+++ /dev/null
-/*\r
- * SHA-256 algorithm as described at\r
- * \r
- * http://csrc.nist.gov/cryptval/shs.html\r
- */\r
-\r
-#include "ssh.h"\r
-\r
-/* ----------------------------------------------------------------------\r
- * Core SHA256 algorithm: processes 16-word blocks into a message digest.\r
- */\r
-\r
-#define ror(x,y) ( ((x) << (32-y)) | (((uint32)(x)) >> (y)) )\r
-#define shr(x,y) ( (((uint32)(x)) >> (y)) )\r
-#define Ch(x,y,z) ( ((x) & (y)) ^ (~(x) & (z)) )\r
-#define Maj(x,y,z) ( ((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)) )\r
-#define bigsigma0(x) ( ror((x),2) ^ ror((x),13) ^ ror((x),22) )\r
-#define bigsigma1(x) ( ror((x),6) ^ ror((x),11) ^ ror((x),25) )\r
-#define smallsigma0(x) ( ror((x),7) ^ ror((x),18) ^ shr((x),3) )\r
-#define smallsigma1(x) ( ror((x),17) ^ ror((x),19) ^ shr((x),10) )\r
-\r
-void SHA256_Core_Init(SHA256_State *s) {\r
- s->h[0] = 0x6a09e667;\r
- s->h[1] = 0xbb67ae85;\r
- s->h[2] = 0x3c6ef372;\r
- s->h[3] = 0xa54ff53a;\r
- s->h[4] = 0x510e527f;\r
- s->h[5] = 0x9b05688c;\r
- s->h[6] = 0x1f83d9ab;\r
- s->h[7] = 0x5be0cd19;\r
-}\r
-\r
-void SHA256_Block(SHA256_State *s, uint32 *block) {\r
- uint32 w[80];\r
- uint32 a,b,c,d,e,f,g,h;\r
- static const int k[] = {\r
- 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,\r
- 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,\r
- 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,\r
- 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,\r
- 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,\r
- 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,\r
- 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,\r
- 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,\r
- 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,\r
- 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\r
- 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,\r
- 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,\r
- 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,\r
- 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,\r
- 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,\r
- 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,\r
- };\r
-\r
- int t;\r
-\r
- for (t = 0; t < 16; t++)\r
- w[t] = block[t];\r
-\r
- for (t = 16; t < 64; t++)\r
- w[t] = smallsigma1(w[t-2]) + w[t-7] + smallsigma0(w[t-15]) + w[t-16];\r
-\r
- a = s->h[0]; b = s->h[1]; c = s->h[2]; d = s->h[3];\r
- e = s->h[4]; f = s->h[5]; g = s->h[6]; h = s->h[7];\r
-\r
- for (t = 0; t < 64; t+=8) {\r
- uint32 t1, t2;\r
-\r
-#define ROUND(j,a,b,c,d,e,f,g,h) \\r
- t1 = h + bigsigma1(e) + Ch(e,f,g) + k[j] + w[j]; \\r
- t2 = bigsigma0(a) + Maj(a,b,c); \\r
- d = d + t1; h = t1 + t2;\r
-\r
- ROUND(t+0, a,b,c,d,e,f,g,h);\r
- ROUND(t+1, h,a,b,c,d,e,f,g);\r
- ROUND(t+2, g,h,a,b,c,d,e,f);\r
- ROUND(t+3, f,g,h,a,b,c,d,e);\r
- ROUND(t+4, e,f,g,h,a,b,c,d);\r
- ROUND(t+5, d,e,f,g,h,a,b,c);\r
- ROUND(t+6, c,d,e,f,g,h,a,b);\r
- ROUND(t+7, b,c,d,e,f,g,h,a);\r
- }\r
-\r
- s->h[0] += a; s->h[1] += b; s->h[2] += c; s->h[3] += d;\r
- s->h[4] += e; s->h[5] += f; s->h[6] += g; s->h[7] += h;\r
-}\r
-\r
-/* ----------------------------------------------------------------------\r
- * Outer SHA256 algorithm: take an arbitrary length byte string,\r
- * convert it into 16-word blocks with the prescribed padding at\r
- * the end, and pass those blocks to the core SHA256 algorithm.\r
- */\r
-\r
-#define BLKSIZE 64\r
-\r
-void SHA256_Init(SHA256_State *s) {\r
- SHA256_Core_Init(s);\r
- s->blkused = 0;\r
- s->lenhi = s->lenlo = 0;\r
-}\r
-\r
-void SHA256_Bytes(SHA256_State *s, const void *p, int len) {\r
- unsigned char *q = (unsigned char *)p;\r
- uint32 wordblock[16];\r
- uint32 lenw = len;\r
- int i;\r
-\r
- /*\r
- * Update the length field.\r
- */\r
- s->lenlo += lenw;\r
- s->lenhi += (s->lenlo < lenw);\r
-\r
- if (s->blkused && s->blkused+len < BLKSIZE) {\r
- /*\r
- * Trivial case: just add to the block.\r
- */\r
- memcpy(s->block + s->blkused, q, len);\r
- s->blkused += len;\r
- } else {\r
- /*\r
- * We must complete and process at least one block.\r
- */\r
- while (s->blkused + len >= BLKSIZE) {\r
- memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);\r
- q += BLKSIZE - s->blkused;\r
- len -= BLKSIZE - s->blkused;\r
- /* Now process the block. Gather bytes big-endian into words */\r
- for (i = 0; i < 16; i++) {\r
- wordblock[i] =\r
- ( ((uint32)s->block[i*4+0]) << 24 ) |\r
- ( ((uint32)s->block[i*4+1]) << 16 ) |\r
- ( ((uint32)s->block[i*4+2]) << 8 ) |\r
- ( ((uint32)s->block[i*4+3]) << 0 );\r
- }\r
- SHA256_Block(s, wordblock);\r
- s->blkused = 0;\r
- }\r
- memcpy(s->block, q, len);\r
- s->blkused = len;\r
- }\r
-}\r
-\r
-void SHA256_Final(SHA256_State *s, unsigned char *digest) {\r
- int i;\r
- int pad;\r
- unsigned char c[64];\r
- uint32 lenhi, lenlo;\r
-\r
- if (s->blkused >= 56)\r
- pad = 56 + 64 - s->blkused;\r
- else\r
- pad = 56 - s->blkused;\r
-\r
- lenhi = (s->lenhi << 3) | (s->lenlo >> (32-3));\r
- lenlo = (s->lenlo << 3);\r
-\r
- memset(c, 0, pad);\r
- c[0] = 0x80;\r
- SHA256_Bytes(s, &c, pad);\r
-\r
- c[0] = (lenhi >> 24) & 0xFF;\r
- c[1] = (lenhi >> 16) & 0xFF;\r
- c[2] = (lenhi >> 8) & 0xFF;\r
- c[3] = (lenhi >> 0) & 0xFF;\r
- c[4] = (lenlo >> 24) & 0xFF;\r
- c[5] = (lenlo >> 16) & 0xFF;\r
- c[6] = (lenlo >> 8) & 0xFF;\r
- c[7] = (lenlo >> 0) & 0xFF;\r
-\r
- SHA256_Bytes(s, &c, 8);\r
-\r
- for (i = 0; i < 8; i++) {\r
- digest[i*4+0] = (s->h[i] >> 24) & 0xFF;\r
- digest[i*4+1] = (s->h[i] >> 16) & 0xFF;\r
- digest[i*4+2] = (s->h[i] >> 8) & 0xFF;\r
- digest[i*4+3] = (s->h[i] >> 0) & 0xFF;\r
- }\r
-}\r
-\r
-void SHA256_Simple(const void *p, int len, unsigned char *output) {\r
- SHA256_State s;\r
-\r
- SHA256_Init(&s);\r
- SHA256_Bytes(&s, p, len);\r
- SHA256_Final(&s, output);\r
-}\r
-\r
-/*\r
- * Thin abstraction for things where hashes are pluggable.\r
- */\r
-\r
-static void *sha256_init(void)\r
-{\r
- SHA256_State *s;\r
-\r
- s = snew(SHA256_State);\r
- SHA256_Init(s);\r
- return s;\r
-}\r
-\r
-static void sha256_bytes(void *handle, void *p, int len)\r
-{\r
- SHA256_State *s = handle;\r
-\r
- SHA256_Bytes(s, p, len);\r
-}\r
-\r
-static void sha256_final(void *handle, unsigned char *output)\r
-{\r
- SHA256_State *s = handle;\r
-\r
- SHA256_Final(s, output);\r
- sfree(s);\r
-}\r
-\r
-const struct ssh_hash ssh_sha256 = {\r
- sha256_init, sha256_bytes, sha256_final, 32, "SHA-256"\r
-};\r
-\r
-#ifdef TEST\r
-\r
-#include <stdio.h>\r
-#include <stdlib.h>\r
-#include <assert.h>\r
-\r
-int main(void) {\r
- unsigned char digest[32];\r
- int i, j, errors;\r
-\r
- struct {\r
- const char *teststring;\r
- unsigned char digest[32];\r
- } tests[] = {\r
- { "abc", {\r
- 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,\r
- 0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,\r
- 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,\r
- 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad,\r
- } },\r
- { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", {\r
- 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8,\r
- 0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39,\r
- 0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67,\r
- 0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1,\r
- } },\r
- };\r
-\r
- errors = 0;\r
-\r
- for (i = 0; i < sizeof(tests) / sizeof(*tests); i++) {\r
- SHA256_Simple(tests[i].teststring,\r
- strlen(tests[i].teststring), digest);\r
- for (j = 0; j < 32; j++) {\r
- if (digest[j] != tests[i].digest[j]) {\r
- fprintf(stderr,\r
- "\"%s\" digest byte %d should be 0x%02x, is 0x%02x\n",\r
- tests[i].teststring, j, tests[i].digest[j], digest[j]);\r
- errors++;\r
- }\r
- }\r
- }\r
-\r
- printf("%d errors\n", errors);\r
-\r
- return 0;\r
-}\r
-\r
-#endif\r
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