1/* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
10 */
11
12#include "fixedint.h"
13#include "sha512.h"
14
15/* the K array */
16static const uint64_t K[80] = {
17 UINT64_C(0x428a2f98d728ae22), UINT64_C(0x7137449123ef65cd),
18 UINT64_C(0xb5c0fbcfec4d3b2f), UINT64_C(0xe9b5dba58189dbbc),
19 UINT64_C(0x3956c25bf348b538), UINT64_C(0x59f111f1b605d019),
20 UINT64_C(0x923f82a4af194f9b), UINT64_C(0xab1c5ed5da6d8118),
21 UINT64_C(0xd807aa98a3030242), UINT64_C(0x12835b0145706fbe),
22 UINT64_C(0x243185be4ee4b28c), UINT64_C(0x550c7dc3d5ffb4e2),
23 UINT64_C(0x72be5d74f27b896f), UINT64_C(0x80deb1fe3b1696b1),
24 UINT64_C(0x9bdc06a725c71235), UINT64_C(0xc19bf174cf692694),
25 UINT64_C(0xe49b69c19ef14ad2), UINT64_C(0xefbe4786384f25e3),
26 UINT64_C(0x0fc19dc68b8cd5b5), UINT64_C(0x240ca1cc77ac9c65),
27 UINT64_C(0x2de92c6f592b0275), UINT64_C(0x4a7484aa6ea6e483),
28 UINT64_C(0x5cb0a9dcbd41fbd4), UINT64_C(0x76f988da831153b5),
29 UINT64_C(0x983e5152ee66dfab), UINT64_C(0xa831c66d2db43210),
30 UINT64_C(0xb00327c898fb213f), UINT64_C(0xbf597fc7beef0ee4),
31 UINT64_C(0xc6e00bf33da88fc2), UINT64_C(0xd5a79147930aa725),
32 UINT64_C(0x06ca6351e003826f), UINT64_C(0x142929670a0e6e70),
33 UINT64_C(0x27b70a8546d22ffc), UINT64_C(0x2e1b21385c26c926),
34 UINT64_C(0x4d2c6dfc5ac42aed), UINT64_C(0x53380d139d95b3df),
35 UINT64_C(0x650a73548baf63de), UINT64_C(0x766a0abb3c77b2a8),
36 UINT64_C(0x81c2c92e47edaee6), UINT64_C(0x92722c851482353b),
37 UINT64_C(0xa2bfe8a14cf10364), UINT64_C(0xa81a664bbc423001),
38 UINT64_C(0xc24b8b70d0f89791), UINT64_C(0xc76c51a30654be30),
39 UINT64_C(0xd192e819d6ef5218), UINT64_C(0xd69906245565a910),
40 UINT64_C(0xf40e35855771202a), UINT64_C(0x106aa07032bbd1b8),
41 UINT64_C(0x19a4c116b8d2d0c8), UINT64_C(0x1e376c085141ab53),
42 UINT64_C(0x2748774cdf8eeb99), UINT64_C(0x34b0bcb5e19b48a8),
43 UINT64_C(0x391c0cb3c5c95a63), UINT64_C(0x4ed8aa4ae3418acb),
44 UINT64_C(0x5b9cca4f7763e373), UINT64_C(0x682e6ff3d6b2b8a3),
45 UINT64_C(0x748f82ee5defb2fc), UINT64_C(0x78a5636f43172f60),
46 UINT64_C(0x84c87814a1f0ab72), UINT64_C(0x8cc702081a6439ec),
47 UINT64_C(0x90befffa23631e28), UINT64_C(0xa4506cebde82bde9),
48 UINT64_C(0xbef9a3f7b2c67915), UINT64_C(0xc67178f2e372532b),
49 UINT64_C(0xca273eceea26619c), UINT64_C(0xd186b8c721c0c207),
50 UINT64_C(0xeada7dd6cde0eb1e), UINT64_C(0xf57d4f7fee6ed178),
51 UINT64_C(0x06f067aa72176fba), UINT64_C(0x0a637dc5a2c898a6),
52 UINT64_C(0x113f9804bef90dae), UINT64_C(0x1b710b35131c471b),
53 UINT64_C(0x28db77f523047d84), UINT64_C(0x32caab7b40c72493),
54 UINT64_C(0x3c9ebe0a15c9bebc), UINT64_C(0x431d67c49c100d4c),
55 UINT64_C(0x4cc5d4becb3e42b6), UINT64_C(0x597f299cfc657e2a),
56 UINT64_C(0x5fcb6fab3ad6faec), UINT64_C(0x6c44198c4a475817)
57};
58
59/* Various logical functions */
60
61#define ROR64c(x, y) \
62 ( ((((x)&UINT64_C(0xFFFFFFFFFFFFFFFF))>>((uint64_t)(y)&UINT64_C(63))) | \
63 ((x)<<((uint64_t)(64-((y)&UINT64_C(63)))))) & UINT64_C(0xFFFFFFFFFFFFFFFF))
64
65#define STORE64H(x, y) \
66 { (y)[0] = (unsigned char)(((x)>>56)&255); (y)[1] = (unsigned char)(((x)>>48)&255); \
67 (y)[2] = (unsigned char)(((x)>>40)&255); (y)[3] = (unsigned char)(((x)>>32)&255); \
68 (y)[4] = (unsigned char)(((x)>>24)&255); (y)[5] = (unsigned char)(((x)>>16)&255); \
69 (y)[6] = (unsigned char)(((x)>>8)&255); (y)[7] = (unsigned char)((x)&255); }
70
71#define LOAD64H(x, y) \
72 { x = (((uint64_t)((y)[0] & 255))<<56)|(((uint64_t)((y)[1] & 255))<<48) | \
73 (((uint64_t)((y)[2] & 255))<<40)|(((uint64_t)((y)[3] & 255))<<32) | \
74 (((uint64_t)((y)[4] & 255))<<24)|(((uint64_t)((y)[5] & 255))<<16) | \
75 (((uint64_t)((y)[6] & 255))<<8)|(((uint64_t)((y)[7] & 255))); }
76
77
78#define Ch(x,y,z) (z ^ (x & (y ^ z)))
79#define Maj(x,y,z) (((x | y) & z) | (x & y))
80#define S(x, n) ROR64c(x, n)
81#define R(x, n) (((x) &UINT64_C(0xFFFFFFFFFFFFFFFF))>>((uint64_t)n))
82#define Sigma0(x) (S(x, 28) ^ S(x, 34) ^ S(x, 39))
83#define Sigma1(x) (S(x, 14) ^ S(x, 18) ^ S(x, 41))
84#define Gamma0(x) (S(x, 1) ^ S(x, 8) ^ R(x, 7))
85#define Gamma1(x) (S(x, 19) ^ S(x, 61) ^ R(x, 6))
86#ifndef MIN
87 #define MIN(x, y) ( ((x)<(y))?(x):(y) )
88#endif
89
90/* compress 1024-bits */
91static int sha512_compress(sha512_context *md, unsigned char *buf)
92{
93 uint64_t S[8], W[80], t0, t1;
94 int i;
95
96 /* copy state into S */
97 for (i = 0; i < 8; i++) {
98 S[i] = md->state[i];
99 }
100
101 /* copy the state into 1024-bits into W[0..15] */
102 for (i = 0; i < 16; i++) {
103 LOAD64H(W[i], buf + (8*i));
104 }
105
106 /* fill W[16..79] */
107 for (i = 16; i < 80; i++) {
108 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
109 }
110
111/* Compress */
112 #define RND(a,b,c,d,e,f,g,h,i) \
113 t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
114 t1 = Sigma0(a) + Maj(a, b, c);\
115 d += t0; \
116 h = t0 + t1;
117
118 for (i = 0; i < 80; i += 8) {
119 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i+0);
120 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],i+1);
121 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],i+2);
122 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],i+3);
123 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],i+4);
124 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],i+5);
125 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],i+6);
126 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],i+7);
127 }
128
129 #undef RND
130
131
132
133 /* feedback */
134 for (i = 0; i < 8; i++) {
135 md->state[i] = md->state[i] + S[i];
136 }
137
138 return 0;
139}
140
141
142/**
143 Initialize the hash state
144 @param md The hash state you wish to initialize
145 @return 0 if successful
146*/
147int sha512_init(sha512_context * md) {
148 if (md == NULL) return 1;
149
150 md->curlen = 0;
151 md->length = 0;
152 md->state[0] = UINT64_C(0x6a09e667f3bcc908);
153 md->state[1] = UINT64_C(0xbb67ae8584caa73b);
154 md->state[2] = UINT64_C(0x3c6ef372fe94f82b);
155 md->state[3] = UINT64_C(0xa54ff53a5f1d36f1);
156 md->state[4] = UINT64_C(0x510e527fade682d1);
157 md->state[5] = UINT64_C(0x9b05688c2b3e6c1f);
158 md->state[6] = UINT64_C(0x1f83d9abfb41bd6b);
159 md->state[7] = UINT64_C(0x5be0cd19137e2179);
160
161 return 0;
162}
163
164/**
165 Process a block of memory though the hash
166 @param md The hash state
167 @param in The data to hash
168 @param inlen The length of the data (octets)
169 @return 0 if successful
170*/
171int sha512_update (sha512_context * md, const unsigned char *in, size_t inlen)
172{
173 size_t n;
174 size_t i;
175 int err;
176 if (md == NULL) return 1;
177 if (in == NULL) return 1;
178 if (md->curlen > sizeof(md->buf)) {
179 return 1;
180 }
181 while (inlen > 0) {
182 if (md->curlen == 0 && inlen >= 128) {
183 if ((err = sha512_compress (md, buf: (unsigned char *)in)) != 0) {
184 return err;
185 }
186 md->length += 128 * 8;
187 in += 128;
188 inlen -= 128;
189 } else {
190 n = MIN(inlen, (128 - md->curlen));
191
192 for (i = 0; i < n; i++) {
193 md->buf[i + md->curlen] = in[i];
194 }
195
196
197 md->curlen += n;
198 in += n;
199 inlen -= n;
200 if (md->curlen == 128) {
201 if ((err = sha512_compress (md, buf: md->buf)) != 0) {
202 return err;
203 }
204 md->length += 8*128;
205 md->curlen = 0;
206 }
207 }
208 }
209 return 0;
210}
211
212/**
213 Terminate the hash to get the digest
214 @param md The hash state
215 @param out [out] The destination of the hash (64 bytes)
216 @return 0 if successful
217*/
218 int sha512_final(sha512_context * md, unsigned char *out)
219 {
220 int i;
221
222 if (md == NULL) return 1;
223 if (out == NULL) return 1;
224
225 if (md->curlen >= sizeof(md->buf)) {
226 return 1;
227 }
228
229 /* increase the length of the message */
230 md->length += md->curlen * UINT64_C(8);
231
232 /* append the '1' bit */
233 md->buf[md->curlen++] = (unsigned char)0x80;
234
235 /* if the length is currently above 112 bytes we append zeros
236 * then compress. Then we can fall back to padding zeros and length
237 * encoding like normal.
238 */
239 if (md->curlen > 112) {
240 while (md->curlen < 128) {
241 md->buf[md->curlen++] = (unsigned char)0;
242 }
243 sha512_compress(md, buf: md->buf);
244 md->curlen = 0;
245 }
246
247 /* pad upto 120 bytes of zeroes
248 * note: that from 112 to 120 is the 64 MSB of the length. We assume that you won't hash
249 * > 2^64 bits of data... :-)
250 */
251while (md->curlen < 120) {
252 md->buf[md->curlen++] = (unsigned char)0;
253}
254
255 /* store length */
256STORE64H(md->length, md->buf+120);
257sha512_compress(md, buf: md->buf);
258
259 /* copy output */
260for (i = 0; i < 8; i++) {
261 STORE64H(md->state[i], out+(8*i));
262}
263
264return 0;
265}
266
267int sha512(const unsigned char *message, size_t message_len, unsigned char *out)
268{
269 sha512_context ctx;
270 int ret;
271 if ((ret = sha512_init(md: &ctx))) return ret;
272 if ((ret = sha512_update(md: &ctx, in: message, inlen: message_len))) return ret;
273 if ((ret = sha512_final(md: &ctx, out))) return ret;
274 return 0;
275}
276