 341 return do_dsa_print(bp, pkey->pkey.dsa, indent, 0); 342} 343 344static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, 345 ASN1_PCTX *ctx) 346{ 347 return do_dsa_print(bp, pkey->pkey.dsa, indent, 1); 348} 349 350static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, 351 ASN1_PCTX *ctx) 352{ 353 return do_dsa_print(bp, pkey->pkey.dsa, indent, 2); 354} 355 356static int old_dsa_priv_decode(EVP_PKEY *pkey, 357 const unsigned char **pder, int derlen) 358{ 359 DSA *dsa; 360 361 if ((dsa = d2i_DSAPrivateKey(NULL, pder, derlen)) == NULL) { 362 ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB); 363 return 0; 364 } 365 dsa->dirty_cnt++; 366 EVP_PKEY_assign_DSA(pkey, dsa); 367 return 1; 368} 369 370static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder) 371{ 372 return i2d_DSAPrivateKey(pkey->pkey.dsa, pder); 373} 374 375static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, 376 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) 377{ 378 DSA_SIG *dsa_sig; 379 const unsigned char *p; 380 381 if (sig == NULL) { 382 if (BIO_puts(bp, "\n") <= 0) 383 return 0; 384 else 385 return 1; 386 } 387 p = sig->data; 388 dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length); 389 if (dsa_sig != NULL) { 390 int rv = 0; 391 const BIGNUM *r, *s; 392 393 DSA_SIG_get0(dsa_sig, &r, &s); 394 395 if (BIO_write(bp, "\n", 1) != 1) 396 goto err; 397 398 if (!ASN1_bn_print(bp, "r: ", r, NULL, indent)) 399 goto err; 400 if (!ASN1_bn_print(bp, "s: ", s, NULL, indent)) 401 goto err; 402 rv = 1; 403 err: 404 DSA_SIG_free(dsa_sig); 405 return rv; 406 } 407 if (BIO_puts(bp, "\n") <= 0) 408 return 0; 409 return X509_signature_dump(bp, sig, indent); 410} 411 412static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) 413{ 414 switch (op) { 415 case ASN1_PKEY_CTRL_DEFAULT_MD_NID: 416 *(int *)arg2 = NID_sha256; 417 return 1; 418 419 default: 420 return -2; 421 } 422} 423 424static size_t dsa_pkey_dirty_cnt(const EVP_PKEY *pkey) 425{ 426 return pkey->pkey.dsa->dirty_cnt; 427} 428 429static int dsa_pkey_export_to(const EVP_PKEY *from, void *to_keydata, 430 OSSL_FUNC_keymgmt_import_fn *importer, 431 OSSL_LIB_CTX *libctx, const char *propq) 432{ 433 DSA *dsa = from->pkey.dsa; 434 OSSL_PARAM_BLD *tmpl; 435 const BIGNUM *p = DSA_get0_p(dsa), *g = DSA_get0_g(dsa); 436 const BIGNUM *q = DSA_get0_q(dsa), *pub_key = DSA_get0_pub_key(dsa); 437 const BIGNUM *priv_key = DSA_get0_priv_key(dsa); 438 OSSL_PARAM *params; 439 int selection = 0; 440 int rv = 0; 441 442 if (p == NULL || q == NULL || g == NULL) 443 return 0; 444 445 tmpl = OSSL_PARAM_BLD_new(); 446 if (tmpl == NULL) 447 return 0; 448 449 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p) 450 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q) 451 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g)) 452 goto err; 453 selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS; 454 if (pub_key != NULL) { 455 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, 456 pub_key)) 457 goto err; 458 selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY; 459 } 460 if (priv_key != NULL) { 461 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY, 462 priv_key)) 463 goto err; 464 selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY; 465 } 466 467 if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) 468 goto err; 469 470 /* We export, the provider imports */ 471 rv = importer(to_keydata, selection, params); 472 473 OSSL_PARAM_free(params); 474 err: 475 OSSL_PARAM_BLD_free(tmpl); 476 return rv; 477} 478 479static int dsa_pkey_import_from(const OSSL_PARAM params[], void *vpctx) 480{ 481 EVP_PKEY_CTX *pctx = vpctx; 482 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx); 483 DSA *dsa = ossl_dsa_new(pctx->libctx); 484 485 if (dsa == NULL) { 486 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 487 return 0; 488 } 489 490 if (!ossl_dsa_ffc_params_fromdata(dsa, params) 491 || !ossl_dsa_key_fromdata(dsa, params, 1) 492 || !EVP_PKEY_assign_DSA(pkey, dsa)) { 493 DSA_free(dsa); 494 return 0; 495 } 496 return 1; 497} 498 499static int dsa_pkey_copy(EVP_PKEY *to, EVP_PKEY *from) 500{ 501 DSA *dsa = from->pkey.dsa; 502 DSA *dupkey = NULL; 503 int ret; 504 505 if (dsa != NULL) { 506 dupkey = ossl_dsa_dup(dsa, OSSL_KEYMGMT_SELECT_ALL); 507 if (dupkey == NULL) 508 return 0; 509 } 510 511 ret = EVP_PKEY_assign_DSA(to, dupkey); 512 if (!ret) 513 DSA_free(dupkey); 514 return ret; 515} 516 517/* NB these are sorted in pkey_id order, lowest first */ 518 519const EVP_PKEY_ASN1_METHOD ossl_dsa_asn1_meths[5] = { 520 521 { 522 EVP_PKEY_DSA2, 523 EVP_PKEY_DSA, 524 ASN1_PKEY_ALIAS}, 525 526 { 527 EVP_PKEY_DSA1, 528 EVP_PKEY_DSA, 529 ASN1_PKEY_ALIAS}, 530 531 { 532 EVP_PKEY_DSA4, 533 EVP_PKEY_DSA, 534 ASN1_PKEY_ALIAS}, 535 536 { 537 EVP_PKEY_DSA3, 538 EVP_PKEY_DSA, 539 ASN1_PKEY_ALIAS}, 540 541 { 542 EVP_PKEY_DSA, 543 EVP_PKEY_DSA, 544 0, 545 546 "DSA", 547 "OpenSSL DSA method", 548 549 dsa_pub_decode, 550 dsa_pub_encode, 551 dsa_pub_cmp, 552 dsa_pub_print, 553 554 dsa_priv_decode, 555 dsa_priv_encode, 556 dsa_priv_print, 557 558 int_dsa_size, 559 dsa_bits, 560 dsa_security_bits, 561 562 dsa_param_decode, 563 dsa_param_encode, 564 dsa_missing_parameters, 565 dsa_copy_parameters, 566 dsa_cmp_parameters, 567 dsa_param_print, 568 dsa_sig_print, 569 570 int_dsa_free, 571 dsa_pkey_ctrl, 572 old_dsa_priv_decode, 573 old_dsa_priv_encode, 574 575 NULL, NULL, NULL, 576 NULL, NULL, NULL, 577 NULL, NULL, NULL, NULL, 578 579 dsa_pkey_dirty_cnt, 580 dsa_pkey_export_to, 581 dsa_pkey_import_from, 582 dsa_pkey_copy 583 } 584}; 585