crypto/blake2/blake2s.c

   1 /*
   2  * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.
   3  * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
   4  *
   5  * Licensed under the OpenSSL licenses, (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  * https://www.openssl.org/source/license.html
   9  * or in the file LICENSE in the source distribution.
  10  */
  11
  12 /*
  13  * Derived from the BLAKE2 reference implementation written by Samuel Neves.
  14  * More information about the BLAKE2 hash function and its implementations
  15  * can be found at https://blake2.net.
  16  */
  17
  18 #include <string.h>
  19 #include <openssl/crypto.h>
  20 #include "e_os.h"
  21
  22 #include "blake2_locl.h"
  23 #include "blake2_impl.h"
  24
  25 static const uint32_t blake2s_IV[8] =
  26 {
  27     0x6A09E667U, 0xBB67AE85U, 0x3C6EF372U, 0xA54FF53AU,
  28     0x510E527FU, 0x9B05688CU, 0x1F83D9ABU, 0x5BE0CD19U
  29 };
  30
  31 static const uint8_t blake2s_sigma[10][16] =
  32 {
  33     {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
  34     { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 } ,
  35     { 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 } ,
  36     {  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 } ,
  37     {  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 } ,
  38     {  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 } ,
  39     { 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 } ,
  40     { 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 } ,
  41     {  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 } ,
  42     { 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0 } ,
  43 };
  44
  45 /* Set that it's the last block we'll compress */
  46 static ossl_inline void blake2s_set_lastblock(BLAKE2S_CTX *S)
  47 {
  48     S->f[0] = -1;
  49 }
  50
  51 /* Increment the data hashed counter. */
  52 static ossl_inline void blake2s_increment_counter(BLAKE2S_CTX *S,
  53                                                   const uint32_t inc)
  54 {
  55     S->t[0] += inc;
  56     S->t[1] += (S->t[0] < inc);
  57 }
  58
  59 /* Initialize the hashing state. */
  60 static ossl_inline void blake2s_init0(BLAKE2S_CTX *S)
  61 {
  62     int i;
  63
  64     memset(S, 0, sizeof(BLAKE2S_CTX));
  65     for(i = 0; i < 8; ++i) {
  66         S->h[i] = blake2s_IV[i];
  67     }
  68 }
  69
  70 /* init2 xors IV with input parameter block */
  71 static void blake2s_init_param(BLAKE2S_CTX *S, const BLAKE2S_PARAM *P)
  72 {
  73     const uint8_t *p = (const uint8_t *)(P);
  74     size_t i;
  75
  76     /* The param struct is carefully hand packed, and should be 32 bytes on
  77      * every platform. */
  78     OPENSSL_assert(sizeof(BLAKE2S_PARAM) == 32);
  79     blake2s_init0(S);
  80     /* IV XOR ParamBlock */
  81     for(i = 0; i < 8; ++i) {
  82         S->h[i] ^= load32(&p[i*4]);
  83     }
  84 }
  85
  86 /* Initialize the hashing context.  Always returns 1. */
  87 int BLAKE2s_Init(BLAKE2S_CTX *c)
  88 {
  89     BLAKE2S_PARAM P[1];
  90
  91     P->digest_length = BLAKE2S_DIGEST_LENGTH;
  92     P->key_length    = 0;
  93     P->fanout        = 1;
  94     P->depth         = 1;
  95     store32(P->leaf_length, 0);
  96     store48(P->node_offset, 0);
  97     P->node_depth    = 0;
  98     P->inner_length  = 0;
  99     memset(P->salt,     0, sizeof(P->salt));
 100     memset(P->personal, 0, sizeof(P->personal));
 101     blake2s_init_param(c, P);
 102     return 1;
 103 }
 104
 105 /* Permute the state while xoring in the block of data. */
 106 static void blake2s_compress(BLAKE2S_CTX *S,
 107                             const uint8_t block[BLAKE2S_BLOCKBYTES])
 108 {
 109     uint32_t m[16];
 110     uint32_t v[16];
 111     size_t i;
 112
 113     for(i = 0; i < 16; ++i) {
 114         m[i] = load32(block + i * sizeof(m[i]));
 115     }
 116
 117     for(i = 0; i < 8; ++i) {
 118         v[i] = S->h[i];
 119     }
 120
 121     v[ 8] = blake2s_IV[0];
 122     v[ 9] = blake2s_IV[1];
 123     v[10] = blake2s_IV[2];
 124     v[11] = blake2s_IV[3];
 125     v[12] = S->t[0] ^ blake2s_IV[4];
 126     v[13] = S->t[1] ^ blake2s_IV[5];
 127     v[14] = S->f[0] ^ blake2s_IV[6];
 128     v[15] = S->f[1] ^ blake2s_IV[7];
 129 #define G(r,i,a,b,c,d) \
 130     do { \
 131         a = a + b + m[blake2s_sigma[r][2*i+0]]; \
 132         d = rotr32(d ^ a, 16); \
 133         c = c + d; \
 134         b = rotr32(b ^ c, 12); \
 135         a = a + b + m[blake2s_sigma[r][2*i+1]]; \
 136         d = rotr32(d ^ a, 8); \
 137         c = c + d; \
 138         b = rotr32(b ^ c, 7); \
 139     } while(0)
 140 #define ROUND(r)  \
 141     do { \
 142         G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
 143         G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
 144         G(r,2,v[ 2],v[ 6],v[10],v[14]); \
 145         G(r,3,v[ 3],v[ 7],v[11],v[15]); \
 146         G(r,4,v[ 0],v[ 5],v[10],v[15]); \
 147         G(r,5,v[ 1],v[ 6],v[11],v[12]); \
 148         G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
 149         G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
 150     } while(0)
 151     ROUND(0);
 152     ROUND(1);
 153     ROUND(2);
 154     ROUND(3);
 155     ROUND(4);
 156     ROUND(5);
 157     ROUND(6);
 158     ROUND(7);
 159     ROUND(8);
 160     ROUND(9);
 161
 162     for(i = 0; i < 8; ++i) {
 163         S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
 164     }
 165
 166 #undef G
 167 #undef ROUND
 168 }
 169
 170 /* Absorb the input data into the hash state.  Always returns 1. */
 171 int BLAKE2s_Update(BLAKE2S_CTX *c, const void *data, size_t datalen)
 172 {
 173     const uint8_t *in = data;
 174     size_t fill;
 175
 176     while(datalen > 0) {
 177         fill = sizeof(c->buf) - c->buflen;
 178         /* Must be >, not >=, so that last block can be hashed differently */
 179         if(datalen > fill) {
 180             memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
 181             blake2s_increment_counter(c, BLAKE2S_BLOCKBYTES);
 182             blake2s_compress(c, c->buf); /* Compress */
 183             c->buflen = 0;
 184             in += fill;
 185             datalen -= fill;
 186         } else { /* datalen <= fill */
 187             memcpy(c->buf + c->buflen, in, datalen);
 188             c->buflen += datalen; /* Be lazy, do not compress */
 189             return 1;
 190         }
 191     }
 192
 193     return 1;
 194 }
 195
 196 /*
 197  * Calculate the final hash and save it in md.
 198  * Always returns 1.
 199  */
 200 int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c)
 201 {
 202     int i;
 203
 204     blake2s_increment_counter(c, (uint32_t)c->buflen);
 205     blake2s_set_lastblock(c);
 206     /* Padding */
 207     memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
 208     blake2s_compress(c, c->buf);
 209
 210     /* Output full hash to temp buffer */
 211     for(i = 0; i < 8; ++i) {
 212         store32(md + sizeof(c->h[i]) * i, c->h[i]);
 213     }
 214
 215     OPENSSL_cleanse(c, sizeof(BLAKE2S_CTX));
 216     return 1;
 217 }