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1 /* crypto/des/enc_writ.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 <errno.h> | |
60 #include <time.h> | |
61 #include <stdio.h> | |
62 #include "cryptlib.h" | |
63 #include "des_locl.h" | |
64 #include <openssl/rand.h> | |
65 | |
66 /* | |
67 * WARNINGS: | |
68 * | |
69 * - The data format used by DES_enc_write() and DES_enc_read() | |
70 * has a cryptographic weakness: When asked to write more | |
71 * than MAXWRITE bytes, DES_enc_write will split the data | |
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 | |
80 int DES_enc_write(int fd, const void *_buf, int len, | |
81 DES_key_schedule *sched, DES_cblock *iv) | |
82 { | |
83 #if defined(OPENSSL_NO_POSIX_IO) | |
84 return (-1); | |
85 #else | |
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; | |
98 | |
99 if (outbuf == NULL) | |
100 { | |
101 outbuf=OPENSSL_malloc(BSIZE+HDRSIZE); | |
102 if (outbuf == NULL) return(-1); | |
103 } | |
104 /* If we are sending less than 8 bytes, the same char will look | |
105 * the same if we don't pad it out with random bytes */ | |
106 if (start) | |
107 { | |
108 start=0; | |
109 } | |
110 | |
111 /* lets recurse if we want to send the data in small chunks */ | |
112 if (len > MAXWRITE) | |
113 { | |
114 j=0; | |
115 for (i=0; i<len; i+=k) | |
116 { | |
117 k=DES_enc_write(fd,&(buf[i]), | |
118 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv); | |
119 if (k < 0) | |
120 return(k); | |
121 else | |
122 j+=k; | |
123 } | |
124 return(j); | |
125 } | |
126 | |
127 /* write length first */ | |
128 p=outbuf; | |
129 l2n(len,p); | |
130 | |
131 /* pad short strings */ | |
132 if (len < 8) | |
133 { | |
134 cp=shortbuf; | |
135 memcpy(shortbuf,buf,len); | |
136 RAND_pseudo_bytes(shortbuf+len, 8-len); | |
137 rnum=8; | |
138 } | |
139 else | |
140 { | |
141 cp=buf; | |
142 rnum=((len+7)/8*8); /* round up to nearest eight */ | |
143 } | |
144 | |
145 if (DES_rw_mode & DES_PCBC_MODE) | |
146 DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, | |
147 DES_ENCRYPT); | |
148 else | |
149 DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, | |
150 DES_ENCRYPT); | |
151 | |
152 /* output */ | |
153 outnum=rnum+HDRSIZE; | |
154 | |
155 for (j=0; j<outnum; j+=i) | |
156 { | |
157 /* eay 26/08/92 I was not doing writing from where we | |
158 * got up to. */ | |
159 #ifndef _WIN32 | |
160 i=write(fd,(void *)&(outbuf[j]),outnum-j); | |
161 #else | |
162 i=_write(fd,(void *)&(outbuf[j]),outnum-j); | |
163 #endif | |
164 if (i == -1) | |
165 { | |
166 #ifdef EINTR | |
167 if (errno == EINTR) | |
168 i=0; | |
169 else | |
170 #endif | |
171 /* This is really a bad error - very bad | |
172 * It will stuff-up both ends. */ | |
173 return(-1); | |
174 } | |
175 } | |
176 | |
177 return(len); | |
178 #endif /* OPENSSL_NO_POSIX_IO */ | |
179 } | |
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