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Commit | Line | Data |
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62867571 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
5ba372b1 | 3 | * |
62867571 RS |
4 | * Licensed under the OpenSSL license (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 | |
5ba372b1 | 8 | */ |
d02b48c6 RE |
9 | |
10 | #include <stdio.h> | |
b39fc560 | 11 | #include "internal/cryptlib.h" |
ec577822 BM |
12 | #include <openssl/objects.h> |
13 | #include <openssl/evp.h> | |
3c27208f | 14 | #include <openssl/engine.h> |
ab0a14bb | 15 | #include "internal/evp_int.h" |
77a01145 | 16 | #include "evp_locl.h" |
d02b48c6 | 17 | |
74cabf3f | 18 | /* This call frees resources associated with the context */ |
959ed531 | 19 | int EVP_MD_CTX_reset(EVP_MD_CTX *ctx) |
0f113f3e | 20 | { |
74cabf3f RL |
21 | if (ctx == NULL) |
22 | return 1; | |
23 | ||
24 | /* | |
25 | * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because | |
26 | * sometimes only copies of the context are ever finalised. | |
27 | */ | |
28 | if (ctx->digest && ctx->digest->cleanup | |
29 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) | |
30 | ctx->digest->cleanup(ctx); | |
31 | if (ctx->digest && ctx->digest->ctx_size && ctx->md_data | |
32 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { | |
33 | OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size); | |
34 | } | |
35 | EVP_PKEY_CTX_free(ctx->pctx); | |
36 | #ifndef OPENSSL_NO_ENGINE | |
7c96dbcd | 37 | ENGINE_finish(ctx->engine); |
74cabf3f | 38 | #endif |
3ce2fdab | 39 | OPENSSL_cleanse(ctx, sizeof(*ctx)); |
74cabf3f RL |
40 | |
41 | return 1; | |
0f113f3e | 42 | } |
dbad1690 | 43 | |
959ed531 | 44 | EVP_MD_CTX *EVP_MD_CTX_new(void) |
0f113f3e | 45 | { |
74cabf3f RL |
46 | return OPENSSL_zalloc(sizeof(EVP_MD_CTX)); |
47 | } | |
dbad1690 | 48 | |
959ed531 | 49 | void EVP_MD_CTX_free(EVP_MD_CTX *ctx) |
74cabf3f | 50 | { |
959ed531 | 51 | EVP_MD_CTX_reset(ctx); |
74cabf3f | 52 | OPENSSL_free(ctx); |
0f113f3e | 53 | } |
dbad1690 | 54 | |
2dc769a1 | 55 | int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) |
0f113f3e | 56 | { |
959ed531 | 57 | EVP_MD_CTX_reset(ctx); |
0f113f3e MC |
58 | return EVP_DigestInit_ex(ctx, type, NULL); |
59 | } | |
0fea7ed4 | 60 | |
11a57c7b | 61 | int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) |
0f113f3e MC |
62 | { |
63 | EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
0b13e9f0 | 64 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
65 | /* |
66 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
67 | * this context may already have an ENGINE! Try to avoid releasing the | |
68 | * previous handle, re-querying for an ENGINE, and having a | |
0d4fb843 | 69 | * reinitialisation, when it may all be unnecessary. |
0f113f3e | 70 | */ |
a93e0e78 MRA |
71 | if (ctx->engine && ctx->digest && |
72 | (type == NULL || (type->type == ctx->digest->type))) | |
0f113f3e MC |
73 | goto skip_to_init; |
74 | if (type) { | |
75 | /* | |
76 | * Ensure an ENGINE left lying around from last time is cleared (the | |
77 | * previous check attempted to avoid this if the same ENGINE and | |
78 | * EVP_MD could be used). | |
79 | */ | |
7c96dbcd RS |
80 | ENGINE_finish(ctx->engine); |
81 | if (impl != NULL) { | |
0f113f3e MC |
82 | if (!ENGINE_init(impl)) { |
83 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
84 | return 0; | |
85 | } | |
7c96dbcd | 86 | } else { |
0f113f3e MC |
87 | /* Ask if an ENGINE is reserved for this job */ |
88 | impl = ENGINE_get_digest_engine(type->type); | |
7c96dbcd RS |
89 | } |
90 | if (impl != NULL) { | |
0f113f3e MC |
91 | /* There's an ENGINE for this job ... (apparently) */ |
92 | const EVP_MD *d = ENGINE_get_digest(impl, type->type); | |
7c96dbcd RS |
93 | |
94 | if (d == NULL) { | |
0f113f3e MC |
95 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); |
96 | ENGINE_finish(impl); | |
97 | return 0; | |
98 | } | |
99 | /* We'll use the ENGINE's private digest definition */ | |
100 | type = d; | |
101 | /* | |
102 | * Store the ENGINE functional reference so we know 'type' came | |
103 | * from an ENGINE and we need to release it when done. | |
104 | */ | |
105 | ctx->engine = impl; | |
106 | } else | |
107 | ctx->engine = NULL; | |
a0108702 MC |
108 | } else { |
109 | if (!ctx->digest) { | |
110 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET); | |
111 | return 0; | |
112 | } | |
113 | type = ctx->digest; | |
0f113f3e | 114 | } |
90e8a310 | 115 | #endif |
0f113f3e | 116 | if (ctx->digest != type) { |
ffe9150b | 117 | if (ctx->digest && ctx->digest->ctx_size) { |
a93e0e78 | 118 | OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size); |
ffe9150b MC |
119 | ctx->md_data = NULL; |
120 | } | |
0f113f3e MC |
121 | ctx->digest = type; |
122 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { | |
123 | ctx->update = type->update; | |
84c15091 | 124 | ctx->md_data = OPENSSL_zalloc(type->ctx_size); |
0f113f3e MC |
125 | if (ctx->md_data == NULL) { |
126 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); | |
127 | return 0; | |
128 | } | |
129 | } | |
130 | } | |
0b13e9f0 | 131 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 132 | skip_to_init: |
0b13e9f0 | 133 | #endif |
0f113f3e MC |
134 | if (ctx->pctx) { |
135 | int r; | |
136 | r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, | |
137 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); | |
138 | if (r <= 0 && (r != -2)) | |
139 | return 0; | |
140 | } | |
141 | if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) | |
142 | return 1; | |
143 | return ctx->digest->init(ctx); | |
144 | } | |
d02b48c6 | 145 | |
f80921b6 | 146 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) |
0f113f3e MC |
147 | { |
148 | return ctx->update(ctx, data, count); | |
149 | } | |
d02b48c6 | 150 | |
dbad1690 | 151 | /* The caller can assume that this removes any secret data from the context */ |
2dc769a1 | 152 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
0f113f3e MC |
153 | { |
154 | int ret; | |
155 | ret = EVP_DigestFinal_ex(ctx, md, size); | |
959ed531 | 156 | EVP_MD_CTX_reset(ctx); |
0f113f3e MC |
157 | return ret; |
158 | } | |
20d2186c DSH |
159 | |
160 | /* The caller can assume that this removes any secret data from the context */ | |
161 | int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) | |
0f113f3e MC |
162 | { |
163 | int ret; | |
54a656ef | 164 | |
0f113f3e MC |
165 | OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); |
166 | ret = ctx->digest->final(ctx, md); | |
167 | if (size != NULL) | |
168 | *size = ctx->digest->md_size; | |
169 | if (ctx->digest->cleanup) { | |
170 | ctx->digest->cleanup(ctx); | |
171 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
172 | } | |
3ce2fdab | 173 | OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); |
0f113f3e MC |
174 | return ret; |
175 | } | |
351d8998 | 176 | |
cd8d1456 AP |
177 | int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t size) |
178 | { | |
179 | int ret = 0; | |
180 | ||
181 | if (ctx->digest->flags & EVP_MD_FLAG_XOF | |
182 | && size <= INT_MAX | |
183 | && ctx->digest->md_ctrl(ctx, EVP_MD_CTRL_XOF_LEN, (int)size, NULL)) { | |
184 | ret = ctx->digest->final(ctx, md); | |
185 | ||
186 | if (ctx->digest->cleanup != NULL) { | |
187 | ctx->digest->cleanup(ctx); | |
188 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
189 | } | |
190 | OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); | |
191 | } else { | |
192 | EVPerr(EVP_F_EVP_DIGESTFINALXOF, EVP_R_NOT_XOF_OR_INVALID_LENGTH); | |
193 | } | |
194 | ||
195 | return ret; | |
196 | } | |
197 | ||
dbad1690 | 198 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
0f113f3e | 199 | { |
959ed531 | 200 | EVP_MD_CTX_reset(out); |
0f113f3e MC |
201 | return EVP_MD_CTX_copy_ex(out, in); |
202 | } | |
20d2186c DSH |
203 | |
204 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
0f113f3e MC |
205 | { |
206 | unsigned char *tmp_buf; | |
207 | if ((in == NULL) || (in->digest == NULL)) { | |
208 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); | |
209 | return 0; | |
210 | } | |
0b13e9f0 | 211 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
212 | /* Make sure it's safe to copy a digest context using an ENGINE */ |
213 | if (in->engine && !ENGINE_init(in->engine)) { | |
214 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); | |
215 | return 0; | |
216 | } | |
0b13e9f0 | 217 | #endif |
26188931 | 218 | |
0f113f3e MC |
219 | if (out->digest == in->digest) { |
220 | tmp_buf = out->md_data; | |
221 | EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); | |
222 | } else | |
223 | tmp_buf = NULL; | |
959ed531 | 224 | EVP_MD_CTX_reset(out); |
b4faea50 | 225 | memcpy(out, in, sizeof(*out)); |
0f113f3e | 226 | |
6aa0ba4b RL |
227 | /* Null these variables, since they are getting fixed up |
228 | * properly below. Anything else may cause a memleak and/or | |
229 | * double free if any of the memory allocations below fail | |
230 | */ | |
231 | out->md_data = NULL; | |
232 | out->pctx = NULL; | |
233 | ||
0f113f3e MC |
234 | if (in->md_data && out->digest->ctx_size) { |
235 | if (tmp_buf) | |
236 | out->md_data = tmp_buf; | |
237 | else { | |
238 | out->md_data = OPENSSL_malloc(out->digest->ctx_size); | |
90945fa3 | 239 | if (out->md_data == NULL) { |
0f113f3e MC |
240 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE); |
241 | return 0; | |
242 | } | |
243 | } | |
244 | memcpy(out->md_data, in->md_data, out->digest->ctx_size); | |
245 | } | |
26188931 | 246 | |
0f113f3e | 247 | out->update = in->update; |
d4575825 | 248 | |
0f113f3e MC |
249 | if (in->pctx) { |
250 | out->pctx = EVP_PKEY_CTX_dup(in->pctx); | |
251 | if (!out->pctx) { | |
959ed531 | 252 | EVP_MD_CTX_reset(out); |
0f113f3e MC |
253 | return 0; |
254 | } | |
255 | } | |
18327cd0 | 256 | |
0f113f3e MC |
257 | if (out->digest->copy) |
258 | return out->digest->copy(out, in); | |
3a828611 | 259 | |
0f113f3e MC |
260 | return 1; |
261 | } | |
88ce56f8 | 262 | |
9e0aad9f | 263 | int EVP_Digest(const void *data, size_t count, |
0f113f3e MC |
264 | unsigned char *md, unsigned int *size, const EVP_MD *type, |
265 | ENGINE *impl) | |
266 | { | |
bfb0641f | 267 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); |
0f113f3e | 268 | int ret; |
dbad1690 | 269 | |
74cabf3f RL |
270 | if (ctx == NULL) |
271 | return 0; | |
272 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT); | |
273 | ret = EVP_DigestInit_ex(ctx, type, impl) | |
274 | && EVP_DigestUpdate(ctx, data, count) | |
275 | && EVP_DigestFinal_ex(ctx, md, size); | |
bfb0641f | 276 | EVP_MD_CTX_free(ctx); |
dbad1690 | 277 | |
0f113f3e MC |
278 | return ret; |
279 | } | |
dbad1690 | 280 | |
396d5fd0 DSH |
281 | int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2) |
282 | { | |
283 | if (ctx->digest && ctx->digest->md_ctrl) { | |
284 | int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2); | |
285 | if (ret <= 0) | |
286 | return 0; | |
287 | return 1; | |
288 | } | |
289 | return 0; | |
290 | } |