Line data Source code
1 : /* crypto/evp/bio_md.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
8 : *
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).
15 : *
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.
22 : *
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 :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
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.
52 : *
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>
61 : #include "cryptlib.h"
62 : #include <openssl/buffer.h>
63 : #include <openssl/evp.h>
64 :
65 : /*
66 : * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
67 : */
68 :
69 : static int md_write(BIO *h, char const *buf, int num);
70 : static int md_read(BIO *h, char *buf, int size);
71 : /*
72 : * static int md_puts(BIO *h, const char *str);
73 : */
74 : static int md_gets(BIO *h, char *str, int size);
75 : static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
76 : static int md_new(BIO *h);
77 : static int md_free(BIO *data);
78 : static long md_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
79 :
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 : };
91 :
92 0 : BIO_METHOD *BIO_f_md(void)
93 : {
94 0 : return (&methods_md);
95 : }
96 :
97 0 : static int md_new(BIO *bi)
98 : {
99 : EVP_MD_CTX *ctx;
100 :
101 0 : ctx = EVP_MD_CTX_create();
102 0 : if (ctx == NULL)
103 : return (0);
104 :
105 0 : bi->init = 0;
106 0 : bi->ptr = (char *)ctx;
107 0 : bi->flags = 0;
108 0 : return (1);
109 : }
110 :
111 0 : static int md_free(BIO *a)
112 : {
113 0 : if (a == NULL)
114 : return (0);
115 0 : EVP_MD_CTX_destroy(a->ptr);
116 0 : a->ptr = NULL;
117 0 : a->init = 0;
118 0 : a->flags = 0;
119 0 : return (1);
120 : }
121 :
122 0 : static int md_read(BIO *b, char *out, int outl)
123 : {
124 : int ret = 0;
125 : EVP_MD_CTX *ctx;
126 :
127 0 : if (out == NULL)
128 : return (0);
129 0 : ctx = b->ptr;
130 :
131 0 : if ((ctx == NULL) || (b->next_bio == NULL))
132 : return (0);
133 :
134 0 : ret = BIO_read(b->next_bio, out, outl);
135 0 : if (b->init) {
136 0 : if (ret > 0) {
137 0 : if (EVP_DigestUpdate(ctx, (unsigned char *)out,
138 0 : (unsigned int)ret) <= 0)
139 : return (-1);
140 : }
141 : }
142 0 : BIO_clear_retry_flags(b);
143 0 : BIO_copy_next_retry(b);
144 0 : return (ret);
145 : }
146 :
147 0 : static int md_write(BIO *b, const char *in, int inl)
148 : {
149 : int ret = 0;
150 : EVP_MD_CTX *ctx;
151 :
152 0 : if ((in == NULL) || (inl <= 0))
153 : return (0);
154 0 : ctx = b->ptr;
155 :
156 0 : if ((ctx != NULL) && (b->next_bio != NULL))
157 0 : ret = BIO_write(b->next_bio, in, inl);
158 0 : if (b->init) {
159 0 : if (ret > 0) {
160 0 : if (!EVP_DigestUpdate(ctx, (const unsigned char *)in,
161 0 : (unsigned int)ret)) {
162 0 : BIO_clear_retry_flags(b);
163 0 : return 0;
164 : }
165 : }
166 : }
167 0 : if (b->next_bio != NULL) {
168 0 : BIO_clear_retry_flags(b);
169 0 : BIO_copy_next_retry(b);
170 : }
171 0 : return (ret);
172 : }
173 :
174 0 : static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
175 : {
176 : EVP_MD_CTX *ctx, *dctx, **pctx;
177 : const EVP_MD **ppmd;
178 : EVP_MD *md;
179 : long ret = 1;
180 : BIO *dbio;
181 :
182 0 : ctx = b->ptr;
183 :
184 0 : switch (cmd) {
185 : case BIO_CTRL_RESET:
186 0 : if (b->init)
187 0 : ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL);
188 : else
189 : ret = 0;
190 0 : if (ret > 0)
191 0 : ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
192 : break;
193 : case BIO_C_GET_MD:
194 0 : if (b->init) {
195 : ppmd = ptr;
196 0 : *ppmd = ctx->digest;
197 : } else
198 : ret = 0;
199 : break;
200 : case BIO_C_GET_MD_CTX:
201 : pctx = ptr;
202 0 : *pctx = ctx;
203 0 : b->init = 1;
204 0 : break;
205 : case BIO_C_SET_MD_CTX:
206 0 : if (b->init)
207 0 : b->ptr = ptr;
208 : else
209 : ret = 0;
210 : break;
211 : case BIO_C_DO_STATE_MACHINE:
212 0 : BIO_clear_retry_flags(b);
213 0 : ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
214 0 : BIO_copy_next_retry(b);
215 0 : break;
216 :
217 : case BIO_C_SET_MD:
218 : md = ptr;
219 0 : ret = EVP_DigestInit_ex(ctx, md, NULL);
220 0 : if (ret > 0)
221 0 : b->init = 1;
222 : break;
223 : case BIO_CTRL_DUP:
224 : dbio = ptr;
225 0 : dctx = dbio->ptr;
226 0 : if (!EVP_MD_CTX_copy_ex(dctx, ctx))
227 : return 0;
228 0 : b->init = 1;
229 0 : break;
230 : default:
231 0 : ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
232 0 : break;
233 : }
234 0 : return (ret);
235 : }
236 :
237 0 : static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
238 : {
239 : long ret = 1;
240 :
241 0 : if (b->next_bio == NULL)
242 : return (0);
243 : switch (cmd) {
244 : default:
245 0 : ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
246 : break;
247 : }
248 0 : return (ret);
249 : }
250 :
251 0 : static int md_gets(BIO *bp, char *buf, int size)
252 : {
253 : EVP_MD_CTX *ctx;
254 : unsigned int ret;
255 :
256 0 : ctx = bp->ptr;
257 0 : if (size < ctx->digest->md_size)
258 : return (0);
259 0 : if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0)
260 : return -1;
261 :
262 0 : return ((int)ret);
263 : }
264 :
265 : /*-
266 : static int md_puts(bp,str)
267 : BIO *bp;
268 : char *str;
269 : {
270 : return(-1);
271 : }
272 : */
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