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