crypto/evp/m_sigver.c

   1 /*
   2  * Copyright 2006-2018 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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/x509.h>
  15 #include "crypto/evp.h"
  16 #include "internal/provider.h"
  17 #include "evp_local.h"
  18
  19 #ifndef FIPS_MODE
  20
  21 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
  22 {
  23     EVPerr(EVP_F_UPDATE, EVP_R_ONLY_ONESHOT_SUPPORTED);
  24     return 0;
  25 }
  26
  27 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  28                           const EVP_MD *type, const char *mdname,
  29                           const char *props, ENGINE *e, EVP_PKEY *pkey,
  30                           int ver)
  31 {
  32     EVP_PKEY_CTX *locpctx = NULL;
  33     EVP_SIGNATURE *signature = NULL;
  34     EVP_KEYMGMT *tmp_keymgmt = NULL;
  35     const char *supported_sig = NULL;
  36     void *provkey = NULL;
  37     int ret;
  38
  39     if (ctx->provctx != NULL) {
  40         if (!ossl_assert(ctx->digest != NULL)) {
  41             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  42             return 0;
  43         }
  44         if (ctx->digest->freectx != NULL)
  45             ctx->digest->freectx(ctx->provctx);
  46         ctx->provctx = NULL;
  47     }
  48
  49     if (ctx->pctx == NULL)
  50         ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  51     if (ctx->pctx == NULL)
  52         return 0;
  53
  54     locpctx = ctx->pctx;
  55     evp_pkey_ctx_free_old_ops(locpctx);
  56
  57     if (locpctx->keytype == NULL)
  58         goto legacy;
  59
  60     if (mdname == NULL) {
  61         if (type != NULL) {
  62             mdname = EVP_MD_name(type);
  63         } else if (pkey != NULL) {
  64             /*
  65              * TODO(v3.0) work out a better way for EVP_PKEYs with no legacy
  66              * component.
  67              */
  68             if (pkey->pkey.ptr != NULL) {
  69                 int def_nid;
  70                 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
  71                     mdname = OBJ_nid2sn(def_nid);
  72             }
  73         }
  74     }
  75
  76     /* Ensure that the key is provided.  If not, go legacy */
  77     tmp_keymgmt = locpctx->keymgmt;
  78     provkey = evp_pkey_make_provided(locpctx->pkey, locpctx->libctx,
  79                                      &tmp_keymgmt, locpctx->propquery, 0);
  80     if (provkey == NULL)
  81         goto legacy;
  82     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
  83         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  84         goto err;
  85     }
  86     EVP_KEYMGMT_free(locpctx->keymgmt);
  87     locpctx->keymgmt = tmp_keymgmt;
  88
  89     if (locpctx->keymgmt->query_operation_name != NULL)
  90         supported_sig =
  91             locpctx->keymgmt->query_operation_name(OSSL_OP_SIGNATURE);
  92
  93     /*
  94      * If we didn't get a supported sig, assume there is one with the
  95      * same name as the key type.
  96      */
  97     if (supported_sig == NULL)
  98         supported_sig = locpctx->keytype;
  99
 100     /*
 101      * Because we cleared out old ops, we shouldn't need to worry about
 102      * checking if signature is already there.
 103      */
 104     signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
 105                                     locpctx->propquery);
 106
 107     if (signature == NULL
 108         || (EVP_KEYMGMT_provider(locpctx->keymgmt)
 109             != EVP_SIGNATURE_provider(signature))) {
 110         /*
 111          * We don't have the full support we need with provided methods,
 112          * let's go see if legacy does.  Also, we don't need to free
 113          * ctx->keymgmt here, as it's not necessarily tied to this
 114          * operation.  It will be freed by EVP_PKEY_CTX_free().
 115          */
 116         EVP_SIGNATURE_free(signature);
 117         goto legacy;
 118     }
 119
 120     /* No more legacy from here down to legacy: */
 121
 122     locpctx->op.sig.signature = signature;
 123     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
 124                              : EVP_PKEY_OP_SIGNCTX;
 125     locpctx->op.sig.sigprovctx
 126         = signature->newctx(ossl_provider_ctx(signature->prov));
 127     if (locpctx->op.sig.sigprovctx == NULL) {
 128         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
 129         goto err;
 130     }
 131     if (type != NULL) {
 132         ctx->reqdigest = type;
 133     } else {
 134         /*
 135          * This might be requested by a later call to EVP_MD_CTX_md(). In that
 136          * case the "explicit fetch" rules apply for that function (as per
 137          * man pages), i.e. the ref count is not updated so the EVP_MD should
 138          * not be used beyound the lifetime of the EVP_MD_CTX.
 139          */
 140         ctx->reqdigest = ctx->fetched_digest =
 141             EVP_MD_fetch(locpctx->libctx, mdname, props);
 142     }
 143
 144     if (ver) {
 145         if (signature->digest_verify_init == NULL) {
 146             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 147             goto err;
 148         }
 149         ret = signature->digest_verify_init(locpctx->op.sig.sigprovctx,
 150                                             mdname, props, provkey);
 151     } else {
 152         if (signature->digest_sign_init == NULL) {
 153             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 154             goto err;
 155         }
 156         ret = signature->digest_sign_init(locpctx->op.sig.sigprovctx,
 157                                           mdname, props, provkey);
 158     }
 159
 160     return ret ? 1 : 0;
 161  err:
 162     evp_pkey_ctx_free_old_ops(locpctx);
 163     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 164     return 0;
 165
 166  legacy:
 167     if (ctx->pctx->pmeth == NULL) {
 168         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 169         return 0;
 170     }
 171
 172     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 173
 174         if (type == NULL) {
 175             int def_nid;
 176             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 177                 type = EVP_get_digestbynid(def_nid);
 178         }
 179
 180         if (type == NULL) {
 181             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
 182             return 0;
 183         }
 184     }
 185
 186     if (ver) {
 187         if (ctx->pctx->pmeth->verifyctx_init) {
 188             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 189                 return 0;
 190             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 191         } else if (ctx->pctx->pmeth->digestverify != 0) {
 192             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 193             ctx->update = update;
 194         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 195             return 0;
 196         }
 197     } else {
 198         if (ctx->pctx->pmeth->signctx_init) {
 199             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 200                 return 0;
 201             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 202         } else if (ctx->pctx->pmeth->digestsign != 0) {
 203             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 204             ctx->update = update;
 205         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 206             return 0;
 207         }
 208     }
 209     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 210         return 0;
 211     if (pctx)
 212         *pctx = ctx->pctx;
 213     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 214         return 1;
 215     if (!EVP_DigestInit_ex(ctx, type, e))
 216         return 0;
 217     /*
 218      * This indicates the current algorithm requires
 219      * special treatment before hashing the tbs-message.
 220      */
 221     if (ctx->pctx->pmeth->digest_custom != NULL)
 222         return ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx);
 223
 224     return 1;
 225 }
 226
 227 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 228                           const char *mdname, const char *props, EVP_PKEY *pkey)
 229 {
 230     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, 0);
 231 }
 232
 233 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 234                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 235 {
 236     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, 0);
 237 }
 238
 239 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 240                             const char *mdname, const char *props,
 241                             EVP_PKEY *pkey)
 242 {
 243     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, 1);
 244 }
 245
 246 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 247                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 248 {
 249     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, 1);
 250 }
 251 #endif /* FIPS_MDOE */
 252
 253 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 254 {
 255     EVP_PKEY_CTX *pctx = ctx->pctx;
 256
 257     if (pctx == NULL
 258             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 259             || pctx->op.sig.sigprovctx == NULL
 260             || pctx->op.sig.signature == NULL)
 261         goto legacy;
 262
 263     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.sigprovctx,
 264                                                       data, dsize);
 265
 266  legacy:
 267     return EVP_DigestUpdate(ctx, data, dsize);
 268 }
 269
 270 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 271 {
 272     EVP_PKEY_CTX *pctx = ctx->pctx;
 273
 274     if (pctx == NULL
 275             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 276             || pctx->op.sig.sigprovctx == NULL
 277             || pctx->op.sig.signature == NULL)
 278         goto legacy;
 279
 280     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.sigprovctx,
 281                                                         data, dsize);
 282
 283  legacy:
 284     return EVP_DigestUpdate(ctx, data, dsize);
 285 }
 286
 287 #ifndef FIPS_MODE
 288 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 289                         size_t *siglen)
 290 {
 291     int sctx = 0, r = 0;
 292     EVP_PKEY_CTX *pctx = ctx->pctx;
 293
 294     if (pctx == NULL
 295             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 296             || pctx->op.sig.sigprovctx == NULL
 297             || pctx->op.sig.signature == NULL)
 298         goto legacy;
 299
 300     return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.sigprovctx,
 301                                                      sigret, siglen, SIZE_MAX);
 302
 303  legacy:
 304     if (pctx == NULL || pctx->pmeth == NULL) {
 305         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 306         return 0;
 307     }
 308
 309     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 310         if (sigret == NULL)
 311             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 312         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 313             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 314         else {
 315             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(pctx);
 316
 317             if (dctx == NULL)
 318                 return 0;
 319             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 320             EVP_PKEY_CTX_free(dctx);
 321         }
 322         return r;
 323     }
 324     if (pctx->pmeth->signctx != NULL)
 325         sctx = 1;
 326     else
 327         sctx = 0;
 328     if (sigret != NULL) {
 329         unsigned char md[EVP_MAX_MD_SIZE];
 330         unsigned int mdlen = 0;
 331
 332         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 333             if (sctx)
 334                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 335             else
 336                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 337         } else {
 338             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 339
 340             if (tmp_ctx == NULL)
 341                 return 0;
 342             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 343                 EVP_MD_CTX_free(tmp_ctx);
 344                 return 0;
 345             }
 346             if (sctx)
 347                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 348                                                   sigret, siglen, tmp_ctx);
 349             else
 350                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 351             EVP_MD_CTX_free(tmp_ctx);
 352         }
 353         if (sctx || !r)
 354             return r;
 355         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
 356             return 0;
 357     } else {
 358         if (sctx) {
 359             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 360                 return 0;
 361         } else {
 362             int s = EVP_MD_size(ctx->digest);
 363
 364             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 365                 return 0;
 366         }
 367     }
 368     return 1;
 369 }
 370
 371 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 372                    const unsigned char *tbs, size_t tbslen)
 373 {
 374     if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
 375         return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 376     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 377         return 0;
 378     return EVP_DigestSignFinal(ctx, sigret, siglen);
 379 }
 380
 381 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 382                           size_t siglen)
 383 {
 384     unsigned char md[EVP_MAX_MD_SIZE];
 385     int r = 0;
 386     unsigned int mdlen = 0;
 387     int vctx = 0;
 388     EVP_PKEY_CTX *pctx = ctx->pctx;
 389
 390     if (pctx == NULL
 391             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 392             || pctx->op.sig.sigprovctx == NULL
 393             || pctx->op.sig.signature == NULL)
 394         goto legacy;
 395
 396     return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.sigprovctx,
 397                                                        sig, siglen);
 398
 399  legacy:
 400     if (pctx == NULL || pctx->pmeth == NULL) {
 401         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 402         return 0;
 403     }
 404
 405     if (pctx->pmeth->verifyctx != NULL)
 406         vctx = 1;
 407     else
 408         vctx = 0;
 409     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 410         if (vctx)
 411             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
 412         else
 413             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 414     } else {
 415         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 416         if (tmp_ctx == NULL)
 417             return -1;
 418         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 419             EVP_MD_CTX_free(tmp_ctx);
 420             return -1;
 421         }
 422         if (vctx)
 423             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 424                                                 sig, siglen, tmp_ctx);
 425         else
 426             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 427         EVP_MD_CTX_free(tmp_ctx);
 428     }
 429     if (vctx || !r)
 430         return r;
 431     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
 432 }
 433
 434 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 435                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 436 {
 437     if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
 438         return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 439     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 440         return -1;
 441     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 442 }
 443 #endif /* FIPS_MODE */