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                           EVP_SIGNATURE *signature, int ver)
  31 {
  32     EVP_PKEY_CTX *locpctx = NULL;
  33     void *provkey = NULL;
  34     int ret;
  35
  36     if (ctx->provctx != NULL) {
  37         if (!ossl_assert(ctx->digest != NULL)) {
  38             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  39             return 0;
  40         }
  41         if (ctx->digest->freectx != NULL)
  42             ctx->digest->freectx(ctx->provctx);
  43         ctx->provctx = NULL;
  44     }
  45
  46     if (ctx->pctx == NULL) {
  47         ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  48         if (ctx->pctx == NULL)
  49             return 0;
  50     } else if (pkey != NULL) {
  51         if (!EVP_PKEY_up_ref(pkey))
  52             return 0;
  53         EVP_PKEY_free(ctx->pctx->pkey);
  54         ctx->pctx->pkey = pkey;
  55     }
  56     locpctx = ctx->pctx;
  57     evp_pkey_ctx_free_old_ops(locpctx);
  58     if (locpctx->pkey == NULL)
  59         goto legacy;
  60
  61     if (e != NULL || locpctx->engine != NULL)
  62         goto legacy;
  63
  64     if (signature != NULL) {
  65         if (!EVP_SIGNATURE_up_ref(signature))
  66             goto err;
  67     } else {
  68         /*
  69          * TODO(3.0): Check for legacy handling. Remove this once all all
  70          * algorithms are moved to providers.
  71          */
  72         switch (locpctx->pkey->type) {
  73         case NID_dsa:
  74             break;
  75         default:
  76             goto legacy;
  77         }
  78         signature
  79             = EVP_SIGNATURE_fetch(NULL, OBJ_nid2sn(locpctx->pkey->type), NULL);
  80
  81         if (signature == NULL) {
  82             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  83             goto err;
  84         }
  85     }
  86     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
  87                              : EVP_PKEY_OP_SIGNCTX;
  88
  89     locpctx->op.sig.signature = signature;
  90
  91     locpctx->op.sig.sigprovctx
  92         = signature->newctx(ossl_provider_ctx(signature->prov));
  93     if (locpctx->op.sig.sigprovctx == NULL) {
  94         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
  95         goto err;
  96     }
  97     provkey =
  98         evp_keymgmt_export_to_provider(locpctx->pkey, signature->keymgmt, 0);
  99     if (provkey == NULL) {
 100         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 101         goto err;
 102     }
 103
 104     if (mdname == NULL) {
 105         mdname = EVP_MD_name(type);
 106         ctx->reqdigest = type;
 107     } else {
 108         /*
 109          * This might be requested by a later call to EVP_MD_CTX_md(). In that
 110          * case the "explicit fetch" rules apply for that function (as per
 111          * man pages), i.e. the ref count is not updated so the EVP_MD should
 112          * not be used beyound the lifetime of the EVP_MD_CTX.
 113          */
 114         ctx->reqdigest
 115             = ctx->fetched_digest
 116             = EVP_MD_fetch(
 117                 ossl_provider_library_context(EVP_SIGNATURE_provider(signature)),
 118                 mdname, props);
 119     }
 120
 121     if (ver) {
 122         if (signature->digest_verify_init == NULL) {
 123             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 124             goto err;
 125         }
 126         ret = signature->digest_verify_init(locpctx->op.sig.sigprovctx, mdname,
 127                                             props, provkey);
 128     } else {
 129         if (signature->digest_sign_init == NULL) {
 130             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 131             goto err;
 132         }
 133         ret = signature->digest_sign_init(locpctx->op.sig.sigprovctx, mdname,
 134                                           props, provkey);
 135     }
 136
 137     return ret ? 1 : 0;
 138  err:
 139     evp_pkey_ctx_free_old_ops(locpctx);
 140     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 141     return 0;
 142
 143  legacy:
 144     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 145
 146         if (type == NULL) {
 147             int def_nid;
 148             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 149                 type = EVP_get_digestbynid(def_nid);
 150         }
 151
 152         if (type == NULL) {
 153             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
 154             return 0;
 155         }
 156     }
 157
 158     if (ver) {
 159         if (ctx->pctx->pmeth->verifyctx_init) {
 160             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 161                 return 0;
 162             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 163         } else if (ctx->pctx->pmeth->digestverify != 0) {
 164             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 165             ctx->update = update;
 166         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 167             return 0;
 168         }
 169     } else {
 170         if (ctx->pctx->pmeth->signctx_init) {
 171             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 172                 return 0;
 173             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 174         } else if (ctx->pctx->pmeth->digestsign != 0) {
 175             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 176             ctx->update = update;
 177         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 178             return 0;
 179         }
 180     }
 181     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 182         return 0;
 183     if (pctx)
 184         *pctx = ctx->pctx;
 185     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 186         return 1;
 187     if (!EVP_DigestInit_ex(ctx, type, e))
 188         return 0;
 189     /*
 190      * This indicates the current algorithm requires
 191      * special treatment before hashing the tbs-message.
 192      */
 193     if (ctx->pctx->pmeth->digest_custom != NULL)
 194         return ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx);
 195
 196     return 1;
 197 }
 198
 199 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 200                           const char *mdname, const char *props, EVP_PKEY *pkey,
 201                           EVP_SIGNATURE *signature)
 202 {
 203     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, signature,
 204                           0);
 205 }
 206
 207 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 208                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 209 {
 210     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, NULL, 0);
 211 }
 212
 213 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 214                             const char *mdname, const char *props,
 215                             EVP_PKEY *pkey, EVP_SIGNATURE *signature)
 216 {
 217     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, signature,
 218                           1);
 219 }
 220
 221 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 222                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 223 {
 224     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, NULL, 1);
 225 }
 226 #endif /* FIPS_MDOE */
 227
 228 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 229 {
 230     EVP_PKEY_CTX *pctx = ctx->pctx;
 231
 232     if (pctx == NULL
 233             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 234             || pctx->op.sig.sigprovctx == NULL
 235             || pctx->op.sig.signature == NULL)
 236         goto legacy;
 237
 238     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.sigprovctx,
 239                                                       data, dsize);
 240
 241  legacy:
 242     return EVP_DigestUpdate(ctx, data, dsize);
 243 }
 244
 245 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 246 {
 247     EVP_PKEY_CTX *pctx = ctx->pctx;
 248
 249     if (pctx == NULL
 250             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 251             || pctx->op.sig.sigprovctx == NULL
 252             || pctx->op.sig.signature == NULL)
 253         goto legacy;
 254
 255     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.sigprovctx,
 256                                                         data, dsize);
 257
 258  legacy:
 259     return EVP_DigestUpdate(ctx, data, dsize);
 260 }
 261
 262 #ifndef FIPS_MODE
 263 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 264                         size_t *siglen)
 265 {
 266     int sctx = 0, r = 0;
 267     EVP_PKEY_CTX *pctx = ctx->pctx;
 268
 269     if (pctx == NULL
 270             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 271             || pctx->op.sig.sigprovctx == NULL
 272             || pctx->op.sig.signature == NULL)
 273         goto legacy;
 274
 275     return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.sigprovctx,
 276                                                      sigret, siglen, SIZE_MAX);
 277
 278  legacy:
 279     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 280         if (!sigret)
 281             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 282         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 283             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 284         else {
 285             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(ctx->pctx);
 286             if (!dctx)
 287                 return 0;
 288             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 289             EVP_PKEY_CTX_free(dctx);
 290         }
 291         return r;
 292     }
 293     if (pctx->pmeth->signctx)
 294         sctx = 1;
 295     else
 296         sctx = 0;
 297     if (sigret) {
 298         unsigned char md[EVP_MAX_MD_SIZE];
 299         unsigned int mdlen = 0;
 300         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 301             if (sctx)
 302                 r = ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx);
 303             else
 304                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 305         } else {
 306             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 307             if (tmp_ctx == NULL)
 308                 return 0;
 309             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 310                 EVP_MD_CTX_free(tmp_ctx);
 311                 return 0;
 312             }
 313             if (sctx)
 314                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 315                                                   sigret, siglen, tmp_ctx);
 316             else
 317                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 318             EVP_MD_CTX_free(tmp_ctx);
 319         }
 320         if (sctx || !r)
 321             return r;
 322         if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
 323             return 0;
 324     } else {
 325         if (sctx) {
 326             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 327                 return 0;
 328         } else {
 329             int s = EVP_MD_size(ctx->digest);
 330             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 331                 return 0;
 332         }
 333     }
 334     return 1;
 335 }
 336
 337 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 338                    const unsigned char *tbs, size_t tbslen)
 339 {
 340     if (ctx->pctx->pmeth->digestsign != NULL)
 341         return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 342     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 343         return 0;
 344     return EVP_DigestSignFinal(ctx, sigret, siglen);
 345 }
 346
 347 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 348                           size_t siglen)
 349 {
 350     unsigned char md[EVP_MAX_MD_SIZE];
 351     int r = 0;
 352     unsigned int mdlen = 0;
 353     int vctx = 0;
 354     EVP_PKEY_CTX *pctx = ctx->pctx;
 355
 356     if (pctx == NULL
 357             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 358             || pctx->op.sig.sigprovctx == NULL
 359             || pctx->op.sig.signature == NULL)
 360         goto legacy;
 361
 362     return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.sigprovctx,
 363                                                        sig, siglen);
 364
 365  legacy:
 366     if (ctx->pctx->pmeth->verifyctx)
 367         vctx = 1;
 368     else
 369         vctx = 0;
 370     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 371         if (vctx)
 372             r = ctx->pctx->pmeth->verifyctx(ctx->pctx, sig, siglen, ctx);
 373         else
 374             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 375     } else {
 376         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 377         if (tmp_ctx == NULL)
 378             return -1;
 379         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 380             EVP_MD_CTX_free(tmp_ctx);
 381             return -1;
 382         }
 383         if (vctx)
 384             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 385                                                 sig, siglen, tmp_ctx);
 386         else
 387             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 388         EVP_MD_CTX_free(tmp_ctx);
 389     }
 390     if (vctx || !r)
 391         return r;
 392     return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 393 }
 394
 395 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 396                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 397 {
 398     if (ctx->pctx->pmeth->digestverify != NULL)
 399         return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 400     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 401         return -1;
 402     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 403 }
 404 #endif /* FIPS_MODE */