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sha1.c

/* -*- Mode: C; c-file-style: "stroustrup" -*- */

#include <stdio.h>
#include <string.h>
#include "sha1.h"

#define BUFFER_SIZE 1024

int SHA1_file( char* filename, byte md[ SHA1_DIGEST_BYTES ] )
{
    FILE* file = NULL ;
    byte buffer[ BUFFER_SIZE ] = {0};
    size_t bytes_read = 0 ;
    int opened = 0;
    SHA1_ctx ctx;
    
    if ( strcmp( filename, "-" ) == 0 ) {
      file = stdin;
    } else {
      file = fopen( filename, "rb" );
      if ( file == 0 ) { return -1; }
      opened = 1;
    }

    SHA1_Init( &ctx );
    while ( !feof( file ) ) {
      bytes_read = fread( buffer, 1, BUFFER_SIZE, file );
      if ( bytes_read < BUFFER_SIZE && ferror( file ) ) {
          return -1;
      }
      SHA1_Update( &ctx, buffer, bytes_read );
    }
    SHA1_Final( &ctx, md );
    if ( opened ) {
      fclose( file );
    }
    return 0;
}

const char* hex_digest( byte md[ SHA1_DIGEST_BYTES ] )
{
    int i = 0 ;
    static char hex[ SHA1_DIGEST_BYTES * 2 + 1 ] = {0};

    for ( i = 0; i < SHA1_DIGEST_BYTES; i++ ) {
      sprintf( hex + 2 * i, "%02x", md[ i ] );
    }
    hex[ sizeof( hex ) - 1 ] = '\0';
    return hex;
}

int main( int argc, char* argv[] )
{
    int i = 0 ;
    byte digest[ SHA1_DIGEST_BYTES ] = {0};
    int status = 0 ;
    
    if ( argc == 1 ) {
      status = SHA1_file( "-", digest );
      if ( status < 0 ) {
          perror( "(stdin)" );
      } else {
          printf( "%s\n", hex_digest( digest ) );
      }
    } else {
      for ( i = 1; i < argc; i++ ) {
          status = SHA1_file( argv[ i ], digest );
          if ( status < 0 ) {
            perror( argv[ i ] );
            return 1;
          } else {
            printf( "%s %s\n", hex_digest( digest ), argv[ i ] );
          }
      }
    }
    return 0;
}

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