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diff --git a/src/lib/libcrypto/evp/bio_md.c b/src/lib/libcrypto/evp/bio_md.c
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1/* $OpenBSD: bio_md.c,v 1.22 2024/04/09 13:52:41 beck Exp $ */
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
62#include <openssl/buffer.h>
63#include <openssl/evp.h>
64
65#include "bio_local.h"
66#include "evp_local.h"
67
68/* BIO_put and BIO_get both add to the digest,
69 * BIO_gets returns the digest */
70
71static int md_write(BIO *h, char const *buf, int num);
72static int md_read(BIO *h, char *buf, int size);
73/*static int md_puts(BIO *h, const char *str); */
74static int md_gets(BIO *h, char *str, int size);
75static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
76static int md_new(BIO *h);
77static int md_free(BIO *data);
78static long md_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
79
80static const BIO_METHOD methods_md = {
81 .type = BIO_TYPE_MD,
82 .name = "message digest",
83 .bwrite = md_write,
84 .bread = md_read,
85 .bgets = md_gets,
86 .ctrl = md_ctrl,
87 .create = md_new,
88 .destroy = md_free,
89 .callback_ctrl = md_callback_ctrl
90};
91
92const BIO_METHOD *
93BIO_f_md(void)
94{
95 return (&methods_md);
96}
97LCRYPTO_ALIAS(BIO_f_md);
98
99static int
100md_new(BIO *bi)
101{
102 EVP_MD_CTX *ctx;
103
104 ctx = EVP_MD_CTX_create();
105 if (ctx == NULL)
106 return (0);
107
108 bi->init = 0;
109 bi->ptr = (char *)ctx;
110 bi->flags = 0;
111 return (1);
112}
113
114static int
115md_free(BIO *a)
116{
117 if (a == NULL)
118 return (0);
119 EVP_MD_CTX_destroy(a->ptr);
120 a->ptr = NULL;
121 a->init = 0;
122 a->flags = 0;
123 return (1);
124}
125
126static int
127md_read(BIO *b, char *out, int outl)
128{
129 int ret = 0;
130 EVP_MD_CTX *ctx;
131
132 if (out == NULL)
133 return (0);
134 ctx = b->ptr;
135
136 if ((ctx == NULL) || (b->next_bio == NULL))
137 return (0);
138
139 ret = BIO_read(b->next_bio, out, outl);
140 if (b->init) {
141 if (ret > 0) {
142 if (EVP_DigestUpdate(ctx, (unsigned char *)out,
143 (unsigned int)ret) <= 0)
144 return (-1);
145 }
146 }
147 BIO_clear_retry_flags(b);
148 BIO_copy_next_retry(b);
149 return (ret);
150}
151
152static int
153md_write(BIO *b, const char *in, int inl)
154{
155 int ret = 0;
156 EVP_MD_CTX *ctx;
157
158 if ((in == NULL) || (inl <= 0))
159 return (0);
160 ctx = b->ptr;
161
162 if ((ctx != NULL) && (b->next_bio != NULL))
163 ret = BIO_write(b->next_bio, in, inl);
164 if (b->init) {
165 if (ret > 0) {
166 if (!EVP_DigestUpdate(ctx, (const unsigned char *)in,
167 (unsigned int)ret)) {
168 BIO_clear_retry_flags(b);
169 return 0;
170 }
171 }
172 }
173 if (b->next_bio != NULL) {
174 BIO_clear_retry_flags(b);
175 BIO_copy_next_retry(b);
176 }
177 return (ret);
178}
179
180static long
181md_ctrl(BIO *b, int cmd, long num, void *ptr)
182{
183 EVP_MD_CTX *ctx, *dctx, **pctx;
184 const EVP_MD **ppmd;
185 EVP_MD *md;
186 long ret = 1;
187 BIO *dbio;
188
189 ctx = b->ptr;
190
191 switch (cmd) {
192 case BIO_CTRL_RESET:
193 if (b->init)
194 ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL);
195 else
196 ret = 0;
197 if (ret > 0)
198 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
199 break;
200 case BIO_C_GET_MD:
201 if (b->init) {
202 ppmd = ptr;
203 *ppmd = ctx->digest;
204 } else
205 ret = 0;
206 break;
207 case BIO_C_GET_MD_CTX:
208 pctx = ptr;
209 *pctx = ctx;
210 b->init = 1;
211 break;
212 case BIO_C_SET_MD_CTX:
213 if (b->init)
214 b->ptr = ptr;
215 else
216 ret = 0;
217 break;
218 case BIO_C_DO_STATE_MACHINE:
219 BIO_clear_retry_flags(b);
220 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
221 BIO_copy_next_retry(b);
222 break;
223
224 case BIO_C_SET_MD:
225 md = ptr;
226 ret = EVP_DigestInit_ex(ctx, md, NULL);
227 if (ret > 0)
228 b->init = 1;
229 break;
230 case BIO_CTRL_DUP:
231 dbio = ptr;
232 dctx = dbio->ptr;
233 if (!EVP_MD_CTX_copy_ex(dctx, ctx))
234 return 0;
235 b->init = 1;
236 break;
237 default:
238 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
239 break;
240 }
241 return (ret);
242}
243
244static long
245md_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
246{
247 long ret = 1;
248
249 if (b->next_bio == NULL)
250 return (0);
251 switch (cmd) {
252 default:
253 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
254 break;
255 }
256 return (ret);
257}
258
259static int
260md_gets(BIO *bp, char *buf, int size)
261{
262 EVP_MD_CTX *ctx;
263 unsigned int ret;
264
265 ctx = bp->ptr;
266 if (size < ctx->digest->md_size)
267 return (0);
268 if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0)
269 return -1;
270
271 return ((int)ret);
272}
273
274/*
275static int md_puts(bp,str)
276BIO *bp;
277char *str;
278 {
279 return(-1);
280 }
281*/
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 15:13:17 +0000