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- /*
- * 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;
- }
- }
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