forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
209 lines
5.4 KiB
209 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* SHA-256, as specified in |
|
* http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf |
|
* |
|
* SHA-256 code by Jean-Luc Cooke <[email protected]>. |
|
* |
|
* Copyright (c) Jean-Luc Cooke <[email protected]> |
|
* Copyright (c) Andrew McDonald <[email protected]> |
|
* Copyright (c) 2002 James Morris <[email protected]> |
|
* Copyright (c) 2014 Red Hat Inc. |
|
*/ |
|
|
|
#include <linux/bitops.h> |
|
#include <linux/export.h> |
|
#include <linux/module.h> |
|
#include <linux/string.h> |
|
#include <crypto/sha2.h> |
|
#include <asm/unaligned.h> |
|
|
|
static const u32 SHA256_K[] = { |
|
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, |
|
}; |
|
|
|
static inline u32 Ch(u32 x, u32 y, u32 z) |
|
{ |
|
return z ^ (x & (y ^ z)); |
|
} |
|
|
|
static inline u32 Maj(u32 x, u32 y, u32 z) |
|
{ |
|
return (x & y) | (z & (x | y)); |
|
} |
|
|
|
#define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22)) |
|
#define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25)) |
|
#define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3)) |
|
#define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10)) |
|
|
|
static inline void LOAD_OP(int I, u32 *W, const u8 *input) |
|
{ |
|
W[I] = get_unaligned_be32((__u32 *)input + I); |
|
} |
|
|
|
static inline void BLEND_OP(int I, u32 *W) |
|
{ |
|
W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; |
|
} |
|
|
|
#define SHA256_ROUND(i, a, b, c, d, e, f, g, h) do { \ |
|
u32 t1, t2; \ |
|
t1 = h + e1(e) + Ch(e, f, g) + SHA256_K[i] + W[i]; \ |
|
t2 = e0(a) + Maj(a, b, c); \ |
|
d += t1; \ |
|
h = t1 + t2; \ |
|
} while (0) |
|
|
|
static void sha256_transform(u32 *state, const u8 *input, u32 *W) |
|
{ |
|
u32 a, b, c, d, e, f, g, h; |
|
int i; |
|
|
|
/* load the input */ |
|
for (i = 0; i < 16; i += 8) { |
|
LOAD_OP(i + 0, W, input); |
|
LOAD_OP(i + 1, W, input); |
|
LOAD_OP(i + 2, W, input); |
|
LOAD_OP(i + 3, W, input); |
|
LOAD_OP(i + 4, W, input); |
|
LOAD_OP(i + 5, W, input); |
|
LOAD_OP(i + 6, W, input); |
|
LOAD_OP(i + 7, W, input); |
|
} |
|
|
|
/* now blend */ |
|
for (i = 16; i < 64; i += 8) { |
|
BLEND_OP(i + 0, W); |
|
BLEND_OP(i + 1, W); |
|
BLEND_OP(i + 2, W); |
|
BLEND_OP(i + 3, W); |
|
BLEND_OP(i + 4, W); |
|
BLEND_OP(i + 5, W); |
|
BLEND_OP(i + 6, W); |
|
BLEND_OP(i + 7, W); |
|
} |
|
|
|
/* load the state into our registers */ |
|
a = state[0]; b = state[1]; c = state[2]; d = state[3]; |
|
e = state[4]; f = state[5]; g = state[6]; h = state[7]; |
|
|
|
/* now iterate */ |
|
for (i = 0; i < 64; i += 8) { |
|
SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h); |
|
SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g); |
|
SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f); |
|
SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e); |
|
SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d); |
|
SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c); |
|
SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b); |
|
SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a); |
|
} |
|
|
|
state[0] += a; state[1] += b; state[2] += c; state[3] += d; |
|
state[4] += e; state[5] += f; state[6] += g; state[7] += h; |
|
} |
|
|
|
void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) |
|
{ |
|
unsigned int partial, done; |
|
const u8 *src; |
|
u32 W[64]; |
|
|
|
partial = sctx->count & 0x3f; |
|
sctx->count += len; |
|
done = 0; |
|
src = data; |
|
|
|
if ((partial + len) > 63) { |
|
if (partial) { |
|
done = -partial; |
|
memcpy(sctx->buf + partial, data, done + 64); |
|
src = sctx->buf; |
|
} |
|
|
|
do { |
|
sha256_transform(sctx->state, src, W); |
|
done += 64; |
|
src = data + done; |
|
} while (done + 63 < len); |
|
|
|
memzero_explicit(W, sizeof(W)); |
|
|
|
partial = 0; |
|
} |
|
memcpy(sctx->buf + partial, src, len - done); |
|
} |
|
EXPORT_SYMBOL(sha256_update); |
|
|
|
void sha224_update(struct sha256_state *sctx, const u8 *data, unsigned int len) |
|
{ |
|
sha256_update(sctx, data, len); |
|
} |
|
EXPORT_SYMBOL(sha224_update); |
|
|
|
static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_words) |
|
{ |
|
__be32 *dst = (__be32 *)out; |
|
__be64 bits; |
|
unsigned int index, pad_len; |
|
int i; |
|
static const u8 padding[64] = { 0x80, }; |
|
|
|
/* Save number of bits */ |
|
bits = cpu_to_be64(sctx->count << 3); |
|
|
|
/* Pad out to 56 mod 64. */ |
|
index = sctx->count & 0x3f; |
|
pad_len = (index < 56) ? (56 - index) : ((64+56) - index); |
|
sha256_update(sctx, padding, pad_len); |
|
|
|
/* Append length (before padding) */ |
|
sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); |
|
|
|
/* Store state in digest */ |
|
for (i = 0; i < digest_words; i++) |
|
put_unaligned_be32(sctx->state[i], &dst[i]); |
|
|
|
/* Zeroize sensitive information. */ |
|
memzero_explicit(sctx, sizeof(*sctx)); |
|
} |
|
|
|
void sha256_final(struct sha256_state *sctx, u8 *out) |
|
{ |
|
__sha256_final(sctx, out, 8); |
|
} |
|
EXPORT_SYMBOL(sha256_final); |
|
|
|
void sha224_final(struct sha256_state *sctx, u8 *out) |
|
{ |
|
__sha256_final(sctx, out, 7); |
|
} |
|
EXPORT_SYMBOL(sha224_final); |
|
|
|
void sha256(const u8 *data, unsigned int len, u8 *out) |
|
{ |
|
struct sha256_state sctx; |
|
|
|
sha256_init(&sctx); |
|
sha256_update(&sctx, data, len); |
|
sha256_final(&sctx, out); |
|
} |
|
EXPORT_SYMBOL(sha256); |
|
|
|
MODULE_LICENSE("GPL");
|
|
|