| OLD | NEW |
|---|
| (Empty) |
| 1 /* crypto/des/enc_read.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 <stdio.h> | |
| 60 #include <errno.h> | |
| 61 #include "cryptlib.h" | |
| 62 #include "des_locl.h" | |
| 63 | |
| 64 /* This has some uglies in it but it works - even over sockets. */ | |
| 65 /*extern int errno;*/ | |
| 66 OPENSSL_IMPLEMENT_GLOBAL(int,DES_rw_mode,DES_PCBC_MODE) | |
| 67 | |
| 68 | |
| 69 /* | |
| 70 * WARNINGS: | |
| 71 * | |
| 72 * - The data format used by DES_enc_write() and DES_enc_read() | |
| 73 * has a cryptographic weakness: When asked to write more | |
| 74 * than MAXWRITE bytes, DES_enc_write will split the data | |
| 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 */ | |
| 85 | |
| 86 | |
| 87 int DES_enc_read(int fd, void *buf, int len, DES_key_schedule *sched, | |
| 88 DES_cblock *iv) | |
| 89 { | |
| 90 #if defined(OPENSSL_NO_POSIX_IO) | |
| 91 return(0); | |
| 92 #else | |
| 93 /* data to be unencrypted */ | |
| 94 int net_num=0; | |
| 95 static unsigned char *net=NULL; | |
| 96 /* extra unencrypted data | |
| 97 * for when a block of 100 comes in but is des_read one byte at | |
| 98 * a time. */ | |
| 99 static unsigned char *unnet=NULL; | |
| 100 static int unnet_start=0; | |
| 101 static int unnet_left=0; | |
| 102 static unsigned char *tmpbuf=NULL; | |
| 103 int i; | |
| 104 long num=0,rnum; | |
| 105 unsigned char *p; | |
| 106 | |
| 107 if (tmpbuf == NULL) | |
| 108 { | |
| 109 tmpbuf=OPENSSL_malloc(BSIZE); | |
| 110 if (tmpbuf == NULL) return(-1); | |
| 111 } | |
| 112 if (net == NULL) | |
| 113 { | |
| 114 net=OPENSSL_malloc(BSIZE); | |
| 115 if (net == NULL) return(-1); | |
| 116 } | |
| 117 if (unnet == NULL) | |
| 118 { | |
| 119 unnet=OPENSSL_malloc(BSIZE); | |
| 120 if (unnet == NULL) return(-1); | |
| 121 } | |
| 122 /* left over data from last decrypt */ | |
| 123 if (unnet_left != 0) | |
| 124 { | |
| 125 if (unnet_left < len) | |
| 126 { | |
| 127 /* we still still need more data but will return | |
| 128 * with the number of bytes we have - should always | |
| 129 * check the return value */ | |
| 130 memcpy(buf,&(unnet[unnet_start]), | |
| 131 unnet_left); | |
| 132 /* eay 26/08/92 I had the next 2 lines | |
| 133 * reversed :-( */ | |
| 134 i=unnet_left; | |
| 135 unnet_start=unnet_left=0; | |
| 136 } | |
| 137 else | |
| 138 { | |
| 139 memcpy(buf,&(unnet[unnet_start]),len); | |
| 140 unnet_start+=len; | |
| 141 unnet_left-=len; | |
| 142 i=len; | |
| 143 } | |
| 144 return(i); | |
| 145 } | |
| 146 | |
| 147 /* We need to get more data. */ | |
| 148 if (len > MAXWRITE) len=MAXWRITE; | |
| 149 | |
| 150 /* first - get the length */ | |
| 151 while (net_num < HDRSIZE) | |
| 152 { | |
| 153 #ifndef OPENSSL_SYS_WIN32 | |
| 154 i=read(fd,(void *)&(net[net_num]),HDRSIZE-net_num); | |
| 155 #else | |
| 156 i=_read(fd,(void *)&(net[net_num]),HDRSIZE-net_num); | |
| 157 #endif | |
| 158 #ifdef EINTR | |
| 159 if ((i == -1) && (errno == EINTR)) continue; | |
| 160 #endif | |
| 161 if (i <= 0) return(0); | |
| 162 net_num+=i; | |
| 163 } | |
| 164 | |
| 165 /* we now have at net_num bytes in net */ | |
| 166 p=net; | |
| 167 /* num=0; */ | |
| 168 n2l(p,num); | |
| 169 /* num should be rounded up to the next group of eight | |
| 170 * we make sure that we have read a multiple of 8 bytes from the net. | |
| 171 */ | |
| 172 if ((num > MAXWRITE) || (num < 0)) /* error */ | |
| 173 return(-1); | |
| 174 rnum=(num < 8)?8:((num+7)/8*8); | |
| 175 | |
| 176 net_num=0; | |
| 177 while (net_num < rnum) | |
| 178 { | |
| 179 #ifndef OPENSSL_SYS_WIN32 | |
| 180 i=read(fd,(void *)&(net[net_num]),rnum-net_num); | |
| 181 #else | |
| 182 i=_read(fd,(void *)&(net[net_num]),rnum-net_num); | |
| 183 #endif | |
| 184 #ifdef EINTR | |
| 185 if ((i == -1) && (errno == EINTR)) continue; | |
| 186 #endif | |
| 187 if (i <= 0) return(0); | |
| 188 net_num+=i; | |
| 189 } | |
| 190 | |
| 191 /* Check if there will be data left over. */ | |
| 192 if (len < num) | |
| 193 { | |
| 194 if (DES_rw_mode & DES_PCBC_MODE) | |
| 195 DES_pcbc_encrypt(net,unnet,num,sched,iv,DES_DECRYPT); | |
| 196 else | |
| 197 DES_cbc_encrypt(net,unnet,num,sched,iv,DES_DECRYPT); | |
| 198 memcpy(buf,unnet,len); | |
| 199 unnet_start=len; | |
| 200 unnet_left=num-len; | |
| 201 | |
| 202 /* The following line is done because we return num | |
| 203 * as the number of bytes read. */ | |
| 204 num=len; | |
| 205 } | |
| 206 else | |
| 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 */ | |
| 213 if (len < rnum) | |
| 214 { | |
| 215 | |
| 216 if (DES_rw_mode & DES_PCBC_MODE) | |
| 217 DES_pcbc_encrypt(net,tmpbuf,num,sched,iv, | |
| 218 DES_DECRYPT); | |
| 219 else | |
| 220 DES_cbc_encrypt(net,tmpbuf,num,sched,iv, | |
| 221 DES_DECRYPT); | |
| 222 | |
| 223 /* eay 26/08/92 fix a bug that returned more | |
| 224 * bytes than you asked for (returned len bytes :-( */ | |
| 225 memcpy(buf,tmpbuf,num); | |
| 226 } | |
| 227 else | |
| 228 { | |
| 229 if (DES_rw_mode & DES_PCBC_MODE) | |
| 230 DES_pcbc_encrypt(net,buf,num,sched,iv, | |
| 231 DES_DECRYPT); | |
| 232 else | |
| 233 DES_cbc_encrypt(net,buf,num,sched,iv, | |
| 234 DES_DECRYPT); | |
| 235 } | |
| 236 } | |
| 237 return num; | |
| 238 #endif /* OPENSSL_NO_POSIX_IO */ | |
| 239 } | |
| 240 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master