Dotaz: php mcrypt decrypt - kde je chyba?

[adrinko]

prosím vás, encryptujem reťazec ok, ale ako ho decryptujem?

	$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');

	$iv_size = mcrypt_enc_get_iv_size($cipher);
	printf("iv_size = %d\n",$iv_size);

	$key256 = '12345678901234561234567890123456';
	$key128 = '1234567890123456';

	$iv =  '1234567890123456';
	
	printf("iv: %s\n",bin2hex($iv));
	printf("key256: %s\n",bin2hex($key256));
	printf("key128: %s\n",bin2hex($key128));
	
	// This is the plain-text to be encrypted:
	$cleartext = "The quick brown fox jumped over the lazy dog +ľščťžýáíé:,-ôlúä´=;°°%ˇ(/!\")_:?";
	printf("plainText: %s\n\n",$cleartext);

	if (mcrypt_generic_init($cipher, $key256, $iv) != -1)
	{
		// PHP pads with NULL bytes if $cleartext is not a multiple of the block size..
		$cipherText = mcrypt_generic($cipher,$cleartext );
		//mcrypt_generic_deinit($cipher);
		
		// Display the result in hex.
		printf("256-bit encrypted result:\n%s\n\n",bin2hex($cipherText));
	}

  $cleartext2="2fddc3abec692e1572d9b7d629172a05caf230bc7c8fd2d26ccfd65f9c545269e2eb156091fd107608ae3cede2de06681f9fbcb8135431f960623f036b276f87be88604a9805bb397e72ec9a508174081a6b1291aa609d6a9529324b52ad2b47";

		$cipherText2 = mdecrypt_generic($cipher,$cleartext2 );
		mcrypt_generic_deinit($cipher);
		
		// Display the result in hex.
		echo "256-bit DECRYPTED result:".$cipherText2;

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Odpovědi

[adrinko]

za $cleartext2 treba doplniť:

function hex2bin($h) //tuto funkciu treba, tato nie je nativna v php. ale kupodivu bin2hex je.
  {
  if (!is_string($h)) return null;
  $r='';
  for ($a=0; $a< strlen ($h); $a+=2) { $r.=chr(hexdec($h{$a}.$h{($a+1)})); }
  return $r;
  }	
$cleartext2=hex2bin($cleartext2);