Line data    Source code

       1             : #ifndef HEADER_fd_src_app_fddev_genesis_hash_h
       2             : #define HEADER_fd_src_app_fddev_genesis_hash_h
       3             : 
       4             : #include "../../ballet/sha256/fd_sha256.h"
       5             : 
       6             : #include <stdio.h>
       7             : 
       8             : static inline ushort
       9             : compute_shred_version( char const * genesis_path,
      10           0 :                        uchar      * opt_gen_hash  ) {
      11             :   /* Compute the shred version and the genesis hash */
      12           0 :   fd_sha256_t _sha[ 1 ];  fd_sha256_t * sha = fd_sha256_join( fd_sha256_new( _sha ) );
      13           0 :   fd_sha256_init( sha );
      14           0 :   uchar buffer[ 4096 ];
      15             : 
      16           0 :   FILE * genesis_file = fopen( genesis_path, "r" );
      17           0 :   if( FD_UNLIKELY( !genesis_file ) ) {
      18           0 :     if( FD_LIKELY( errno==ENOENT ) ) return (ushort)0;
      19             : 
      20           0 :     FD_LOG_ERR(( "Opening genesis file (%s) failed (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      21           0 :   }
      22             : 
      23           0 :   while( !feof( genesis_file ) ) {
      24           0 :     ulong read = fread( buffer, 1UL, sizeof(buffer), genesis_file );
      25           0 :     if( FD_UNLIKELY( ferror( genesis_file ) ) )
      26           0 :       FD_LOG_ERR(( "fread failed `%s` (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      27             : 
      28           0 :     fd_sha256_append( sha, buffer, read );
      29           0 :   }
      30             : 
      31           0 :   if( FD_UNLIKELY( fclose( genesis_file ) ) )
      32           0 :     FD_LOG_ERR(( "fclose failed `%s` (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      33             : 
      34           0 :   union {
      35           0 :     uchar  c[ 32 ];
      36           0 :     ushort s[ 16 ];
      37           0 :   } hash;
      38           0 :   fd_sha256_fini( sha, hash.c );
      39           0 :   fd_sha256_delete( fd_sha256_leave( sha ) );
      40             : 
      41           0 :   if( FD_LIKELY( opt_gen_hash ) ) memcpy( opt_gen_hash, hash.c, 32UL );
      42             : 
      43           0 :   ushort xor = 0;
      44           0 :   for( ulong i=0UL; i<16UL; i++ ) xor ^= hash.s[ i ];
      45             : 
      46           0 :   xor = fd_ushort_bswap( xor );
      47           0 :   return fd_ushort_if( xor<USHORT_MAX, (ushort)(xor + 1), USHORT_MAX );
      48           0 : }
      49             : 
      50             : #endif /* HEADER_fd_src_app_fddev_genesis_hash_h */