93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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* sha2_256 block cipher
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*
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* Implementation straight from Federal Information Processing Standards
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* publication 180-2 (+Change Notice to include SHA-224) August 1, 2002
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* note: the following upper and lower case macro names are distinct
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* and reflect the functions defined in FIPS pub. 180-2.
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*/
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#include <u.h>
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#include <lib9.h>
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#define ROTR(x,n) (((x) >> (n)) | ((x) << (32-(n))))
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#define sigma0(x) (ROTR((x),7) ^ ROTR((x),18) ^ ((x) >> 3))
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#define sigma1(x) (ROTR((x),17) ^ ROTR((x),19) ^ ((x) >> 10))
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#define SIGMA0(x) (ROTR((x),2) ^ ROTR((x),13) ^ ROTR((x),22))
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#define SIGMA1(x) (ROTR((x),6) ^ ROTR((x),11) ^ ROTR((x),25))
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#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
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#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
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/*
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* first 32 bits of the fractional parts of cube roots of
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* first 64 primes (2..311).
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*/
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static uint32_t K256[64] = {
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0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,
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0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
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0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,
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0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
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0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,
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0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
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0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,
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0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
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0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,
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0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
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0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,
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0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
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0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,
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0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
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0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,
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0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2,
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};
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void
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_sha2block64(uint8_t *p, uint32_t len, uint32_t *s)
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{
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uint32_t a, b, c, d, e, f, g, h, t1, t2;
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uint32_t *kp, *wp;
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uint32_t w[64];
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uint8_t *end;
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/* at this point, we have a multiple of 64 bytes */
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for(end = p+len; p < end;){
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a = s[0];
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b = s[1];
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c = s[2];
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d = s[3];
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e = s[4];
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f = s[5];
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g = s[6];
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h = s[7];
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for(wp = w; wp < &w[16]; wp++, p += 4)
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wp[0] = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
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for(; wp < &w[64]; wp++)
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wp[0] = sigma1(wp[-2]) + wp[-7] +
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sigma0(wp[-15]) + wp[-16];
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for(kp = K256, wp = w; wp < &w[64]; ) {
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t1 = h + SIGMA1(e) + Ch(e,f,g) + *kp++ + *wp++;
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t2 = SIGMA0(a) + Maj(a,b,c);
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h = g;
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g = f;
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f = e;
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e = d + t1;
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d = c;
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c = b;
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b = a;
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a = t1 + t2;
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}
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/* save state */
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s[0] += a;
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s[1] += b;
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s[2] += c;
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s[3] += d;
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s[4] += e;
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s[5] += f;
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s[6] += g;
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s[7] += h;
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}
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}
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