xref: /openssl/crypto/evp/m_sigver.c (revision 82e7a113)
1 /*
2  * Copyright 2006-2024 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 
update(EVP_MD_CTX * ctx,const void * data,size_t datalen)19 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
20 {
21     ERR_raise(ERR_LIB_EVP, EVP_R_ONLY_ONESHOT_SUPPORTED);
22     return 0;
23 }
24 
25 /*
26  * If we get the "NULL" md then the name comes back as "UNDEF". We want to use
27  * NULL for this.
28  */
canon_mdname(const char * mdname)29 static const char *canon_mdname(const char *mdname)
30 {
31     if (mdname != NULL && strcmp(mdname, "UNDEF") == 0)
32         return NULL;
33 
34     return mdname;
35 }
36 
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[])37 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
38                           const EVP_MD *type, const char *mdname,
39                           OSSL_LIB_CTX *libctx, const char *props,
40                           ENGINE *e, EVP_PKEY *pkey, int ver,
41                           const OSSL_PARAM params[])
42 {
43     EVP_PKEY_CTX *locpctx = NULL;
44     EVP_SIGNATURE *signature = NULL;
45     EVP_KEYMGMT *tmp_keymgmt = NULL;
46     const OSSL_PROVIDER *tmp_prov = NULL;
47     const char *supported_sig = NULL;
48     char locmdname[80] = "";     /* 80 chars should be enough */
49     void *provkey = NULL;
50     int ret, iter, reinit = 1;
51 
52     if (!evp_md_ctx_free_algctx(ctx))
53         return 0;
54 
55     if (ctx->pctx == NULL) {
56         reinit = 0;
57         if (e == NULL)
58             ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props);
59         else
60             ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
61     }
62     if (ctx->pctx == NULL)
63         return 0;
64 
65     EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_FINALISED);
66 
67     locpctx = ctx->pctx;
68     ERR_set_mark();
69 
70     if (evp_pkey_ctx_is_legacy(locpctx))
71         goto legacy;
72 
73     /* do not reinitialize if pkey is set or operation is different */
74     if (reinit
75         && (pkey != NULL
76             || locpctx->operation != (ver ? EVP_PKEY_OP_VERIFYCTX
77                                           : EVP_PKEY_OP_SIGNCTX)
78             || (signature = locpctx->op.sig.signature) == NULL
79             || locpctx->op.sig.algctx == NULL))
80         reinit = 0;
81 
82     if (props == NULL)
83         props = locpctx->propquery;
84 
85     if (locpctx->pkey == NULL) {
86         ERR_clear_last_mark();
87         ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
88         goto err;
89     }
90 
91     if (!reinit) {
92         evp_pkey_ctx_free_old_ops(locpctx);
93     } else {
94         if (mdname == NULL && type == NULL)
95             mdname = canon_mdname(EVP_MD_get0_name(ctx->reqdigest));
96         goto reinitialize;
97     }
98 
99     /*
100      * Try to derive the supported signature from |locpctx->keymgmt|.
101      */
102     if (!ossl_assert(locpctx->pkey->keymgmt == NULL
103                      || locpctx->pkey->keymgmt == locpctx->keymgmt)) {
104         ERR_clear_last_mark();
105         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
106         goto err;
107     }
108     supported_sig = evp_keymgmt_util_query_operation_name(locpctx->keymgmt,
109                                                           OSSL_OP_SIGNATURE);
110     if (supported_sig == NULL) {
111         ERR_clear_last_mark();
112         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
113         goto err;
114     }
115 
116     /*
117      * We perform two iterations:
118      *
119      * 1.  Do the normal signature fetch, using the fetching data given by
120      *     the EVP_PKEY_CTX.
121      * 2.  Do the provider specific signature fetch, from the same provider
122      *     as |ctx->keymgmt|
123      *
124      * We then try to fetch the keymgmt from the same provider as the
125      * signature, and try to export |ctx->pkey| to that keymgmt (when
126      * this keymgmt happens to be the same as |ctx->keymgmt|, the export
127      * is a no-op, but we call it anyway to not complicate the code even
128      * more).
129      * If the export call succeeds (returns a non-NULL provider key pointer),
130      * we're done and can perform the operation itself.  If not, we perform
131      * the second iteration, or jump to legacy.
132      */
133     for (iter = 1, provkey = NULL; iter < 3 && provkey == NULL; iter++) {
134         EVP_KEYMGMT *tmp_keymgmt_tofree = NULL;
135 
136         /*
137          * If we're on the second iteration, free the results from the first.
138          * They are NULL on the first iteration, so no need to check what
139          * iteration we're on.
140          */
141         EVP_SIGNATURE_free(signature);
142         EVP_KEYMGMT_free(tmp_keymgmt);
143 
144         switch (iter) {
145         case 1:
146             signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
147                                             locpctx->propquery);
148             if (signature != NULL)
149                 tmp_prov = EVP_SIGNATURE_get0_provider(signature);
150             break;
151         case 2:
152             tmp_prov = EVP_KEYMGMT_get0_provider(locpctx->keymgmt);
153             signature =
154                 evp_signature_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
155                                               supported_sig, locpctx->propquery);
156             if (signature == NULL)
157                 goto legacy;
158             break;
159         }
160         if (signature == NULL)
161             continue;
162 
163         /*
164          * Ensure that the key is provided, either natively, or as a cached
165          * export.  We start by fetching the keymgmt with the same name as
166          * |locpctx->pkey|, but from the provider of the signature method, using
167          * the same property query as when fetching the signature method.
168          * With the keymgmt we found (if we did), we try to export |locpctx->pkey|
169          * to it (evp_pkey_export_to_provider() is smart enough to only actually
170 
171          * export it if |tmp_keymgmt| is different from |locpctx->pkey|'s keymgmt)
172          */
173         tmp_keymgmt_tofree = tmp_keymgmt =
174             evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
175                                         EVP_KEYMGMT_get0_name(locpctx->keymgmt),
176                                         locpctx->propquery);
177         if (tmp_keymgmt != NULL)
178             provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
179                                                   &tmp_keymgmt, locpctx->propquery);
180         if (tmp_keymgmt == NULL)
181             EVP_KEYMGMT_free(tmp_keymgmt_tofree);
182     }
183 
184     if (provkey == NULL) {
185         EVP_SIGNATURE_free(signature);
186         ERR_clear_last_mark();
187         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
188         goto err;
189     }
190 
191     ERR_pop_to_mark();
192 
193     /* No more legacy from here down to legacy: */
194 
195     locpctx->op.sig.signature = signature;
196     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
197                              : EVP_PKEY_OP_SIGNCTX;
198     locpctx->op.sig.algctx
199         = signature->newctx(ossl_provider_ctx(signature->prov), props);
200     if (locpctx->op.sig.algctx == NULL) {
201         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
202         goto err;
203     }
204 
205  reinitialize:
206     if (pctx != NULL)
207         *pctx = locpctx;
208 
209     if (type != NULL) {
210         ctx->reqdigest = type;
211         if (mdname == NULL)
212             mdname = canon_mdname(EVP_MD_get0_name(type));
213     } else {
214         if (mdname == NULL && !reinit) {
215             if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
216                                                        locmdname,
217                                                        sizeof(locmdname)) > 0) {
218                 mdname = canon_mdname(locmdname);
219             }
220         }
221 
222         if (mdname != NULL) {
223             /*
224              * We're about to get a new digest so clear anything associated with
225              * an old digest.
226              */
227             evp_md_ctx_clear_digest(ctx, 1, 0);
228 
229             /* legacy code support for engines */
230             ERR_set_mark();
231             /*
232              * This might be requested by a later call to EVP_MD_CTX_get0_md().
233              * In that case the "explicit fetch" rules apply for that
234              * function (as per man pages), i.e. the ref count is not updated
235              * so the EVP_MD should not be used beyond the lifetime of the
236              * EVP_MD_CTX.
237              */
238             ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props);
239             if (ctx->fetched_digest != NULL) {
240                 ctx->digest = ctx->reqdigest = ctx->fetched_digest;
241             } else {
242                 /* legacy engine support : remove the mark when this is deleted */
243                 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname);
244                 if (ctx->digest == NULL) {
245                     (void)ERR_clear_last_mark();
246                     ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
247                     goto err;
248                 }
249             }
250             (void)ERR_pop_to_mark();
251         }
252     }
253 
254     if (ver) {
255         if (signature->digest_verify_init == NULL) {
256             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
257             goto err;
258         }
259         ret = signature->digest_verify_init(locpctx->op.sig.algctx,
260                                             mdname, provkey, params);
261     } else {
262         if (signature->digest_sign_init == NULL) {
263             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
264             goto err;
265         }
266         ret = signature->digest_sign_init(locpctx->op.sig.algctx,
267                                           mdname, provkey, params);
268     }
269 
270     /*
271      * If the operation was not a success and no digest was found, an error
272      * needs to be raised.
273      */
274     if (ret > 0 || mdname != NULL)
275         goto end;
276     if (type == NULL)   /* This check is redundant but clarifies matters */
277         ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
278 
279  err:
280     evp_pkey_ctx_free_old_ops(locpctx);
281     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
282     EVP_KEYMGMT_free(tmp_keymgmt);
283     return 0;
284 
285  legacy:
286     /*
287      * If we don't have the full support we need with provided methods,
288      * let's go see if legacy does.
289      */
290     ERR_pop_to_mark();
291     EVP_KEYMGMT_free(tmp_keymgmt);
292     tmp_keymgmt = NULL;
293 
294     if (type == NULL && mdname != NULL)
295         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
296 
297     if (ctx->pctx->pmeth == NULL) {
298         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
299         return 0;
300     }
301 
302     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
303 
304         if (type == NULL) {
305             int def_nid;
306             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
307                 type = EVP_get_digestbynid(def_nid);
308         }
309 
310         if (type == NULL) {
311             ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
312             return 0;
313         }
314     }
315 
316     if (ver) {
317         if (ctx->pctx->pmeth->verifyctx_init) {
318             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
319                 return 0;
320             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
321         } else if (ctx->pctx->pmeth->digestverify != 0) {
322             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
323             ctx->update = update;
324         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
325             return 0;
326         }
327     } else {
328         if (ctx->pctx->pmeth->signctx_init) {
329             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
330                 return 0;
331             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
332         } else if (ctx->pctx->pmeth->digestsign != 0) {
333             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
334             ctx->update = update;
335         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
336             return 0;
337         }
338     }
339     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
340         return 0;
341     if (pctx)
342         *pctx = ctx->pctx;
343     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
344         return 1;
345     if (!EVP_DigestInit_ex(ctx, type, e))
346         return 0;
347     /*
348      * This indicates the current algorithm requires
349      * special treatment before hashing the tbs-message.
350      */
351     ctx->pctx->flag_call_digest_custom = 0;
352     if (ctx->pctx->pmeth->digest_custom != NULL)
353         ctx->pctx->flag_call_digest_custom = 1;
354 
355     ret = 1;
356  end:
357     if (ret > 0)
358         ret = evp_pkey_ctx_use_cached_data(locpctx);
359 
360     EVP_KEYMGMT_free(tmp_keymgmt);
361     return ret > 0 ? 1 : 0;
362 }
363 
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[])364 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
365                           const char *mdname, OSSL_LIB_CTX *libctx,
366                           const char *props, EVP_PKEY *pkey,
367                           const OSSL_PARAM params[])
368 {
369     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0,
370                           params);
371 }
372 
EVP_DigestSignInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)373 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
374                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
375 {
376     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0,
377                           NULL);
378 }
379 
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[])380 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
381                             const char *mdname, OSSL_LIB_CTX *libctx,
382                             const char *props, EVP_PKEY *pkey,
383                             const OSSL_PARAM params[])
384 {
385     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1,
386                           params);
387 }
388 
EVP_DigestVerifyInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)389 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
390                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
391 {
392     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1,
393                           NULL);
394 }
395 
EVP_DigestSignUpdate(EVP_MD_CTX * ctx,const void * data,size_t dsize)396 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
397 {
398     EVP_PKEY_CTX *pctx = ctx->pctx;
399 
400     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
401         ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
402         return 0;
403     }
404 
405     if (pctx == NULL
406             || pctx->operation != EVP_PKEY_OP_SIGNCTX
407             || pctx->op.sig.algctx == NULL
408             || pctx->op.sig.signature == NULL)
409         goto legacy;
410 
411     if (pctx->op.sig.signature->digest_sign_update == NULL) {
412         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
413         return 0;
414     }
415 
416     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.algctx,
417                                                       data, dsize);
418 
419  legacy:
420     if (pctx != NULL) {
421         /* do_sigver_init() checked that |digest_custom| is non-NULL */
422         if (pctx->flag_call_digest_custom
423             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
424             return 0;
425         pctx->flag_call_digest_custom = 0;
426     }
427 
428     return EVP_DigestUpdate(ctx, data, dsize);
429 }
430 
EVP_DigestVerifyUpdate(EVP_MD_CTX * ctx,const void * data,size_t dsize)431 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
432 {
433     EVP_PKEY_CTX *pctx = ctx->pctx;
434 
435     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
436         ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
437         return 0;
438     }
439 
440     if (pctx == NULL
441             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
442             || pctx->op.sig.algctx == NULL
443             || pctx->op.sig.signature == NULL)
444         goto legacy;
445 
446     if (pctx->op.sig.signature->digest_verify_update == NULL) {
447         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
448         return 0;
449     }
450 
451     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.algctx,
452                                                         data, dsize);
453 
454  legacy:
455     if (pctx != NULL) {
456         /* do_sigver_init() checked that |digest_custom| is non-NULL */
457         if (pctx->flag_call_digest_custom
458             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
459             return 0;
460         pctx->flag_call_digest_custom = 0;
461     }
462 
463     return EVP_DigestUpdate(ctx, data, dsize);
464 }
465 
EVP_DigestSignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen)466 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
467                         size_t *siglen)
468 {
469     int sctx = 0;
470     int r = 0;
471     EVP_PKEY_CTX *dctx = NULL, *pctx = ctx->pctx;
472 
473     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
474         ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
475         return 0;
476     }
477 
478     if (pctx == NULL
479             || pctx->operation != EVP_PKEY_OP_SIGNCTX
480             || pctx->op.sig.algctx == NULL
481             || pctx->op.sig.signature == NULL)
482         goto legacy;
483 
484     if (sigret != NULL && (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) == 0) {
485         /* try dup */
486         dctx = EVP_PKEY_CTX_dup(pctx);
487         if (dctx != NULL)
488             pctx = dctx;
489     }
490     r = pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx,
491                                                   sigret, siglen,
492                                                   sigret == NULL ? 0 : *siglen);
493     if (dctx == NULL && sigret != NULL)
494         ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
495     else
496         EVP_PKEY_CTX_free(dctx);
497     return r;
498 
499  legacy:
500     if (pctx == NULL || pctx->pmeth == NULL) {
501         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
502         return 0;
503     }
504 
505     /* do_sigver_init() checked that |digest_custom| is non-NULL */
506     if (pctx->flag_call_digest_custom
507         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
508         return 0;
509     pctx->flag_call_digest_custom = 0;
510 
511     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
512         if (sigret == NULL)
513             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
514         if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0) {
515             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
516             ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
517         } else {
518             dctx = EVP_PKEY_CTX_dup(pctx);
519             if (dctx == NULL)
520                 return 0;
521             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
522             EVP_PKEY_CTX_free(dctx);
523         }
524         return r;
525     }
526     if (pctx->pmeth->signctx != NULL)
527         sctx = 1;
528     else
529         sctx = 0;
530     if (sigret != NULL) {
531         unsigned char md[EVP_MAX_MD_SIZE];
532         unsigned int mdlen = 0;
533 
534         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
535             if (sctx)
536                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
537             else
538                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
539         } else {
540             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
541 
542             if (tmp_ctx == NULL)
543                 return 0;
544             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
545                 EVP_MD_CTX_free(tmp_ctx);
546                 return 0;
547             }
548             if (sctx)
549                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
550                                                   sigret, siglen, tmp_ctx);
551             else
552                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
553             EVP_MD_CTX_free(tmp_ctx);
554         }
555         if (sctx || !r)
556             return r;
557         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
558             return 0;
559     } else {
560         if (sctx) {
561             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
562                 return 0;
563         } else {
564             int s = EVP_MD_get_size(ctx->digest);
565 
566             if (s <= 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
567                 return 0;
568         }
569     }
570     return 1;
571 }
572 
EVP_DigestSign(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen,const unsigned char * tbs,size_t tbslen)573 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
574                    const unsigned char *tbs, size_t tbslen)
575 {
576     EVP_PKEY_CTX *pctx = ctx->pctx;
577 
578     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
579         ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
580         return 0;
581     }
582 
583     if (pctx != NULL
584             && pctx->operation == EVP_PKEY_OP_SIGNCTX
585             && pctx->op.sig.algctx != NULL
586             && pctx->op.sig.signature != NULL) {
587         if (pctx->op.sig.signature->digest_sign != NULL) {
588             if (sigret != NULL)
589                 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
590             return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx,
591                                                        sigret, siglen,
592                                                        sigret == NULL ? 0 : *siglen,
593                                                        tbs, tbslen);
594         }
595     } else {
596         /* legacy */
597         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
598             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
599     }
600 
601     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
602         return 0;
603     return EVP_DigestSignFinal(ctx, sigret, siglen);
604 }
605 
EVP_DigestVerifyFinal(EVP_MD_CTX * ctx,const unsigned char * sig,size_t siglen)606 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
607                           size_t siglen)
608 {
609     int vctx = 0;
610     unsigned int mdlen = 0;
611     unsigned char md[EVP_MAX_MD_SIZE];
612     int r = 0;
613     EVP_PKEY_CTX *dctx = NULL, *pctx = ctx->pctx;
614 
615     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
616         ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
617         return 0;
618     }
619 
620     if (pctx == NULL
621             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
622             || pctx->op.sig.algctx == NULL
623             || pctx->op.sig.signature == NULL)
624         goto legacy;
625 
626     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) == 0) {
627         /* try dup */
628         dctx = EVP_PKEY_CTX_dup(pctx);
629         if (dctx != NULL)
630             pctx = dctx;
631     }
632     r = pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx,
633                                                     sig, siglen);
634     if (dctx == NULL)
635         ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
636     else
637         EVP_PKEY_CTX_free(dctx);
638     return r;
639 
640  legacy:
641     if (pctx == NULL || pctx->pmeth == NULL) {
642         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
643         return 0;
644     }
645 
646     /* do_sigver_init() checked that |digest_custom| is non-NULL */
647     if (pctx->flag_call_digest_custom
648         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
649         return 0;
650     pctx->flag_call_digest_custom = 0;
651 
652     if (pctx->pmeth->verifyctx != NULL)
653         vctx = 1;
654     else
655         vctx = 0;
656     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
657         if (vctx) {
658             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
659             ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
660         } else
661             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
662     } else {
663         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
664         if (tmp_ctx == NULL)
665             return -1;
666         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
667             EVP_MD_CTX_free(tmp_ctx);
668             return -1;
669         }
670         if (vctx)
671             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
672                                                 sig, siglen, tmp_ctx);
673         else
674             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
675         EVP_MD_CTX_free(tmp_ctx);
676     }
677     if (vctx || !r)
678         return r;
679     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
680 }
681 
EVP_DigestVerify(EVP_MD_CTX * ctx,const unsigned char * sigret,size_t siglen,const unsigned char * tbs,size_t tbslen)682 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
683                      size_t siglen, const unsigned char *tbs, size_t tbslen)
684 {
685     EVP_PKEY_CTX *pctx = ctx->pctx;
686 
687     if (pctx == NULL) {
688         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
689         return -1;
690     }
691 
692     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
693         ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
694         return 0;
695     }
696 
697     if (pctx->operation == EVP_PKEY_OP_VERIFYCTX
698             && pctx->op.sig.algctx != NULL
699             && pctx->op.sig.signature != NULL) {
700         if (pctx->op.sig.signature->digest_verify != NULL) {
701             ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
702             return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx,
703                                                          sigret, siglen,
704                                                          tbs, tbslen);
705         }
706     } else {
707         /* legacy */
708         if (pctx->pmeth != NULL && pctx->pmeth->digestverify != NULL)
709             return pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
710     }
711     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
712         return -1;
713     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
714 }
715