sha2.c

#define HASH_BITS 256
#define HASH_NAME sha256
#define HASH_FLAGS HASH_MD|HASH_PBKDF2|HASH_HMAC|HASH_INIT

#include "common.h"

static const uint32_t init[8] = {
	0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
	0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
};

#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define EP0(x) (ROR32(x,2) ^ ROR32(x,13) ^ ROR32(x,22))
#define EP1(x) (ROR32(x,6) ^ ROR32(x,11) ^ ROR32(x,25))
#define SIG0(x) (ROR32(x,7) ^ ROR32(x,18) ^ ((x) >> 3))
#define SIG1(x) (ROR32(x,17) ^ ROR32(x,19) ^ ((x) >> 10))

static void transform(uint32_t *state, const uint8_t *in)
{
	static const uint32_t k[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,
	};


	uint32_t a, b, c, d, e, f, g, h, i, t1, t2, m[64];

	/* expand */
	for (i = 0; i < 16; i++)
		m[i] = HOST2BE(((const uint32_t*)(in))[i]);
	for (; i < 64; i++)
		m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];

	/* compress */
	a = state[0];
	b = state[1];
	c = state[2];
	d = state[3];
	e = state[4];
	f = state[5];
	g = state[6];
	h = state[7];
	for (i = 0; i < 64; i++) {
		t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
		t2 = EP0(a) + MAJ(a,b,c);
		h = g; g = f; f = e; e = d + t1;
		d = c; c = b; b = a; a = t1 + t2;
	}
	state[0] += a;
	state[1] += b;
	state[2] += c;
	state[3] += d;
	state[4] += e;
	state[5] += f;
	state[6] += g;
	state[7] += h;
}

#define hash_name "sha2"
#include "common.c"
LUA_EXPORT(sha2)