1 /* crypto/des/enc_writ.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 #ifdef _LIBC 84 extern unsigned long time(); 85 extern int write(); 86 #endif 87 const unsigned char *buf=_buf; 88 long rnum; 89 int i,j,k,outnum; 90 static unsigned char *outbuf=NULL; 91 unsigned char shortbuf[8]; 92 unsigned char *p; 93 const unsigned char *cp; 94 static int start=1; 95 96 if (outbuf == NULL) 97 { 98 outbuf=OPENSSL_malloc(BSIZE+HDRSIZE); 99 if (outbuf == NULL) return(-1); 100 } 101 /* If we are sending less than 8 bytes, the same char will look 102 * the same if we don't pad it out with random bytes */ 103 if (start) 104 { 105 start=0; 106 } 107 108 /* lets recurse if we want to send the data in small chunks */ 109 if (len > MAXWRITE) 110 { 111 j=0; 112 for (i=0; i<len; i+=k) 113 { 114 k=DES_enc_write(fd,&(buf[i]), 115 ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv); 116 if (k < 0) 117 return(k); 118 else 119 j+=k; 120 } 121 return(j); 122 } 123 124 /* write length first */ 125 p=outbuf; 126 l2n(len,p); 127 128 /* pad short strings */ 129 if (len < 8) 130 { 131 cp=shortbuf; 132 memcpy(shortbuf,buf,len); 133 RAND_pseudo_bytes(shortbuf+len, 8-len); 134 rnum=8; 135 } 136 else 137 { 138 cp=buf; 139 rnum=((len+7)/8*8); /* round up to nearest eight */ 140 } 141 142 if (DES_rw_mode & DES_PCBC_MODE) 143 DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, 144 DES_ENCRYPT); 145 else 146 DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, 147 DES_ENCRYPT); 148 149 /* output */ 150 outnum=rnum+HDRSIZE; 151 152 for (j=0; j<outnum; j+=i) 153 { 154 /* eay 26/08/92 I was not doing writing from where we 155 * got up to. */ 156 #ifndef _WIN32 157 i=write(fd,(void *)&(outbuf[j]),outnum-j); 158 #else 159 i=_write(fd,(void *)&(outbuf[j]),outnum-j); 160 #endif 161 if (i == -1) 162 { 163 #ifdef EINTR 164 if (errno == EINTR) 165 i=0; 166 else 167 #endif 168 /* This is really a bad error - very bad 169 * It will stuff-up both ends. */ 170 return(-1); 171 } 172 } 173 174 return(len); 175 } 176
