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	sha512.c - sbase - suckless unix tools
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	sha512.c (5041B)
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	1 /* public domain sha256 implementation based on fips180-3 */
	2
	3 #include <ctype.h>
	4 #include <stdint.h>
	5 #include <stdio.h>
	6 #include <stdlib.h>
	7 #include <string.h>
	8
	9 #include "../sha512.h"
	10
	11 static uint64_t ror(uint64_t n, int k) { return (n >> k) \| (n << (64-k))…
	12 #define Ch(x,y,z) (z ^ (x & (y ^ z)))
	13 #define Maj(x,y,z) ((x & y) \| (z & (x \| y)))
	14 #define S0(x) (ror(x,28) ^ ror(x,34) ^ ror(x,39))
	15 #define S1(x) (ror(x,14) ^ ror(x,18) ^ ror(x,41))
	16 #define R0(x) (ror(x,1) ^ ror(x,8) ^ (x>>7))
	17 #define R1(x) (ror(x,19) ^ ror(x,61) ^ (x>>6))
	18
	19 static const uint64_t K[80] = {
	20 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe…
	21 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xa…
	22 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x5…
	23 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc…
	24 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x2…
	25 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x7…
	26 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xb…
	27 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x1…
	28 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x5…
	29 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x9…
	30 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc…
	31 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x1…
	32 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x3…
	33 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x6…
	34 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8…
	35 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc…
	36 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf…
	37 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1…
	38 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x4…
	39 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6…
	40 };
	41
	42 static void
	43 processblock(struct sha512 s, const uint8_t buf)
	44 {
	45 uint64_t W[80], t1, t2, a, b, c, d, e, f, g, h;
	46 int i;
	47
	48 for (i = 0; i < 16; i++) {
	49 W[i] = (uint64_t)buf[8*i]<<56;
	50 W[i] \|= (uint64_t)buf[8*i+1]<<48;
	51 W[i] \|= (uint64_t)buf[8*i+2]<<40;
	52 W[i] \|= (uint64_t)buf[8*i+3]<<32;
	53 W[i] \|= (uint64_t)buf[8*i+4]<<24;
	54 W[i] \|= (uint64_t)buf[8*i+5]<<16;
	55 W[i] \|= (uint64_t)buf[8*i+6]<<8;
	56 W[i] \|= buf[8*i+7];
	57 }
	58 for (; i < 80; i++)
	59 W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
	60 a = s->h[0];
	61 b = s->h[1];
	62 c = s->h[2];
	63 d = s->h[3];
	64 e = s->h[4];
	65 f = s->h[5];
	66 g = s->h[6];
	67 h = s->h[7];
	68 for (i = 0; i < 80; i++) {
	69 t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
	70 t2 = S0(a) + Maj(a,b,c);
	71 h = g;
	72 g = f;
	73 f = e;
	74 e = d + t1;
	75 d = c;
	76 c = b;
	77 b = a;
	78 a = t1 + t2;
	79 }
	80 s->h[0] += a;
	81 s->h[1] += b;
	82 s->h[2] += c;
	83 s->h[3] += d;
	84 s->h[4] += e;
	85 s->h[5] += f;
	86 s->h[6] += g;
	87 s->h[7] += h;
	88 }
	89
	90 static void
	91 pad(struct sha512 *s)
	92 {
	93 unsigned r = s->len % 128;
	94
	95 s->buf[r++] = 0x80;
	96 if (r > 112) {
	97 memset(s->buf + r, 0, 128 - r);
	98 r = 0;
	99 processblock(s, s->buf);
	100 }
	101 memset(s->buf + r, 0, 120 - r);
	102 s->len *= 8;
	103 s->buf[120] = s->len >> 56;
	104 s->buf[121] = s->len >> 48;
	105 s->buf[122] = s->len >> 40;
	106 s->buf[123] = s->len >> 32;
	107 s->buf[124] = s->len >> 24;
	108 s->buf[125] = s->len >> 16;
	109 s->buf[126] = s->len >> 8;
	110 s->buf[127] = s->len;
	111 processblock(s, s->buf);
	112 }
	113
	114 void
	115 sha512_init(void *ctx)
	116 {
	117 struct sha512 *s = ctx;
	118 s->len = 0;
	119 s->h[0] = 0x6a09e667f3bcc908ULL;
	120 s->h[1] = 0xbb67ae8584caa73bULL;
	121 s->h[2] = 0x3c6ef372fe94f82bULL;
	122 s->h[3] = 0xa54ff53a5f1d36f1ULL;
	123 s->h[4] = 0x510e527fade682d1ULL;
	124 s->h[5] = 0x9b05688c2b3e6c1fULL;
	125 s->h[6] = 0x1f83d9abfb41bd6bULL;
	126 s->h[7] = 0x5be0cd19137e2179ULL;
	127 }
	128
	129 void
	130 sha512_sum_n(void ctx, uint8_t md, int n)
	131 {
	132 struct sha512 *s = ctx;
	133 int i;
	134
	135 pad(s);
	136 for (i = 0; i < n; i++) {
	137 md[8*i] = s->h[i] >> 56;
	138 md[8*i+1] = s->h[i] >> 48;
	139 md[8*i+2] = s->h[i] >> 40;
	140 md[8*i+3] = s->h[i] >> 32;
	141 md[8*i+4] = s->h[i] >> 24;
	142 md[8*i+5] = s->h[i] >> 16;
	143 md[8*i+6] = s->h[i] >> 8;
	144 md[8*i+7] = s->h[i];
	145 }
	146 }
	147
	148 void
	149 sha512_sum(void *ctx, uint8_t md[SHA512_DIGEST_LENGTH])
	150 {
	151 sha512_sum_n(ctx, md, 8);
	152 }
	153
	154 void
	155 sha512_update(void ctx, const void m, unsigned long len)
	156 {
	157 struct sha512 *s = ctx;
	158 const uint8_t *p = m;
	159 unsigned r = s->len % 128;
	160
	161 s->len += len;
	162 if (r) {
	163 if (len < 128 - r) {
	164 memcpy(s->buf + r, p, len);
	165 return;
	166 }
	167 memcpy(s->buf + r, p, 128 - r);
	168 len -= 128 - r;
	169 p += 128 - r;
	170 processblock(s, s->buf);
	171 }
	172 for (; len >= 128; len -= 128, p += 128)
	173 processblock(s, p);
	174 memcpy(s->buf, p, len);
	175 }