LCOV - code coverage report
Current view: top level - plugins/wireguard/blake - blake2s.c (source / functions) Hit Total Coverage
Test: coverage-filtered.info Lines: 126 144 87.5 %
Date: 2023-07-05 22:20:52 Functions: 11 12 91.7 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2020 Doc.ai and/or its affiliates.
       3             :  * Copyright (c) 2012 Samuel Neves <sneves@dei.uc.pt>.
       4             :  * Licensed under the Apache License, Version 2.0 (the "License");
       5             :  * you may not use this file except in compliance with the License.
       6             :  * You may obtain a copy of the License at:
       7             :  *
       8             :  *     http://www.apache.org/licenses/LICENSE-2.0
       9             :  *
      10             :  * Unless required by applicable law or agreed to in writing, software
      11             :  * distributed under the License is distributed on an "AS IS" BASIS,
      12             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13             :  * See the License for the specific language governing permissions and
      14             :  * limitations under the License.
      15             :  */
      16             : /*
      17             :    More information about the BLAKE2 hash function can be found at
      18             :    https://blake2.net.
      19             : */
      20             : 
      21             : #include <stdint.h>
      22             : #include <string.h>
      23             : #include <stdio.h>
      24             : 
      25             : #include <wireguard/blake/blake2s.h>
      26             : #include "blake2-impl.h"
      27             : 
      28             : static const uint32_t blake2s_IV[8] = {
      29             :   0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
      30             :   0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL
      31             : };
      32             : 
      33             : static const uint8_t blake2s_sigma[10][16] = {
      34             :   {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
      35             :   {14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3},
      36             :   {11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4},
      37             :   {7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8},
      38             :   {9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13},
      39             :   {2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9},
      40             :   {12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11},
      41             :   {13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10},
      42             :   {6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5},
      43             :   {10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0},
      44             : };
      45             : 
      46             : static void
      47           0 : blake2s_set_lastnode (blake2s_state_t * S)
      48             : {
      49           0 :   S->f[1] = (uint32_t) - 1;
      50           0 : }
      51             : 
      52             : /* Some helper functions, not necessarily useful */
      53             : static int
      54        6890 : blake2s_is_lastblock (const blake2s_state_t * S)
      55             : {
      56        6890 :   return S->f[0] != 0;
      57             : }
      58             : 
      59             : static void
      60        6890 : blake2s_set_lastblock (blake2s_state_t * S)
      61             : {
      62        6890 :   if (S->last_node)
      63           0 :     blake2s_set_lastnode (S);
      64             : 
      65        6890 :   S->f[0] = (uint32_t) - 1;
      66        6890 : }
      67             : 
      68             : static void
      69       11044 : blake2s_increment_counter (blake2s_state_t * S, const uint32_t inc)
      70             : {
      71       11044 :   S->t[0] += inc;
      72       11044 :   S->t[1] += (S->t[0] < inc);
      73       11044 : }
      74             : 
      75             : static void
      76        6890 : blake2s_init0 (blake2s_state_t * S)
      77             : {
      78             :   size_t i;
      79        6890 :   memset (S, 0, sizeof (blake2s_state_t));
      80             : 
      81       62010 :   for (i = 0; i < 8; ++i)
      82       55120 :     S->h[i] = blake2s_IV[i];
      83        6890 : }
      84             : 
      85             : /* init2 xors IV with input parameter block */
      86             : int
      87        6890 : blake2s_init_param (blake2s_state_t * S, const blake2s_param_t * P)
      88             : {
      89        6890 :   const unsigned char *p = (const unsigned char *) (P);
      90             :   size_t i;
      91             : 
      92        6890 :   blake2s_init0 (S);
      93             : 
      94             :   /* IV XOR ParamBlock */
      95       62010 :   for (i = 0; i < 8; ++i)
      96       55120 :     S->h[i] ^= load32 (&p[i * 4]);
      97             : 
      98        6890 :   S->outlen = P->digest_length;
      99        6890 :   return 0;
     100             : }
     101             : 
     102             : 
     103             : /* Sequential blake2s initialization */
     104             : int
     105        5462 : blake2s_init (blake2s_state_t * S, size_t outlen)
     106             : {
     107             :   blake2s_param_t P[1];
     108             : 
     109             :   /* Move interval verification here? */
     110        5462 :   if ((!outlen) || (outlen > BLAKE2S_OUT_BYTES))
     111           0 :     return -1;
     112             : 
     113        5462 :   P->digest_length = (uint8_t) outlen;
     114        5462 :   P->key_length = 0;
     115        5462 :   P->fanout = 1;
     116        5462 :   P->depth = 1;
     117        5462 :   store32 (&P->leaf_length, 0);
     118        5462 :   store32 (&P->node_offset, 0);
     119        5462 :   store16 (&P->xof_length, 0);
     120        5462 :   P->node_depth = 0;
     121        5462 :   P->inner_length = 0;
     122             :   /* memset(P->reserved, 0, sizeof(P->reserved) ); */
     123        5462 :   memset (P->salt, 0, sizeof (P->salt));
     124        5462 :   memset (P->personal, 0, sizeof (P->personal));
     125        5462 :   return blake2s_init_param (S, P);
     126             : }
     127             : 
     128             : int
     129        1428 : blake2s_init_key (blake2s_state_t * S, size_t outlen, const void *key,
     130             :                   size_t keylen)
     131             : {
     132             :   blake2s_param_t P[1];
     133             : 
     134        1428 :   if ((!outlen) || (outlen > BLAKE2S_OUT_BYTES))
     135           0 :     return -1;
     136             : 
     137        1428 :   if (!key || !keylen || keylen > BLAKE2S_KEY_BYTES)
     138           0 :     return -1;
     139             : 
     140        1428 :   P->digest_length = (uint8_t) outlen;
     141        1428 :   P->key_length = (uint8_t) keylen;
     142        1428 :   P->fanout = 1;
     143        1428 :   P->depth = 1;
     144        1428 :   store32 (&P->leaf_length, 0);
     145        1428 :   store32 (&P->node_offset, 0);
     146        1428 :   store16 (&P->xof_length, 0);
     147        1428 :   P->node_depth = 0;
     148        1428 :   P->inner_length = 0;
     149             :   /* memset(P->reserved, 0, sizeof(P->reserved) ); */
     150        1428 :   memset (P->salt, 0, sizeof (P->salt));
     151        1428 :   memset (P->personal, 0, sizeof (P->personal));
     152             : 
     153        1428 :   if (blake2s_init_param (S, P) < 0)
     154           0 :     return -1;
     155             : 
     156             :   {
     157             :     uint8_t block[BLAKE2S_BLOCK_BYTES];
     158        1428 :     memset (block, 0, BLAKE2S_BLOCK_BYTES);
     159        1428 :     memcpy (block, key, keylen);
     160        1428 :     blake2s_update (S, block, BLAKE2S_BLOCK_BYTES);
     161        1428 :     secure_zero_memory (block, BLAKE2S_BLOCK_BYTES);    /* Burn the key from stack */
     162             :   }
     163        1428 :   return 0;
     164             : }
     165             : 
     166             : #define G(r,i,a,b,c,d)                      \
     167             :   do {                                      \
     168             :     a = a + b + m[blake2s_sigma[r][2*i+0]]; \
     169             :     d = rotr32(d ^ a, 16);                  \
     170             :     c = c + d;                              \
     171             :     b = rotr32(b ^ c, 12);                  \
     172             :     a = a + b + m[blake2s_sigma[r][2*i+1]]; \
     173             :     d = rotr32(d ^ a, 8);                   \
     174             :     c = c + d;                              \
     175             :     b = rotr32(b ^ c, 7);                   \
     176             :   } while(0)
     177             : 
     178             : #define ROUND(r)                    \
     179             :   do {                              \
     180             :     G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
     181             :     G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
     182             :     G(r,2,v[ 2],v[ 6],v[10],v[14]); \
     183             :     G(r,3,v[ 3],v[ 7],v[11],v[15]); \
     184             :     G(r,4,v[ 0],v[ 5],v[10],v[15]); \
     185             :     G(r,5,v[ 1],v[ 6],v[11],v[12]); \
     186             :     G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
     187             :     G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
     188             :   } while(0)
     189             : 
     190             : static void
     191       11044 : blake2s_compress (blake2s_state_t * S, const uint8_t in[BLAKE2S_BLOCK_BYTES])
     192             : {
     193             :   uint32_t m[16];
     194             :   uint32_t v[16];
     195             :   size_t i;
     196             : 
     197      187748 :   for (i = 0; i < 16; ++i)
     198             :     {
     199      176704 :       m[i] = load32 (in + i * sizeof (m[i]));
     200             :     }
     201             : 
     202       99396 :   for (i = 0; i < 8; ++i)
     203             :     {
     204       88352 :       v[i] = S->h[i];
     205             :     }
     206             : 
     207       11044 :   v[8] = blake2s_IV[0];
     208       11044 :   v[9] = blake2s_IV[1];
     209       11044 :   v[10] = blake2s_IV[2];
     210       11044 :   v[11] = blake2s_IV[3];
     211       11044 :   v[12] = S->t[0] ^ blake2s_IV[4];
     212       11044 :   v[13] = S->t[1] ^ blake2s_IV[5];
     213       11044 :   v[14] = S->f[0] ^ blake2s_IV[6];
     214       11044 :   v[15] = S->f[1] ^ blake2s_IV[7];
     215             : 
     216       11044 :   ROUND (0);
     217       11044 :   ROUND (1);
     218       11044 :   ROUND (2);
     219       11044 :   ROUND (3);
     220       11044 :   ROUND (4);
     221       11044 :   ROUND (5);
     222       11044 :   ROUND (6);
     223       11044 :   ROUND (7);
     224       11044 :   ROUND (8);
     225       11044 :   ROUND (9);
     226             : 
     227       99396 :   for (i = 0; i < 8; ++i)
     228             :     {
     229       88352 :       S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
     230             :     }
     231       11044 : }
     232             : 
     233             : #undef G
     234             : #undef ROUND
     235             : 
     236             : int
     237       13286 : blake2s_update (blake2s_state_t * S, const void *pin, size_t inlen)
     238             : {
     239       13286 :   const unsigned char *in = (const unsigned char *) pin;
     240       13286 :   if (inlen > 0)
     241             :     {
     242       13286 :       size_t left = S->buflen;
     243       13286 :       size_t fill = BLAKE2S_BLOCK_BYTES - left;
     244       13286 :       if (inlen > fill)
     245             :         {
     246        3138 :           S->buflen = 0;
     247        3138 :           memcpy (S->buf + left, in, fill);  /* Fill buffer */
     248        3138 :           blake2s_increment_counter (S, BLAKE2S_BLOCK_BYTES);
     249        3138 :           blake2s_compress (S, S->buf);      /* Compress */
     250        3138 :           in += fill;
     251        3138 :           inlen -= fill;
     252        4154 :           while (inlen > BLAKE2S_BLOCK_BYTES)
     253             :             {
     254        1016 :               blake2s_increment_counter (S, BLAKE2S_BLOCK_BYTES);
     255        1016 :               blake2s_compress (S, in);
     256        1016 :               in += BLAKE2S_BLOCK_BYTES;
     257        1016 :               inlen -= BLAKE2S_BLOCK_BYTES;
     258             :             }
     259             :         }
     260       13286 :       memcpy (S->buf + S->buflen, in, inlen);
     261       13286 :       S->buflen += inlen;
     262             :     }
     263       13286 :   return 0;
     264             : }
     265             : 
     266             : int
     267        6890 : blake2s_final (blake2s_state_t * S, void *out, size_t outlen)
     268             : {
     269        6890 :   uint8_t buffer[BLAKE2S_OUT_BYTES] = { 0 };
     270             :   size_t i;
     271             : 
     272        6890 :   if (out == NULL || outlen < S->outlen)
     273           0 :     return -1;
     274             : 
     275        6890 :   if (blake2s_is_lastblock (S))
     276           0 :     return -1;
     277             : 
     278        6890 :   blake2s_increment_counter (S, (uint32_t) S->buflen);
     279        6890 :   blake2s_set_lastblock (S);
     280        6890 :   memset (S->buf + S->buflen, 0, BLAKE2S_BLOCK_BYTES - S->buflen);     /* Padding */
     281        6890 :   blake2s_compress (S, S->buf);
     282             : 
     283       62010 :   for (i = 0; i < 8; ++i)    /* Output full hash to temp buffer */
     284       55120 :     store32 (buffer + sizeof (S->h[i]) * i, S->h[i]);
     285             : 
     286        6890 :   memcpy (out, buffer, outlen);
     287        6890 :   secure_zero_memory (buffer, sizeof (buffer));
     288        6890 :   return 0;
     289             : }
     290             : 
     291             : int
     292         790 : blake2s (void *out, size_t outlen, const void *in, size_t inlen,
     293             :          const void *key, size_t keylen)
     294             : {
     295             :   blake2s_state_t S[1];
     296             : 
     297             :   /* Verify parameters */
     298         790 :   if (NULL == in && inlen > 0)
     299           0 :     return -1;
     300             : 
     301         790 :   if (NULL == out)
     302           0 :     return -1;
     303             : 
     304         790 :   if (NULL == key && keylen > 0)
     305           0 :     return -1;
     306             : 
     307         790 :   if (!outlen || outlen > BLAKE2S_OUT_BYTES)
     308           0 :     return -1;
     309             : 
     310         790 :   if (keylen > BLAKE2S_KEY_BYTES)
     311           0 :     return -1;
     312             : 
     313         790 :   if (keylen > 0)
     314             :     {
     315           0 :       if (blake2s_init_key (S, outlen, key, keylen) < 0)
     316           0 :         return -1;
     317             :     }
     318             :   else
     319             :     {
     320         790 :       if (blake2s_init (S, outlen) < 0)
     321           0 :         return -1;
     322             :     }
     323             : 
     324         790 :   blake2s_update (S, (const uint8_t *) in, inlen);
     325         790 :   blake2s_final (S, out, outlen);
     326         790 :   return 0;
     327             : }
     328             : 
     329             : /*
     330             :  * fd.io coding-style-patch-verification: ON
     331             :  *
     332             :  * Local Variables:
     333             :  * eval: (c-set-style "gnu")
     334             :  * End:
     335             :  */

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