rc4.c 5.3 KB

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