1/* 2 * Copyright 1995-2021 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 <openssl/bn.h> 17#ifndef FIPS_MODULE 18# include <openssl/engine.h> 19#endif 20#include "internal/cryptlib.h" 21#include "internal/refcount.h" 22#include "crypto/dsa.h" 23#include "crypto/dh.h" /* required by DSA_dup_DH() */ 24#include "dsa_local.h" 25 26static DSA *dsa_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx); 27 28#ifndef FIPS_MODULE 29 30int DSA_set_ex_data(DSA *d, int idx, void *arg) 31{ 32 return CRYPTO_set_ex_data(&d->ex_data, idx, arg); 33} 34 35void *DSA_get_ex_data(const DSA *d, int idx) 36{ 37 return CRYPTO_get_ex_data(&d->ex_data, idx); 38} 39 40# ifndef OPENSSL_NO_DH 41DH *DSA_dup_DH(const DSA *r) 42{ 43 /* 44 * DSA has p, q, g, optional pub_key, optional priv_key. 45 * DH has p, optional length, g, optional pub_key, 46 * optional priv_key, optional q. 47 */ 48 DH *ret = NULL; 49 BIGNUM *pub_key = NULL, *priv_key = NULL; 50 51 if (r == NULL) 52 goto err; 53 ret = DH_new(); 54 if (ret == NULL) 55 goto err; 56 57 if (!ossl_ffc_params_copy(ossl_dh_get0_params(ret), &r->params)) 58 goto err; 59 60 if (r->pub_key != NULL) { 61 pub_key = BN_dup(r->pub_key); 62 if (pub_key == NULL) 63 goto err; 64 if (r->priv_key != NULL) { 65 priv_key = BN_dup(r->priv_key); 66 if (priv_key == NULL) 67 goto err; 68 } 69 if (!DH_set0_key(ret, pub_key, priv_key)) 70 goto err; 71 } else if (r->priv_key != NULL) { 72 /* Shouldn't happen */ 73 goto err; 74 } 75 76 return ret; 77 78 err: 79 BN_free(pub_key); 80 BN_free(priv_key); 81 DH_free(ret); 82 return NULL; 83} 84# endif /* OPENSSL_NO_DH */ 85 86void DSA_clear_flags(DSA *d, int flags) 87{ 88 d->flags &= ~flags; 89} 90 91int DSA_test_flags(const DSA *d, int flags) 92{ 93 return d->flags & flags; 94} 95 96void DSA_set_flags(DSA *d, int flags) 97{ 98 d->flags |= flags; 99} 100 101ENGINE *DSA_get0_engine(DSA *d) 102{ 103 return d->engine; 104} 105 106int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 107{ 108 /* 109 * NB: The caller is specifically setting a method, so it's not up to us 110 * to deal with which ENGINE it comes from. 111 */ 112 const DSA_METHOD *mtmp; 113 mtmp = dsa->meth; 114 if (mtmp->finish) 115 mtmp->finish(dsa); 116#ifndef OPENSSL_NO_ENGINE 117 ENGINE_finish(dsa->engine); 118 dsa->engine = NULL; 119#endif 120 dsa->meth = meth; 121 if (meth->init) 122 meth->init(dsa); 123 return 1; 124} 125#endif /* FIPS_MODULE */ 126 127 128const DSA_METHOD *DSA_get_method(DSA *d) 129{ 130 return d->meth; 131} 132 133static DSA *dsa_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx) 134{ 135 DSA *ret = OPENSSL_zalloc(sizeof(*ret)); 136 137 if (ret == NULL) { 138 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 139 return NULL; 140 } 141 142 ret->references = 1; 143 ret->lock = CRYPTO_THREAD_lock_new(); 144 if (ret->lock == NULL) { 145 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); 146 OPENSSL_free(ret); 147 return NULL; 148 } 149 150 ret->libctx = libctx; 151 ret->meth = DSA_get_default_method(); 152#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE) 153 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */ 154 if (engine) { 155 if (!ENGINE_init(engine)) { 156 ERR_raise(ERR_LIB_DSA, ERR_R_ENGINE_LIB); 157 goto err; 158 } 159 ret->engine = engine; 160 } else 161 ret->engine = ENGINE_get_default_DSA(); 162 if (ret->engine) { 163 ret->meth = ENGINE_get_DSA(ret->engine); 164 if (ret->meth == NULL) { 165 ERR_raise(ERR_LIB_DSA, ERR_R_ENGINE_LIB); 166 goto err; 167 } 168 } 169#endif 170 171 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; 172 173#ifndef FIPS_MODULE 174 if (!ossl_crypto_new_ex_data_ex(libctx, CRYPTO_EX_INDEX_DSA, ret, 175 &ret->ex_data)) 176 goto err; 177#endif 178 179 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 180 ERR_raise(ERR_LIB_DSA, ERR_R_INIT_FAIL); 181 goto err; 182 } 183 184 return ret; 185 186 err: 187 DSA_free(ret); 188 return NULL; 189} 190 191DSA *DSA_new_method(ENGINE *engine) 192{ 193 return dsa_new_intern(engine, NULL); 194} 195 196DSA *ossl_dsa_new(OSSL_LIB_CTX *libctx) 197{ 198 return dsa_new_intern(NULL, libctx); 199} 200 201#ifndef FIPS_MODULE 202DSA *DSA_new(void) 203{ 204 return dsa_new_intern(NULL, NULL); 205} 206#endif 207 208void DSA_free(DSA *r) 209{ 210 int i; 211 212 if (r == NULL) 213 return; 214 215 CRYPTO_DOWN_REF(&r->references, &i, r->lock); 216 REF_PRINT_COUNT("DSA", r); 217 if (i > 0) 218 return; 219 REF_ASSERT_ISNT(i < 0); 220 221 if (r->meth != NULL && r->meth->finish != NULL) 222 r->meth->finish(r); 223#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE) 224 ENGINE_finish(r->engine); 225#endif 226 227#ifndef FIPS_MODULE 228 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 229#endif 230 231 CRYPTO_THREAD_lock_free(r->lock); 232 233 ossl_ffc_params_cleanup(&r->params); 234 BN_clear_free(r->pub_key); 235 BN_clear_free(r->priv_key); 236 OPENSSL_free(r); 237} 238 239int DSA_up_ref(DSA *r) 240{ 241 int i; 242 243 if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0) 244 return 0; 245 246 REF_PRINT_COUNT("DSA", r); 247 REF_ASSERT_ISNT(i < 2); 248 return ((i > 1) ? 1 : 0); 249} 250 251void ossl_dsa_set0_libctx(DSA *d, OSSL_LIB_CTX *libctx) 252{ 253 d->libctx = libctx; 254} 255 256void DSA_get0_pqg(const DSA *d, 257 const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) 258{ 259 ossl_ffc_params_get0_pqg(&d->params, p, q, g); 260} 261 262int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g) 263{ 264 /* If the fields p, q and g in d are NULL, the corresponding input 265 * parameters MUST be non-NULL. 266 */ 267 if ((d->params.p == NULL && p == NULL) 268 || (d->params.q == NULL && q == NULL) 269 || (d->params.g == NULL && g == NULL)) 270 return 0; 271 272 ossl_ffc_params_set0_pqg(&d->params, p, q, g); 273 d->dirty_cnt++; 274 275 return 1; 276} 277 278const BIGNUM *DSA_get0_p(const DSA *d) 279{ 280 return d->params.p; 281} 282 283const BIGNUM *DSA_get0_q(const DSA *d) 284{ 285 return d->params.q; 286} 287 288const BIGNUM *DSA_get0_g(const DSA *d) 289{ 290 return d->params.g; 291} 292 293const BIGNUM *DSA_get0_pub_key(const DSA *d) 294{ 295 return d->pub_key; 296} 297 298const BIGNUM *DSA_get0_priv_key(const DSA *d) 299{ 300 return d->priv_key; 301} 302 303void DSA_get0_key(const DSA *d, 304 const BIGNUM **pub_key, const BIGNUM **priv_key) 305{ 306 if (pub_key != NULL) 307 *pub_key = d->pub_key; 308 if (priv_key != NULL) 309 *priv_key = d->priv_key; 310} 311 312int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key) 313{ 314 if (pub_key != NULL) { 315 BN_free(d->pub_key); 316 d->pub_key = pub_key; 317 } 318 if (priv_key != NULL) { 319 BN_free(d->priv_key); 320 d->priv_key = priv_key; 321 } 322 d->dirty_cnt++; 323 324 return 1; 325} 326 327int DSA_security_bits(const DSA *d) 328{ 329 if (d->params.p != NULL && d->params.q != NULL) 330 return BN_security_bits(BN_num_bits(d->params.p), 331 BN_num_bits(d->params.q)); 332 return -1; 333} 334 335int DSA_bits(const DSA *dsa) 336{ 337 if (dsa->params.p != NULL) 338 return BN_num_bits(dsa->params.p); 339 return -1; 340} 341 342FFC_PARAMS *ossl_dsa_get0_params(DSA *dsa) 343{ 344 return &dsa->params; 345} 346 347int ossl_dsa_ffc_params_fromdata(DSA *dsa, const OSSL_PARAM params[]) 348{ 349 int ret; 350 FFC_PARAMS *ffc; 351 352 if (dsa == NULL) 353 return 0; 354 ffc = ossl_dsa_get0_params(dsa); 355 if (ffc == NULL) 356 return 0; 357 358 ret = ossl_ffc_params_fromdata(ffc, params); 359 if (ret) 360 dsa->dirty_cnt++; 361 return ret; 362} 363