]>
Commit | Line | Data |
---|---|---|
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 |
16f8d4eb | 39 | memset(ctx, 0, 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 MC |
70 | */ |
71 | if (ctx->engine && ctx->digest && (!type || | |
72 | (type | |
73 | && (type->type == | |
74 | ctx->digest->type)))) | |
75 | goto skip_to_init; | |
76 | if (type) { | |
77 | /* | |
78 | * Ensure an ENGINE left lying around from last time is cleared (the | |
79 | * previous check attempted to avoid this if the same ENGINE and | |
80 | * EVP_MD could be used). | |
81 | */ | |
7c96dbcd RS |
82 | ENGINE_finish(ctx->engine); |
83 | if (impl != NULL) { | |
0f113f3e MC |
84 | if (!ENGINE_init(impl)) { |
85 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
86 | return 0; | |
87 | } | |
7c96dbcd | 88 | } else { |
0f113f3e MC |
89 | /* Ask if an ENGINE is reserved for this job */ |
90 | impl = ENGINE_get_digest_engine(type->type); | |
7c96dbcd RS |
91 | } |
92 | if (impl != NULL) { | |
0f113f3e MC |
93 | /* There's an ENGINE for this job ... (apparently) */ |
94 | const EVP_MD *d = ENGINE_get_digest(impl, type->type); | |
7c96dbcd RS |
95 | |
96 | if (d == NULL) { | |
0f113f3e MC |
97 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); |
98 | ENGINE_finish(impl); | |
99 | return 0; | |
100 | } | |
101 | /* We'll use the ENGINE's private digest definition */ | |
102 | type = d; | |
103 | /* | |
104 | * Store the ENGINE functional reference so we know 'type' came | |
105 | * from an ENGINE and we need to release it when done. | |
106 | */ | |
107 | ctx->engine = impl; | |
108 | } else | |
109 | ctx->engine = NULL; | |
a0108702 MC |
110 | } else { |
111 | if (!ctx->digest) { | |
112 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET); | |
113 | return 0; | |
114 | } | |
115 | type = ctx->digest; | |
0f113f3e | 116 | } |
90e8a310 | 117 | #endif |
0f113f3e | 118 | if (ctx->digest != type) { |
ffe9150b | 119 | if (ctx->digest && ctx->digest->ctx_size) { |
0f113f3e | 120 | OPENSSL_free(ctx->md_data); |
ffe9150b MC |
121 | ctx->md_data = NULL; |
122 | } | |
0f113f3e MC |
123 | ctx->digest = type; |
124 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { | |
125 | ctx->update = type->update; | |
84c15091 | 126 | ctx->md_data = OPENSSL_zalloc(type->ctx_size); |
0f113f3e MC |
127 | if (ctx->md_data == NULL) { |
128 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); | |
129 | return 0; | |
130 | } | |
131 | } | |
132 | } | |
0b13e9f0 | 133 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 134 | skip_to_init: |
0b13e9f0 | 135 | #endif |
0f113f3e MC |
136 | if (ctx->pctx) { |
137 | int r; | |
138 | r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, | |
139 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); | |
140 | if (r <= 0 && (r != -2)) | |
141 | return 0; | |
142 | } | |
143 | if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) | |
144 | return 1; | |
145 | return ctx->digest->init(ctx); | |
146 | } | |
d02b48c6 | 147 | |
f80921b6 | 148 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) |
0f113f3e MC |
149 | { |
150 | return ctx->update(ctx, data, count); | |
151 | } | |
d02b48c6 | 152 | |
dbad1690 | 153 | /* The caller can assume that this removes any secret data from the context */ |
2dc769a1 | 154 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
0f113f3e MC |
155 | { |
156 | int ret; | |
157 | ret = EVP_DigestFinal_ex(ctx, md, size); | |
959ed531 | 158 | EVP_MD_CTX_reset(ctx); |
0f113f3e MC |
159 | return ret; |
160 | } | |
20d2186c DSH |
161 | |
162 | /* The caller can assume that this removes any secret data from the context */ | |
163 | int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) | |
0f113f3e MC |
164 | { |
165 | int ret; | |
54a656ef | 166 | |
0f113f3e MC |
167 | OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); |
168 | ret = ctx->digest->final(ctx, md); | |
169 | if (size != NULL) | |
170 | *size = ctx->digest->md_size; | |
171 | if (ctx->digest->cleanup) { | |
172 | ctx->digest->cleanup(ctx); | |
173 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
174 | } | |
175 | memset(ctx->md_data, 0, ctx->digest->ctx_size); | |
176 | return ret; | |
177 | } | |
351d8998 | 178 | |
dbad1690 | 179 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
0f113f3e | 180 | { |
959ed531 | 181 | EVP_MD_CTX_reset(out); |
0f113f3e MC |
182 | return EVP_MD_CTX_copy_ex(out, in); |
183 | } | |
20d2186c DSH |
184 | |
185 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
0f113f3e MC |
186 | { |
187 | unsigned char *tmp_buf; | |
188 | if ((in == NULL) || (in->digest == NULL)) { | |
189 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); | |
190 | return 0; | |
191 | } | |
0b13e9f0 | 192 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
193 | /* Make sure it's safe to copy a digest context using an ENGINE */ |
194 | if (in->engine && !ENGINE_init(in->engine)) { | |
195 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); | |
196 | return 0; | |
197 | } | |
0b13e9f0 | 198 | #endif |
26188931 | 199 | |
0f113f3e MC |
200 | if (out->digest == in->digest) { |
201 | tmp_buf = out->md_data; | |
202 | EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); | |
203 | } else | |
204 | tmp_buf = NULL; | |
959ed531 | 205 | EVP_MD_CTX_reset(out); |
b4faea50 | 206 | memcpy(out, in, sizeof(*out)); |
0f113f3e | 207 | |
6aa0ba4b RL |
208 | /* Null these variables, since they are getting fixed up |
209 | * properly below. Anything else may cause a memleak and/or | |
210 | * double free if any of the memory allocations below fail | |
211 | */ | |
212 | out->md_data = NULL; | |
213 | out->pctx = NULL; | |
214 | ||
0f113f3e MC |
215 | if (in->md_data && out->digest->ctx_size) { |
216 | if (tmp_buf) | |
217 | out->md_data = tmp_buf; | |
218 | else { | |
219 | out->md_data = OPENSSL_malloc(out->digest->ctx_size); | |
90945fa3 | 220 | if (out->md_data == NULL) { |
0f113f3e MC |
221 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE); |
222 | return 0; | |
223 | } | |
224 | } | |
225 | memcpy(out->md_data, in->md_data, out->digest->ctx_size); | |
226 | } | |
26188931 | 227 | |
0f113f3e | 228 | out->update = in->update; |
d4575825 | 229 | |
0f113f3e MC |
230 | if (in->pctx) { |
231 | out->pctx = EVP_PKEY_CTX_dup(in->pctx); | |
232 | if (!out->pctx) { | |
959ed531 | 233 | EVP_MD_CTX_reset(out); |
0f113f3e MC |
234 | return 0; |
235 | } | |
236 | } | |
18327cd0 | 237 | |
0f113f3e MC |
238 | if (out->digest->copy) |
239 | return out->digest->copy(out, in); | |
3a828611 | 240 | |
0f113f3e MC |
241 | return 1; |
242 | } | |
88ce56f8 | 243 | |
9e0aad9f | 244 | int EVP_Digest(const void *data, size_t count, |
0f113f3e MC |
245 | unsigned char *md, unsigned int *size, const EVP_MD *type, |
246 | ENGINE *impl) | |
247 | { | |
bfb0641f | 248 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); |
0f113f3e | 249 | int ret; |
dbad1690 | 250 | |
74cabf3f RL |
251 | if (ctx == NULL) |
252 | return 0; | |
253 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT); | |
254 | ret = EVP_DigestInit_ex(ctx, type, impl) | |
255 | && EVP_DigestUpdate(ctx, data, count) | |
256 | && EVP_DigestFinal_ex(ctx, md, size); | |
bfb0641f | 257 | EVP_MD_CTX_free(ctx); |
dbad1690 | 258 | |
0f113f3e MC |
259 | return ret; |
260 | } | |
dbad1690 | 261 | |
396d5fd0 DSH |
262 | int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2) |
263 | { | |
264 | if (ctx->digest && ctx->digest->md_ctrl) { | |
265 | int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2); | |
266 | if (ret <= 0) | |
267 | return 0; | |
268 | return 1; | |
269 | } | |
270 | return 0; | |
271 | } |