ref: 47ee1007a90fef61a3af44ce6f00eb623720b80a
dir: /libsec/sha2block64.c/
/* * sha2_256 block cipher * * Implementation straight from Federal Information Processing Standards * publication 180-2 (+Change Notice to include SHA-224) August 1, 2002 * note: the following upper and lower case macro names are distinct * and reflect the functions defined in FIPS pub. 180-2. */ #include <u.h> #include <libc.h> #define ROTR(x,n) (((x) >> (n)) | ((x) << (32-(n)))) #define sigma0(x) (ROTR((x),7) ^ ROTR((x),18) ^ ((x) >> 3)) #define sigma1(x) (ROTR((x),17) ^ ROTR((x),19) ^ ((x) >> 10)) #define SIGMA0(x) (ROTR((x),2) ^ ROTR((x),13) ^ ROTR((x),22)) #define SIGMA1(x) (ROTR((x),6) ^ ROTR((x),11) ^ ROTR((x),25)) #define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z))) #define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z))) /* * first 32 bits of the fractional parts of cube roots of * first 64 primes (2..311). */ static u32int K256[64] = { 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5, 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5, 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3, 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174, 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc, 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da, 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7, 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967, 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13, 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85, 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3, 0xd192e819,0xd6990624,0xf40e3585,0x106aa070, 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5, 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3, 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208, 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2, }; void _sha2block64(uchar *p, ulong len, u32int *s) { u32int a, b, c, d, e, f, g, h, t1, t2; u32int *kp, *wp; u32int w[64]; uchar *end; /* at this point, we have a multiple of 64 bytes */ for(end = p+len; p < end;){ a = s[0]; b = s[1]; c = s[2]; d = s[3]; e = s[4]; f = s[5]; g = s[6]; h = s[7]; for(wp = w; wp < &w[16]; wp++, p += 4) wp[0] = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; for(; wp < &w[64]; wp++) wp[0] = sigma1(wp[-2]) + wp[-7] + sigma0(wp[-15]) + wp[-16]; for(kp = K256, wp = w; wp < &w[64]; ) { t1 = h + SIGMA1(e) + Ch(e,f,g) + *kp++ + *wp++; t2 = SIGMA0(a) + Maj(a,b,c); h = g; g = f; f = e; e = d + t1; d = c; c = b; b = a; a = t1 + t2; } /* save state */ s[0] += a; s[1] += b; s[2] += c; s[3] += d; s[4] += e; s[5] += f; s[6] += g; s[7] += h; } }