/*
   BLAKE2 reference source code package - optimized C implementations
  
   Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
   terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
   your option.  The terms of these licenses can be found at:
  
   - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
   - OpenSSL license   : https://www.openssl.org/source/license.html
   - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
  
   More information about the BLAKE2 hash function can be found at
   https://blake2.net.
*/

#include <stdint.h>
#include <string.h>
#include <stdio.h>

#include "blake2.h"
#include "blake2-impl.h"

#include "blake2-config.h"

#ifdef _MSC_VER
#include <intrin.h> /* for _mm_set_epi64x */
#endif
#include <emmintrin.h>
#if defined(HAVE_SSSE3)
#include <tmmintrin.h>
#endif
#if defined(HAVE_SSE41)
#include <smmintrin.h>
#endif
#if defined(HAVE_AVX)
#include <immintrin.h>
#endif
#if defined(HAVE_XOP)
#include <x86intrin.h>
#endif

#include "blake2b-round.h"

static const uint64_t blake2b_IV[8] =
{
  0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
  0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
  0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
  0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
};

static const uint8_t blake2b_sigma[12][16] =
{
  {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
  { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 } ,
  { 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 } ,
  {  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 } ,
  {  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 } ,
  {  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 } ,
  { 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 } ,
  { 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 } ,
  {  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 } ,
  { 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0 } ,
  {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
  { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
};


/* Some helper functions, not necessarily useful */
BLAKE2_LOCAL_INLINE(int) blake2b_set_lastnode( blake2b_state *S )
{
  S->f[1] = -1;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_clear_lastnode( blake2b_state *S )
{
  S->f[1] = 0;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_is_lastblock( const blake2b_state *S )
{
  return S->f[0] != 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_set_lastblock( blake2b_state *S )
{
  if( S->last_node ) blake2b_set_lastnode( S );

  S->f[0] = -1;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_clear_lastblock( blake2b_state *S )
{
  if( S->last_node ) blake2b_clear_lastnode( S );

  S->f[0] = 0;
  return 0;
}


BLAKE2_LOCAL_INLINE(int) blake2b_increment_counter( blake2b_state *S, const uint64_t inc )
{
#if __x86_64__
  /* ADD/ADC chain */
  __uint128_t t = ( ( __uint128_t )S->t[1] << 64 ) | S->t[0];
  t += inc;
  S->t[0] = ( uint64_t )( t >>  0 );
  S->t[1] = ( uint64_t )( t >> 64 );
#else
  S->t[0] += inc;
  S->t[1] += ( S->t[0] < inc );
#endif
  return 0;
}


/* Parameter-related functions */
BLAKE2_LOCAL_INLINE(int) blake2b_param_set_digest_length( blake2b_param *P, const uint8_t digest_length )
{
  P->digest_length = digest_length;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_fanout( blake2b_param *P, const uint8_t fanout )
{
  P->fanout = fanout;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_max_depth( blake2b_param *P, const uint8_t depth )
{
  P->depth = depth;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_leaf_length( blake2b_param *P, const uint32_t leaf_length )
{
  P->leaf_length = leaf_length;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_node_offset( blake2b_param *P, const uint64_t node_offset )
{
  P->node_offset = node_offset;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_node_depth( blake2b_param *P, const uint8_t node_depth )
{
  P->node_depth = node_depth;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_inner_length( blake2b_param *P, const uint8_t inner_length )
{
  P->inner_length = inner_length;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_salt( blake2b_param *P, const uint8_t salt[BLAKE2B_SALTBYTES] )
{
  memcpy( P->salt, salt, BLAKE2B_SALTBYTES );
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_param_set_personal( blake2b_param *P, const uint8_t personal[BLAKE2B_PERSONALBYTES] )
{
  memcpy( P->personal, personal, BLAKE2B_PERSONALBYTES );
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_init0( blake2b_state *S )
{
  memset( S, 0, sizeof( blake2b_state ) );

  for( int i = 0; i < 8; ++i ) S->h[i] = blake2b_IV[i];

  return 0;
}

/* init xors IV with input parameter block */
int blake2b_init_param( blake2b_state *S, const blake2b_param *P )
{
  /*blake2b_init0( S ); */
  const uint8_t * v = ( const uint8_t * )( blake2b_IV );
  const uint8_t * p = ( const uint8_t * )( P );
  uint8_t * h = ( uint8_t * )( S->h );
  /* IV XOR ParamBlock */
  memset( S, 0, sizeof( blake2b_state ) );

  for( int i = 0; i < BLAKE2B_OUTBYTES; ++i ) h[i] = v[i] ^ p[i];

  return 0;
}


/* Some sort of default parameter block initialization, for sequential blake2b */
int blake2b_init( blake2b_state *S, const uint8_t outlen )
{
  const blake2b_param P =
  {
    outlen,
    0,
    1,
    1,
    0,
    0,
    0,
    0,
    {0},
    {0},
    {0}
  };

  if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1;

  return blake2b_init_param( S, &P );
}

int blake2b_init_key( blake2b_state *S, const uint8_t outlen, const void *key, const uint8_t keylen )
{
  const blake2b_param P =
  {
    outlen,
    keylen,
    1,
    1,
    0,
    0,
    0,
    0,
    {0},
    {0},
    {0}
  };

  if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1;

  if ( ( !keylen ) || keylen > BLAKE2B_KEYBYTES ) return -1;

  if( blake2b_init_param( S, &P ) < 0 )
    return 0;

  {
    uint8_t block[BLAKE2B_BLOCKBYTES];
    memset( block, 0, BLAKE2B_BLOCKBYTES );
    memcpy( block, key, keylen );
    blake2b_update( S, block, BLAKE2B_BLOCKBYTES );
    secure_zero_memory( block, BLAKE2B_BLOCKBYTES ); /* Burn the key from stack */
  }
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
{
  __m128i row1l, row1h;
  __m128i row2l, row2h;
  __m128i row3l, row3h;
  __m128i row4l, row4h;
  __m128i b0, b1;
  __m128i t0, t1;
#if defined(HAVE_SSSE3) && !defined(HAVE_XOP)
  const __m128i r16 = _mm_setr_epi8( 2, 3, 4, 5, 6, 7, 0, 1, 10, 11, 12, 13, 14, 15, 8, 9 );
  const __m128i r24 = _mm_setr_epi8( 3, 4, 5, 6, 7, 0, 1, 2, 11, 12, 13, 14, 15, 8, 9, 10 );
#endif
#if defined(HAVE_SSE41)
  const __m128i m0 = LOADU( block + 00 );
  const __m128i m1 = LOADU( block + 16 );
  const __m128i m2 = LOADU( block + 32 );
  const __m128i m3 = LOADU( block + 48 );
  const __m128i m4 = LOADU( block + 64 );
  const __m128i m5 = LOADU( block + 80 );
  const __m128i m6 = LOADU( block + 96 );
  const __m128i m7 = LOADU( block + 112 );
#else
  const uint64_t  m0 = ( ( uint64_t * )block )[ 0];
  const uint64_t  m1 = ( ( uint64_t * )block )[ 1];
  const uint64_t  m2 = ( ( uint64_t * )block )[ 2];
  const uint64_t  m3 = ( ( uint64_t * )block )[ 3];
  const uint64_t  m4 = ( ( uint64_t * )block )[ 4];
  const uint64_t  m5 = ( ( uint64_t * )block )[ 5];
  const uint64_t  m6 = ( ( uint64_t * )block )[ 6];
  const uint64_t  m7 = ( ( uint64_t * )block )[ 7];
  const uint64_t  m8 = ( ( uint64_t * )block )[ 8];
  const uint64_t  m9 = ( ( uint64_t * )block )[ 9];
  const uint64_t m10 = ( ( uint64_t * )block )[10];
  const uint64_t m11 = ( ( uint64_t * )block )[11];
  const uint64_t m12 = ( ( uint64_t * )block )[12];
  const uint64_t m13 = ( ( uint64_t * )block )[13];
  const uint64_t m14 = ( ( uint64_t * )block )[14];
  const uint64_t m15 = ( ( uint64_t * )block )[15];
#endif
  row1l = LOADU( &S->h[0] );
  row1h = LOADU( &S->h[2] );
  row2l = LOADU( &S->h[4] );
  row2h = LOADU( &S->h[6] );
  row3l = LOADU( &blake2b_IV[0] );
  row3h = LOADU( &blake2b_IV[2] );
  row4l = _mm_xor_si128( LOADU( &blake2b_IV[4] ), LOADU( &S->t[0] ) );
  row4h = _mm_xor_si128( LOADU( &blake2b_IV[6] ), LOADU( &S->f[0] ) );
  ROUND( 0 );
  ROUND( 1 );
  ROUND( 2 );
  ROUND( 3 );
  ROUND( 4 );
  ROUND( 5 );
  ROUND( 6 );
  ROUND( 7 );
  ROUND( 8 );
  ROUND( 9 );
  ROUND( 10 );
  ROUND( 11 );
  row1l = _mm_xor_si128( row3l, row1l );
  row1h = _mm_xor_si128( row3h, row1h );
  STOREU( &S->h[0], _mm_xor_si128( LOADU( &S->h[0] ), row1l ) );
  STOREU( &S->h[2], _mm_xor_si128( LOADU( &S->h[2] ), row1h ) );
  row2l = _mm_xor_si128( row4l, row2l );
  row2h = _mm_xor_si128( row4h, row2h );
  STOREU( &S->h[4], _mm_xor_si128( LOADU( &S->h[4] ), row2l ) );
  STOREU( &S->h[6], _mm_xor_si128( LOADU( &S->h[6] ), row2h ) );
  return 0;
}


int blake2b_update( blake2b_state *S, const uint8_t *in, uint64_t inlen )
{
  while( inlen > 0 )
  {
    size_t left = S->buflen;
    size_t fill = 2 * BLAKE2B_BLOCKBYTES - left;

    if( inlen > fill )
    {
      memcpy( S->buf + left, in, fill ); /* Fill buffer */
      S->buflen += fill;
      blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
      blake2b_compress( S, S->buf ); /* Compress */
      memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, BLAKE2B_BLOCKBYTES ); /* Shift buffer left */
      S->buflen -= BLAKE2B_BLOCKBYTES;
      in += fill;
      inlen -= fill;
    }
    else /* inlen <= fill */
    {
      memcpy( S->buf + left, in, inlen );
      S->buflen += inlen; /* Be lazy, do not compress */
      in += inlen;
      inlen -= inlen;
    }
  }

  return 0;
}


int blake2b_final( blake2b_state *S, uint8_t *out, uint8_t outlen )
{
  if( outlen > BLAKE2B_OUTBYTES )
    return -1;

  if( blake2b_is_lastblock( S ) )
    return -1;

  if( S->buflen > BLAKE2B_BLOCKBYTES )
  {
    blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
    blake2b_compress( S, S->buf );
    S->buflen -= BLAKE2B_BLOCKBYTES;
    memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, S->buflen );
  }

  blake2b_increment_counter( S, S->buflen );
  blake2b_set_lastblock( S );
  memset( S->buf + S->buflen, 0, 2 * BLAKE2B_BLOCKBYTES - S->buflen ); /* Padding */
  blake2b_compress( S, S->buf );
  memcpy( out, &S->h[0], outlen );
  return 0;
}


int blake2b( uint8_t *out, const void *in, const void *key, const uint8_t outlen, const uint64_t inlen, uint8_t keylen )
{
  blake2b_state S[1];

  /* Verify parameters */
  if ( NULL == in && inlen > 0 ) return -1;

  if ( NULL == out ) return -1;

  if( NULL == key && keylen > 0 ) return -1;

  if( !outlen || outlen > BLAKE2B_OUTBYTES ) return -1;

  if( keylen > BLAKE2B_KEYBYTES ) return -1;

  if( keylen )
  {
    if( blake2b_init_key( S, outlen, key, keylen ) < 0 ) return -1;
  }
  else
  {
    if( blake2b_init( S, outlen ) < 0 ) return -1;
  }

  blake2b_update( S, ( const uint8_t * )in, inlen );
  blake2b_final( S, out, outlen );
  return 0;
}

#if defined(SUPERCOP)
int crypto_hash( unsigned char *out, unsigned char *in, unsigned long long inlen )
{
  return blake2b( out, in, NULL, BLAKE2B_OUTBYTES, inlen, 0 );
}
#endif

#if defined(BLAKE2B_SELFTEST)
#include <string.h>
#include "blake2-kat.h"
int main( int argc, char **argv )
{
  uint8_t key[BLAKE2B_KEYBYTES];
  uint8_t buf[KAT_LENGTH];

  for( size_t i = 0; i < BLAKE2B_KEYBYTES; ++i )
    key[i] = ( uint8_t )i;

  for( size_t i = 0; i < KAT_LENGTH; ++i )
    buf[i] = ( uint8_t )i;

  for( size_t i = 0; i < KAT_LENGTH; ++i )
  {
    uint8_t hash[BLAKE2B_OUTBYTES];
    blake2b( hash, buf, key, BLAKE2B_OUTBYTES, i, BLAKE2B_KEYBYTES );

    if( 0 != memcmp( hash, blake2b_keyed_kat[i], BLAKE2B_OUTBYTES ) )
    {
      puts( "error" );
      return -1;
    }
  }

  puts( "ok" );
  return 0;
}
#endif

