1/*
2   BLAKE2 reference source code package - reference C implementations
3
4   Written in 2012 by Samuel Neves <sneves@dei.uc.pt>
5
6   To the extent possible under law, the author(s) have dedicated all copyright
7   and related and neighboring rights to this software to the public domain
8   worldwide. This software is distributed without any warranty.
9
10   You should have received a copy of the CC0 Public Domain Dedication along with
11   this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
12*/
13
14#include <stdint.h>
15#include <string.h>
16#include <stdio.h>
17
18#include "blake2.h"
19#include "blake2-impl.h"
20
21static const uint64_t blake2b_IV[8] =
22{
23  0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
24  0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
25  0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
26  0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
27};
28
29static const uint8_t blake2b_sigma[12][16] =
30{
31  {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
32  { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 } ,
33  { 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 } ,
34  {  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 } ,
35  {  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 } ,
36  {  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 } ,
37  { 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 } ,
38  { 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 } ,
39  {  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 } ,
40  { 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0 } ,
41  {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
42  { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
43};
44
45
46static inline int blake2b_set_lastnode( blake2b_state *S )
47{
48  S->f[1] = ~0ULL;
49  return 0;
50}
51
52static inline int blake2b_clear_lastnode( blake2b_state *S )
53{
54  S->f[1] = 0ULL;
55  return 0;
56}
57
58/* Some helper functions, not necessarily useful */
59static inline int blake2b_set_lastblock( blake2b_state *S )
60{
61  if( S->last_node ) blake2b_set_lastnode( S );
62
63  S->f[0] = ~0ULL;
64  return 0;
65}
66
67static inline int blake2b_clear_lastblock( blake2b_state *S )
68{
69  if( S->last_node ) blake2b_clear_lastnode( S );
70
71  S->f[0] = 0ULL;
72  return 0;
73}
74
75static inline int blake2b_increment_counter( blake2b_state *S, const uint64_t inc )
76{
77  S->t[0] += inc;
78  S->t[1] += ( S->t[0] < inc );
79  return 0;
80}
81
82
83
84// Parameter-related functions
85static inline int blake2b_param_set_digest_length( blake2b_param *P, const uint8_t digest_length )
86{
87  P->digest_length = digest_length;
88  return 0;
89}
90
91static inline int blake2b_param_set_fanout( blake2b_param *P, const uint8_t fanout )
92{
93  P->fanout = fanout;
94  return 0;
95}
96
97static inline int blake2b_param_set_max_depth( blake2b_param *P, const uint8_t depth )
98{
99  P->depth = depth;
100  return 0;
101}
102
103static inline int blake2b_param_set_leaf_length( blake2b_param *P, const uint32_t leaf_length )
104{
105  store32( &P->leaf_length, leaf_length );
106  return 0;
107}
108
109static inline int blake2b_param_set_node_offset( blake2b_param *P, const uint64_t node_offset )
110{
111  store64( &P->node_offset, node_offset );
112  return 0;
113}
114
115static inline int blake2b_param_set_node_depth( blake2b_param *P, const uint8_t node_depth )
116{
117  P->node_depth = node_depth;
118  return 0;
119}
120
121static inline int blake2b_param_set_inner_length( blake2b_param *P, const uint8_t inner_length )
122{
123  P->inner_length = inner_length;
124  return 0;
125}
126
127static inline int blake2b_param_set_salt( blake2b_param *P, const uint8_t salt[BLAKE2B_SALTBYTES] )
128{
129  memcpy( P->salt, salt, BLAKE2B_SALTBYTES );
130  return 0;
131}
132
133static inline int blake2b_param_set_personal( blake2b_param *P, const uint8_t personal[BLAKE2B_PERSONALBYTES] )
134{
135  memcpy( P->personal, personal, BLAKE2B_PERSONALBYTES );
136  return 0;
137}
138
139static inline int blake2b_init0( blake2b_state *S )
140{
141  memset( S, 0, sizeof( blake2b_state ) );
142
143  for( int i = 0; i < 8; ++i ) S->h[i] = blake2b_IV[i];
144
145  return 0;
146}
147
148#if defined(__cplusplus)
149extern "C" {
150#endif
151  int blake2b_init( blake2b_state *S, size_t outlen );
152  int blake2b_init_param( blake2b_state *S, const blake2b_param *P );
153  int blake2b_init_key( blake2b_state *S, size_t outlen, const void *key, size_t keylen );
154  int blake2b_update( blake2b_state *S, const uint8_t *in, size_t inlen );
155  int blake2b_final( blake2b_state *S, uint8_t *out, size_t outlen );
156  int blake2b( uint8_t *out, const void *in, const void *key, size_t outlen, size_t inlen, size_t keylen );
157#if defined(__cplusplus)
158}
159#endif
160
161/* init xors IV with input parameter block */
162int blake2b_init_param( blake2b_state *S, const blake2b_param *P )
163{
164  blake2b_init0( S );
165  uint8_t *p = ( uint8_t * )( P );
166
167  /* IV XOR ParamBlock */
168  for( size_t i = 0; i < 8; ++i )
169    S->h[i] ^= load64( p + sizeof( S->h[i] ) * i );
170
171  S->outlen = P->digest_length;
172  return 0;
173}
174
175
176
177int blake2b_init( blake2b_state *S, size_t outlen )
178{
179  blake2b_param P[1];
180
181  if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1;
182
183  P->digest_length = ( uint8_t ) outlen;
184  P->key_length    = 0;
185  P->fanout        = 1;
186  P->depth         = 1;
187  store32( &P->leaf_length, 0 );
188  store64( &P->node_offset, 0 );
189  P->node_depth    = 0;
190  P->inner_length  = 0;
191  memset( P->reserved, 0, sizeof( P->reserved ) );
192  memset( P->salt,     0, sizeof( P->salt ) );
193  memset( P->personal, 0, sizeof( P->personal ) );
194  return blake2b_init_param( S, P );
195}
196
197
198int blake2b_init_key( blake2b_state *S, size_t outlen, const void *key, size_t keylen )
199{
200  blake2b_param P[1];
201
202  if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1;
203
204  if ( !key || !keylen || keylen > BLAKE2B_KEYBYTES ) return -1;
205
206  P->digest_length = ( uint8_t ) outlen;
207  P->key_length    = ( uint8_t ) keylen;
208  P->fanout        = 1;
209  P->depth         = 1;
210  store32( &P->leaf_length, 0 );
211  store64( &P->node_offset, 0 );
212  P->node_depth    = 0;
213  P->inner_length  = 0;
214  memset( P->reserved, 0, sizeof( P->reserved ) );
215  memset( P->salt,     0, sizeof( P->salt ) );
216  memset( P->personal, 0, sizeof( P->personal ) );
217
218  if( blake2b_init_param( S, P ) < 0 ) return -1;
219
220  {
221    uint8_t block[BLAKE2B_BLOCKBYTES];
222    memset( block, 0, BLAKE2B_BLOCKBYTES );
223    memcpy( block, key, keylen );
224    blake2b_update( S, block, BLAKE2B_BLOCKBYTES );
225    secure_zero_memory( block, BLAKE2B_BLOCKBYTES ); /* Burn the key from stack */
226  }
227  return 0;
228}
229
230static int blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
231{
232  uint64_t m[16];
233  uint64_t v[16];
234  size_t i;
235
236  for( i = 0; i < 16; ++i )
237    m[i] = load64( block + i * sizeof( m[i] ) );
238
239  for( i = 0; i < 8; ++i )
240    v[i] = S->h[i];
241
242  v[ 8] = blake2b_IV[0];
243  v[ 9] = blake2b_IV[1];
244  v[10] = blake2b_IV[2];
245  v[11] = blake2b_IV[3];
246  v[12] = S->t[0] ^ blake2b_IV[4];
247  v[13] = S->t[1] ^ blake2b_IV[5];
248  v[14] = S->f[0] ^ blake2b_IV[6];
249  v[15] = S->f[1] ^ blake2b_IV[7];
250#define G(r,i,a,b,c,d) \
251  do { \
252    a = a + b + m[blake2b_sigma[r][2*i+0]]; \
253    d = rotr64(d ^ a, 32); \
254    c = c + d; \
255    b = rotr64(b ^ c, 24); \
256    a = a + b + m[blake2b_sigma[r][2*i+1]]; \
257    d = rotr64(d ^ a, 16); \
258    c = c + d; \
259    b = rotr64(b ^ c, 63); \
260  } while(0)
261#define ROUND(r)  \
262  do { \
263    G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
264    G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
265    G(r,2,v[ 2],v[ 6],v[10],v[14]); \
266    G(r,3,v[ 3],v[ 7],v[11],v[15]); \
267    G(r,4,v[ 0],v[ 5],v[10],v[15]); \
268    G(r,5,v[ 1],v[ 6],v[11],v[12]); \
269    G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
270    G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
271  } while(0)
272  ROUND( 0 );
273  ROUND( 1 );
274  ROUND( 2 );
275  ROUND( 3 );
276  ROUND( 4 );
277  ROUND( 5 );
278  ROUND( 6 );
279  ROUND( 7 );
280  ROUND( 8 );
281  ROUND( 9 );
282  ROUND( 10 );
283  ROUND( 11 );
284
285  for( i = 0; i < 8; ++i )
286    S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
287
288#undef G
289#undef ROUND
290  return 0;
291}
292
293
294int blake2b_update( blake2b_state *S, const uint8_t *in, size_t inlen )
295{
296  while( inlen > 0 )
297  {
298    uint32_t left = S->buflen;
299    uint32_t fill = 2 * BLAKE2B_BLOCKBYTES - left;
300
301    if( inlen > fill )
302    {
303      memcpy( S->buf + left, in, fill ); // Fill buffer
304      S->buflen += fill;
305      blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
306      blake2b_compress( S, S->buf ); // Compress
307      memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, BLAKE2B_BLOCKBYTES ); // Shift buffer left
308      S->buflen -= BLAKE2B_BLOCKBYTES;
309      in += fill;
310      inlen -= fill;
311    }
312    else // inlen <= fill
313    {
314      memcpy( S->buf + left, in, inlen );
315      S->buflen += ( uint32_t ) inlen; // Be lazy, do not compress
316      in += inlen;
317      inlen -= inlen;
318    }
319  }
320
321  return 0;
322}
323
324int blake2b_final( blake2b_state *S, uint8_t *out, size_t outlen )
325{
326  uint8_t buffer[BLAKE2B_OUTBYTES];
327  size_t i;
328
329  if(S->outlen != outlen) return -1;
330
331  if( S->buflen > BLAKE2B_BLOCKBYTES )
332  {
333    blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
334    blake2b_compress( S, S->buf );
335    S->buflen -= BLAKE2B_BLOCKBYTES;
336    memmove( S->buf, S->buf + BLAKE2B_BLOCKBYTES, S->buflen );
337  }
338
339  blake2b_increment_counter( S, S->buflen );
340  blake2b_set_lastblock( S );
341  memset( S->buf + S->buflen, 0, 2 * BLAKE2B_BLOCKBYTES - S->buflen ); /* Padding */
342  blake2b_compress( S, S->buf );
343
344  for( i = 0; i < 8; ++i ) /* Output full hash to temp buffer */
345    store64( buffer + sizeof( S->h[i] ) * i, S->h[i] );
346
347  memcpy( out, buffer, outlen );
348  return 0;
349}
350
351int blake2b( uint8_t *out, const void *in, const void *key, size_t outlen, size_t inlen, size_t keylen )
352{
353  blake2b_state S[1];
354
355  /* Verify parameters */
356  if ( NULL == in && inlen > 0 ) return -1;
357
358  if ( NULL == out ) return -1;
359
360  if( NULL == key && keylen > 0 ) return -1;
361
362  if( !outlen || outlen > BLAKE2B_OUTBYTES ) return -1;
363
364  if( keylen > BLAKE2B_KEYBYTES ) return -1;
365
366  if( keylen > 0 )
367  {
368    if( blake2b_init_key( S, outlen, key, keylen ) < 0 ) return -1;
369  }
370  else
371  {
372    if( blake2b_init( S, outlen ) < 0 ) return -1;
373  }
374
375  if( blake2b_update( S, ( uint8_t * )in, inlen ) < 0 ) return -1;
376  return blake2b_final( S, out, outlen );
377}
378
379
380