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d02b48c6 | 1 | /* crypto/evp/bio_md.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 8 | * |
d02b48c6 RE |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 15 | * |
d02b48c6 RE |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 22 | * |
d02b48c6 RE |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
0f113f3e | 52 | * |
d02b48c6 RE |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include <errno.h> | |
b39fc560 | 61 | #include "internal/cryptlib.h" |
ec577822 BM |
62 | #include <openssl/buffer.h> |
63 | #include <openssl/evp.h> | |
d02b48c6 | 64 | |
0f113f3e MC |
65 | /* |
66 | * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest | |
67 | */ | |
d02b48c6 | 68 | |
0e1c0612 UM |
69 | static int md_write(BIO *h, char const *buf, int num); |
70 | static int md_read(BIO *h, char *buf, int size); | |
0f113f3e MC |
71 | /* |
72 | * static int md_puts(BIO *h, const char *str); | |
73 | */ | |
0e1c0612 UM |
74 | static int md_gets(BIO *h, char *str, int size); |
75 | static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2); | |
d02b48c6 RE |
76 | static int md_new(BIO *h); |
77 | static int md_free(BIO *data); | |
0f113f3e | 78 | static long md_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); |
d3442bc7 | 79 | |
0f113f3e MC |
80 | static BIO_METHOD methods_md = { |
81 | BIO_TYPE_MD, "message digest", | |
82 | md_write, | |
83 | md_read, | |
84 | NULL, /* md_puts, */ | |
85 | md_gets, | |
86 | md_ctrl, | |
87 | md_new, | |
88 | md_free, | |
89 | md_callback_ctrl, | |
90 | }; | |
d02b48c6 | 91 | |
6b691a5c | 92 | BIO_METHOD *BIO_f_md(void) |
0f113f3e MC |
93 | { |
94 | return (&methods_md); | |
95 | } | |
d02b48c6 | 96 | |
6b691a5c | 97 | static int md_new(BIO *bi) |
0f113f3e MC |
98 | { |
99 | EVP_MD_CTX *ctx; | |
d02b48c6 | 100 | |
0f113f3e MC |
101 | ctx = EVP_MD_CTX_create(); |
102 | if (ctx == NULL) | |
103 | return (0); | |
d02b48c6 | 104 | |
0f113f3e MC |
105 | bi->init = 0; |
106 | bi->ptr = (char *)ctx; | |
107 | bi->flags = 0; | |
108 | return (1); | |
109 | } | |
d02b48c6 | 110 | |
6b691a5c | 111 | static int md_free(BIO *a) |
0f113f3e MC |
112 | { |
113 | if (a == NULL) | |
114 | return (0); | |
115 | EVP_MD_CTX_destroy(a->ptr); | |
116 | a->ptr = NULL; | |
117 | a->init = 0; | |
118 | a->flags = 0; | |
119 | return (1); | |
120 | } | |
121 | ||
6b691a5c | 122 | static int md_read(BIO *b, char *out, int outl) |
0f113f3e MC |
123 | { |
124 | int ret = 0; | |
125 | EVP_MD_CTX *ctx; | |
d02b48c6 | 126 | |
0f113f3e MC |
127 | if (out == NULL) |
128 | return (0); | |
129 | ctx = b->ptr; | |
d02b48c6 | 130 | |
0f113f3e MC |
131 | if ((ctx == NULL) || (b->next_bio == NULL)) |
132 | return (0); | |
d02b48c6 | 133 | |
0f113f3e MC |
134 | ret = BIO_read(b->next_bio, out, outl); |
135 | if (b->init) { | |
136 | if (ret > 0) { | |
137 | if (EVP_DigestUpdate(ctx, (unsigned char *)out, | |
138 | (unsigned int)ret) <= 0) | |
139 | return (-1); | |
140 | } | |
141 | } | |
142 | BIO_clear_retry_flags(b); | |
143 | BIO_copy_next_retry(b); | |
144 | return (ret); | |
145 | } | |
d02b48c6 | 146 | |
0e1c0612 | 147 | static int md_write(BIO *b, const char *in, int inl) |
0f113f3e MC |
148 | { |
149 | int ret = 0; | |
150 | EVP_MD_CTX *ctx; | |
d02b48c6 | 151 | |
0f113f3e MC |
152 | if ((in == NULL) || (inl <= 0)) |
153 | return (0); | |
154 | ctx = b->ptr; | |
d02b48c6 | 155 | |
0f113f3e MC |
156 | if ((ctx != NULL) && (b->next_bio != NULL)) |
157 | ret = BIO_write(b->next_bio, in, inl); | |
158 | if (b->init) { | |
159 | if (ret > 0) { | |
160 | if (!EVP_DigestUpdate(ctx, (const unsigned char *)in, | |
161 | (unsigned int)ret)) { | |
162 | BIO_clear_retry_flags(b); | |
163 | return 0; | |
164 | } | |
165 | } | |
166 | } | |
167 | if (b->next_bio != NULL) { | |
168 | BIO_clear_retry_flags(b); | |
169 | BIO_copy_next_retry(b); | |
170 | } | |
171 | return (ret); | |
172 | } | |
d02b48c6 | 173 | |
0e1c0612 | 174 | static long md_ctrl(BIO *b, int cmd, long num, void *ptr) |
0f113f3e MC |
175 | { |
176 | EVP_MD_CTX *ctx, *dctx, **pctx; | |
177 | const EVP_MD **ppmd; | |
178 | EVP_MD *md; | |
179 | long ret = 1; | |
180 | BIO *dbio; | |
d02b48c6 | 181 | |
0f113f3e | 182 | ctx = b->ptr; |
d02b48c6 | 183 | |
0f113f3e MC |
184 | switch (cmd) { |
185 | case BIO_CTRL_RESET: | |
186 | if (b->init) | |
187 | ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL); | |
188 | else | |
189 | ret = 0; | |
190 | if (ret > 0) | |
191 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
192 | break; | |
193 | case BIO_C_GET_MD: | |
194 | if (b->init) { | |
195 | ppmd = ptr; | |
196 | *ppmd = ctx->digest; | |
197 | } else | |
198 | ret = 0; | |
199 | break; | |
200 | case BIO_C_GET_MD_CTX: | |
201 | pctx = ptr; | |
202 | *pctx = ctx; | |
203 | b->init = 1; | |
204 | break; | |
205 | case BIO_C_SET_MD_CTX: | |
206 | if (b->init) | |
207 | b->ptr = ptr; | |
208 | else | |
209 | ret = 0; | |
210 | break; | |
211 | case BIO_C_DO_STATE_MACHINE: | |
212 | BIO_clear_retry_flags(b); | |
213 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
214 | BIO_copy_next_retry(b); | |
215 | break; | |
d02b48c6 | 216 | |
0f113f3e MC |
217 | case BIO_C_SET_MD: |
218 | md = ptr; | |
219 | ret = EVP_DigestInit_ex(ctx, md, NULL); | |
220 | if (ret > 0) | |
221 | b->init = 1; | |
222 | break; | |
223 | case BIO_CTRL_DUP: | |
224 | dbio = ptr; | |
225 | dctx = dbio->ptr; | |
226 | if (!EVP_MD_CTX_copy_ex(dctx, ctx)) | |
227 | return 0; | |
228 | b->init = 1; | |
229 | break; | |
230 | default: | |
231 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
232 | break; | |
233 | } | |
234 | return (ret); | |
235 | } | |
d02b48c6 | 236 | |
13083215 | 237 | static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
0f113f3e MC |
238 | { |
239 | long ret = 1; | |
d3442bc7 | 240 | |
0f113f3e MC |
241 | if (b->next_bio == NULL) |
242 | return (0); | |
243 | switch (cmd) { | |
244 | default: | |
245 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp); | |
246 | break; | |
247 | } | |
248 | return (ret); | |
249 | } | |
d3442bc7 | 250 | |
6b691a5c | 251 | static int md_gets(BIO *bp, char *buf, int size) |
0f113f3e MC |
252 | { |
253 | EVP_MD_CTX *ctx; | |
254 | unsigned int ret; | |
d02b48c6 | 255 | |
0f113f3e MC |
256 | ctx = bp->ptr; |
257 | if (size < ctx->digest->md_size) | |
258 | return (0); | |
259 | if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0) | |
260 | return -1; | |
d02b48c6 | 261 | |
0f113f3e MC |
262 | return ((int)ret); |
263 | } | |
d02b48c6 | 264 | |
1d97c843 | 265 | /*- |
d02b48c6 RE |
266 | static int md_puts(bp,str) |
267 | BIO *bp; | |
268 | char *str; | |
0f113f3e MC |
269 | { |
270 | return(-1); | |
271 | } | |
d02b48c6 | 272 | */ |