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 */
24int 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 */
48static 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 */
110static int sha512_compress(struct sha512_state *md, unsigned char *buf)
111{
112	u64 S[8], W[80], t0, t1;
113	int i;
114
115	/* copy state into S */
116	for (i = 0; i < 8; i++) {
117		S[i] = md->state[i];
118	}
119
120	/* copy the state into 1024-bits into W[0..15] */
121	for (i = 0; i < 16; i++)
122		W[i] = WPA_GET_BE64(buf + (8 * i));
123
124	/* fill W[16..79] */
125	for (i = 16; i < 80; i++) {
126		W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
127			W[i - 16];
128	}
129
130	/* Compress */
131	for (i = 0; i < 80; i++) {
132		t0 = S[7] + Sigma1(S[4]) + Ch(S[4], S[5], S[6]) + K[i] + W[i];
133		t1 = Sigma0(S[0]) + Maj(S[0], S[1], S[2]);
134		S[7] = S[6];
135		S[6] = S[5];
136		S[5] = S[4];
137		S[4] = S[3] + t0;
138		S[3] = S[2];
139		S[2] = S[1];
140		S[1] = S[0];
141		S[0] = t0 + t1;
142	}
143
144	/* feedback */
145	for (i = 0; i < 8; i++) {
146		md->state[i] = md->state[i] + S[i];
147	}
148
149	return 0;
150}
151
152
153/**
154   Initialize the hash state
155   @param md   The hash state you wish to initialize
156   @return CRYPT_OK if successful
157*/
158void sha512_init(struct sha512_state *md)
159{
160	md->curlen = 0;
161	md->length = 0;
162	md->state[0] = CONST64(0x6a09e667f3bcc908);
163	md->state[1] = CONST64(0xbb67ae8584caa73b);
164	md->state[2] = CONST64(0x3c6ef372fe94f82b);
165	md->state[3] = CONST64(0xa54ff53a5f1d36f1);
166	md->state[4] = CONST64(0x510e527fade682d1);
167	md->state[5] = CONST64(0x9b05688c2b3e6c1f);
168	md->state[6] = CONST64(0x1f83d9abfb41bd6b);
169	md->state[7] = CONST64(0x5be0cd19137e2179);
170}
171
172
173/**
174   Process a block of memory though the hash
175   @param md     The hash state
176   @param in     The data to hash
177   @param inlen  The length of the data (octets)
178   @return CRYPT_OK if successful
179*/
180int sha512_process(struct sha512_state *md, const unsigned char *in,
181		   unsigned long inlen)
182{
183	unsigned long n;
184
185	if (md->curlen >= sizeof(md->buf))
186		return -1;
187
188	while (inlen > 0) {
189		if (md->curlen == 0 && inlen >= SHA512_BLOCK_SIZE) {
190			if (sha512_compress(md, (unsigned char *) in) < 0)
191				return -1;
192			md->length += SHA512_BLOCK_SIZE * 8;
193			in += SHA512_BLOCK_SIZE;
194			inlen -= SHA512_BLOCK_SIZE;
195		} else {
196			n = MIN(inlen, (SHA512_BLOCK_SIZE - md->curlen));
197			os_memcpy(md->buf + md->curlen, in, n);
198			md->curlen += n;
199			in += n;
200			inlen -= n;
201			if (md->curlen == SHA512_BLOCK_SIZE) {
202				if (sha512_compress(md, md->buf) < 0)
203					return -1;
204				md->length += 8 * SHA512_BLOCK_SIZE;
205				md->curlen = 0;
206			}
207		}
208	}
209
210	return 0;
211}
212
213
214/**
215   Terminate the hash to get the digest
216   @param md  The hash state
217   @param out [out] The destination of the hash (64 bytes)
218   @return CRYPT_OK if successful
219*/
220int sha512_done(struct sha512_state *md, unsigned char *out)
221{
222	int i;
223
224	if (md->curlen >= sizeof(md->buf))
225		return -1;
226
227	/* increase the length of the message */
228	md->length += md->curlen * CONST64(8);
229
230	/* append the '1' bit */
231	md->buf[md->curlen++] = (unsigned char) 0x80;
232
233	/* if the length is currently above 112 bytes we append zeros
234	 * then compress.  Then we can fall back to padding zeros and length
235	 * encoding like normal.
236	 */
237	if (md->curlen > 112) {
238		while (md->curlen < 128) {
239			md->buf[md->curlen++] = (unsigned char) 0;
240		}
241		sha512_compress(md, md->buf);
242		md->curlen = 0;
243	}
244
245	/* pad upto 120 bytes of zeroes
246	 * note: that from 112 to 120 is the 64 MSB of the length.  We assume
247	 * that you won't hash > 2^64 bits of data... :-)
248	 */
249	while (md->curlen < 120) {
250		md->buf[md->curlen++] = (unsigned char) 0;
251	}
252
253	/* store length */
254	WPA_PUT_BE64(md->buf + 120, md->length);
255	sha512_compress(md, md->buf);
256
257	/* copy output */
258	for (i = 0; i < 8; i++)
259		WPA_PUT_BE64(out + (8 * i), md->state[i]);
260
261	return 0;
262}
263
264/* ===== end - public domain SHA512 implementation ===== */
265