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/release/src/router/openssl/crypto/idea/i_cfb64.c

https://gitlab.com/envieidoc/advancedtomato2
C | 123 lines | 57 code | 4 blank | 62 comment | 8 complexity | 812f6f72ae1ae138c14df45d56b70cd5 MD5 | raw file
  1. /* crypto/idea/i_cfb64.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 <openssl/idea.h>
  59. #include "idea_lcl.h"
  60. /*
  61. * The input and output encrypted as though 64bit cfb mode is being used.
  62. * The extra state information to record how much of the 64bit block we have
  63. * used is contained in *num;
  64. */
  65. void idea_cfb64_encrypt(const unsigned char *in, unsigned char *out,
  66. long length, IDEA_KEY_SCHEDULE *schedule,
  67. unsigned char *ivec, int *num, int encrypt)
  68. {
  69. register unsigned long v0, v1, t;
  70. register int n = *num;
  71. register long l = length;
  72. unsigned long ti[2];
  73. unsigned char *iv, c, cc;
  74. iv = (unsigned char *)ivec;
  75. if (encrypt) {
  76. while (l--) {
  77. if (n == 0) {
  78. n2l(iv, v0);
  79. ti[0] = v0;
  80. n2l(iv, v1);
  81. ti[1] = v1;
  82. idea_encrypt((unsigned long *)ti, schedule);
  83. iv = (unsigned char *)ivec;
  84. t = ti[0];
  85. l2n(t, iv);
  86. t = ti[1];
  87. l2n(t, iv);
  88. iv = (unsigned char *)ivec;
  89. }
  90. c = *(in++) ^ iv[n];
  91. *(out++) = c;
  92. iv[n] = c;
  93. n = (n + 1) & 0x07;
  94. }
  95. } else {
  96. while (l--) {
  97. if (n == 0) {
  98. n2l(iv, v0);
  99. ti[0] = v0;
  100. n2l(iv, v1);
  101. ti[1] = v1;
  102. idea_encrypt((unsigned long *)ti, schedule);
  103. iv = (unsigned char *)ivec;
  104. t = ti[0];
  105. l2n(t, iv);
  106. t = ti[1];
  107. l2n(t, iv);
  108. iv = (unsigned char *)ivec;
  109. }
  110. cc = *(in++);
  111. c = iv[n];
  112. iv[n] = cc;
  113. *(out++) = c ^ cc;
  114. n = (n + 1) & 0x07;
  115. }
  116. }
  117. v0 = v1 = ti[0] = ti[1] = t = c = cc = 0;
  118. *num = n;
  119. }