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