original_string: static function verifySignature($textToVerify, $signatureInBase64, $publicKeyFile) {
  
  		if (!function_exists("openssl_get_privatekey")) {
  			throw new CryptoException("OpenSSL extension in PHP is required. Please install or enable it.");
  		}
  
  		if (!file_exists($publicKeyFile) or !is_readable($publicKeyFile)) {
  			throw new CryptoException("Public key file \"$publicKeyFile\" not found or not readable.");
  		}
  
  		$keyAsString = file_get_contents($publicKeyFile);
  		$publicKeyId = openssl_get_publickey($keyAsString);
  
  		$signature = base64_decode($signatureInBase64);
  
  		$res = openssl_verify($textToVerify, $signature, $publicKeyId, self::HASH_METHOD);
  		openssl_free_key($publicKeyId);
  
  		if ($res == -1) {
  			throw new CryptoException("Verification of signature failed: ".openssl_error_string());
  		}
  
  		return $res ? true : false;
  	}
code: static function verifySignature($textToVerify, $signatureInBase64, $publicKeyFile) {
  
  		if (!function_exists("openssl_get_privatekey")) {
  			throw new CryptoException("OpenSSL extension in PHP is required. Please install or enable it.");
  		}
  
  		if (!file_exists($publicKeyFile) or !is_readable($publicKeyFile)) {
  			throw new CryptoException("Public key file \"$publicKeyFile\" not found or not readable.");
  		}
  
  		$keyAsString = file_get_contents($publicKeyFile);
  		$publicKeyId = openssl_get_publickey($keyAsString);
  
  		$signature = base64_decode($signatureInBase64);
  
  		$res = openssl_verify($textToVerify, $signature, $publicKeyId, self::HASH_METHOD);
  		openssl_free_key($publicKeyId);
  
  		if ($res == -1) {
  			throw new CryptoException("Verification of signature failed: ".openssl_error_string());
  		}
  
  		return $res ? true : false;
  	}
code_tokens: static function verifySignature ( $ textToVerify , $ signatureInBase64 , $ publicKeyFile ) { if ( ! function_exists ( "openssl_get_privatekey" ) ) { throw new CryptoException ( "OpenSSL extension in PHP is required. Please install or enable it." ) ; } if ( ! file_exists ( $ publicKeyFile ) or ! is_readable ( $ publicKeyFile ) ) { throw new CryptoException ( "Public key file \"$publicKeyFile\" not found or not readable." ) ; } $ keyAsString = file_get_contents ( $ publicKeyFile ) ; $ publicKeyId = openssl_get_publickey ( $ keyAsString ) ; $ signature = base64_decode ( $ signatureInBase64 ) ; $ res = openssl_verify ( $ textToVerify , $ signature , $ publicKeyId , self :: HASH_METHOD ) ; openssl_free_key ( $ publicKeyId ) ; if ( $ res == - 1 ) { throw new CryptoException ( "Verification of signature failed: " . openssl_error_string ( ) ) ; } return $ res ? true : false ; }
docstring: Verifies signature of a string
  
  @param string $textToVerify The text that was signed
  @param string $signatureInBase64 The signature encoded with Base64
  @param string $publicKeyFile Path to file where bank's public key is saved
  (you can obtain it from bank's app https://iposman.iplatebnibrana.csob.cz/posmerchant
  or from their package on GitHub)
  @return bool True if signature is correct
  @throws CryptoException When some cryptographic operation fails and key file path is not valid
docstring_tokens: Verifies signature of a string