enc_writ.c 6.3 KB

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  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. #include <errno.h>
  59. #include <time.h>
  60. #include <stdio.h>
  61. #include "internal/cryptlib.h"
  62. #include "des_locl.h"
  63. #include <openssl/rand.h>
  64. /*-
  65. * WARNINGS:
  66. *
  67. * - The data format used by DES_enc_write() and DES_enc_read()
  68. * has a cryptographic weakness: When asked to write more
  69. * than MAXWRITE bytes, DES_enc_write will split the data
  70. * into several chunks that are all encrypted
  71. * using the same IV. So don't use these functions unless you
  72. * are sure you know what you do (in which case you might
  73. * not want to use them anyway).
  74. *
  75. * - This code cannot handle non-blocking sockets.
  76. */
  77. int DES_enc_write(int fd, const void *_buf, int len,
  78. DES_key_schedule *sched, DES_cblock *iv)
  79. {
  80. #if defined(OPENSSL_NO_POSIX_IO)
  81. return (-1);
  82. #else
  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. if (len < 0)
  96. return -1;
  97. if (outbuf == NULL) {
  98. outbuf = OPENSSL_malloc(BSIZE + HDRSIZE);
  99. if (outbuf == NULL)
  100. return (-1);
  101. }
  102. /*
  103. * If we are sending less than 8 bytes, the same char will look the same
  104. * if we don't pad it out with random bytes
  105. */
  106. if (start) {
  107. start = 0;
  108. }
  109. /* lets recurse if we want to send the data in small chunks */
  110. if (len > MAXWRITE) {
  111. j = 0;
  112. for (i = 0; i < len; i += k) {
  113. k = DES_enc_write(fd, &(buf[i]),
  114. ((len - i) > MAXWRITE) ? MAXWRITE : (len - i),
  115. sched, iv);
  116. if (k < 0)
  117. return (k);
  118. else
  119. j += k;
  120. }
  121. return (j);
  122. }
  123. /* write length first */
  124. p = outbuf;
  125. l2n(len, p);
  126. /* pad short strings */
  127. if (len < 8) {
  128. cp = shortbuf;
  129. memcpy(shortbuf, buf, len);
  130. if (RAND_bytes(shortbuf + len, 8 - len) <= 0)
  131. return -1;
  132. rnum = 8;
  133. } else {
  134. cp = buf;
  135. rnum = ((len + 7) / 8 * 8); /* round up to nearest eight */
  136. }
  137. if (DES_rw_mode & DES_PCBC_MODE)
  138. DES_pcbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched,
  139. iv, DES_ENCRYPT);
  140. else
  141. DES_cbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched,
  142. iv, DES_ENCRYPT);
  143. /* output */
  144. outnum = rnum + HDRSIZE;
  145. for (j = 0; j < outnum; j += i) {
  146. /*
  147. * eay 26/08/92 I was not doing writing from where we got up to.
  148. */
  149. # ifndef _WIN32
  150. i = write(fd, (void *)&(outbuf[j]), outnum - j);
  151. # else
  152. i = _write(fd, (void *)&(outbuf[j]), outnum - j);
  153. # endif
  154. if (i == -1) {
  155. # ifdef EINTR
  156. if (errno == EINTR)
  157. i = 0;
  158. else
  159. # endif
  160. /*
  161. * This is really a bad error - very bad It will stuff-up
  162. * both ends.
  163. */
  164. return (-1);
  165. }
  166. }
  167. return (len);
  168. #endif /* OPENSSL_NO_POSIX_IO */
  169. }