1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * SHA-256, as specified in |
4 | * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf |
5 | * |
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 <asm/unaligned.h> |
15 | #include <crypto/sha256_base.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> |
18 | #include <linux/string.h> |
19 | |
20 | static 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 | |
39 | static inline u32 Ch(u32 x, u32 y, u32 z) |
40 | { |
41 | return z ^ (x & (y ^ z)); |
42 | } |
43 | |
44 | static 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 | |
54 | static inline void LOAD_OP(int I, u32 *W, const u8 *input) |
55 | { |
56 | W[I] = get_unaligned_be32(p: (__u32 *)input + I); |
57 | } |
58 | |
59 | static 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 | |
72 | static 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: i + 0, W, input); |
80 | LOAD_OP(I: i + 1, W, input); |
81 | LOAD_OP(I: i + 2, W, input); |
82 | LOAD_OP(I: i + 3, W, input); |
83 | LOAD_OP(I: i + 4, W, input); |
84 | LOAD_OP(I: i + 5, W, input); |
85 | LOAD_OP(I: i + 6, W, input); |
86 | LOAD_OP(I: i + 7, W, input); |
87 | } |
88 | |
89 | /* now blend */ |
90 | for (i = 16; i < 64; i += 8) { |
91 | BLEND_OP(I: i + 0, W); |
92 | BLEND_OP(I: i + 1, W); |
93 | BLEND_OP(I: i + 2, W); |
94 | BLEND_OP(I: i + 3, W); |
95 | BLEND_OP(I: i + 4, W); |
96 | BLEND_OP(I: i + 5, W); |
97 | BLEND_OP(I: i + 6, W); |
98 | BLEND_OP(I: 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 | |
121 | static 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(state: sctx->state, input, W); |
128 | input += SHA256_BLOCK_SIZE; |
129 | } while (--blocks); |
130 | |
131 | memzero_explicit(s: W, count: sizeof(W)); |
132 | } |
133 | |
134 | void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) |
135 | { |
136 | lib_sha256_base_do_update(sctx, data, len, block_fn: sha256_transform_blocks); |
137 | } |
138 | EXPORT_SYMBOL(sha256_update); |
139 | |
140 | static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_size) |
141 | { |
142 | lib_sha256_base_do_finalize(sctx, block_fn: sha256_transform_blocks); |
143 | lib_sha256_base_finish(sctx, out, digest_size); |
144 | } |
145 | |
146 | void sha256_final(struct sha256_state *sctx, u8 *out) |
147 | { |
148 | __sha256_final(sctx, out, digest_size: 32); |
149 | } |
150 | EXPORT_SYMBOL(sha256_final); |
151 | |
152 | void sha224_final(struct sha256_state *sctx, u8 *out) |
153 | { |
154 | __sha256_final(sctx, out, digest_size: 28); |
155 | } |
156 | EXPORT_SYMBOL(sha224_final); |
157 | |
158 | void sha256(const u8 *data, unsigned int len, u8 *out) |
159 | { |
160 | struct sha256_state sctx; |
161 | |
162 | sha256_init(sctx: &sctx); |
163 | sha256_update(sctx: &sctx, data, len); |
164 | sha256_final(sctx: &sctx, out); |
165 | } |
166 | EXPORT_SYMBOL(sha256); |
167 | |
168 | MODULE_LICENSE("GPL" ); |
169 | |