1*7bc319fbSDavid du Colombier /*
2*7bc319fbSDavid du Colombier * sha2_256 block cipher
3*7bc319fbSDavid du Colombier *
4*7bc319fbSDavid du Colombier * Implementation straight from Federal Information Processing Standards
5*7bc319fbSDavid du Colombier * publication 180-2 (+Change Notice to include SHA-224) August 1, 2002
6*7bc319fbSDavid du Colombier * note: the following upper and lower case macro names are distinct
7*7bc319fbSDavid du Colombier * and reflect the functions defined in FIPS pub. 180-2.
8*7bc319fbSDavid du Colombier */
9*7bc319fbSDavid du Colombier
10*7bc319fbSDavid du Colombier #include <u.h>
11*7bc319fbSDavid du Colombier #include <libc.h>
12*7bc319fbSDavid du Colombier
13*7bc319fbSDavid du Colombier #define ROTR(x,n) (((x) >> (n)) | ((x) << (32-(n))))
14*7bc319fbSDavid du Colombier #define sigma0(x) (ROTR((x),7) ^ ROTR((x),18) ^ ((x) >> 3))
15*7bc319fbSDavid du Colombier #define sigma1(x) (ROTR((x),17) ^ ROTR((x),19) ^ ((x) >> 10))
16*7bc319fbSDavid du Colombier #define SIGMA0(x) (ROTR((x),2) ^ ROTR((x),13) ^ ROTR((x),22))
17*7bc319fbSDavid du Colombier #define SIGMA1(x) (ROTR((x),6) ^ ROTR((x),11) ^ ROTR((x),25))
18*7bc319fbSDavid du Colombier #define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
19*7bc319fbSDavid du Colombier #define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
20*7bc319fbSDavid du Colombier
21*7bc319fbSDavid du Colombier /*
22*7bc319fbSDavid du Colombier * first 32 bits of the fractional parts of cube roots of
23*7bc319fbSDavid du Colombier * first 64 primes (2..311).
24*7bc319fbSDavid du Colombier */
25*7bc319fbSDavid du Colombier static u32int K256[64] = {
26*7bc319fbSDavid du Colombier 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,
27*7bc319fbSDavid du Colombier 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
28*7bc319fbSDavid du Colombier 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,
29*7bc319fbSDavid du Colombier 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
30*7bc319fbSDavid du Colombier 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,
31*7bc319fbSDavid du Colombier 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
32*7bc319fbSDavid du Colombier 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,
33*7bc319fbSDavid du Colombier 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
34*7bc319fbSDavid du Colombier 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,
35*7bc319fbSDavid du Colombier 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
36*7bc319fbSDavid du Colombier 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,
37*7bc319fbSDavid du Colombier 0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
38*7bc319fbSDavid du Colombier 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,
39*7bc319fbSDavid du Colombier 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
40*7bc319fbSDavid du Colombier 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,
41*7bc319fbSDavid du Colombier 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2,
42*7bc319fbSDavid du Colombier };
43*7bc319fbSDavid du Colombier
44*7bc319fbSDavid du Colombier void
_sha2block64(uchar * p,ulong len,u32int * s)45*7bc319fbSDavid du Colombier _sha2block64(uchar *p, ulong len, u32int *s)
46*7bc319fbSDavid du Colombier {
47*7bc319fbSDavid du Colombier u32int a, b, c, d, e, f, g, h, t1, t2;
48*7bc319fbSDavid du Colombier u32int *kp, *wp;
49*7bc319fbSDavid du Colombier u32int w[64];
50*7bc319fbSDavid du Colombier uchar *end;
51*7bc319fbSDavid du Colombier
52*7bc319fbSDavid du Colombier /* at this point, we have a multiple of 64 bytes */
53*7bc319fbSDavid du Colombier for(end = p+len; p < end;){
54*7bc319fbSDavid du Colombier a = s[0];
55*7bc319fbSDavid du Colombier b = s[1];
56*7bc319fbSDavid du Colombier c = s[2];
57*7bc319fbSDavid du Colombier d = s[3];
58*7bc319fbSDavid du Colombier e = s[4];
59*7bc319fbSDavid du Colombier f = s[5];
60*7bc319fbSDavid du Colombier g = s[6];
61*7bc319fbSDavid du Colombier h = s[7];
62*7bc319fbSDavid du Colombier
63*7bc319fbSDavid du Colombier for(wp = w; wp < &w[16]; wp++, p += 4)
64*7bc319fbSDavid du Colombier wp[0] = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
65*7bc319fbSDavid du Colombier for(; wp < &w[64]; wp++)
66*7bc319fbSDavid du Colombier wp[0] = sigma1(wp[-2]) + wp[-7] +
67*7bc319fbSDavid du Colombier sigma0(wp[-15]) + wp[-16];
68*7bc319fbSDavid du Colombier
69*7bc319fbSDavid du Colombier for(kp = K256, wp = w; wp < &w[64]; ) {
70*7bc319fbSDavid du Colombier t1 = h + SIGMA1(e) + Ch(e,f,g) + *kp++ + *wp++;
71*7bc319fbSDavid du Colombier t2 = SIGMA0(a) + Maj(a,b,c);
72*7bc319fbSDavid du Colombier h = g;
73*7bc319fbSDavid du Colombier g = f;
74*7bc319fbSDavid du Colombier f = e;
75*7bc319fbSDavid du Colombier e = d + t1;
76*7bc319fbSDavid du Colombier d = c;
77*7bc319fbSDavid du Colombier c = b;
78*7bc319fbSDavid du Colombier b = a;
79*7bc319fbSDavid du Colombier a = t1 + t2;
80*7bc319fbSDavid du Colombier }
81*7bc319fbSDavid du Colombier
82*7bc319fbSDavid du Colombier /* save state */
83*7bc319fbSDavid du Colombier s[0] += a;
84*7bc319fbSDavid du Colombier s[1] += b;
85*7bc319fbSDavid du Colombier s[2] += c;
86*7bc319fbSDavid du Colombier s[3] += d;
87*7bc319fbSDavid du Colombier s[4] += e;
88*7bc319fbSDavid du Colombier s[5] += f;
89*7bc319fbSDavid du Colombier s[6] += g;
90*7bc319fbSDavid du Colombier s[7] += h;
91*7bc319fbSDavid du Colombier }
92*7bc319fbSDavid du Colombier }
93