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  
101  #define ROR64c(x, y) \
102      ( ((((x) & CONST64(0xFFFFFFFFFFFFFFFF)) >> ((u64) (y) & CONST64(63))) | \
103        ((x) << ((u64) (64 - ((y) & CONST64(63)))))) & \
104        CONST64(0xFFFFFFFFFFFFFFFF))
105  
106  /* compress 1024-bits */
sha512_compress(struct sha512_state * md,unsigned char * buf)107  static int sha512_compress(struct sha512_state *md, unsigned char *buf)
108  {
109  	u64 S[8], t0, t1;
110  	u64 *W;
111  	int i;
112  
113  	W = os_malloc(80 * sizeof(u64));
114  	if (!W)
115  		return -1;
116  
117  	/* copy state into S */
118  	for (i = 0; i < 8; i++) {
119  		S[i] = md->state[i];
120  	}
121  
122  	/* copy the state into 1024-bits into W[0..15] */
123  	for (i = 0; i < 16; i++)
124  		W[i] = WPA_GET_BE64(buf + (8 * i));
125  
126  	/* fill W[16..79] */
127  	for (i = 16; i < 80; i++) {
128  		W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
129  			W[i - 16];
130  	}
131  
132  	/* Compress */
133  	for (i = 0; i < 80; i++) {
134  		t0 = S[7] + Sigma1(S[4]) + Ch(S[4], S[5], S[6]) + K[i] + W[i];
135  		t1 = Sigma0(S[0]) + Maj(S[0], S[1], S[2]);
136  		S[7] = S[6];
137  		S[6] = S[5];
138  		S[5] = S[4];
139  		S[4] = S[3] + t0;
140  		S[3] = S[2];
141  		S[2] = S[1];
142  		S[1] = S[0];
143  		S[0] = t0 + t1;
144  	}
145  
146  	/* feedback */
147  	for (i = 0; i < 8; i++) {
148  		md->state[i] = md->state[i] + S[i];
149  	}
150  
151  	os_free(W);
152  	return 0;
153  }
154  
155  
156  /**
157     Initialize the hash state
158     @param md   The hash state you wish to initialize
159     @return CRYPT_OK if successful
160  */
sha512_init(struct sha512_state * md)161  void sha512_init(struct sha512_state *md)
162  {
163  	md->curlen = 0;
164  	md->length = 0;
165  	md->state[0] = CONST64(0x6a09e667f3bcc908);
166  	md->state[1] = CONST64(0xbb67ae8584caa73b);
167  	md->state[2] = CONST64(0x3c6ef372fe94f82b);
168  	md->state[3] = CONST64(0xa54ff53a5f1d36f1);
169  	md->state[4] = CONST64(0x510e527fade682d1);
170  	md->state[5] = CONST64(0x9b05688c2b3e6c1f);
171  	md->state[6] = CONST64(0x1f83d9abfb41bd6b);
172  	md->state[7] = CONST64(0x5be0cd19137e2179);
173  }
174  
175  
176  /**
177     Process a block of memory though the hash
178     @param md     The hash state
179     @param in     The data to hash
180     @param inlen  The length of the data (octets)
181     @return CRYPT_OK if successful
182  */
sha512_process(struct sha512_state * md,const unsigned char * in,unsigned long inlen)183  int sha512_process(struct sha512_state *md, const unsigned char *in,
184  		   unsigned long inlen)
185  {
186  	unsigned long n;
187  
188  	if (md->curlen >= sizeof(md->buf))
189  		return -1;
190  
191  	while (inlen > 0) {
192  		if (md->curlen == 0 && inlen >= SHA512_BLOCK_SIZE) {
193  			if (sha512_compress(md, (unsigned char *) in) < 0)
194  				return -1;
195  			md->length += SHA512_BLOCK_SIZE * 8;
196  			in += SHA512_BLOCK_SIZE;
197  			inlen -= SHA512_BLOCK_SIZE;
198  		} else {
199  			n = MIN(inlen, (SHA512_BLOCK_SIZE - md->curlen));
200  			os_memcpy(md->buf + md->curlen, in, n);
201  			md->curlen += n;
202  			in += n;
203  			inlen -= n;
204  			if (md->curlen == SHA512_BLOCK_SIZE) {
205  				if (sha512_compress(md, md->buf) < 0)
206  					return -1;
207  				md->length += 8 * SHA512_BLOCK_SIZE;
208  				md->curlen = 0;
209  			}
210  		}
211  	}
212  
213  	return 0;
214  }
215  
216  
217  /**
218     Terminate the hash to get the digest
219     @param md  The hash state
220     @param out [out] The destination of the hash (64 bytes)
221     @return CRYPT_OK if successful
222  */
sha512_done(struct sha512_state * md,unsigned char * out)223  int sha512_done(struct sha512_state *md, unsigned char *out)
224  {
225  	int i;
226  
227  	if (md->curlen >= sizeof(md->buf))
228  		return -1;
229  
230  	/* increase the length of the message */
231  	md->length += md->curlen * CONST64(8);
232  
233  	/* append the '1' bit */
234  	md->buf[md->curlen++] = (unsigned char) 0x80;
235  
236  	/* if the length is currently above 112 bytes we append zeros
237  	 * then compress.  Then we can fall back to padding zeros and length
238  	 * encoding like normal.
239  	 */
240  	if (md->curlen > 112) {
241  		while (md->curlen < 128) {
242  			md->buf[md->curlen++] = (unsigned char) 0;
243  		}
244  		sha512_compress(md, md->buf);
245  		md->curlen = 0;
246  	}
247  
248  	/* pad up to 120 bytes of zeroes
249  	 * note: that from 112 to 120 is the 64 MSB of the length.  We assume
250  	 * that you won't hash > 2^64 bits of data... :-)
251  	 */
252  	while (md->curlen < 120) {
253  		md->buf[md->curlen++] = (unsigned char) 0;
254  	}
255  
256  	/* store length */
257  	WPA_PUT_BE64(md->buf + 120, md->length);
258  	sha512_compress(md, md->buf);
259  
260  	/* copy output */
261  	for (i = 0; i < 8; i++)
262  		WPA_PUT_BE64(out + (8 * i), md->state[i]);
263  
264  	return 0;
265  }
266  
267  /* ===== end - public domain SHA512 implementation ===== */
268