A local copy of OpenSSL from GitHub
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  1. /*
  2. * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
  3. *
  4. * Licensed under the OpenSSL license (the "License"). You may not use
  5. * this file except in compliance with the License. You can obtain a copy
  6. * in the file LICENSE in the source distribution or at
  7. * https://www.openssl.org/source/license.html
  8. */
  9. #include <openssl/cast.h>
  10. #include "cast_lcl.h"
  11. #include "cast_s.h"
  12. #define CAST_exp(l,A,a,n) \
  13. A[n/4]=l; \
  14. a[n+3]=(l )&0xff; \
  15. a[n+2]=(l>> 8)&0xff; \
  16. a[n+1]=(l>>16)&0xff; \
  17. a[n+0]=(l>>24)&0xff;
  18. #define S4 CAST_S_table4
  19. #define S5 CAST_S_table5
  20. #define S6 CAST_S_table6
  21. #define S7 CAST_S_table7
  22. void CAST_set_key(CAST_KEY *key, int len, const unsigned char *data)
  23. {
  24. CAST_LONG x[16];
  25. CAST_LONG z[16];
  26. CAST_LONG k[32];
  27. CAST_LONG X[4], Z[4];
  28. CAST_LONG l, *K;
  29. int i;
  30. for (i = 0; i < 16; i++)
  31. x[i] = 0;
  32. if (len > 16)
  33. len = 16;
  34. for (i = 0; i < len; i++)
  35. x[i] = data[i];
  36. if (len <= 10)
  37. key->short_key = 1;
  38. else
  39. key->short_key = 0;
  40. K = &k[0];
  41. X[0] = ((x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3]) & 0xffffffffL;
  42. X[1] = ((x[4] << 24) | (x[5] << 16) | (x[6] << 8) | x[7]) & 0xffffffffL;
  43. X[2] = ((x[8] << 24) | (x[9] << 16) | (x[10] << 8) | x[11]) & 0xffffffffL;
  44. X[3] =
  45. ((x[12] << 24) | (x[13] << 16) | (x[14] << 8) | x[15]) & 0xffffffffL;
  46. for (;;) {
  47. l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]];
  48. CAST_exp(l, Z, z, 0);
  49. l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]];
  50. CAST_exp(l, Z, z, 4);
  51. l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]];
  52. CAST_exp(l, Z, z, 8);
  53. l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]];
  54. CAST_exp(l, Z, z, 12);
  55. K[0] = S4[z[8]] ^ S5[z[9]] ^ S6[z[7]] ^ S7[z[6]] ^ S4[z[2]];
  56. K[1] = S4[z[10]] ^ S5[z[11]] ^ S6[z[5]] ^ S7[z[4]] ^ S5[z[6]];
  57. K[2] = S4[z[12]] ^ S5[z[13]] ^ S6[z[3]] ^ S7[z[2]] ^ S6[z[9]];
  58. K[3] = S4[z[14]] ^ S5[z[15]] ^ S6[z[1]] ^ S7[z[0]] ^ S7[z[12]];
  59. l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]];
  60. CAST_exp(l, X, x, 0);
  61. l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]];
  62. CAST_exp(l, X, x, 4);
  63. l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]];
  64. CAST_exp(l, X, x, 8);
  65. l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]];
  66. CAST_exp(l, X, x, 12);
  67. K[4] = S4[x[3]] ^ S5[x[2]] ^ S6[x[12]] ^ S7[x[13]] ^ S4[x[8]];
  68. K[5] = S4[x[1]] ^ S5[x[0]] ^ S6[x[14]] ^ S7[x[15]] ^ S5[x[13]];
  69. K[6] = S4[x[7]] ^ S5[x[6]] ^ S6[x[8]] ^ S7[x[9]] ^ S6[x[3]];
  70. K[7] = S4[x[5]] ^ S5[x[4]] ^ S6[x[10]] ^ S7[x[11]] ^ S7[x[7]];
  71. l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]];
  72. CAST_exp(l, Z, z, 0);
  73. l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]];
  74. CAST_exp(l, Z, z, 4);
  75. l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]];
  76. CAST_exp(l, Z, z, 8);
  77. l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]];
  78. CAST_exp(l, Z, z, 12);
  79. K[8] = S4[z[3]] ^ S5[z[2]] ^ S6[z[12]] ^ S7[z[13]] ^ S4[z[9]];
  80. K[9] = S4[z[1]] ^ S5[z[0]] ^ S6[z[14]] ^ S7[z[15]] ^ S5[z[12]];
  81. K[10] = S4[z[7]] ^ S5[z[6]] ^ S6[z[8]] ^ S7[z[9]] ^ S6[z[2]];
  82. K[11] = S4[z[5]] ^ S5[z[4]] ^ S6[z[10]] ^ S7[z[11]] ^ S7[z[6]];
  83. l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]];
  84. CAST_exp(l, X, x, 0);
  85. l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]];
  86. CAST_exp(l, X, x, 4);
  87. l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]];
  88. CAST_exp(l, X, x, 8);
  89. l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]];
  90. CAST_exp(l, X, x, 12);
  91. K[12] = S4[x[8]] ^ S5[x[9]] ^ S6[x[7]] ^ S7[x[6]] ^ S4[x[3]];
  92. K[13] = S4[x[10]] ^ S5[x[11]] ^ S6[x[5]] ^ S7[x[4]] ^ S5[x[7]];
  93. K[14] = S4[x[12]] ^ S5[x[13]] ^ S6[x[3]] ^ S7[x[2]] ^ S6[x[8]];
  94. K[15] = S4[x[14]] ^ S5[x[15]] ^ S6[x[1]] ^ S7[x[0]] ^ S7[x[13]];
  95. if (K != k)
  96. break;
  97. K += 16;
  98. }
  99. for (i = 0; i < 16; i++) {
  100. key->data[i * 2] = k[i];
  101. key->data[i * 2 + 1] = ((k[i + 16]) + 16) & 0x1f;
  102. }
  103. }