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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * SHA-256, as specified in4 * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf5 *6 * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.7 *8 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>9 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>11 * Copyright (c) 2014 Red Hat Inc.12 */13 14#include <linux/unaligned.h>15#include <crypto/sha256_base.h>16#include <linux/kernel.h>17#include <linux/module.h>18#include <linux/string.h>19 20static const u32 SHA256_K[] = {21 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,22 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,23 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,24 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,25 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,26 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,27 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,28 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,29 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,30 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,31 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,32 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,33 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,34 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,35 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,36 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,37};38 39static inline u32 Ch(u32 x, u32 y, u32 z)40{41 return z ^ (x & (y ^ z));42}43 44static inline u32 Maj(u32 x, u32 y, u32 z)45{46 return (x & y) | (z & (x | y));47}48 49#define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))50#define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))51#define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))52#define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))53 54static inline void LOAD_OP(int I, u32 *W, const u8 *input)55{56 W[I] = get_unaligned_be32((__u32 *)input + I);57}58 59static inline void BLEND_OP(int I, u32 *W)60{61 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];62}63 64#define SHA256_ROUND(i, a, b, c, d, e, f, g, h) do { \65 u32 t1, t2; \66 t1 = h + e1(e) + Ch(e, f, g) + SHA256_K[i] + W[i]; \67 t2 = e0(a) + Maj(a, b, c); \68 d += t1; \69 h = t1 + t2; \70} while (0)71 72static void sha256_transform(u32 *state, const u8 *input, u32 *W)73{74 u32 a, b, c, d, e, f, g, h;75 int i;76 77 /* load the input */78 for (i = 0; i < 16; i += 8) {79 LOAD_OP(i + 0, W, input);80 LOAD_OP(i + 1, W, input);81 LOAD_OP(i + 2, W, input);82 LOAD_OP(i + 3, W, input);83 LOAD_OP(i + 4, W, input);84 LOAD_OP(i + 5, W, input);85 LOAD_OP(i + 6, W, input);86 LOAD_OP(i + 7, W, input);87 }88 89 /* now blend */90 for (i = 16; i < 64; i += 8) {91 BLEND_OP(i + 0, W);92 BLEND_OP(i + 1, W);93 BLEND_OP(i + 2, W);94 BLEND_OP(i + 3, W);95 BLEND_OP(i + 4, W);96 BLEND_OP(i + 5, W);97 BLEND_OP(i + 6, W);98 BLEND_OP(i + 7, W);99 }100 101 /* load the state into our registers */102 a = state[0]; b = state[1]; c = state[2]; d = state[3];103 e = state[4]; f = state[5]; g = state[6]; h = state[7];104 105 /* now iterate */106 for (i = 0; i < 64; i += 8) {107 SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h);108 SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g);109 SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f);110 SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e);111 SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d);112 SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c);113 SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b);114 SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a);115 }116 117 state[0] += a; state[1] += b; state[2] += c; state[3] += d;118 state[4] += e; state[5] += f; state[6] += g; state[7] += h;119}120 121static void sha256_transform_blocks(struct sha256_state *sctx,122 const u8 *input, int blocks)123{124 u32 W[64];125 126 do {127 sha256_transform(sctx->state, input, W);128 input += SHA256_BLOCK_SIZE;129 } while (--blocks);130 131 memzero_explicit(W, sizeof(W));132}133 134void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)135{136 lib_sha256_base_do_update(sctx, data, len, sha256_transform_blocks);137}138EXPORT_SYMBOL(sha256_update);139 140static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_size)141{142 lib_sha256_base_do_finalize(sctx, sha256_transform_blocks);143 lib_sha256_base_finish(sctx, out, digest_size);144}145 146void sha256_final(struct sha256_state *sctx, u8 *out)147{148 __sha256_final(sctx, out, 32);149}150EXPORT_SYMBOL(sha256_final);151 152void sha224_final(struct sha256_state *sctx, u8 *out)153{154 __sha256_final(sctx, out, 28);155}156EXPORT_SYMBOL(sha224_final);157 158void sha256(const u8 *data, unsigned int len, u8 *out)159{160 struct sha256_state sctx;161 162 sha256_init(&sctx);163 sha256_update(&sctx, data, len);164 sha256_final(&sctx, out);165}166EXPORT_SYMBOL(sha256);167 168MODULE_DESCRIPTION("SHA-256 Algorithm");169MODULE_LICENSE("GPL");170