logo

utils-std

Collection of commonly available Unix tools git clone https://anongit.hacktivis.me/git/utils-std.git

sha256.c (3727B)


  1. // SPDX-FileCopyrightText: public domain sha256 implementation based on fips180-3
  2. // SPDX-License-Identifier: 0BSD
  3. #include "sha256.h"
  4. #include <ctype.h>
  5. #include <stdint.h>
  6. #include <stdio.h>
  7. #include <stdlib.h>
  8. #include <string.h>
  9. static uint32_t
  10. ror(uint32_t n, int k)
  11. {
  12. return (n >> k) | (n << (32 - k));
  13. }
  14. #define Ch(x, y, z) (z ^ (x & (y ^ z)))
  15. #define Maj(x, y, z) ((x & y) | (z & (x | y)))
  16. #define S0(x) (ror(x, 2) ^ ror(x, 13) ^ ror(x, 22))
  17. #define S1(x) (ror(x, 6) ^ ror(x, 11) ^ ror(x, 25))
  18. #define R0(x) (ror(x, 7) ^ ror(x, 18) ^ (x >> 3))
  19. #define R1(x) (ror(x, 17) ^ ror(x, 19) ^ (x >> 10))
  20. static const uint32_t K[64] = {
  21. 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
  22. 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
  23. 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  24. 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
  25. 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
  26. 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  27. 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
  28. 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
  29. static void
  30. processblock(struct sha256 *s, const uint8_t *buf)
  31. {
  32. uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
  33. int i;
  34. for(i = 0; i < 16; i++)
  35. {
  36. W[i] = (uint32_t)buf[4 * i] << 24;
  37. W[i] |= (uint32_t)buf[4 * i + 1] << 16;
  38. W[i] |= (uint32_t)buf[4 * i + 2] << 8;
  39. W[i] |= buf[4 * i + 3];
  40. }
  41. for(; i < 64; i++)
  42. W[i] = R1(W[i - 2]) + W[i - 7] + R0(W[i - 15]) + W[i - 16];
  43. a = s->h[0];
  44. b = s->h[1];
  45. c = s->h[2];
  46. d = s->h[3];
  47. e = s->h[4];
  48. f = s->h[5];
  49. g = s->h[6];
  50. h = s->h[7];
  51. for(i = 0; i < 64; i++)
  52. {
  53. t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
  54. t2 = S0(a) + Maj(a, b, c);
  55. h = g;
  56. g = f;
  57. f = e;
  58. e = d + t1;
  59. d = c;
  60. c = b;
  61. b = a;
  62. a = t1 + t2;
  63. }
  64. s->h[0] += a;
  65. s->h[1] += b;
  66. s->h[2] += c;
  67. s->h[3] += d;
  68. s->h[4] += e;
  69. s->h[5] += f;
  70. s->h[6] += g;
  71. s->h[7] += h;
  72. }
  73. static void
  74. pad(struct sha256 *s)
  75. {
  76. unsigned r = s->len % 64;
  77. s->buf[r++] = 0x80;
  78. if(r > 56)
  79. {
  80. memset(s->buf + r, 0, 64 - r);
  81. r = 0;
  82. processblock(s, s->buf);
  83. }
  84. memset(s->buf + r, 0, 56 - r);
  85. s->len *= 8;
  86. s->buf[56] = s->len >> 56;
  87. s->buf[57] = s->len >> 48;
  88. s->buf[58] = s->len >> 40;
  89. s->buf[59] = s->len >> 32;
  90. s->buf[60] = s->len >> 24;
  91. s->buf[61] = s->len >> 16;
  92. s->buf[62] = s->len >> 8;
  93. s->buf[63] = s->len;
  94. processblock(s, s->buf);
  95. }
  96. void
  97. sha256_init(void *ctx)
  98. {
  99. struct sha256 *s = ctx;
  100. s->len = 0;
  101. s->h[0] = 0x6a09e667;
  102. s->h[1] = 0xbb67ae85;
  103. s->h[2] = 0x3c6ef372;
  104. s->h[3] = 0xa54ff53a;
  105. s->h[4] = 0x510e527f;
  106. s->h[5] = 0x9b05688c;
  107. s->h[6] = 0x1f83d9ab;
  108. s->h[7] = 0x5be0cd19;
  109. }
  110. void
  111. sha256_sum_n(void *ctx, uint8_t *md, int n)
  112. {
  113. struct sha256 *s = ctx;
  114. int i;
  115. pad(s);
  116. for(i = 0; i < n; i++)
  117. {
  118. md[4 * i] = s->h[i] >> 24;
  119. md[4 * i + 1] = s->h[i] >> 16;
  120. md[4 * i + 2] = s->h[i] >> 8;
  121. md[4 * i + 3] = s->h[i];
  122. }
  123. }
  124. void
  125. sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH])
  126. {
  127. sha256_sum_n(ctx, md, 8);
  128. }
  129. void
  130. sha256_update(void *ctx, const void *m, unsigned long len)
  131. {
  132. struct sha256 *s = ctx;
  133. const uint8_t *p = m;
  134. unsigned r = s->len % 64;
  135. s->len += len;
  136. if(r)
  137. {
  138. if(len < 64 - r)
  139. {
  140. memcpy(s->buf + r, p, len);
  141. return;
  142. }
  143. memcpy(s->buf + r, p, 64 - r);
  144. len -= 64 - r;
  145. p += 64 - r;
  146. processblock(s, s->buf);
  147. }
  148. for(; len >= 64; len -= 64, p += 64)
  149. processblock(s, p);
  150. memcpy(s->buf, p, len);
  151. }