1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * SHA-256, as specified in 3 * SHA-256, as specified in
4 * http://csrc.nist.gov/groups/STM/cavp/docume 4 * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
5 * 5 *
6 * SHA-256 code by Jean-Luc Cooke <jlcooke@cer 6 * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
7 * 7 *
8 * Copyright (c) Jean-Luc Cooke <jlcooke@certa 8 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
9 * Copyright (c) Andrew McDonald <andrew@mcdon 9 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
10 * Copyright (c) 2002 James Morris <jmorris@in 10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
11 * Copyright (c) 2014 Red Hat Inc. 11 * Copyright (c) 2014 Red Hat Inc.
12 */ 12 */
13 13
14 #include <linux/unaligned.h> 14 #include <linux/unaligned.h>
15 #include <crypto/sha256_base.h> 15 #include <crypto/sha256_base.h>
16 #include <linux/kernel.h> 16 #include <linux/kernel.h>
17 #include <linux/module.h> 17 #include <linux/module.h>
18 #include <linux/string.h> 18 #include <linux/string.h>
19 19
20 static const u32 SHA256_K[] = { 20 static const u32 SHA256_K[] = {
21 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0x 21 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
22 0x3956c25b, 0x59f111f1, 0x923f82a4, 0x 22 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
23 0xd807aa98, 0x12835b01, 0x243185be, 0x 23 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
24 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0x 24 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
25 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x 25 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
26 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x 26 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
27 0x983e5152, 0xa831c66d, 0xb00327c8, 0x 27 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
28 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x 28 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
29 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x 29 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
30 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x 30 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
31 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0x 31 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
32 0xd192e819, 0xd6990624, 0xf40e3585, 0x 32 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
33 0x19a4c116, 0x1e376c08, 0x2748774c, 0x 33 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
34 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x 34 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
35 0x748f82ee, 0x78a5636f, 0x84c87814, 0x 35 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
36 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0x 36 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
37 }; 37 };
38 38
39 static inline u32 Ch(u32 x, u32 y, u32 z) 39 static inline u32 Ch(u32 x, u32 y, u32 z)
40 { 40 {
41 return z ^ (x & (y ^ z)); 41 return z ^ (x & (y ^ z));
42 } 42 }
43 43
44 static inline u32 Maj(u32 x, u32 y, u32 z) 44 static inline u32 Maj(u32 x, u32 y, u32 z)
45 { 45 {
46 return (x & y) | (z & (x | y)); 46 return (x & y) | (z & (x | y));
47 } 47 }
48 48
49 #define e0(x) (ror32(x, 2) ^ ror32(x, 13 49 #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
50 #define e1(x) (ror32(x, 6) ^ ror32(x, 11 50 #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
51 #define s0(x) (ror32(x, 7) ^ ror32(x, 18 51 #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
52 #define s1(x) (ror32(x, 17) ^ ror32(x, 1 52 #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
53 53
54 static inline void LOAD_OP(int I, u32 *W, cons 54 static inline void LOAD_OP(int I, u32 *W, const u8 *input)
55 { 55 {
56 W[I] = get_unaligned_be32((__u32 *)inp 56 W[I] = get_unaligned_be32((__u32 *)input + I);
57 } 57 }
58 58
59 static inline void BLEND_OP(int I, u32 *W) 59 static inline void BLEND_OP(int I, u32 *W)
60 { 60 {
61 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15 61 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
62 } 62 }
63 63
64 #define SHA256_ROUND(i, a, b, c, d, e, f, g, h 64 #define SHA256_ROUND(i, a, b, c, d, e, f, g, h) do { \
65 u32 t1, t2; 65 u32 t1, t2; \
66 t1 = h + e1(e) + Ch(e, f, g) + SHA256_ 66 t1 = h + e1(e) + Ch(e, f, g) + SHA256_K[i] + W[i]; \
67 t2 = e0(a) + Maj(a, b, c); 67 t2 = e0(a) + Maj(a, b, c); \
68 d += t1; 68 d += t1; \
69 h = t1 + t2; 69 h = t1 + t2; \
70 } while (0) 70 } while (0)
71 71
72 static void sha256_transform(u32 *state, const 72 static void sha256_transform(u32 *state, const u8 *input, u32 *W)
73 { 73 {
74 u32 a, b, c, d, e, f, g, h; 74 u32 a, b, c, d, e, f, g, h;
75 int i; 75 int i;
76 76
77 /* load the input */ 77 /* load the input */
78 for (i = 0; i < 16; i += 8) { 78 for (i = 0; i < 16; i += 8) {
79 LOAD_OP(i + 0, W, input); 79 LOAD_OP(i + 0, W, input);
80 LOAD_OP(i + 1, W, input); 80 LOAD_OP(i + 1, W, input);
81 LOAD_OP(i + 2, W, input); 81 LOAD_OP(i + 2, W, input);
82 LOAD_OP(i + 3, W, input); 82 LOAD_OP(i + 3, W, input);
83 LOAD_OP(i + 4, W, input); 83 LOAD_OP(i + 4, W, input);
84 LOAD_OP(i + 5, W, input); 84 LOAD_OP(i + 5, W, input);
85 LOAD_OP(i + 6, W, input); 85 LOAD_OP(i + 6, W, input);
86 LOAD_OP(i + 7, W, input); 86 LOAD_OP(i + 7, W, input);
87 } 87 }
88 88
89 /* now blend */ 89 /* now blend */
90 for (i = 16; i < 64; i += 8) { 90 for (i = 16; i < 64; i += 8) {
91 BLEND_OP(i + 0, W); 91 BLEND_OP(i + 0, W);
92 BLEND_OP(i + 1, W); 92 BLEND_OP(i + 1, W);
93 BLEND_OP(i + 2, W); 93 BLEND_OP(i + 2, W);
94 BLEND_OP(i + 3, W); 94 BLEND_OP(i + 3, W);
95 BLEND_OP(i + 4, W); 95 BLEND_OP(i + 4, W);
96 BLEND_OP(i + 5, W); 96 BLEND_OP(i + 5, W);
97 BLEND_OP(i + 6, W); 97 BLEND_OP(i + 6, W);
98 BLEND_OP(i + 7, W); 98 BLEND_OP(i + 7, W);
99 } 99 }
100 100
101 /* load the state into our registers * 101 /* load the state into our registers */
102 a = state[0]; b = state[1]; c = stat 102 a = state[0]; b = state[1]; c = state[2]; d = state[3];
103 e = state[4]; f = state[5]; g = stat 103 e = state[4]; f = state[5]; g = state[6]; h = state[7];
104 104
105 /* now iterate */ 105 /* now iterate */
106 for (i = 0; i < 64; i += 8) { 106 for (i = 0; i < 64; i += 8) {
107 SHA256_ROUND(i + 0, a, b, c, d 107 SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h);
108 SHA256_ROUND(i + 1, h, a, b, c 108 SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g);
109 SHA256_ROUND(i + 2, g, h, a, b 109 SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f);
110 SHA256_ROUND(i + 3, f, g, h, a 110 SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e);
111 SHA256_ROUND(i + 4, e, f, g, h 111 SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d);
112 SHA256_ROUND(i + 5, d, e, f, g 112 SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c);
113 SHA256_ROUND(i + 6, c, d, e, f 113 SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b);
114 SHA256_ROUND(i + 7, b, c, d, e 114 SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a);
115 } 115 }
116 116
117 state[0] += a; state[1] += b; state[2] 117 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
118 state[4] += e; state[5] += f; state[6] 118 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
119 } 119 }
120 120
121 static void sha256_transform_blocks(struct sha 121 static void sha256_transform_blocks(struct sha256_state *sctx,
122 const u8 * 122 const u8 *input, int blocks)
123 { 123 {
124 u32 W[64]; 124 u32 W[64];
125 125
126 do { 126 do {
127 sha256_transform(sctx->state, 127 sha256_transform(sctx->state, input, W);
128 input += SHA256_BLOCK_SIZE; 128 input += SHA256_BLOCK_SIZE;
129 } while (--blocks); 129 } while (--blocks);
130 130
131 memzero_explicit(W, sizeof(W)); 131 memzero_explicit(W, sizeof(W));
132 } 132 }
133 133
134 void sha256_update(struct sha256_state *sctx, 134 void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
135 { 135 {
136 lib_sha256_base_do_update(sctx, data, 136 lib_sha256_base_do_update(sctx, data, len, sha256_transform_blocks);
137 } 137 }
138 EXPORT_SYMBOL(sha256_update); 138 EXPORT_SYMBOL(sha256_update);
139 139
140 static void __sha256_final(struct sha256_state 140 static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_size)
141 { 141 {
142 lib_sha256_base_do_finalize(sctx, sha2 142 lib_sha256_base_do_finalize(sctx, sha256_transform_blocks);
143 lib_sha256_base_finish(sctx, out, dige 143 lib_sha256_base_finish(sctx, out, digest_size);
144 } 144 }
145 145
146 void sha256_final(struct sha256_state *sctx, u 146 void sha256_final(struct sha256_state *sctx, u8 *out)
147 { 147 {
148 __sha256_final(sctx, out, 32); 148 __sha256_final(sctx, out, 32);
149 } 149 }
150 EXPORT_SYMBOL(sha256_final); 150 EXPORT_SYMBOL(sha256_final);
151 151
152 void sha224_final(struct sha256_state *sctx, u 152 void sha224_final(struct sha256_state *sctx, u8 *out)
153 { 153 {
154 __sha256_final(sctx, out, 28); 154 __sha256_final(sctx, out, 28);
155 } 155 }
156 EXPORT_SYMBOL(sha224_final); 156 EXPORT_SYMBOL(sha224_final);
157 157
158 void sha256(const u8 *data, unsigned int len, 158 void sha256(const u8 *data, unsigned int len, u8 *out)
159 { 159 {
160 struct sha256_state sctx; 160 struct sha256_state sctx;
161 161
162 sha256_init(&sctx); 162 sha256_init(&sctx);
163 sha256_update(&sctx, data, len); 163 sha256_update(&sctx, data, len);
164 sha256_final(&sctx, out); 164 sha256_final(&sctx, out);
165 } 165 }
166 EXPORT_SYMBOL(sha256); 166 EXPORT_SYMBOL(sha256);
167 167
168 MODULE_DESCRIPTION("SHA-256 Algorithm"); 168 MODULE_DESCRIPTION("SHA-256 Algorithm");
169 MODULE_LICENSE("GPL"); 169 MODULE_LICENSE("GPL");
170 170
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.