/*
   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"


#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 "blake2s-round.h"

static const uint32_t blake2s_IV[8] =
{
  0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
  0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL
};

static const uint8_t blake2s_sigma[10][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 } ,
};


/* Some helper functions, not necessarily useful */
BLAKE2_LOCAL_INLINE(int) blake2s_set_lastnode( blake2s_state *S )
{
  S->f[1] = -1;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_clear_lastnode( blake2s_state *S )
{
  S->f[1] = 0;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_is_lastblock( const blake2s_state *S )
{
  return S->f[0] != 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_set_lastblock( blake2s_state *S )
{
  if( S->last_node ) blake2s_set_lastnode( S );

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

BLAKE2_LOCAL_INLINE(int) blake2s_clear_lastblock( blake2s_state *S )
{
  if( S->last_node ) blake2s_clear_lastnode( S );

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

BLAKE2_LOCAL_INLINE(int) blake2s_increment_counter( blake2s_state *S, const uint32_t inc )
{
  uint64_t t = ( ( uint64_t )S->t[1] << 32 ) | S->t[0];
  t += inc;
  S->t[0] = ( uint32_t )( t >>  0 );
  S->t[1] = ( uint32_t )( t >> 32 );
  return 0;
}


/* Parameter-related functions */
BLAKE2_LOCAL_INLINE(int) blake2s_param_set_digest_length( blake2s_param *P, const uint8_t digest_length )
{
  P->digest_length = digest_length;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_fanout( blake2s_param *P, const uint8_t fanout )
{
  P->fanout = fanout;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_max_depth( blake2s_param *P, const uint8_t depth )
{
  P->depth = depth;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_leaf_length( blake2s_param *P, const uint32_t leaf_length )
{
  P->leaf_length = leaf_length;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_node_offset( blake2s_param *P, const uint64_t node_offset )
{
  store48( P->node_offset, node_offset );
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_node_depth( blake2s_param *P, const uint8_t node_depth )
{
  P->node_depth = node_depth;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_inner_length( blake2s_param *P, const uint8_t inner_length )
{
  P->inner_length = inner_length;
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_salt( blake2s_param *P, const uint8_t salt[BLAKE2S_SALTBYTES] )
{
  memcpy( P->salt, salt, BLAKE2S_SALTBYTES );
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_param_set_personal( blake2s_param *P, const uint8_t personal[BLAKE2S_PERSONALBYTES] )
{
  memcpy( P->personal, personal, BLAKE2S_PERSONALBYTES );
  return 0;
}

BLAKE2_LOCAL_INLINE(int) blake2s_init0( blake2s_state *S )
{
  memset( S, 0, sizeof( blake2s_state ) );

  for( int i = 0; i < 8; ++i ) S->h[i] = blake2s_IV[i];

  return 0;
}

/* init2 xors IV with input parameter block */
int blake2s_init_param( blake2s_state *S, const blake2s_param *P )
{
  /*blake2s_init0( S ); */
  const uint8_t * v = ( const uint8_t * )( blake2s_IV );
  const uint8_t * p = ( const uint8_t * )( P );
  uint8_t * h = ( uint8_t * )( S->h );
  /* IV XOR ParamBlock */
  memset( S, 0, sizeof( blake2s_state ) );

  for( int i = 0; i < BLAKE2S_OUTBYTES; ++i ) h[i] = v[i] ^ p[i];

  return 0;
}


/* Some sort of default parameter block initialization, for sequential blake2s */
int blake2s_init( blake2s_state *S, const uint8_t outlen )
{
  const blake2s_param P =
  {
    outlen,
    0,
    1,
    1,
    0,
    {0},
    0,
    0,
    {0},
    {0}
  };
  /* Move interval verification here? */
  if ( ( !outlen ) || ( outlen > BLAKE2S_OUTBYTES ) ) return -1;
  return blake2s_init_param( S, &P );
}


int blake2s_init_key( blake2s_state *S, const uint8_t outlen, const void *key, const uint8_t keylen )
{
  const blake2s_param P =
  {
    outlen,
    keylen,
    1,
    1,
    0,
    {0},
    0,
    0,
    {0},
    {0}
  };

  /* Move interval verification here? */
  if ( ( !outlen ) || ( outlen > BLAKE2S_OUTBYTES ) ) return -1;

  if ( ( !key ) || ( !keylen ) || keylen > BLAKE2S_KEYBYTES ) return -1;

  if( blake2s_init_param( S, &P ) < 0 )
    return -1;

  {
    uint8_t block[BLAKE2S_BLOCKBYTES];
    memset( block, 0, BLAKE2S_BLOCKBYTES );
    memcpy( block, key, keylen );
    blake2s_update( S, block, BLAKE2S_BLOCKBYTES );
    secure_zero_memory( block, BLAKE2S_BLOCKBYTES ); /* Burn the key from stack */
  }
  return 0;
}


BLAKE2_LOCAL_INLINE(int) blake2s_compress( blake2s_state *S, const uint8_t block[BLAKE2S_BLOCKBYTES] )
{
  __m128i row1, row2, row3, row4;
  __m128i buf1, buf2, buf3, buf4;
#if defined(HAVE_SSE41)
  __m128i t0, t1;
#if !defined(HAVE_XOP)
  __m128i t2;
#endif
#endif
  __m128i ff0, ff1;
#if defined(HAVE_SSSE3) && !defined(HAVE_XOP)
  const __m128i r8 = _mm_set_epi8( 12, 15, 14, 13, 8, 11, 10, 9, 4, 7, 6, 5, 0, 3, 2, 1 );
  const __m128i r16 = _mm_set_epi8( 13, 12, 15, 14, 9, 8, 11, 10, 5, 4, 7, 6, 1, 0, 3, 2 );
#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 );
#else
  const uint32_t  m0 = ( ( uint32_t * )block )[ 0];
  const uint32_t  m1 = ( ( uint32_t * )block )[ 1];
  const uint32_t  m2 = ( ( uint32_t * )block )[ 2];
  const uint32_t  m3 = ( ( uint32_t * )block )[ 3];
  const uint32_t  m4 = ( ( uint32_t * )block )[ 4];
  const uint32_t  m5 = ( ( uint32_t * )block )[ 5];
  const uint32_t  m6 = ( ( uint32_t * )block )[ 6];
  const uint32_t  m7 = ( ( uint32_t * )block )[ 7];
  const uint32_t  m8 = ( ( uint32_t * )block )[ 8];
  const uint32_t  m9 = ( ( uint32_t * )block )[ 9];
  const uint32_t m10 = ( ( uint32_t * )block )[10];
  const uint32_t m11 = ( ( uint32_t * )block )[11];
  const uint32_t m12 = ( ( uint32_t * )block )[12];
  const uint32_t m13 = ( ( uint32_t * )block )[13];
  const uint32_t m14 = ( ( uint32_t * )block )[14];
  const uint32_t m15 = ( ( uint32_t * )block )[15];
#endif
  row1 = ff0 = LOADU( &S->h[0] );
  row2 = ff1 = LOADU( &S->h[4] );
  row3 = _mm_setr_epi32( 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A );
  row4 = _mm_xor_si128( _mm_setr_epi32( 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 ), LOADU( &S->t[0] ) );
  ROUND( 0 );
  ROUND( 1 );
  ROUND( 2 );
  ROUND( 3 );
  ROUND( 4 );
  ROUND( 5 );
  ROUND( 6 );
  ROUND( 7 );
  ROUND( 8 );
  ROUND( 9 );
  STOREU( &S->h[0], _mm_xor_si128( ff0, _mm_xor_si128( row1, row3 ) ) );
  STOREU( &S->h[4], _mm_xor_si128( ff1, _mm_xor_si128( row2, row4 ) ) );
  return 0;
}

/* inlen now in bytes */
int blake2s_update( blake2s_state *S, const uint8_t *in, uint64_t inlen )
{
  while( inlen > 0 )
  {
    size_t left = S->buflen;
    size_t fill = 2 * BLAKE2S_BLOCKBYTES - left;

    if( inlen > fill )
    {
      memcpy( S->buf + left, in, fill ); /* Fill buffer */
      S->buflen += fill;
      blake2s_increment_counter( S, BLAKE2S_BLOCKBYTES );
      blake2s_compress( S, S->buf ); /* Compress */
      memcpy( S->buf, S->buf + BLAKE2S_BLOCKBYTES, BLAKE2S_BLOCKBYTES ); /* Shift buffer left */
      S->buflen -= BLAKE2S_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;
}

/* Is this correct? */
int blake2s_final( blake2s_state *S, uint8_t *out, uint8_t outlen )
{
  uint8_t buffer[BLAKE2S_OUTBYTES] = {0};

  if( outlen > BLAKE2S_OUTBYTES )
    return -1;

  if( blake2s_is_lastblock( S ) )
    return -1;

  if( S->buflen > BLAKE2S_BLOCKBYTES )
  {
    blake2s_increment_counter( S, BLAKE2S_BLOCKBYTES );
    blake2s_compress( S, S->buf );
    S->buflen -= BLAKE2S_BLOCKBYTES;
    memcpy( S->buf, S->buf + BLAKE2S_BLOCKBYTES, S->buflen );
  }

  blake2s_increment_counter( S, ( uint32_t )S->buflen );
  blake2s_set_lastblock( S );
  memset( S->buf + S->buflen, 0, 2 * BLAKE2S_BLOCKBYTES - S->buflen ); /* Padding */
  blake2s_compress( S, S->buf );

  for( int i = 0; i < 8; ++i ) /* Output full hash to temp buffer */
    store32( buffer + sizeof( S->h[i] ) * i, S->h[i] );

  memcpy( out, buffer, outlen );
  return 0;
}

/* inlen, at least, should be uint64_t. Others can be size_t. */
int blake2s( uint8_t *out, const void *in, const void *key, const uint8_t outlen, const uint64_t inlen, uint8_t keylen )
{
  blake2s_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 > BLAKE2S_OUTBYTES ) return -1;

  if( keylen > BLAKE2S_KEYBYTES ) return -1;

  if( keylen > 0 )
  {
    if( blake2s_init_key( S, outlen, key, keylen ) < 0 ) return -1;
  }
  else
  {
    if( blake2s_init( S, outlen ) < 0 ) return -1;
  }

  blake2s_update( S, ( const uint8_t * )in, inlen );
  blake2s_final( S, out, outlen );
  return 0;
}

#if defined(SUPERCOP)
int crypto_hash( unsigned char *out, unsigned char *in, unsigned long long inlen )
{
  return blake2s( out, in, NULL, BLAKE2S_OUTBYTES, inlen, 0 );
}
#endif

#if defined(BLAKE2S_SELFTEST)
#include <string.h>
#include "blake2-kat.h"
int main( int argc, char **argv )
{
  uint8_t key[BLAKE2S_KEYBYTES];
  uint8_t buf[KAT_LENGTH];

  for( size_t i = 0; i < BLAKE2S_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[BLAKE2S_OUTBYTES];

    if( blake2s( hash, buf, key, BLAKE2S_OUTBYTES, i, BLAKE2S_KEYBYTES ) < 0 ||
        0 != memcmp( hash, blake2s_keyed_kat[i], BLAKE2S_OUTBYTES ) )
    {
      puts( "error" );
      return -1;
    }
  }

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


