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/bitops.h>
15 #include <crypto/sha256_base.h> !! 15 #include <linux/export.h>
16 #include <linux/kernel.h> <<
17 #include <linux/module.h> 16 #include <linux/module.h>
18 #include <linux/string.h> 17 #include <linux/string.h>
>> 18 #include <crypto/sha2.h>
>> 19 #include <asm/unaligned.h>
19 20
20 static const u32 SHA256_K[] = { 21 static const u32 SHA256_K[] = {
21 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0x 22 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
22 0x3956c25b, 0x59f111f1, 0x923f82a4, 0x 23 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
23 0xd807aa98, 0x12835b01, 0x243185be, 0x 24 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
24 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0x 25 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
25 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x 26 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
26 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x 27 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
27 0x983e5152, 0xa831c66d, 0xb00327c8, 0x 28 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
28 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x 29 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
29 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x 30 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
30 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x 31 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
31 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0x 32 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
32 0xd192e819, 0xd6990624, 0xf40e3585, 0x 33 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
33 0x19a4c116, 0x1e376c08, 0x2748774c, 0x 34 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
34 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x 35 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
35 0x748f82ee, 0x78a5636f, 0x84c87814, 0x 36 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
36 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0x 37 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
37 }; 38 };
38 39
39 static inline u32 Ch(u32 x, u32 y, u32 z) 40 static inline u32 Ch(u32 x, u32 y, u32 z)
40 { 41 {
41 return z ^ (x & (y ^ z)); 42 return z ^ (x & (y ^ z));
42 } 43 }
43 44
44 static inline u32 Maj(u32 x, u32 y, u32 z) 45 static inline u32 Maj(u32 x, u32 y, u32 z)
45 { 46 {
46 return (x & y) | (z & (x | y)); 47 return (x & y) | (z & (x | y));
47 } 48 }
48 49
49 #define e0(x) (ror32(x, 2) ^ ror32(x, 13 50 #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
50 #define e1(x) (ror32(x, 6) ^ ror32(x, 11 51 #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
51 #define s0(x) (ror32(x, 7) ^ ror32(x, 18 52 #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
52 #define s1(x) (ror32(x, 17) ^ ror32(x, 1 53 #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
53 54
54 static inline void LOAD_OP(int I, u32 *W, cons 55 static inline void LOAD_OP(int I, u32 *W, const u8 *input)
55 { 56 {
56 W[I] = get_unaligned_be32((__u32 *)inp 57 W[I] = get_unaligned_be32((__u32 *)input + I);
57 } 58 }
58 59
59 static inline void BLEND_OP(int I, u32 *W) 60 static inline void BLEND_OP(int I, u32 *W)
60 { 61 {
61 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15 62 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
62 } 63 }
63 64
64 #define SHA256_ROUND(i, a, b, c, d, e, f, g, h 65 #define SHA256_ROUND(i, a, b, c, d, e, f, g, h) do { \
65 u32 t1, t2; 66 u32 t1, t2; \
66 t1 = h + e1(e) + Ch(e, f, g) + SHA256_ 67 t1 = h + e1(e) + Ch(e, f, g) + SHA256_K[i] + W[i]; \
67 t2 = e0(a) + Maj(a, b, c); 68 t2 = e0(a) + Maj(a, b, c); \
68 d += t1; 69 d += t1; \
69 h = t1 + t2; 70 h = t1 + t2; \
70 } while (0) 71 } while (0)
71 72
72 static void sha256_transform(u32 *state, const 73 static void sha256_transform(u32 *state, const u8 *input, u32 *W)
73 { 74 {
74 u32 a, b, c, d, e, f, g, h; 75 u32 a, b, c, d, e, f, g, h;
75 int i; 76 int i;
76 77
77 /* load the input */ 78 /* load the input */
78 for (i = 0; i < 16; i += 8) { 79 for (i = 0; i < 16; i += 8) {
79 LOAD_OP(i + 0, W, input); 80 LOAD_OP(i + 0, W, input);
80 LOAD_OP(i + 1, W, input); 81 LOAD_OP(i + 1, W, input);
81 LOAD_OP(i + 2, W, input); 82 LOAD_OP(i + 2, W, input);
82 LOAD_OP(i + 3, W, input); 83 LOAD_OP(i + 3, W, input);
83 LOAD_OP(i + 4, W, input); 84 LOAD_OP(i + 4, W, input);
84 LOAD_OP(i + 5, W, input); 85 LOAD_OP(i + 5, W, input);
85 LOAD_OP(i + 6, W, input); 86 LOAD_OP(i + 6, W, input);
86 LOAD_OP(i + 7, W, input); 87 LOAD_OP(i + 7, W, input);
87 } 88 }
88 89
89 /* now blend */ 90 /* now blend */
90 for (i = 16; i < 64; i += 8) { 91 for (i = 16; i < 64; i += 8) {
91 BLEND_OP(i + 0, W); 92 BLEND_OP(i + 0, W);
92 BLEND_OP(i + 1, W); 93 BLEND_OP(i + 1, W);
93 BLEND_OP(i + 2, W); 94 BLEND_OP(i + 2, W);
94 BLEND_OP(i + 3, W); 95 BLEND_OP(i + 3, W);
95 BLEND_OP(i + 4, W); 96 BLEND_OP(i + 4, W);
96 BLEND_OP(i + 5, W); 97 BLEND_OP(i + 5, W);
97 BLEND_OP(i + 6, W); 98 BLEND_OP(i + 6, W);
98 BLEND_OP(i + 7, W); 99 BLEND_OP(i + 7, W);
99 } 100 }
100 101
101 /* load the state into our registers * 102 /* load the state into our registers */
102 a = state[0]; b = state[1]; c = stat 103 a = state[0]; b = state[1]; c = state[2]; d = state[3];
103 e = state[4]; f = state[5]; g = stat 104 e = state[4]; f = state[5]; g = state[6]; h = state[7];
104 105
105 /* now iterate */ 106 /* now iterate */
106 for (i = 0; i < 64; i += 8) { 107 for (i = 0; i < 64; i += 8) {
107 SHA256_ROUND(i + 0, a, b, c, d 108 SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h);
108 SHA256_ROUND(i + 1, h, a, b, c 109 SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g);
109 SHA256_ROUND(i + 2, g, h, a, b 110 SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f);
110 SHA256_ROUND(i + 3, f, g, h, a 111 SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e);
111 SHA256_ROUND(i + 4, e, f, g, h 112 SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d);
112 SHA256_ROUND(i + 5, d, e, f, g 113 SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c);
113 SHA256_ROUND(i + 6, c, d, e, f 114 SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b);
114 SHA256_ROUND(i + 7, b, c, d, e 115 SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a);
115 } 116 }
116 117
117 state[0] += a; state[1] += b; state[2] 118 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
118 state[4] += e; state[5] += f; state[6] 119 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
119 } 120 }
120 121
121 static void sha256_transform_blocks(struct sha !! 122 void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
122 const u8 * <<
123 { 123 {
>> 124 unsigned int partial, done;
>> 125 const u8 *src;
124 u32 W[64]; 126 u32 W[64];
125 127
126 do { !! 128 partial = sctx->count & 0x3f;
127 sha256_transform(sctx->state, !! 129 sctx->count += len;
128 input += SHA256_BLOCK_SIZE; !! 130 done = 0;
129 } while (--blocks); !! 131 src = data;
>> 132
>> 133 if ((partial + len) > 63) {
>> 134 if (partial) {
>> 135 done = -partial;
>> 136 memcpy(sctx->buf + partial, data, done + 64);
>> 137 src = sctx->buf;
>> 138 }
>> 139
>> 140 do {
>> 141 sha256_transform(sctx->state, src, W);
>> 142 done += 64;
>> 143 src = data + done;
>> 144 } while (done + 63 < len);
>> 145
>> 146 memzero_explicit(W, sizeof(W));
130 147
131 memzero_explicit(W, sizeof(W)); !! 148 partial = 0;
>> 149 }
>> 150 memcpy(sctx->buf + partial, src, len - done);
132 } 151 }
>> 152 EXPORT_SYMBOL(sha256_update);
133 153
134 void sha256_update(struct sha256_state *sctx, !! 154 void sha224_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
135 { 155 {
136 lib_sha256_base_do_update(sctx, data, !! 156 sha256_update(sctx, data, len);
137 } 157 }
138 EXPORT_SYMBOL(sha256_update); !! 158 EXPORT_SYMBOL(sha224_update);
139 159
140 static void __sha256_final(struct sha256_state !! 160 static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_words)
141 { 161 {
142 lib_sha256_base_do_finalize(sctx, sha2 !! 162 __be32 *dst = (__be32 *)out;
143 lib_sha256_base_finish(sctx, out, dige !! 163 __be64 bits;
>> 164 unsigned int index, pad_len;
>> 165 int i;
>> 166 static const u8 padding[64] = { 0x80, };
>> 167
>> 168 /* Save number of bits */
>> 169 bits = cpu_to_be64(sctx->count << 3);
>> 170
>> 171 /* Pad out to 56 mod 64. */
>> 172 index = sctx->count & 0x3f;
>> 173 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
>> 174 sha256_update(sctx, padding, pad_len);
>> 175
>> 176 /* Append length (before padding) */
>> 177 sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
>> 178
>> 179 /* Store state in digest */
>> 180 for (i = 0; i < digest_words; i++)
>> 181 put_unaligned_be32(sctx->state[i], &dst[i]);
>> 182
>> 183 /* Zeroize sensitive information. */
>> 184 memzero_explicit(sctx, sizeof(*sctx));
144 } 185 }
145 186
146 void sha256_final(struct sha256_state *sctx, u 187 void sha256_final(struct sha256_state *sctx, u8 *out)
147 { 188 {
148 __sha256_final(sctx, out, 32); !! 189 __sha256_final(sctx, out, 8);
149 } 190 }
150 EXPORT_SYMBOL(sha256_final); 191 EXPORT_SYMBOL(sha256_final);
151 192
152 void sha224_final(struct sha256_state *sctx, u 193 void sha224_final(struct sha256_state *sctx, u8 *out)
153 { 194 {
154 __sha256_final(sctx, out, 28); !! 195 __sha256_final(sctx, out, 7);
155 } 196 }
156 EXPORT_SYMBOL(sha224_final); 197 EXPORT_SYMBOL(sha224_final);
157 198
158 void sha256(const u8 *data, unsigned int len, 199 void sha256(const u8 *data, unsigned int len, u8 *out)
159 { 200 {
160 struct sha256_state sctx; 201 struct sha256_state sctx;
161 202
162 sha256_init(&sctx); 203 sha256_init(&sctx);
163 sha256_update(&sctx, data, len); 204 sha256_update(&sctx, data, len);
164 sha256_final(&sctx, out); 205 sha256_final(&sctx, out);
165 } 206 }
166 EXPORT_SYMBOL(sha256); 207 EXPORT_SYMBOL(sha256);
167 208
168 MODULE_DESCRIPTION("SHA-256 Algorithm"); <<
169 MODULE_LICENSE("GPL"); 209 MODULE_LICENSE("GPL");
170 210
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