x86/sha256.c: add file

Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>

Author: SergiiDmytruk

xen/lib/Makefile

@@ -29,6 +29,7 @@ lib-y += strsep.o
 lib-y += strspn.o
 lib-y += strstr.o
 lib-$(CONFIG_X86) += sha1.o
+lib-$(CONFIG_X86) += sha256.o
 lib-$(CONFIG_X86) += xxhash32.o
 lib-$(CONFIG_X86) += xxhash64.o
 

xen/lib/sha256.c

@@ -0,0 +1,248 @@
+/*
+ * SHA-256 hash in C
+ *
+ * Copyright (c) 2023 Project Nayuki. (MIT License)
+ * https://www.nayuki.io/page/fast-sha2-hashes-in-x86-assembly
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ * - The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ * - The Software is provided "as is", without warranty of any kind, express or
+ *   implied, including but not limited to the warranties of merchantability,
+ *   fitness for a particular purpose and noninfringement. In no event shall the
+ *   authors or copyright holders be liable for any claim, damages or other
+ *   liability, whether in an action of contract, tort or otherwise, arising from,
+ *   out of or in connection with the Software or the use or other dealings in the
+ *   Software.
+ */
+
+#include <xen/string.h>
+#include <xen/types.h>
+
+#define UINT32_C(v) v ## U
+
+#define BLOCK_LEN 64  // In bytes
+#define STATE_LEN 8  // In words
+
+static void sha256_compress(const uint8_t block[static 64], uint32_t state[static 8]) {
+	#define ROTR32(x, n)  (((0U + (x)) << (32 - (n))) | ((x) >> (n)))  // Assumes that x is uint32_t and 0 < n < 32
+
+	#define LOADSCHEDULE(i)  \
+		schedule[i] = (uint32_t)block[i * 4 + 0] << 24  \
+		            | (uint32_t)block[i * 4 + 1] << 16  \
+		            | (uint32_t)block[i * 4 + 2] <<  8  \
+		            | (uint32_t)block[i * 4 + 3] <<  0;
+
+	#define SCHEDULE(i)  \
+		schedule[i] = 0U + schedule[i - 16] + schedule[i - 7]  \
+			+ (ROTR32(schedule[i - 15], 7) ^ ROTR32(schedule[i - 15], 18) ^ (schedule[i - 15] >> 3))  \
+			+ (ROTR32(schedule[i - 2], 17) ^ ROTR32(schedule[i - 2], 19) ^ (schedule[i - 2] >> 10));
+
+	#define ROUND(a, b, c, d, e, f, g, h, i, k) \
+		h = 0U + h + (ROTR32(e, 6) ^ ROTR32(e, 11) ^ ROTR32(e, 25)) + (g ^ (e & (f ^ g))) + UINT32_C(k) + schedule[i];  \
+		d = 0U + d + h;  \
+		h = 0U + h + (ROTR32(a, 2) ^ ROTR32(a, 13) ^ ROTR32(a, 22)) + ((a & (b | c)) | (b & c));
+
+	uint32_t schedule[64];
+
+	uint32_t a = state[0];
+	uint32_t b = state[1];
+	uint32_t c = state[2];
+	uint32_t d = state[3];
+	uint32_t e = state[4];
+	uint32_t f = state[5];
+	uint32_t g = state[6];
+	uint32_t h = state[7];
+
+	LOADSCHEDULE( 0)
+	LOADSCHEDULE( 1)
+	LOADSCHEDULE( 2)
+	LOADSCHEDULE( 3)
+	LOADSCHEDULE( 4)
+	LOADSCHEDULE( 5)
+	LOADSCHEDULE( 6)
+	LOADSCHEDULE( 7)
+	LOADSCHEDULE( 8)
+	LOADSCHEDULE( 9)
+	LOADSCHEDULE(10)
+	LOADSCHEDULE(11)
+	LOADSCHEDULE(12)
+	LOADSCHEDULE(13)
+	LOADSCHEDULE(14)
+	LOADSCHEDULE(15)
+	SCHEDULE(16)
+	SCHEDULE(17)
+	SCHEDULE(18)
+	SCHEDULE(19)
+	SCHEDULE(20)
+	SCHEDULE(21)
+	SCHEDULE(22)
+	SCHEDULE(23)
+	SCHEDULE(24)
+	SCHEDULE(25)
+	SCHEDULE(26)
+	SCHEDULE(27)
+	SCHEDULE(28)
+	SCHEDULE(29)
+	SCHEDULE(30)
+	SCHEDULE(31)
+	SCHEDULE(32)
+	SCHEDULE(33)
+	SCHEDULE(34)
+	SCHEDULE(35)
+	SCHEDULE(36)
+	SCHEDULE(37)
+	SCHEDULE(38)
+	SCHEDULE(39)
+	SCHEDULE(40)
+	SCHEDULE(41)
+	SCHEDULE(42)
+	SCHEDULE(43)
+	SCHEDULE(44)
+	SCHEDULE(45)
+	SCHEDULE(46)
+	SCHEDULE(47)
+	SCHEDULE(48)
+	SCHEDULE(49)
+	SCHEDULE(50)
+	SCHEDULE(51)
+	SCHEDULE(52)
+	SCHEDULE(53)
+	SCHEDULE(54)
+	SCHEDULE(55)
+	SCHEDULE(56)
+	SCHEDULE(57)
+	SCHEDULE(58)
+	SCHEDULE(59)
+	SCHEDULE(60)
+	SCHEDULE(61)
+	SCHEDULE(62)
+	SCHEDULE(63)
+
+	ROUND(a, b, c, d, e, f, g, h,  0, 0x428A2F98)
+	ROUND(h, a, b, c, d, e, f, g,  1, 0x71374491)
+	ROUND(g, h, a, b, c, d, e, f,  2, 0xB5C0FBCF)
+	ROUND(f, g, h, a, b, c, d, e,  3, 0xE9B5DBA5)
+	ROUND(e, f, g, h, a, b, c, d,  4, 0x3956C25B)
+	ROUND(d, e, f, g, h, a, b, c,  5, 0x59F111F1)
+	ROUND(c, d, e, f, g, h, a, b,  6, 0x923F82A4)
+	ROUND(b, c, d, e, f, g, h, a,  7, 0xAB1C5ED5)
+	ROUND(a, b, c, d, e, f, g, h,  8, 0xD807AA98)
+	ROUND(h, a, b, c, d, e, f, g,  9, 0x12835B01)
+	ROUND(g, h, a, b, c, d, e, f, 10, 0x243185BE)
+	ROUND(f, g, h, a, b, c, d, e, 11, 0x550C7DC3)
+	ROUND(e, f, g, h, a, b, c, d, 12, 0x72BE5D74)
+	ROUND(d, e, f, g, h, a, b, c, 13, 0x80DEB1FE)
+	ROUND(c, d, e, f, g, h, a, b, 14, 0x9BDC06A7)
+	ROUND(b, c, d, e, f, g, h, a, 15, 0xC19BF174)
+	ROUND(a, b, c, d, e, f, g, h, 16, 0xE49B69C1)
+	ROUND(h, a, b, c, d, e, f, g, 17, 0xEFBE4786)
+	ROUND(g, h, a, b, c, d, e, f, 18, 0x0FC19DC6)
+	ROUND(f, g, h, a, b, c, d, e, 19, 0x240CA1CC)
+	ROUND(e, f, g, h, a, b, c, d, 20, 0x2DE92C6F)
+	ROUND(d, e, f, g, h, a, b, c, 21, 0x4A7484AA)
+	ROUND(c, d, e, f, g, h, a, b, 22, 0x5CB0A9DC)
+	ROUND(b, c, d, e, f, g, h, a, 23, 0x76F988DA)
+	ROUND(a, b, c, d, e, f, g, h, 24, 0x983E5152)
+	ROUND(h, a, b, c, d, e, f, g, 25, 0xA831C66D)
+	ROUND(g, h, a, b, c, d, e, f, 26, 0xB00327C8)
+	ROUND(f, g, h, a, b, c, d, e, 27, 0xBF597FC7)
+	ROUND(e, f, g, h, a, b, c, d, 28, 0xC6E00BF3)
+	ROUND(d, e, f, g, h, a, b, c, 29, 0xD5A79147)
+	ROUND(c, d, e, f, g, h, a, b, 30, 0x06CA6351)
+	ROUND(b, c, d, e, f, g, h, a, 31, 0x14292967)
+	ROUND(a, b, c, d, e, f, g, h, 32, 0x27B70A85)
+	ROUND(h, a, b, c, d, e, f, g, 33, 0x2E1B2138)
+	ROUND(g, h, a, b, c, d, e, f, 34, 0x4D2C6DFC)
+	ROUND(f, g, h, a, b, c, d, e, 35, 0x53380D13)
+	ROUND(e, f, g, h, a, b, c, d, 36, 0x650A7354)
+	ROUND(d, e, f, g, h, a, b, c, 37, 0x766A0ABB)
+	ROUND(c, d, e, f, g, h, a, b, 38, 0x81C2C92E)
+	ROUND(b, c, d, e, f, g, h, a, 39, 0x92722C85)
+	ROUND(a, b, c, d, e, f, g, h, 40, 0xA2BFE8A1)
+	ROUND(h, a, b, c, d, e, f, g, 41, 0xA81A664B)
+	ROUND(g, h, a, b, c, d, e, f, 42, 0xC24B8B70)
+	ROUND(f, g, h, a, b, c, d, e, 43, 0xC76C51A3)
+	ROUND(e, f, g, h, a, b, c, d, 44, 0xD192E819)
+	ROUND(d, e, f, g, h, a, b, c, 45, 0xD6990624)
+	ROUND(c, d, e, f, g, h, a, b, 46, 0xF40E3585)
+	ROUND(b, c, d, e, f, g, h, a, 47, 0x106AA070)
+	ROUND(a, b, c, d, e, f, g, h, 48, 0x19A4C116)
+	ROUND(h, a, b, c, d, e, f, g, 49, 0x1E376C08)
+	ROUND(g, h, a, b, c, d, e, f, 50, 0x2748774C)
+	ROUND(f, g, h, a, b, c, d, e, 51, 0x34B0BCB5)
+	ROUND(e, f, g, h, a, b, c, d, 52, 0x391C0CB3)
+	ROUND(d, e, f, g, h, a, b, c, 53, 0x4ED8AA4A)
+	ROUND(c, d, e, f, g, h, a, b, 54, 0x5B9CCA4F)
+	ROUND(b, c, d, e, f, g, h, a, 55, 0x682E6FF3)
+	ROUND(a, b, c, d, e, f, g, h, 56, 0x748F82EE)
+	ROUND(h, a, b, c, d, e, f, g, 57, 0x78A5636F)
+	ROUND(g, h, a, b, c, d, e, f, 58, 0x84C87814)
+	ROUND(f, g, h, a, b, c, d, e, 59, 0x8CC70208)
+	ROUND(e, f, g, h, a, b, c, d, 60, 0x90BEFFFA)
+	ROUND(d, e, f, g, h, a, b, c, 61, 0xA4506CEB)
+	ROUND(c, d, e, f, g, h, a, b, 62, 0xBEF9A3F7)
+	ROUND(b, c, d, e, f, g, h, a, 63, 0xC67178F2)
+
+	state[0] = 0U + state[0] + a;
+	state[1] = 0U + state[1] + b;
+	state[2] = 0U + state[2] + c;
+	state[3] = 0U + state[3] + d;
+	state[4] = 0U + state[4] + e;
+	state[5] = 0U + state[5] + f;
+	state[6] = 0U + state[6] + g;
+	state[7] = 0U + state[7] + h;
+}
+
+/* Full message hasher */
+
+void sha256_hash(const uint8_t message[], size_t len, uint32_t hash[static STATE_LEN]) {
+	uint8_t block[BLOCK_LEN] = {0};
+	size_t off;
+	size_t rem;
+
+	hash[0] = UINT32_C(0x6A09E667);
+	hash[1] = UINT32_C(0xBB67AE85);
+	hash[2] = UINT32_C(0x3C6EF372);
+	hash[3] = UINT32_C(0xA54FF53A);
+	hash[4] = UINT32_C(0x510E527F);
+	hash[5] = UINT32_C(0x9B05688C);
+	hash[6] = UINT32_C(0x1F83D9AB);
+	hash[7] = UINT32_C(0x5BE0CD19);
+
+	#define LENGTH_SIZE 8  // In bytes
+
+	for (off = 0; len - off >= BLOCK_LEN; off += BLOCK_LEN)
+		sha256_compress(&message[off], hash);
+
+	rem = len - off;
+	if (rem > 0)
+		memcpy(block, &message[off], rem);
+
+	block[rem] = 0x80;
+	rem++;
+	if (BLOCK_LEN - rem < LENGTH_SIZE) {
+		sha256_compress(block, hash);
+		memset(block, 0, sizeof(block));
+	}
+
+	block[BLOCK_LEN - 1] = (uint8_t)((len & 0x1FU) << 3);
+	len >>= 5;
+	for (int i = 1; i < LENGTH_SIZE; i++, len >>= 8)
+		block[BLOCK_LEN - 1 - i] = (uint8_t)(len & 0xFFU);
+	sha256_compress(block, hash);
+
+	hash[0] = __builtin_bswap32(hash[0]);
+	hash[1] = __builtin_bswap32(hash[1]);
+	hash[2] = __builtin_bswap32(hash[2]);
+	hash[3] = __builtin_bswap32(hash[3]);
+	hash[4] = __builtin_bswap32(hash[4]);
+	hash[5] = __builtin_bswap32(hash[5]);
+	hash[6] = __builtin_bswap32(hash[6]);
+	hash[7] = __builtin_bswap32(hash[7]);
+}