]>
Commit | Line | Data |
---|---|---|
f5b7f9e2 TW |
1 | /* |
2 | * public domain sha256 crypt implementation | |
3 | * | |
4 | * original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt | |
5 | * in this implementation at least 32bit int is assumed, | |
6 | * key length is limited, the $5$ prefix is mandatory, '\n' and ':' is rejected | |
7 | * in the salt and rounds= setting must contain a valid iteration count, | |
8 | * on error "*" is returned. | |
9 | */ | |
10 | #include <ctype.h> | |
11 | #include <stdlib.h> | |
12 | #include <stdio.h> | |
13 | #include <string.h> | |
14 | #include <stdint.h> | |
15 | ||
16 | #include "sha256.h" | |
17 | ||
18 | /* public domain sha256 implementation based on fips180-3 */ | |
19 | ||
20 | struct sha256 { | |
21 | uint64_t len; /* processed message length */ | |
22 | uint32_t h[8]; /* hash state */ | |
23 | uint8_t buf[64]; /* message block buffer */ | |
24 | }; | |
25 | ||
26 | static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); } | |
27 | #define Ch(x,y,z) (z ^ (x & (y ^ z))) | |
28 | #define Maj(x,y,z) ((x & y) | (z & (x | y))) | |
29 | #define S0(x) (ror(x,2) ^ ror(x,13) ^ ror(x,22)) | |
30 | #define S1(x) (ror(x,6) ^ ror(x,11) ^ ror(x,25)) | |
31 | #define R0(x) (ror(x,7) ^ ror(x,18) ^ (x>>3)) | |
32 | #define R1(x) (ror(x,17) ^ ror(x,19) ^ (x>>10)) | |
33 | ||
34 | static const uint32_t K[64] = { | |
35 | 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, | |
36 | 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, | |
37 | 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, | |
38 | 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, | |
39 | 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, | |
40 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, | |
41 | 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, | |
42 | 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 | |
43 | }; | |
44 | ||
45 | static void processblock(struct sha256 *s, const uint8_t *buf) | |
46 | { | |
47 | uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h; | |
48 | int i; | |
49 | ||
50 | for (i = 0; i < 16; i++) { | |
51 | W[i] = (uint32_t)buf[4*i]<<24; | |
52 | W[i] |= (uint32_t)buf[4*i+1]<<16; | |
53 | W[i] |= (uint32_t)buf[4*i+2]<<8; | |
54 | W[i] |= buf[4*i+3]; | |
55 | } | |
56 | for (; i < 64; i++) | |
57 | W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16]; | |
58 | a = s->h[0]; | |
59 | b = s->h[1]; | |
60 | c = s->h[2]; | |
61 | d = s->h[3]; | |
62 | e = s->h[4]; | |
63 | f = s->h[5]; | |
64 | g = s->h[6]; | |
65 | h = s->h[7]; | |
66 | for (i = 0; i < 64; i++) { | |
67 | t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i]; | |
68 | t2 = S0(a) + Maj(a,b,c); | |
69 | h = g; | |
70 | g = f; | |
71 | f = e; | |
72 | e = d + t1; | |
73 | d = c; | |
74 | c = b; | |
75 | b = a; | |
76 | a = t1 + t2; | |
77 | } | |
78 | s->h[0] += a; | |
79 | s->h[1] += b; | |
80 | s->h[2] += c; | |
81 | s->h[3] += d; | |
82 | s->h[4] += e; | |
83 | s->h[5] += f; | |
84 | s->h[6] += g; | |
85 | s->h[7] += h; | |
86 | } | |
87 | ||
88 | static void pad(struct sha256 *s) | |
89 | { | |
90 | unsigned r = s->len % 64; | |
91 | ||
92 | s->buf[r++] = 0x80; | |
93 | if (r > 56) { | |
94 | memset(s->buf + r, 0, 64 - r); | |
95 | r = 0; | |
96 | processblock(s, s->buf); | |
97 | } | |
98 | memset(s->buf + r, 0, 56 - r); | |
99 | s->len *= 8; | |
100 | s->buf[56] = s->len >> 56; | |
101 | s->buf[57] = s->len >> 48; | |
102 | s->buf[58] = s->len >> 40; | |
103 | s->buf[59] = s->len >> 32; | |
104 | s->buf[60] = s->len >> 24; | |
105 | s->buf[61] = s->len >> 16; | |
106 | s->buf[62] = s->len >> 8; | |
107 | s->buf[63] = s->len; | |
108 | processblock(s, s->buf); | |
109 | } | |
110 | ||
111 | static void sha256_init(struct sha256 *s) | |
112 | { | |
113 | s->len = 0; | |
114 | s->h[0] = 0x6a09e667; | |
115 | s->h[1] = 0xbb67ae85; | |
116 | s->h[2] = 0x3c6ef372; | |
117 | s->h[3] = 0xa54ff53a; | |
118 | s->h[4] = 0x510e527f; | |
119 | s->h[5] = 0x9b05688c; | |
120 | s->h[6] = 0x1f83d9ab; | |
121 | s->h[7] = 0x5be0cd19; | |
122 | } | |
123 | ||
124 | static void sha256_sum(struct sha256 *s, uint8_t *md) | |
125 | { | |
126 | int i; | |
127 | ||
128 | pad(s); | |
129 | for (i = 0; i < 8; i++) { | |
130 | md[4*i] = s->h[i] >> 24; | |
131 | md[4*i+1] = s->h[i] >> 16; | |
132 | md[4*i+2] = s->h[i] >> 8; | |
133 | md[4*i+3] = s->h[i]; | |
134 | } | |
135 | } | |
136 | ||
137 | static void sha256_update(struct sha256 *s, const void *m, unsigned long len) | |
138 | { | |
139 | const uint8_t *p = m; | |
140 | unsigned r = s->len % 64; | |
141 | ||
142 | s->len += len; | |
143 | if (r) { | |
144 | if (len < 64 - r) { | |
145 | memcpy(s->buf + r, p, len); | |
146 | return; | |
147 | } | |
148 | memcpy(s->buf + r, p, 64 - r); | |
149 | len -= 64 - r; | |
150 | p += 64 - r; | |
151 | processblock(s, s->buf); | |
152 | } | |
153 | for (; len >= 64; len -= 64, p += 64) | |
154 | processblock(s, p); | |
155 | memcpy(s->buf, p, len); | |
156 | } | |
157 | ||
158 | void ul_SHA256(unsigned char hash_out[UL_SHA256LENGTH], const unsigned char *str, size_t len) { | |
159 | struct sha256 state = {}; | |
160 | sha256_init(&state); | |
161 | sha256_update(&state, str, len); | |
162 | sha256_sum(&state, hash_out); | |
163 | } |