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enc_read.c

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1/* $OpenBSD: enc_read.c,v 1.15 2015/02/12 03:54:07 jsing 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 <errno.h>-
60#include <stdio.h>-
61-
62#include <openssl/opensslconf.h>-
63-
64#include "des_locl.h"-
65-
66/* This has some uglies in it but it works - even over sockets. */-
67/*extern int errno;*/-
68int DES_rw_mode = DES_PCBC_MODE;-
69-
70/*-
71 * WARNINGS:-
72 *-
73 * - The data format used by DES_enc_write() and DES_enc_read()-
74 * has a cryptographic weakness: When asked to write more-
75 * than MAXWRITE bytes, DES_enc_write will split the data-
76 * into several chunks that are all encrypted-
77 * using the same IV. So don't use these functions unless you-
78 * are sure you know what you do (in which case you might-
79 * not want to use them anyway).-
80 *-
81 * - This code cannot handle non-blocking sockets.-
82 *-
83 * - This function uses an internal state and thus cannot be-
84 * used on multiple files.-
85 */-
86-
87-
88int DES_enc_read(int fd, void *buf, int len, DES_key_schedule *sched,-
89 DES_cblock *iv)-
90 {-
91 /* data to be unencrypted */-
92 int net_num=0;-
93 static unsigned char *net=NULL;-
94 /* extra unencrypted data -
95 * for when a block of 100 comes in but is des_read one byte at-
96 * a time. */-
97 static unsigned char *unnet=NULL;-
98 static int unnet_start=0;-
99 static int unnet_left=0;-
100 static unsigned char *tmpbuf=NULL;-
101 int i;-
102 long num=0,rnum;-
103 unsigned char *p;-
104-
105 if (tmpbuf == NULL)
tmpbuf == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
106 {-
107 tmpbuf=malloc(BSIZE);-
108 if (tmpbuf == NULL) return(-1);
never executed: return(-1);
tmpbuf == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
109 }
never executed: end of block
0
110 if (net == NULL)
net == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
111 {-
112 net=malloc(BSIZE);-
113 if (net == NULL) return(-1);
never executed: return(-1);
net == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
114 }
never executed: end of block
0
115 if (unnet == NULL)
unnet == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
116 {-
117 unnet=malloc(BSIZE);-
118 if (unnet == NULL) return(-1);
never executed: return(-1);
unnet == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
119 }
never executed: end of block
0
120 /* left over data from last decrypt */-
121 if (unnet_left != 0)
unnet_left != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
122 {-
123 if (unnet_left < len)
unnet_left < lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
124 {-
125 /* we still still need more data but will return-
126 * with the number of bytes we have - should always-
127 * check the return value */-
128 memcpy(buf,&(unnet[unnet_start]),-
129 unnet_left);-
130 /* eay 26/08/92 I had the next 2 lines-
131 * reversed :-( */-
132 i=unnet_left;-
133 unnet_start=unnet_left=0;-
134 }
never executed: end of block
0
135 else-
136 {-
137 memcpy(buf,&(unnet[unnet_start]),len);-
138 unnet_start+=len;-
139 unnet_left-=len;-
140 i=len;-
141 }
never executed: end of block
0
142 return(i);
never executed: return(i);
0
143 }-
144-
145 /* We need to get more data. */-
146 if (len > MAXWRITE) len=MAXWRITE;
never executed: len=(1024*16);
len > (1024*16)Description
TRUEnever evaluated
FALSEnever evaluated
0
147-
148 /* first - get the length */-
149 while (net_num < HDRSIZE)
net_num < 4Description
TRUEnever evaluated
FALSEnever evaluated
0
150 {-
151 i=read(fd,(void *)&(net[net_num]),HDRSIZE-net_num);-
152#ifdef EINTR-
153 if ((i == -1) && (errno == EINTR)) continue;
never executed: continue;
(i == -1)Description
TRUEnever evaluated
FALSEnever evaluated
( (*__errno_lo...ion ()) == 4 )Description
TRUEnever evaluated
FALSEnever evaluated
0
154#endif-
155 if (i <= 0) return(0);
never executed: return(0);
i <= 0Description
TRUEnever evaluated
FALSEnever evaluated
0
156 net_num+=i;-
157 }
never executed: end of block
0
158-
159 /* we now have at net_num bytes in net */-
160 p=net;-
161 /* num=0; */-
162 n2l(p,num);-
163 /* num should be rounded up to the next group of eight-
164 * we make sure that we have read a multiple of 8 bytes from the net.-
165 */-
166 if ((num > MAXWRITE) || (num < 0)) /* error */
(num > (1024*16))Description
TRUEnever evaluated
FALSEnever evaluated
(num < 0)Description
TRUEnever evaluated
FALSEnever evaluated
0
167 return(-1);
never executed: return(-1);
0
168 rnum=(num < 8)?8:((num+7)/8*8);
(num < 8)Description
TRUEnever evaluated
FALSEnever evaluated
0
169-
170 net_num=0;-
171 while (net_num < rnum)
net_num < rnumDescription
TRUEnever evaluated
FALSEnever evaluated
0
172 {-
173 i=read(fd,(void *)&(net[net_num]),rnum-net_num);-
174#ifdef EINTR-
175 if ((i == -1) && (errno == EINTR)) continue;
never executed: continue;
(i == -1)Description
TRUEnever evaluated
FALSEnever evaluated
( (*__errno_lo...ion ()) == 4 )Description
TRUEnever evaluated
FALSEnever evaluated
0
176#endif-
177 if (i <= 0) return(0);
never executed: return(0);
i <= 0Description
TRUEnever evaluated
FALSEnever evaluated
0
178 net_num+=i;-
179 }
never executed: end of block
0
180-
181 /* Check if there will be data left over. */-
182 if (len < num)
len < numDescription
TRUEnever evaluated
FALSEnever evaluated
0
183 {-
184 if (DES_rw_mode & DES_PCBC_MODE)
DES_rw_mode & 1Description
TRUEnever evaluated
FALSEnever evaluated
0
185 DES_pcbc_encrypt(net,unnet,num,sched,iv,DES_DECRYPT);
never executed: DES_pcbc_encrypt(net,unnet,num,sched,iv,0);
0
186 else-
187 DES_cbc_encrypt(net,unnet,num,sched,iv,DES_DECRYPT);
never executed: DES_cbc_encrypt(net,unnet,num,sched,iv,0);
0
188 memcpy(buf,unnet,len);-
189 unnet_start=len;-
190 unnet_left=num-len;-
191-
192 /* The following line is done because we return num-
193 * as the number of bytes read. */-
194 num=len;-
195 }
never executed: end of block
0
196 else-
197 {-
198 /* >output is a multiple of 8 byes, if len < rnum-
199 * >we must be careful. The user must be aware that this-
200 * >routine will write more bytes than he asked for.-
201 * >The length of the buffer must be correct.-
202 * FIXED - Should be ok now 18-9-90 - eay */-
203 if (len < rnum)
len < rnumDescription
TRUEnever evaluated
FALSEnever evaluated
0
204 {-
205-
206 if (DES_rw_mode & DES_PCBC_MODE)
DES_rw_mode & 1Description
TRUEnever evaluated
FALSEnever evaluated
0
207 DES_pcbc_encrypt(net,tmpbuf,num,sched,iv,
never executed: DES_pcbc_encrypt(net,tmpbuf,num,sched,iv, 0);
0
208 DES_DECRYPT);
never executed: DES_pcbc_encrypt(net,tmpbuf,num,sched,iv, 0);
0
209 else-
210 DES_cbc_encrypt(net,tmpbuf,num,sched,iv,
never executed: DES_cbc_encrypt(net,tmpbuf,num,sched,iv, 0);
0
211 DES_DECRYPT);
never executed: DES_cbc_encrypt(net,tmpbuf,num,sched,iv, 0);
0
212-
213 /* eay 26/08/92 fix a bug that returned more-
214 * bytes than you asked for (returned len bytes :-( */-
215 memcpy(buf,tmpbuf,num);-
216 }
never executed: end of block
0
217 else-
218 {-
219 if (DES_rw_mode & DES_PCBC_MODE)
DES_rw_mode & 1Description
TRUEnever evaluated
FALSEnever evaluated
0
220 DES_pcbc_encrypt(net,buf,num,sched,iv,
never executed: DES_pcbc_encrypt(net,buf,num,sched,iv, 0);
0
221 DES_DECRYPT);
never executed: DES_pcbc_encrypt(net,buf,num,sched,iv, 0);
0
222 else-
223 DES_cbc_encrypt(net,buf,num,sched,iv,
never executed: DES_cbc_encrypt(net,buf,num,sched,iv, 0);
0
224 DES_DECRYPT);
never executed: DES_cbc_encrypt(net,buf,num,sched,iv, 0);
0
225 }-
226 }-
227 return num;
never executed: return num;
0
228 }-
229-
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