1 #include "os.h" 2 #include <libsec.h> 3 4 enum { 5 SHA256rounds = 64, 6 }; 7 8 u32int sha256const[] = { 9 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 10 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 11 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 12 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 13 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 14 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 15 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 16 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2, 17 }; 18 19 20 #define CH(x,y,z) ((x&y) ^ (~x&z)) 21 #define MAJ(x,y,z) ((x&y) ^ (x&z) ^ (y&z)) 22 #define ROTR32(n, v) ((v>>n) | (v<<(32-n))) 23 #define ROTR64(n, v) ((v>>n) | (v<<(64-n))) 24 #define SHR(n, x) (x>>n) 25 26 #define SIGMA0a(x) (ROTR32(2, x)^ROTR32(13, x)^ROTR32(22, x)) 27 #define SIGMA1a(x) (ROTR32(6, x)^ROTR32(11, x)^ROTR32(25, x)) 28 #define sigma0a(x) (ROTR32(7, x)^ROTR32(18, x)^SHR(3, x)) 29 #define sigma1a(x) (ROTR32(17, x)^ROTR32(19, x)^SHR(10, x)) 30 31 /* for use in _sha*() */ 32 #define A v[0] 33 #define B v[1] 34 #define C v[2] 35 #define D v[3] 36 #define E v[4] 37 #define F v[5] 38 #define G v[6] 39 #define H v[7] 40 41 static u32int 42 g32(uchar *p) 43 { 44 return p[0]<<24|p[1]<<16|p[2]<<8|p[3]<<0; 45 } 46 47 void 48 _sha256block(SHA256state *s, uchar *buf) 49 { 50 u32int w[2*SHA256bsize/4]; 51 int i, t; 52 u32int t1, t2; 53 u32int v[8]; 54 55 for(t = 0; t < nelem(w)/2; t++) { 56 if(t < 16) { 57 w[t] = g32(buf); 58 buf += 4; 59 } 60 } 61 62 memmove(v, s->h32, sizeof s->h32); 63 64 for(t = 0; t < SHA256rounds; t++) { 65 if(t >= 16) 66 w[t&31] = sigma1a(w[(t-2)&31]) + w[(t-7)&31] + sigma0a(w[(t-15)&31]) + w[(t-16)&31]; 67 t1 = H + SIGMA1a(E) + CH(E,F,G) + sha256const[t] + w[t&31]; 68 t2 = SIGMA0a(A) + MAJ(A,B,C); 69 H = G; 70 G = F; 71 F = E; 72 E = D+t1; 73 D = C; 74 C = B; 75 B = A; 76 A = t1+t2; 77 } 78 79 for(i = 0; i < nelem(v); i++) 80 s->h32[i] += v[i]; 81 } 82