1 /*
2 * SHA-512 hash implementation and interface functions
3 * Copyright (c) 2015, Pali Rohár <pali.rohar@gmail.com>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "sha512_i.h"
13 #include "crypto.h"
14
15
16 /**
17 * sha512_vector - SHA512 hash for data vector
18 * @num_elem: Number of elements in the data vector
19 * @addr: Pointers to the data areas
20 * @len: Lengths of the data blocks
21 * @mac: Buffer for the hash
22 * Returns: 0 on success, -1 of failure
23 */
sha512_vector(size_t num_elem,const u8 * addr[],const size_t * len,u8 * mac)24 int sha512_vector(size_t num_elem, const u8 *addr[], const size_t *len,
25 u8 *mac)
26 {
27 struct sha512_state ctx;
28 size_t i;
29
30 sha512_init(&ctx);
31 for (i = 0; i < num_elem; i++)
32 if (sha512_process(&ctx, addr[i], len[i]))
33 return -1;
34 if (sha512_done(&ctx, mac))
35 return -1;
36 return 0;
37 }
38
39
40 /* ===== start - public domain SHA512 implementation ===== */
41
42 /* This is based on SHA512 implementation in LibTomCrypt that was released into
43 * public domain by Tom St Denis. */
44
45 #define CONST64(n) n ## ULL
46
47 /* the K array */
48 static const u64 K[80] = {
49 CONST64(0x428a2f98d728ae22), CONST64(0x7137449123ef65cd),
50 CONST64(0xb5c0fbcfec4d3b2f), CONST64(0xe9b5dba58189dbbc),
51 CONST64(0x3956c25bf348b538), CONST64(0x59f111f1b605d019),
52 CONST64(0x923f82a4af194f9b), CONST64(0xab1c5ed5da6d8118),
53 CONST64(0xd807aa98a3030242), CONST64(0x12835b0145706fbe),
54 CONST64(0x243185be4ee4b28c), CONST64(0x550c7dc3d5ffb4e2),
55 CONST64(0x72be5d74f27b896f), CONST64(0x80deb1fe3b1696b1),
56 CONST64(0x9bdc06a725c71235), CONST64(0xc19bf174cf692694),
57 CONST64(0xe49b69c19ef14ad2), CONST64(0xefbe4786384f25e3),
58 CONST64(0x0fc19dc68b8cd5b5), CONST64(0x240ca1cc77ac9c65),
59 CONST64(0x2de92c6f592b0275), CONST64(0x4a7484aa6ea6e483),
60 CONST64(0x5cb0a9dcbd41fbd4), CONST64(0x76f988da831153b5),
61 CONST64(0x983e5152ee66dfab), CONST64(0xa831c66d2db43210),
62 CONST64(0xb00327c898fb213f), CONST64(0xbf597fc7beef0ee4),
63 CONST64(0xc6e00bf33da88fc2), CONST64(0xd5a79147930aa725),
64 CONST64(0x06ca6351e003826f), CONST64(0x142929670a0e6e70),
65 CONST64(0x27b70a8546d22ffc), CONST64(0x2e1b21385c26c926),
66 CONST64(0x4d2c6dfc5ac42aed), CONST64(0x53380d139d95b3df),
67 CONST64(0x650a73548baf63de), CONST64(0x766a0abb3c77b2a8),
68 CONST64(0x81c2c92e47edaee6), CONST64(0x92722c851482353b),
69 CONST64(0xa2bfe8a14cf10364), CONST64(0xa81a664bbc423001),
70 CONST64(0xc24b8b70d0f89791), CONST64(0xc76c51a30654be30),
71 CONST64(0xd192e819d6ef5218), CONST64(0xd69906245565a910),
72 CONST64(0xf40e35855771202a), CONST64(0x106aa07032bbd1b8),
73 CONST64(0x19a4c116b8d2d0c8), CONST64(0x1e376c085141ab53),
74 CONST64(0x2748774cdf8eeb99), CONST64(0x34b0bcb5e19b48a8),
75 CONST64(0x391c0cb3c5c95a63), CONST64(0x4ed8aa4ae3418acb),
76 CONST64(0x5b9cca4f7763e373), CONST64(0x682e6ff3d6b2b8a3),
77 CONST64(0x748f82ee5defb2fc), CONST64(0x78a5636f43172f60),
78 CONST64(0x84c87814a1f0ab72), CONST64(0x8cc702081a6439ec),
79 CONST64(0x90befffa23631e28), CONST64(0xa4506cebde82bde9),
80 CONST64(0xbef9a3f7b2c67915), CONST64(0xc67178f2e372532b),
81 CONST64(0xca273eceea26619c), CONST64(0xd186b8c721c0c207),
82 CONST64(0xeada7dd6cde0eb1e), CONST64(0xf57d4f7fee6ed178),
83 CONST64(0x06f067aa72176fba), CONST64(0x0a637dc5a2c898a6),
84 CONST64(0x113f9804bef90dae), CONST64(0x1b710b35131c471b),
85 CONST64(0x28db77f523047d84), CONST64(0x32caab7b40c72493),
86 CONST64(0x3c9ebe0a15c9bebc), CONST64(0x431d67c49c100d4c),
87 CONST64(0x4cc5d4becb3e42b6), CONST64(0x597f299cfc657e2a),
88 CONST64(0x5fcb6fab3ad6faec), CONST64(0x6c44198c4a475817)
89 };
90
91 /* Various logical functions */
92 #define Ch(x,y,z) (z ^ (x & (y ^ z)))
93 #define Maj(x,y,z) (((x | y) & z) | (x & y))
94 #define S(x, n) ROR64c(x, n)
95 #define R(x, n) (((x) & CONST64(0xFFFFFFFFFFFFFFFF)) >> ((u64) n))
96 #define Sigma0(x) (S(x, 28) ^ S(x, 34) ^ S(x, 39))
97 #define Sigma1(x) (S(x, 14) ^ S(x, 18) ^ S(x, 41))
98 #define Gamma0(x) (S(x, 1) ^ S(x, 8) ^ R(x, 7))
99 #define Gamma1(x) (S(x, 19) ^ S(x, 61) ^ R(x, 6))
100 #ifndef MIN
101 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
102 #endif
103
104 #define ROR64c(x, y) \
105 ( ((((x) & CONST64(0xFFFFFFFFFFFFFFFF)) >> ((u64) (y) & CONST64(63))) | \
106 ((x) << ((u64) (64 - ((y) & CONST64(63)))))) & \
107 CONST64(0xFFFFFFFFFFFFFFFF))
108
109 /* compress 1024-bits */
sha512_compress(struct sha512_state * md,unsigned char * buf)110 static int sha512_compress(struct sha512_state *md, unsigned char *buf)
111 {
112 u64 S[8], t0, t1;
113 u64 *W;
114 int i;
115
116 W = os_malloc(80 * sizeof(u64));
117 if (!W)
118 return -1;
119
120 /* copy state into S */
121 for (i = 0; i < 8; i++) {
122 S[i] = md->state[i];
123 }
124
125 /* copy the state into 1024-bits into W[0..15] */
126 for (i = 0; i < 16; i++)
127 W[i] = WPA_GET_BE64(buf + (8 * i));
128
129 /* fill W[16..79] */
130 for (i = 16; i < 80; i++) {
131 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
132 W[i - 16];
133 }
134
135 /* Compress */
136 for (i = 0; i < 80; i++) {
137 t0 = S[7] + Sigma1(S[4]) + Ch(S[4], S[5], S[6]) + K[i] + W[i];
138 t1 = Sigma0(S[0]) + Maj(S[0], S[1], S[2]);
139 S[7] = S[6];
140 S[6] = S[5];
141 S[5] = S[4];
142 S[4] = S[3] + t0;
143 S[3] = S[2];
144 S[2] = S[1];
145 S[1] = S[0];
146 S[0] = t0 + t1;
147 }
148
149 /* feedback */
150 for (i = 0; i < 8; i++) {
151 md->state[i] = md->state[i] + S[i];
152 }
153
154 os_free(W);
155 return 0;
156 }
157
158
159 /**
160 Initialize the hash state
161 @param md The hash state you wish to initialize
162 @return CRYPT_OK if successful
163 */
sha512_init(struct sha512_state * md)164 void sha512_init(struct sha512_state *md)
165 {
166 md->curlen = 0;
167 md->length = 0;
168 md->state[0] = CONST64(0x6a09e667f3bcc908);
169 md->state[1] = CONST64(0xbb67ae8584caa73b);
170 md->state[2] = CONST64(0x3c6ef372fe94f82b);
171 md->state[3] = CONST64(0xa54ff53a5f1d36f1);
172 md->state[4] = CONST64(0x510e527fade682d1);
173 md->state[5] = CONST64(0x9b05688c2b3e6c1f);
174 md->state[6] = CONST64(0x1f83d9abfb41bd6b);
175 md->state[7] = CONST64(0x5be0cd19137e2179);
176 }
177
178
179 /**
180 Process a block of memory though the hash
181 @param md The hash state
182 @param in The data to hash
183 @param inlen The length of the data (octets)
184 @return CRYPT_OK if successful
185 */
sha512_process(struct sha512_state * md,const unsigned char * in,unsigned long inlen)186 int sha512_process(struct sha512_state *md, const unsigned char *in,
187 unsigned long inlen)
188 {
189 unsigned long n;
190
191 if (md->curlen >= sizeof(md->buf))
192 return -1;
193
194 while (inlen > 0) {
195 if (md->curlen == 0 && inlen >= SHA512_BLOCK_SIZE) {
196 if (sha512_compress(md, (unsigned char *) in) < 0)
197 return -1;
198 md->length += SHA512_BLOCK_SIZE * 8;
199 in += SHA512_BLOCK_SIZE;
200 inlen -= SHA512_BLOCK_SIZE;
201 } else {
202 n = MIN(inlen, (SHA512_BLOCK_SIZE - md->curlen));
203 os_memcpy(md->buf + md->curlen, in, n);
204 md->curlen += n;
205 in += n;
206 inlen -= n;
207 if (md->curlen == SHA512_BLOCK_SIZE) {
208 if (sha512_compress(md, md->buf) < 0)
209 return -1;
210 md->length += 8 * SHA512_BLOCK_SIZE;
211 md->curlen = 0;
212 }
213 }
214 }
215
216 return 0;
217 }
218
219
220 /**
221 Terminate the hash to get the digest
222 @param md The hash state
223 @param out [out] The destination of the hash (64 bytes)
224 @return CRYPT_OK if successful
225 */
sha512_done(struct sha512_state * md,unsigned char * out)226 int sha512_done(struct sha512_state *md, unsigned char *out)
227 {
228 int i;
229
230 if (md->curlen >= sizeof(md->buf))
231 return -1;
232
233 /* increase the length of the message */
234 md->length += md->curlen * CONST64(8);
235
236 /* append the '1' bit */
237 md->buf[md->curlen++] = (unsigned char) 0x80;
238
239 /* if the length is currently above 112 bytes we append zeros
240 * then compress. Then we can fall back to padding zeros and length
241 * encoding like normal.
242 */
243 if (md->curlen > 112) {
244 while (md->curlen < 128) {
245 md->buf[md->curlen++] = (unsigned char) 0;
246 }
247 sha512_compress(md, md->buf);
248 md->curlen = 0;
249 }
250
251 /* pad up to 120 bytes of zeroes
252 * note: that from 112 to 120 is the 64 MSB of the length. We assume
253 * that you won't hash > 2^64 bits of data... :-)
254 */
255 while (md->curlen < 120) {
256 md->buf[md->curlen++] = (unsigned char) 0;
257 }
258
259 /* store length */
260 WPA_PUT_BE64(md->buf + 120, md->length);
261 sha512_compress(md, md->buf);
262
263 /* copy output */
264 for (i = 0; i < 8; i++)
265 WPA_PUT_BE64(out + (8 * i), md->state[i]);
266
267 return 0;
268 }
269
270 /* ===== end - public domain SHA512 implementation ===== */
271