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1/* crypto/des/enc_read.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 "des_locl.h"
63
64/* This has some uglies in it but it works - even over sockets. */
65/*extern int errno;*/
66OPENSSL_IMPLEMENT_GLOBAL(int,DES_rw_mode)=DES_PCBC_MODE;
67
68
69/*
70 * WARNINGS:
71 *
72 * - The data format used by DES_enc_write() and DES_enc_read()
73 * has a cryptographic weakness: When asked to write more
74 * than MAXWRITE bytes, DES_enc_write will split the data
75 * into several chunks that are all encrypted
76 * using the same IV. So don't use these functions unless you
77 * are sure you know what you do (in which case you might
78 * not want to use them anyway).
79 *
80 * - This code cannot handle non-blocking sockets.
81 *
82 * - This function uses an internal state and thus cannot be
83 * used on multiple files.
84 */
85
86
87int DES_enc_read(int fd, void *buf, int len, DES_key_schedule *sched,
88 DES_cblock *iv)
89 {
90 /* data to be unencrypted */
91 int net_num=0;
92 static unsigned char *net=NULL;
93 /* extra unencrypted data
94 * for when a block of 100 comes in but is des_read one byte at
95 * a time. */
96 static unsigned char *unnet=NULL;
97 static int unnet_start=0;
98 static int unnet_left=0;
99 static unsigned char *tmpbuf=NULL;
100 int i;
101 long num=0,rnum;
102 unsigned char *p;
103
104 if (tmpbuf == NULL)
105 {
106 tmpbuf=OPENSSL_malloc(BSIZE);
107 if (tmpbuf == NULL) return(-1);
108 }
109 if (net == NULL)
110 {
111 net=OPENSSL_malloc(BSIZE);
112 if (net == NULL) return(-1);
113 }
114 if (unnet == NULL)
115 {
116 unnet=OPENSSL_malloc(BSIZE);
117 if (unnet == NULL) return(-1);
118 }
119 /* left over data from last decrypt */
120 if (unnet_left != 0)
121 {
122 if (unnet_left < len)
123 {
124 /* we still still need more data but will return
125 * with the number of bytes we have - should always
126 * check the return value */
127 memcpy(buf,&(unnet[unnet_start]),
128 unnet_left);
129 /* eay 26/08/92 I had the next 2 lines
130 * reversed :-( */
131 i=unnet_left;
132 unnet_start=unnet_left=0;
133 }
134 else
135 {
136 memcpy(buf,&(unnet[unnet_start]),len);
137 unnet_start+=len;
138 unnet_left-=len;
139 i=len;
140 }
141 return(i);
142 }
143
144 /* We need to get more data. */
145 if (len > MAXWRITE) len=MAXWRITE;
146
147 /* first - get the length */
148 while (net_num < HDRSIZE)
149 {
150#ifndef _WIN32
151 i=read(fd,(void *)&(net[net_num]),HDRSIZE-net_num);
152#else
153 i=_read(fd,(void *)&(net[net_num]),HDRSIZE-net_num);
154#endif
155#ifdef EINTR
156 if ((i == -1) && (errno == EINTR)) continue;
157#endif
158 if (i <= 0) return(0);
159 net_num+=i;
160 }
161
162 /* we now have at net_num bytes in net */
163 p=net;
164 /* num=0; */
165 n2l(p,num);
166 /* num should be rounded up to the next group of eight
167 * we make sure that we have read a multiple of 8 bytes from the net.
168 */
169 if ((num > MAXWRITE) || (num < 0)) /* error */
170 return(-1);
171 rnum=(num < 8)?8:((num+7)/8*8);
172
173 net_num=0;
174 while (net_num < rnum)
175 {
176 i=read(fd,(void *)&(net[net_num]),rnum-net_num);
177#ifdef EINTR
178 if ((i == -1) && (errno == EINTR)) continue;
179#endif
180 if (i <= 0) return(0);
181 net_num+=i;
182 }
183
184 /* Check if there will be data left over. */
185 if (len < num)
186 {
187 if (DES_rw_mode & DES_PCBC_MODE)
188 DES_pcbc_encrypt(net,unnet,num,sched,iv,DES_DECRYPT);
189 else
190 DES_cbc_encrypt(net,unnet,num,sched,iv,DES_DECRYPT);
191 memcpy(buf,unnet,len);
192 unnet_start=len;
193 unnet_left=num-len;
194
195 /* The following line is done because we return num
196 * as the number of bytes read. */
197 num=len;
198 }
199 else
200 {
201 /* >output is a multiple of 8 byes, if len < rnum
202 * >we must be careful. The user must be aware that this
203 * >routine will write more bytes than he asked for.
204 * >The length of the buffer must be correct.
205 * FIXED - Should be ok now 18-9-90 - eay */
206 if (len < rnum)
207 {
208
209 if (DES_rw_mode & DES_PCBC_MODE)
210 DES_pcbc_encrypt(net,tmpbuf,num,sched,iv,
211 DES_DECRYPT);
212 else
213 DES_cbc_encrypt(net,tmpbuf,num,sched,iv,
214 DES_DECRYPT);
215
216 /* eay 26/08/92 fix a bug that returned more
217 * bytes than you asked for (returned len bytes :-( */
218 memcpy(buf,tmpbuf,num);
219 }
220 else
221 {
222 if (DES_rw_mode & DES_PCBC_MODE)
223 DES_pcbc_encrypt(net,buf,num,sched,iv,
224 DES_DECRYPT);
225 else
226 DES_cbc_encrypt(net,buf,num,sched,iv,
227 DES_DECRYPT);
228 }
229 }
230 return num;
231 }
232
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