rc5_skey.c 4.0 KB

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  1. /* crypto/rc5/rc5_skey.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/rc5.h>
  59. #include "rc5_locl.h"
  60. void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
  61. int rounds)
  62. {
  63. RC5_32_INT L[64],l,ll,A,B,*S,k;
  64. int i,j,m,c,t,ii,jj;
  65. if ( (rounds != RC5_16_ROUNDS) &&
  66. (rounds != RC5_12_ROUNDS) &&
  67. (rounds != RC5_8_ROUNDS))
  68. rounds=RC5_16_ROUNDS;
  69. key->rounds=rounds;
  70. S= &(key->data[0]);
  71. j=0;
  72. for (i=0; i<=(len-8); i+=8)
  73. {
  74. c2l(data,l);
  75. L[j++]=l;
  76. c2l(data,l);
  77. L[j++]=l;
  78. }
  79. ii=len-i;
  80. if (ii)
  81. {
  82. k=len&0x07;
  83. c2ln(data,l,ll,k);
  84. L[j+0]=l;
  85. L[j+1]=ll;
  86. }
  87. c=(len+3)/4;
  88. t=(rounds+1)*2;
  89. S[0]=RC5_32_P;
  90. for (i=1; i<t; i++)
  91. S[i]=(S[i-1]+RC5_32_Q)&RC5_32_MASK;
  92. j=(t>c)?t:c;
  93. j*=3;
  94. ii=jj=0;
  95. A=B=0;
  96. for (i=0; i<j; i++)
  97. {
  98. k=(S[ii]+A+B)&RC5_32_MASK;
  99. A=S[ii]=ROTATE_l32(k,3);
  100. m=(int)(A+B);
  101. k=(L[jj]+A+B)&RC5_32_MASK;
  102. B=L[jj]=ROTATE_l32(k,m);
  103. if (++ii >= t) ii=0;
  104. if (++jj >= c) jj=0;
  105. }
  106. }