crypto/openssl-0.9.7d/crypto/rc4/rc4.c

   1 /* crypto/rc4/rc4.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 <stdlib.h>
  61 #include <string.h>
  62 #include <openssl/rc4.h>
  63
  64 char *usage[]={
  65 "usage: rc4 args\n",
  66 "\n",
  67 " -in arg         - input file - default stdin\n",
  68 " -out arg        - output file - default stdout\n",
  69 " -key key        - password\n",
  70 NULL
  71 };
  72
  73 int main(int argc, char *argv[])
  74         {
  75         FILE *in=NULL,*out=NULL;
  76         char *infile=NULL,*outfile=NULL,*keystr=NULL;
  77         RC4_KEY key;
  78         char buf[BUFSIZ];
  79         int badops=0,i;
  80         char **pp;
  81         unsigned char md[MD5_DIGEST_LENGTH];
  82
  83         argc--;
  84         argv++;
  85         while (argc >= 1)
  86                 {
  87                 if      (strcmp(*argv,"-in") == 0)
  88                         {
  89                         if (--argc < 1) goto bad;
  90                         infile= *(++argv);
  91                         }
  92                 else if (strcmp(*argv,"-out") == 0)
  93                         {
  94                         if (--argc < 1) goto bad;
  95                         outfile= *(++argv);
  96                         }
  97                 else if (strcmp(*argv,"-key") == 0)
  98                         {
  99                         if (--argc < 1) goto bad;
 100                         keystr= *(++argv);
 101                         }
 102                 else
 103                         {
 104                         fprintf(stderr,"unknown option %s\n",*argv);
 105                         badops=1;
 106                         break;
 107                         }
 108                 argc--;
 109                 argv++;
 110                 }
 111
 112         if (badops)
 113                 {
 114 bad:
 115                 for (pp=usage; (*pp != NULL); pp++)
 116                         fprintf(stderr,"%s",*pp);
 117                 exit(1);
 118                 }
 119
 120         if (infile == NULL)
 121                 in=stdin;
 122         else
 123                 {
 124                 in=fopen(infile,"r");
 125                 if (in == NULL)
 126                         {
 127                         perror("open");
 128                         exit(1);
 129                         }
 130
 131                 }
 132         if (outfile == NULL)
 133                 out=stdout;
 134         else
 135                 {
 136                 out=fopen(outfile,"w");
 137                 if (out == NULL)
 138                         {
 139                         perror("open");
 140                         exit(1);
 141                         }
 142                 }
 143
 144 #ifdef OPENSSL_SYS_MSDOS
 145         /* This should set the file to binary mode. */
 146         {
 147 #include <fcntl.h>
 148         setmode(fileno(in),O_BINARY);
 149         setmode(fileno(out),O_BINARY);
 150         }
 151 #endif
 152
 153         if (keystr == NULL)
 154                 { /* get key */
 155                 i=EVP_read_pw_string(buf,BUFSIZ,"Enter RC4 password:",0);
 156                 if (i != 0)
 157                         {
 158                         OPENSSL_cleanse(buf,BUFSIZ);
 159                         fprintf(stderr,"bad password read\n");
 160                         exit(1);
 161                         }
 162                 keystr=buf;
 163                 }
 164
 165         EVP_Digest((unsigned char *)keystr,(unsigned long)strlen(keystr),md,NULL,EVP_md5());
 166         OPENSSL_cleanse(keystr,strlen(keystr));
 167         RC4_set_key(&key,MD5_DIGEST_LENGTH,md);
 168
 169         for(;;)
 170                 {
 171                 i=fread(buf,1,BUFSIZ,in);
 172                 if (i == 0) break;
 173                 if (i < 0)
 174                         {
 175                         perror("read");
 176                         exit(1);
 177                         }
 178                 RC4(&key,(unsigned int)i,(unsigned char *)buf,
 179                         (unsigned char *)buf);
 180                 i=fwrite(buf,(unsigned int)i,1,out);
 181                 if (i != 1)
 182                         {
 183                         perror("write");
 184                         exit(1);
 185                         }
 186                 }
 187         fclose(out);
 188         fclose(in);
 189         exit(0);
 190         return(1);
 191         }
 192