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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
d02b48c6 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
d02b48c6 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
59 | #include <errno.h> | |
b39fc560 | 60 | #include "internal/cryptlib.h" |
d02b48c6 RE |
61 | #include "des_locl.h" |
62 | ||
63 | /* This has some uglies in it but it works - even over sockets. */ | |
0f113f3e MC |
64 | /* |
65 | * extern int errno; | |
66 | */ | |
67 | OPENSSL_IMPLEMENT_GLOBAL(int, DES_rw_mode, DES_PCBC_MODE) | |
7c0f3d09 | 68 | |
1d97c843 | 69 | /*- |
7c0f3d09 BM |
70 | * WARNINGS: |
71 | * | |
c2e4f17c | 72 | * - The data format used by DES_enc_write() and DES_enc_read() |
7c0f3d09 | 73 | * has a cryptographic weakness: When asked to write more |
c2e4f17c | 74 | * than MAXWRITE bytes, DES_enc_write will split the data |
7c0f3d09 BM |
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 | */ | |
c2e4f17c | 85 | int DES_enc_read(int fd, void *buf, int len, DES_key_schedule *sched, |
0f113f3e MC |
86 | DES_cblock *iv) |
87 | { | |
1715e488 | 88 | #if defined(OPENSSL_NO_POSIX_IO) |
0f113f3e | 89 | return (0); |
1715e488 | 90 | #else |
0f113f3e MC |
91 | /* data to be unencrypted */ |
92 | int net_num = 0; | |
93 | static unsigned char *net = NULL; | |
94 | /* | |
95 | * extra unencrypted data for when a block of 100 comes in but is | |
96 | * des_read one byte at a time. | |
97 | */ | |
98 | static unsigned char *unnet = NULL; | |
99 | static int unnet_start = 0; | |
100 | static int unnet_left = 0; | |
101 | static unsigned char *tmpbuf = NULL; | |
102 | int i; | |
103 | long num = 0, rnum; | |
104 | unsigned char *p; | |
105 | ||
106 | if (tmpbuf == NULL) { | |
107 | tmpbuf = OPENSSL_malloc(BSIZE); | |
108 | if (tmpbuf == NULL) | |
109 | return (-1); | |
110 | } | |
111 | if (net == NULL) { | |
112 | net = OPENSSL_malloc(BSIZE); | |
113 | if (net == NULL) | |
114 | return (-1); | |
115 | } | |
116 | if (unnet == NULL) { | |
117 | unnet = OPENSSL_malloc(BSIZE); | |
118 | if (unnet == NULL) | |
119 | return (-1); | |
120 | } | |
121 | /* left over data from last decrypt */ | |
122 | if (unnet_left != 0) { | |
123 | if (unnet_left < len) { | |
124 | /* | |
125 | * we still still need more data but will return with the number | |
126 | * of bytes we have - should always check the return value | |
127 | */ | |
128 | memcpy(buf, &(unnet[unnet_start]), unnet_left); | |
129 | /* | |
130 | * eay 26/08/92 I had the next 2 lines reversed :-( | |
131 | */ | |
132 | i = unnet_left; | |
133 | unnet_start = unnet_left = 0; | |
134 | } else { | |
135 | memcpy(buf, &(unnet[unnet_start]), len); | |
136 | unnet_start += len; | |
137 | unnet_left -= len; | |
138 | i = len; | |
139 | } | |
140 | return (i); | |
141 | } | |
142 | ||
143 | /* We need to get more data. */ | |
144 | if (len > MAXWRITE) | |
145 | len = MAXWRITE; | |
146 | ||
147 | /* first - get the length */ | |
148 | while (net_num < HDRSIZE) { | |
149 | # ifndef OPENSSL_SYS_WIN32 | |
150 | i = read(fd, (void *)&(net[net_num]), HDRSIZE - net_num); | |
151 | # else | |
152 | i = _read(fd, (void *)&(net[net_num]), HDRSIZE - net_num); | |
153 | # endif | |
154 | # ifdef EINTR | |
155 | if ((i == -1) && (errno == EINTR)) | |
156 | continue; | |
157 | # endif | |
158 | if (i <= 0) | |
159 | return (0); | |
160 | net_num += i; | |
161 | } | |
162 | ||
163 | /* we now have at net_num bytes in net */ | |
164 | p = net; | |
165 | /* num=0; */ | |
166 | n2l(p, num); | |
167 | /* | |
168 | * num should be rounded up to the next group of eight we make sure that | |
169 | * we have read a multiple of 8 bytes from the net. | |
170 | */ | |
171 | if ((num > MAXWRITE) || (num < 0)) /* error */ | |
172 | return (-1); | |
173 | rnum = (num < 8) ? 8 : ((num + 7) / 8 * 8); | |
174 | ||
175 | net_num = 0; | |
176 | while (net_num < rnum) { | |
177 | # ifndef OPENSSL_SYS_WIN32 | |
178 | i = read(fd, (void *)&(net[net_num]), rnum - net_num); | |
179 | # else | |
180 | i = _read(fd, (void *)&(net[net_num]), rnum - net_num); | |
181 | # endif | |
182 | # ifdef EINTR | |
183 | if ((i == -1) && (errno == EINTR)) | |
184 | continue; | |
185 | # endif | |
186 | if (i <= 0) | |
187 | return (0); | |
188 | net_num += i; | |
189 | } | |
190 | ||
191 | /* Check if there will be data left over. */ | |
192 | if (len < num) { | |
193 | if (DES_rw_mode & DES_PCBC_MODE) | |
194 | DES_pcbc_encrypt(net, unnet, num, sched, iv, DES_DECRYPT); | |
195 | else | |
196 | DES_cbc_encrypt(net, unnet, num, sched, iv, DES_DECRYPT); | |
197 | memcpy(buf, unnet, len); | |
198 | unnet_start = len; | |
199 | unnet_left = num - len; | |
200 | ||
201 | /* | |
202 | * The following line is done because we return num as the number of | |
203 | * bytes read. | |
204 | */ | |
205 | num = len; | |
206 | } else { | |
35a1cc90 MC |
207 | /*- |
208 | * >output is a multiple of 8 byes, if len < rnum | |
209 | * >we must be careful. The user must be aware that this | |
210 | * >routine will write more bytes than he asked for. | |
211 | * >The length of the buffer must be correct. | |
212 | * FIXED - Should be ok now 18-9-90 - eay */ | |
0f113f3e MC |
213 | if (len < rnum) { |
214 | ||
215 | if (DES_rw_mode & DES_PCBC_MODE) | |
216 | DES_pcbc_encrypt(net, tmpbuf, num, sched, iv, DES_DECRYPT); | |
217 | else | |
218 | DES_cbc_encrypt(net, tmpbuf, num, sched, iv, DES_DECRYPT); | |
219 | ||
220 | /* | |
221 | * eay 26/08/92 fix a bug that returned more bytes than you asked | |
222 | * for (returned len bytes :-( | |
223 | */ | |
224 | memcpy(buf, tmpbuf, num); | |
225 | } else { | |
226 | if (DES_rw_mode & DES_PCBC_MODE) | |
227 | DES_pcbc_encrypt(net, buf, num, sched, iv, DES_DECRYPT); | |
228 | else | |
229 | DES_cbc_encrypt(net, buf, num, sched, iv, DES_DECRYPT); | |
230 | } | |
231 | } | |
232 | return num; | |
233 | #endif /* OPENSSL_NO_POSIX_IO */ | |
234 | } |