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#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include "blake2.h"
#include "blake2-impl.h"
int blake2xs_init( blake2s_state *S, const uint16_t outlen, const void *key, const uint8_t keylen)
{
blake2s_param P[1];
if ( !outlen ) return -1;
P->digest_length = BLAKE2S_OUTBYTES;
P->key_length = keylen;
P->fanout = 1;
P->depth = 1;
store32( &P->leaf_length, 0 );
store32( &P->node_offset, 0 );
store16( &P->xof_length, outlen );
P->node_depth = 0;
P->inner_length = 0;
memset( P->salt, 0, sizeof( P->salt ) );
memset( P->personal, 0, sizeof( P->personal ) );
if( blake2s_init_param( S, P ) < 0 ) return -1;
if (keylen)
{
if ( !key || keylen > BLAKE2S_KEYBYTES ) 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 );
}
return 0;
}
int blake2xs_update( blake2s_state *S, const uint8_t *in, uint64_t inlen )
{
if ( !in ) return -1;
return blake2s_update( S, in, inlen );
}
int blake2xs_final( blake2s_state *S, uint8_t *out, const uint16_t outlen ) {
blake2s_state C[1];
blake2s_param P[1];
int i;
uint16_t last_index = outlen/BLAKE2S_OUTBYTES;
uint8_t root[BLAKE2S_BLOCKBYTES];
if ( !out ) return 1;
/* Finalize the root hash */
if (blake2s_final( S, root, BLAKE2S_OUTBYTES ) < 0 )
return -1;
/* Set common block structure values */
P->digest_length = BLAKE2S_OUTBYTES;
P->key_length = 0;
P->fanout = 0;
P->depth = 0;
store32( &P->leaf_length, BLAKE2S_OUTBYTES );
store16( &P->xof_length, outlen );
P->inner_length = 0;
P->node_depth = 0;
memset( P->salt, 0, sizeof( P->salt ) );
memset( P->personal, 0, sizeof( P->personal ) );
for( i = 0; i < last_index; ++ i ) {
/* Initialize state */
store32( &P->node_offset, i );
if( blake2s_init_param( C, P ) < 0 ) return -1;
/* Process key if needed */
blake2s_update( C, root, BLAKE2S_OUTBYTES);
blake2s_final( C, out + i*BLAKE2S_OUTBYTES, BLAKE2S_OUTBYTES );
}
/* Last instance */
store32( &P->node_offset, last_index);
P->digest_length = outlen % BLAKE2S_OUTBYTES;
if( blake2s_init_param( C, P ) < 0 ) return -1;
blake2s_update( C, root, BLAKE2S_OUTBYTES);
blake2s_final( C, out + last_index*BLAKE2S_OUTBYTES, outlen % BLAKE2S_OUTBYTES );
return 0;
}
int blake2xs( uint8_t *out, const void *in, const void *key, const
uint16_t outlen, const uint64_t inlen, const 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( keylen > BLAKE2S_KEYBYTES ) return -1;
if( !outlen ) return -1;
/* Initialize the root block structure */
if ( blake2xs_init( S, outlen, key, keylen ) < 0 ) {
return -1;
}
/* Compute the root of the tree */
if ( blake2xs_update( S, ( const uint8_t * )in, inlen ) < 0 )
return -1;
/* Compute the final hash using the counter construction */
blake2xs_final( S, out, outlen );
return 0;
}
#if defined(BLAKE2XS_SELFTEST)
#include <string.h>
#include "blake2-kat.h"
int main( int argc, char **argv )
{
uint8_t key[BLAKE2S_KEYBYTES];
uint8_t buf[BLAKE2_KAT_LENGTH];
for( size_t i = 0; i < BLAKE2S_KEYBYTES; ++i )
key[i] = ( uint8_t )i;
for( size_t i = 0; i < BLAKE2_KAT_LENGTH; ++i )
buf[i] = ( uint8_t )i;
for( size_t i = 0; i < BLAKE2_KAT_LENGTH; ++i )
{
uint8_t hash[BLAKE2_KAT_LENGTH];
blake2xs( hash, buf, key, i, BLAKE2_KAT_LENGTH, BLAKE2S_KEYBYTES );
for( size_t j = 0; j < i; ++j ) {
printf("%02x", hash[j]);
}
printf("\n");
}
//puts( "ok" );
return 0;
}
#endif
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