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 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include <openssl/objects.h>
14 #include "crypto/evp.h"
15 #include "internal/provider.h"
16 #include "internal/numbers.h"   /* includes SIZE_MAX */
17 #include "evp_local.h"
18 
19 #ifndef FIPS_MODULE
20 
update(EVP_MD_CTX * ctx,const void * data,size_t datalen)21 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
22 {
23     ERR_raise(ERR_LIB_EVP, EVP_R_ONLY_ONESHOT_SUPPORTED);
24     return 0;
25 }
26 
27 /*
28  * If we get the "NULL" md then the name comes back as "UNDEF". We want to use
29  * NULL for this.
30  */
canon_mdname(const char * mdname)31 static const char *canon_mdname(const char *mdname)
32 {
33     if (mdname != NULL && strcmp(mdname, "UNDEF") == 0)
34         return NULL;
35 
36     return mdname;
37 }
38 
do_sigver_init(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,const char * mdname,OSSL_LIB_CTX * libctx,const char * props,ENGINE * e,EVP_PKEY * pkey,int ver,const OSSL_PARAM params[])39 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
40                           const EVP_MD *type, const char *mdname,
41                           OSSL_LIB_CTX *libctx, const char *props,
42                           ENGINE *e, EVP_PKEY *pkey, int ver,
43                           const OSSL_PARAM params[])
44 {
45     EVP_PKEY_CTX *locpctx = NULL;
46     EVP_SIGNATURE *signature = NULL;
47     EVP_KEYMGMT *tmp_keymgmt = NULL;
48     const OSSL_PROVIDER *tmp_prov = NULL;
49     const char *supported_sig = NULL;
50     char locmdname[80] = "";     /* 80 chars should be enough */
51     void *provkey = NULL;
52     int ret, iter, reinit = 1;
53 
54     if (ctx->algctx != NULL) {
55         if (!ossl_assert(ctx->digest != NULL)) {
56             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
57             return 0;
58         }
59         if (ctx->digest->freectx != NULL)
60             ctx->digest->freectx(ctx->algctx);
61         ctx->algctx = NULL;
62     }
63 
64     if (ctx->pctx == NULL) {
65         reinit = 0;
66         if (e == NULL)
67             ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props);
68         else
69             ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
70     }
71     if (ctx->pctx == NULL)
72         return 0;
73 
74     locpctx = ctx->pctx;
75     ERR_set_mark();
76 
77     if (evp_pkey_ctx_is_legacy(locpctx))
78         goto legacy;
79 
80     /* do not reinitialize if pkey is set or operation is different */
81     if (reinit
82         && (pkey != NULL
83             || locpctx->operation != (ver ? EVP_PKEY_OP_VERIFYCTX
84                                           : EVP_PKEY_OP_SIGNCTX)
85             || (signature = locpctx->op.sig.signature) == NULL
86             || locpctx->op.sig.algctx == NULL))
87         reinit = 0;
88 
89     if (props == NULL)
90         props = locpctx->propquery;
91 
92     if (locpctx->pkey == NULL) {
93         ERR_clear_last_mark();
94         ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
95         goto err;
96     }
97 
98     if (!reinit) {
99         evp_pkey_ctx_free_old_ops(locpctx);
100     } else {
101         if (mdname == NULL && type == NULL)
102             mdname = canon_mdname(EVP_MD_get0_name(ctx->reqdigest));
103         goto reinitialize;
104     }
105 
106     /*
107      * Try to derive the supported signature from |locpctx->keymgmt|.
108      */
109     if (!ossl_assert(locpctx->pkey->keymgmt == NULL
110                      || locpctx->pkey->keymgmt == locpctx->keymgmt)) {
111         ERR_clear_last_mark();
112         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
113         goto err;
114     }
115     supported_sig = evp_keymgmt_util_query_operation_name(locpctx->keymgmt,
116                                                           OSSL_OP_SIGNATURE);
117     if (supported_sig == NULL) {
118         ERR_clear_last_mark();
119         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
120         goto err;
121     }
122 
123     /*
124      * We perform two iterations:
125      *
126      * 1.  Do the normal signature fetch, using the fetching data given by
127      *     the EVP_PKEY_CTX.
128      * 2.  Do the provider specific signature fetch, from the same provider
129      *     as |ctx->keymgmt|
130      *
131      * We then try to fetch the keymgmt from the same provider as the
132      * signature, and try to export |ctx->pkey| to that keymgmt (when
133      * this keymgmt happens to be the same as |ctx->keymgmt|, the export
134      * is a no-op, but we call it anyway to not complicate the code even
135      * more).
136      * If the export call succeeds (returns a non-NULL provider key pointer),
137      * we're done and can perform the operation itself.  If not, we perform
138      * the second iteration, or jump to legacy.
139      */
140     for (iter = 1, provkey = NULL; iter < 3 && provkey == NULL; iter++) {
141         EVP_KEYMGMT *tmp_keymgmt_tofree = NULL;
142 
143         /*
144          * If we're on the second iteration, free the results from the first.
145          * They are NULL on the first iteration, so no need to check what
146          * iteration we're on.
147          */
148         EVP_SIGNATURE_free(signature);
149         EVP_KEYMGMT_free(tmp_keymgmt);
150 
151         switch (iter) {
152         case 1:
153             signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
154                                             locpctx->propquery);
155             if (signature != NULL)
156                 tmp_prov = EVP_SIGNATURE_get0_provider(signature);
157             break;
158         case 2:
159             tmp_prov = EVP_KEYMGMT_get0_provider(locpctx->keymgmt);
160             signature =
161                 evp_signature_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
162                                               supported_sig, locpctx->propquery);
163             if (signature == NULL)
164                 goto legacy;
165             break;
166         }
167         if (signature == NULL)
168             continue;
169 
170         /*
171          * Ensure that the key is provided, either natively, or as a cached
172          * export.  We start by fetching the keymgmt with the same name as
173          * |locpctx->pkey|, but from the provider of the signature method, using
174          * the same property query as when fetching the signature method.
175          * With the keymgmt we found (if we did), we try to export |locpctx->pkey|
176          * to it (evp_pkey_export_to_provider() is smart enough to only actually
177 
178          * export it if |tmp_keymgmt| is different from |locpctx->pkey|'s keymgmt)
179          */
180         tmp_keymgmt_tofree = tmp_keymgmt =
181             evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
182                                         EVP_KEYMGMT_get0_name(locpctx->keymgmt),
183                                         locpctx->propquery);
184         if (tmp_keymgmt != NULL)
185             provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
186                                                   &tmp_keymgmt, locpctx->propquery);
187         if (tmp_keymgmt == NULL)
188             EVP_KEYMGMT_free(tmp_keymgmt_tofree);
189     }
190 
191     if (provkey == NULL) {
192         EVP_SIGNATURE_free(signature);
193         ERR_clear_last_mark();
194         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
195         goto err;
196     }
197 
198     ERR_pop_to_mark();
199 
200     /* No more legacy from here down to legacy: */
201 
202     locpctx->op.sig.signature = signature;
203     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
204                              : EVP_PKEY_OP_SIGNCTX;
205     locpctx->op.sig.algctx
206         = signature->newctx(ossl_provider_ctx(signature->prov), props);
207     if (locpctx->op.sig.algctx == NULL) {
208         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
209         goto err;
210     }
211 
212  reinitialize:
213     if (pctx != NULL)
214         *pctx = locpctx;
215 
216     if (type != NULL) {
217         ctx->reqdigest = type;
218         if (mdname == NULL)
219             mdname = canon_mdname(EVP_MD_get0_name(type));
220     } else {
221         if (mdname == NULL && !reinit) {
222             if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
223                                                        locmdname,
224                                                        sizeof(locmdname)) > 0) {
225                 mdname = canon_mdname(locmdname);
226             }
227         }
228 
229         if (mdname != NULL) {
230             /*
231              * We're about to get a new digest so clear anything associated with
232              * an old digest.
233              */
234             evp_md_ctx_clear_digest(ctx, 1, 0);
235 
236             /* legacy code support for engines */
237             ERR_set_mark();
238             /*
239              * This might be requested by a later call to EVP_MD_CTX_get0_md().
240              * In that case the "explicit fetch" rules apply for that
241              * function (as per man pages), i.e. the ref count is not updated
242              * so the EVP_MD should not be used beyound the lifetime of the
243              * EVP_MD_CTX.
244              */
245             ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props);
246             if (ctx->fetched_digest != NULL) {
247                 ctx->digest = ctx->reqdigest = ctx->fetched_digest;
248             } else {
249                 /* legacy engine support : remove the mark when this is deleted */
250                 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname);
251                 if (ctx->digest == NULL) {
252                     (void)ERR_clear_last_mark();
253                     ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
254                     goto err;
255                 }
256             }
257             (void)ERR_pop_to_mark();
258         }
259     }
260 
261     if (ver) {
262         if (signature->digest_verify_init == NULL) {
263             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
264             goto err;
265         }
266         ret = signature->digest_verify_init(locpctx->op.sig.algctx,
267                                             mdname, provkey, params);
268     } else {
269         if (signature->digest_sign_init == NULL) {
270             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
271             goto err;
272         }
273         ret = signature->digest_sign_init(locpctx->op.sig.algctx,
274                                           mdname, provkey, params);
275     }
276 
277     /*
278      * If the operation was not a success and no digest was found, an error
279      * needs to be raised.
280      */
281     if (ret > 0 || mdname != NULL)
282         goto end;
283     if (type == NULL)   /* This check is redundant but clarifies matters */
284         ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
285 
286  err:
287     evp_pkey_ctx_free_old_ops(locpctx);
288     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
289     EVP_KEYMGMT_free(tmp_keymgmt);
290     return 0;
291 
292  legacy:
293     /*
294      * If we don't have the full support we need with provided methods,
295      * let's go see if legacy does.
296      */
297     ERR_pop_to_mark();
298     EVP_KEYMGMT_free(tmp_keymgmt);
299     tmp_keymgmt = NULL;
300 
301     if (type == NULL && mdname != NULL)
302         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
303 
304     if (ctx->pctx->pmeth == NULL) {
305         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
306         return 0;
307     }
308 
309     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
310 
311         if (type == NULL) {
312             int def_nid;
313             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
314                 type = EVP_get_digestbynid(def_nid);
315         }
316 
317         if (type == NULL) {
318             ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
319             return 0;
320         }
321     }
322 
323     if (ver) {
324         if (ctx->pctx->pmeth->verifyctx_init) {
325             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
326                 return 0;
327             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
328         } else if (ctx->pctx->pmeth->digestverify != 0) {
329             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
330             ctx->update = update;
331         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
332             return 0;
333         }
334     } else {
335         if (ctx->pctx->pmeth->signctx_init) {
336             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
337                 return 0;
338             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
339         } else if (ctx->pctx->pmeth->digestsign != 0) {
340             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
341             ctx->update = update;
342         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
343             return 0;
344         }
345     }
346     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
347         return 0;
348     if (pctx)
349         *pctx = ctx->pctx;
350     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
351         return 1;
352     if (!EVP_DigestInit_ex(ctx, type, e))
353         return 0;
354     /*
355      * This indicates the current algorithm requires
356      * special treatment before hashing the tbs-message.
357      */
358     ctx->pctx->flag_call_digest_custom = 0;
359     if (ctx->pctx->pmeth->digest_custom != NULL)
360         ctx->pctx->flag_call_digest_custom = 1;
361 
362     ret = 1;
363 
364  end:
365 #ifndef FIPS_MODULE
366     if (ret > 0)
367         ret = evp_pkey_ctx_use_cached_data(locpctx);
368 #endif
369 
370     EVP_KEYMGMT_free(tmp_keymgmt);
371     return ret > 0 ? 1 : 0;
372 }
373 
EVP_DigestSignInit_ex(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const char * mdname,OSSL_LIB_CTX * libctx,const char * props,EVP_PKEY * pkey,const OSSL_PARAM params[])374 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
375                           const char *mdname, OSSL_LIB_CTX *libctx,
376                           const char *props, EVP_PKEY *pkey,
377                           const OSSL_PARAM params[])
378 {
379     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0,
380                           params);
381 }
382 
EVP_DigestSignInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)383 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
384                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
385 {
386     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0,
387                           NULL);
388 }
389 
EVP_DigestVerifyInit_ex(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const char * mdname,OSSL_LIB_CTX * libctx,const char * props,EVP_PKEY * pkey,const OSSL_PARAM params[])390 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
391                             const char *mdname, OSSL_LIB_CTX *libctx,
392                             const char *props, EVP_PKEY *pkey,
393                             const OSSL_PARAM params[])
394 {
395     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1,
396                           params);
397 }
398 
EVP_DigestVerifyInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)399 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
400                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
401 {
402     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1,
403                           NULL);
404 }
405 #endif /* FIPS_MDOE */
406 
EVP_DigestSignUpdate(EVP_MD_CTX * ctx,const void * data,size_t dsize)407 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
408 {
409     EVP_PKEY_CTX *pctx = ctx->pctx;
410 
411     if (pctx == NULL
412             || pctx->operation != EVP_PKEY_OP_SIGNCTX
413             || pctx->op.sig.algctx == NULL
414             || pctx->op.sig.signature == NULL)
415         goto legacy;
416 
417     if (pctx->op.sig.signature->digest_sign_update == NULL) {
418         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
419         return 0;
420     }
421 
422     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.algctx,
423                                                       data, dsize);
424 
425  legacy:
426     if (pctx != NULL) {
427         /* do_sigver_init() checked that |digest_custom| is non-NULL */
428         if (pctx->flag_call_digest_custom
429             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
430             return 0;
431         pctx->flag_call_digest_custom = 0;
432     }
433 
434     return EVP_DigestUpdate(ctx, data, dsize);
435 }
436 
EVP_DigestVerifyUpdate(EVP_MD_CTX * ctx,const void * data,size_t dsize)437 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
438 {
439     EVP_PKEY_CTX *pctx = ctx->pctx;
440 
441     if (pctx == NULL
442             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
443             || pctx->op.sig.algctx == NULL
444             || pctx->op.sig.signature == NULL)
445         goto legacy;
446 
447     if (pctx->op.sig.signature->digest_verify_update == NULL) {
448         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
449         return 0;
450     }
451 
452     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.algctx,
453                                                         data, dsize);
454 
455  legacy:
456     if (pctx != NULL) {
457         /* do_sigver_init() checked that |digest_custom| is non-NULL */
458         if (pctx->flag_call_digest_custom
459             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
460             return 0;
461         pctx->flag_call_digest_custom = 0;
462     }
463 
464     return EVP_DigestUpdate(ctx, data, dsize);
465 }
466 
467 #ifndef FIPS_MODULE
EVP_DigestSignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen)468 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
469                         size_t *siglen)
470 {
471     int sctx = 0, r = 0;
472     EVP_PKEY_CTX *dctx, *pctx = ctx->pctx;
473 
474     if (pctx == NULL
475             || pctx->operation != EVP_PKEY_OP_SIGNCTX
476             || pctx->op.sig.algctx == NULL
477             || pctx->op.sig.signature == NULL)
478         goto legacy;
479 
480     if (sigret == NULL || (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0)
481         return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx,
482                                                          sigret, siglen,
483                                                          sigret == NULL ? 0 : *siglen);
484     dctx = EVP_PKEY_CTX_dup(pctx);
485     if (dctx == NULL)
486         return 0;
487 
488     r = dctx->op.sig.signature->digest_sign_final(dctx->op.sig.algctx,
489                                                   sigret, siglen,
490                                                   *siglen);
491     EVP_PKEY_CTX_free(dctx);
492     return r;
493 
494  legacy:
495     if (pctx == NULL || pctx->pmeth == NULL) {
496         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
497         return 0;
498     }
499 
500     /* do_sigver_init() checked that |digest_custom| is non-NULL */
501     if (pctx->flag_call_digest_custom
502         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
503         return 0;
504     pctx->flag_call_digest_custom = 0;
505 
506     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
507         if (sigret == NULL)
508             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
509         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
510             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
511         else {
512             dctx = EVP_PKEY_CTX_dup(pctx);
513             if (dctx == NULL)
514                 return 0;
515             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
516             EVP_PKEY_CTX_free(dctx);
517         }
518         return r;
519     }
520     if (pctx->pmeth->signctx != NULL)
521         sctx = 1;
522     else
523         sctx = 0;
524     if (sigret != NULL) {
525         unsigned char md[EVP_MAX_MD_SIZE];
526         unsigned int mdlen = 0;
527 
528         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
529             if (sctx)
530                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
531             else
532                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
533         } else {
534             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
535 
536             if (tmp_ctx == NULL)
537                 return 0;
538             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
539                 EVP_MD_CTX_free(tmp_ctx);
540                 return 0;
541             }
542             if (sctx)
543                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
544                                                   sigret, siglen, tmp_ctx);
545             else
546                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
547             EVP_MD_CTX_free(tmp_ctx);
548         }
549         if (sctx || !r)
550             return r;
551         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
552             return 0;
553     } else {
554         if (sctx) {
555             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
556                 return 0;
557         } else {
558             int s = EVP_MD_get_size(ctx->digest);
559 
560             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
561                 return 0;
562         }
563     }
564     return 1;
565 }
566 
EVP_DigestSign(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen,const unsigned char * tbs,size_t tbslen)567 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
568                    const unsigned char *tbs, size_t tbslen)
569 {
570     EVP_PKEY_CTX *pctx = ctx->pctx;
571 
572     if (pctx != NULL
573             && pctx->operation == EVP_PKEY_OP_SIGNCTX
574             && pctx->op.sig.algctx != NULL
575             && pctx->op.sig.signature != NULL) {
576         if (pctx->op.sig.signature->digest_sign != NULL)
577             return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx,
578                                                        sigret, siglen,
579                                                        sigret == NULL ? 0 : *siglen,
580                                                        tbs, tbslen);
581     } else {
582         /* legacy */
583         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
584             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
585     }
586 
587     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
588         return 0;
589     return EVP_DigestSignFinal(ctx, sigret, siglen);
590 }
591 
EVP_DigestVerifyFinal(EVP_MD_CTX * ctx,const unsigned char * sig,size_t siglen)592 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
593                           size_t siglen)
594 {
595     unsigned char md[EVP_MAX_MD_SIZE];
596     int r = 0;
597     unsigned int mdlen = 0;
598     int vctx = 0;
599     EVP_PKEY_CTX *dctx, *pctx = ctx->pctx;
600 
601     if (pctx == NULL
602             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
603             || pctx->op.sig.algctx == NULL
604             || pctx->op.sig.signature == NULL)
605         goto legacy;
606 
607     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0)
608         return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx,
609                                                            sig, siglen);
610     dctx = EVP_PKEY_CTX_dup(pctx);
611     if (dctx == NULL)
612         return 0;
613 
614     r = dctx->op.sig.signature->digest_verify_final(dctx->op.sig.algctx,
615                                                     sig, siglen);
616     EVP_PKEY_CTX_free(dctx);
617     return r;
618 
619  legacy:
620     if (pctx == NULL || pctx->pmeth == NULL) {
621         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
622         return 0;
623     }
624 
625     /* do_sigver_init() checked that |digest_custom| is non-NULL */
626     if (pctx->flag_call_digest_custom
627         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
628         return 0;
629     pctx->flag_call_digest_custom = 0;
630 
631     if (pctx->pmeth->verifyctx != NULL)
632         vctx = 1;
633     else
634         vctx = 0;
635     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
636         if (vctx)
637             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
638         else
639             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
640     } else {
641         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
642         if (tmp_ctx == NULL)
643             return -1;
644         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
645             EVP_MD_CTX_free(tmp_ctx);
646             return -1;
647         }
648         if (vctx)
649             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
650                                                 sig, siglen, tmp_ctx);
651         else
652             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
653         EVP_MD_CTX_free(tmp_ctx);
654     }
655     if (vctx || !r)
656         return r;
657     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
658 }
659 
EVP_DigestVerify(EVP_MD_CTX * ctx,const unsigned char * sigret,size_t siglen,const unsigned char * tbs,size_t tbslen)660 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
661                      size_t siglen, const unsigned char *tbs, size_t tbslen)
662 {
663     EVP_PKEY_CTX *pctx = ctx->pctx;
664 
665     if (pctx != NULL
666             && pctx->operation == EVP_PKEY_OP_VERIFYCTX
667             && pctx->op.sig.algctx != NULL
668             && pctx->op.sig.signature != NULL) {
669         if (pctx->op.sig.signature->digest_verify != NULL)
670             return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx,
671                                                          sigret, siglen,
672                                                          tbs, tbslen);
673     } else {
674         /* legacy */
675         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
676             return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
677     }
678 
679     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
680         return -1;
681     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
682 }
683 #endif /* FIPS_MODULE */
684