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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 "buffer.h"
63#include "evp.h"
64
65/* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
67
68#ifndef NOPROTO
69static int md_write(BIO *h,char *buf,int num);
70static int md_read(BIO *h,char *buf,int size);
71/*static int md_puts(BIO *h,char *str); */
72static int md_gets(BIO *h,char *str,int size);
73static long md_ctrl(BIO *h,int cmd,long arg1,char *arg2);
74static int md_new(BIO *h);
75static int md_free(BIO *data);
76#else
77static int md_write();
78static int md_read();
79/*static int md_puts(); */
80static int md_gets();
81static long md_ctrl();
82static int md_new();
83static int md_free();
84#endif
85
86static BIO_METHOD methods_md=
87 {
88 BIO_TYPE_MD,"message digest",
89 md_write,
90 md_read,
91 NULL, /* md_puts, */
92 md_gets,
93 md_ctrl,
94 md_new,
95 md_free,
96 };
97
98BIO_METHOD *BIO_f_md()
99 {
100 return(&methods_md);
101 }
102
103static int md_new(bi)
104BIO *bi;
105 {
106 EVP_MD_CTX *ctx;
107
108 ctx=(EVP_MD_CTX *)Malloc(sizeof(EVP_MD_CTX));
109 if (ctx == NULL) return(0);
110
111 bi->init=0;
112 bi->ptr=(char *)ctx;
113 bi->flags=0;
114 return(1);
115 }
116
117static int md_free(a)
118BIO *a;
119 {
120 if (a == NULL) return(0);
121 Free(a->ptr);
122 a->ptr=NULL;
123 a->init=0;
124 a->flags=0;
125 return(1);
126 }
127
128static int md_read(b,out,outl)
129BIO *b;
130char *out;
131int outl;
132 {
133 int ret=0;
134 EVP_MD_CTX *ctx;
135
136 if (out == NULL) return(0);
137 ctx=(EVP_MD_CTX *)b->ptr;
138
139 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
140
141 ret=BIO_read(b->next_bio,out,outl);
142 if (b->init)
143 {
144 if (ret > 0)
145 {
146 EVP_DigestUpdate(ctx,(unsigned char *)out,
147 (unsigned int)ret);
148 }
149 }
150 BIO_clear_retry_flags(b);
151 BIO_copy_next_retry(b);
152 return(ret);
153 }
154
155static int md_write(b,in,inl)
156BIO *b;
157char *in;
158int inl;
159 {
160 int ret=0;
161 EVP_MD_CTX *ctx;
162
163 if ((in == NULL) || (inl <= 0)) return(0);
164 ctx=(EVP_MD_CTX *)b->ptr;
165
166 if ((ctx != NULL) && (b->next_bio != NULL))
167 ret=BIO_write(b->next_bio,in,inl);
168 if (b->init)
169 {
170 if (ret > 0)
171 {
172 EVP_DigestUpdate(ctx,(unsigned char *)in,
173 (unsigned int)ret);
174 }
175 }
176 BIO_clear_retry_flags(b);
177 BIO_copy_next_retry(b);
178 return(ret);
179 }
180
181static long md_ctrl(b,cmd,num,ptr)
182BIO *b;
183int cmd;
184long num;
185char *ptr;
186 {
187 EVP_MD_CTX *ctx,*dctx,**pctx;
188 EVP_MD **ppmd;
189 EVP_MD *md;
190 long ret=1;
191 BIO *dbio;
192
193 ctx=(EVP_MD_CTX *)b->ptr;
194
195 switch (cmd)
196 {
197 case BIO_CTRL_RESET:
198 if (b->init)
199 EVP_DigestInit(ctx,ctx->digest);
200 else
201 ret=0;
202 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
203 break;
204 case BIO_C_GET_MD:
205 if (b->init)
206 {
207 ppmd=(EVP_MD **)ptr;
208 *ppmd=ctx->digest;
209 }
210 else
211 ret=0;
212 break;
213 case BIO_C_GET_MD_CTX:
214 if (b->init)
215 {
216 pctx=(EVP_MD_CTX **)ptr;
217 *pctx=ctx;
218 }
219 else
220 ret=0;
221 break;
222 case BIO_C_DO_STATE_MACHINE:
223 BIO_clear_retry_flags(b);
224 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
225 BIO_copy_next_retry(b);
226 break;
227
228 case BIO_C_SET_MD:
229 md=(EVP_MD *)ptr;
230 EVP_DigestInit(ctx,md);
231 b->init=1;
232 break;
233 case BIO_CTRL_DUP:
234 dbio=(BIO *)ptr;
235 dctx=(EVP_MD_CTX *)dbio->ptr;
236 memcpy(dctx,ctx,sizeof(ctx));
237 b->init=1;
238 break;
239 default:
240 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
241 break;
242 }
243 return(ret);
244 }
245
246static int md_gets(bp,buf,size)
247BIO *bp;
248char *buf;
249int size;
250 {
251 EVP_MD_CTX *ctx;
252 unsigned int ret;
253
254
255 ctx=(EVP_MD_CTX *)bp->ptr;
256 if (size < ctx->digest->md_size)
257 return(0);
258 EVP_DigestFinal(ctx,(unsigned char *)buf,&ret);
259 return((int)ret);
260 }
261
262/*
263static int md_puts(bp,str)
264BIO *bp;
265char *str;
266 {
267 return(-1);
268 }
269*/
270
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