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d02b48c6 | 1 | /* crypto/des/enc_writ.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
ae5c8664 | 8 | * |
d02b48c6 RE |
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). | |
ae5c8664 | 15 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 22 | * |
d02b48c6 RE |
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 :-). | |
ae5c8664 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 40 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 52 | * |
d02b48c6 RE |
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 <time.h> | |
199d59e5 DSH |
61 | #include <stdio.h> |
62 | #include "cryptlib.h" | |
d02b48c6 | 63 | #include "des_locl.h" |
cfa3747b | 64 | #include <openssl/rand.h> |
d02b48c6 | 65 | |
6977c7e2 | 66 | /*- |
7c0f3d09 BM |
67 | * WARNINGS: |
68 | * | |
c2e4f17c | 69 | * - The data format used by DES_enc_write() and DES_enc_read() |
7c0f3d09 | 70 | * has a cryptographic weakness: When asked to write more |
c2e4f17c | 71 | * than MAXWRITE bytes, DES_enc_write will split the data |
7c0f3d09 BM |
72 | * into several chunks that are all encrypted |
73 | * using the same IV. So don't use these functions unless you | |
74 | * are sure you know what you do (in which case you might | |
75 | * not want to use them anyway). | |
76 | * | |
77 | * - This code cannot handle non-blocking sockets. | |
78 | */ | |
79 | ||
c2e4f17c | 80 | int DES_enc_write(int fd, const void *_buf, int len, |
ae5c8664 MC |
81 | DES_key_schedule *sched, DES_cblock *iv) |
82 | { | |
1715e488 | 83 | #if defined(OPENSSL_NO_POSIX_IO) |
ae5c8664 | 84 | return (-1); |
1715e488 | 85 | #else |
ae5c8664 MC |
86 | # ifdef _LIBC |
87 | extern unsigned long time(); | |
88 | extern int write(); | |
89 | # endif | |
90 | const unsigned char *buf = _buf; | |
91 | long rnum; | |
92 | int i, j, k, outnum; | |
93 | static unsigned char *outbuf = NULL; | |
94 | unsigned char shortbuf[8]; | |
95 | unsigned char *p; | |
96 | const unsigned char *cp; | |
97 | static int start = 1; | |
d02b48c6 | 98 | |
ae5c8664 MC |
99 | if (outbuf == NULL) { |
100 | outbuf = OPENSSL_malloc(BSIZE + HDRSIZE); | |
101 | if (outbuf == NULL) | |
102 | return (-1); | |
103 | } | |
104 | /* | |
105 | * If we are sending less than 8 bytes, the same char will look the same | |
106 | * if we don't pad it out with random bytes | |
107 | */ | |
108 | if (start) { | |
109 | start = 0; | |
110 | } | |
d02b48c6 | 111 | |
ae5c8664 MC |
112 | /* lets recurse if we want to send the data in small chunks */ |
113 | if (len > MAXWRITE) { | |
114 | j = 0; | |
115 | for (i = 0; i < len; i += k) { | |
116 | k = DES_enc_write(fd, &(buf[i]), | |
117 | ((len - i) > MAXWRITE) ? MAXWRITE : (len - i), | |
118 | sched, iv); | |
119 | if (k < 0) | |
120 | return (k); | |
121 | else | |
122 | j += k; | |
123 | } | |
124 | return (j); | |
125 | } | |
d02b48c6 | 126 | |
ae5c8664 MC |
127 | /* write length first */ |
128 | p = outbuf; | |
129 | l2n(len, p); | |
d02b48c6 | 130 | |
ae5c8664 MC |
131 | /* pad short strings */ |
132 | if (len < 8) { | |
133 | cp = shortbuf; | |
134 | memcpy(shortbuf, buf, len); | |
3b38646d | 135 | if (RAND_pseudo_bytes(shortbuf + len, 8 - len) < 0) { |
8f8e4e4f MC |
136 | return -1; |
137 | } | |
ae5c8664 MC |
138 | rnum = 8; |
139 | } else { | |
140 | cp = buf; | |
141 | rnum = ((len + 7) / 8 * 8); /* round up to nearest eight */ | |
142 | } | |
d02b48c6 | 143 | |
ae5c8664 MC |
144 | if (DES_rw_mode & DES_PCBC_MODE) |
145 | DES_pcbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched, | |
146 | iv, DES_ENCRYPT); | |
147 | else | |
148 | DES_cbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched, | |
149 | iv, DES_ENCRYPT); | |
d02b48c6 | 150 | |
ae5c8664 MC |
151 | /* output */ |
152 | outnum = rnum + HDRSIZE; | |
d02b48c6 | 153 | |
ae5c8664 MC |
154 | for (j = 0; j < outnum; j += i) { |
155 | /* | |
156 | * eay 26/08/92 I was not doing writing from where we got up to. | |
157 | */ | |
158 | # ifndef _WIN32 | |
159 | i = write(fd, (void *)&(outbuf[j]), outnum - j); | |
160 | # else | |
161 | i = _write(fd, (void *)&(outbuf[j]), outnum - j); | |
162 | # endif | |
163 | if (i == -1) { | |
164 | # ifdef EINTR | |
165 | if (errno == EINTR) | |
166 | i = 0; | |
167 | else | |
168 | # endif | |
169 | /* | |
170 | * This is really a bad error - very bad It will stuff-up | |
171 | * both ends. | |
172 | */ | |
173 | return (-1); | |
174 | } | |
175 | } | |
d02b48c6 | 176 | |
ae5c8664 MC |
177 | return (len); |
178 | #endif /* OPENSSL_NO_POSIX_IO */ | |
179 | } |