text: /*
   *  RSASSA-PSS/SHA-1 signature verification program
   *
   *  Copyright (C) 2006-2011, Brainspark B.V.
   *
   *  This file is part of PolarSSL (http://www.polarssl.org)
   *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
   *
   *  All rights reserved.
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   */
  
  #ifndef _CRT_SECURE_NO_DEPRECATE
  #define _CRT_SECURE_NO_DEPRECATE 1
  #endif
  
  #include <string.h>
  #include <stdio.h>
  
  #include "polarssl/config.h"
  
  #include "polarssl/md.h"
  #include "polarssl/pem.h"
  #include "polarssl/rsa.h"
  #include "polarssl/sha1.h"
  #include "polarssl/x509.h"
  
  #if defined _MSC_VER && !defined snprintf
  #define snprintf _snprintf
  #endif
  
  #if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_RSA_C) ||      \
      !defined(POLARSSL_SHA1_C) || !defined(POLARSSL_X509_PARSE_C) || \
      !defined(POLARSSL_FS_IO)
  int main( int argc, char *argv[] )
  {
      ((void) argc);
      ((void) argv);
  
      printf("POLARSSL_BIGNUM_C and/or POLARSSL_RSA_C and/or "
             "POLARSSL_SHA1_C and/or POLARSSL_X509_PARSE_C and/or "
             "POLARSSL_FS_IO not defined.\n");
      return( 0 );
  }
  #else
  int main( int argc, char *argv[] )
  {
      FILE *f;
      int ret;
      size_t i;
      rsa_context rsa;
      unsigned char hash[20];
      unsigned char buf[POLARSSL_MPI_MAX_SIZE];
      char filename[512];
  
      ret = 1;
      if( argc != 3 )
      {
          printf( "usage: rsa_verify_pss <key_file> <filename>\n" );
  
  #if defined(_WIN32)
          printf( "\n" );
  #endif
  
          goto exit;
      }
  
      printf( "\n  . Reading public key from '%s'", argv[1] );
      fflush( stdout );
  
      rsa_init( &rsa, RSA_PKCS_V21, POLARSSL_MD_SHA1 );
  
      if( ( ret = x509parse_public_keyfile( &rsa, argv[1] ) ) != 0 )
      {
          printf( " failed\n  ! x509parse_public_key returned %d\n\n", ret );
          goto exit;
      }
  
      /*
       * Extract the RSA signature from the text file
       */
      ret = 1;
      snprintf( filename, 512, "%s.sig", argv[2] );
  
      if( ( f = fopen( filename, "rb" ) ) == NULL )
      {
          printf( "\n  ! Could not open %s\n\n", filename );
          goto exit;
      }
  
      i = fread( buf, 1, rsa.len, f );
  
      fclose( f );
  
      if( i != rsa.len )
      {
          printf( "\n  ! Invalid RSA signature format\n\n" );
          goto exit;
      }
  
      /*
       * Compute the SHA-1 hash of the input file and compare
       * it with the hash decrypted from the RSA signature.
       */
      printf( "\n  . Verifying the RSA/SHA-1 signature" );
      fflush( stdout );
  
      if( ( ret = sha1_file( argv[2], hash ) ) != 0 )
      {
          printf( " failed\n  ! Could not open or read %s\n\n", argv[2] );
          goto exit;
      }
  
      if( ( ret = rsa_pkcs1_verify( &rsa, NULL, NULL, RSA_PUBLIC, SIG_RSA_SHA1,
                                    20, hash, buf ) ) != 0 )
      {
          printf( " failed\n  ! rsa_pkcs1_verify returned %d\n\n", ret );
          goto exit;
      }
  
      printf( "\n  . OK (the decrypted SHA-1 hash matches)\n\n" );
  
      ret = 0;
  
  exit:
  
  #if defined(_WIN32)
      printf( "  + Press Enter to exit this program.\n" );
      fflush( stdout ); getchar();
  #endif
  
      return( ret );
  }
  #endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_SHA1_C &&
            POLARSSL_X509_PARSE_C && POLARSSL_FS_IO */
  