Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |