<?php

function encrypt_e($input, $ky) {
	$key   = html_entity_decode($ky);
	$iv = "@@@@&&&&####$$$$";
	$data = openssl_encrypt ( $input , "AES-128-CBC" , $key, 0, $iv );
	return $data;
}

function decrypt_e($crypt, $ky) {
	$key   = html_entity_decode($ky);
	$iv = "@@@@&&&&####$$$$";
	$data = openssl_decrypt ( $crypt , "AES-128-CBC" , $key, 0, $iv );
	return $data;
}

function pkcs5_pad_e($text, $blocksize) {
	$pad = $blocksize - (strlen($text) % $blocksize);
	return $text . str_repeat(chr($pad), $pad);
}

function pkcs5_unpad_e($text) {
	$pad = ord($text{strlen($text) - 1});
	if ($pad > strlen($text))
		return false;
	return substr($text, 0, -1 * $pad);
}

function generateSalt_e($length) {
	$random = "";
	srand((double) microtime() * 1000000);

	$data = "AbcDE123IJKLMN67QRSTUVWXYZ";
	$data .= "aBCdefghijklmn123opq45rs67tuv89wxyz";
	$data .= "0FGH45OP89";

	for ($i = 0; $i < $length; $i++) {
		$random .= substr($data, (rand() % (strlen($data))), 1);
	}

	return $random;
}

function checkString_e($value) {
	$myvalue = ltrim($value);
	$myvalue = rtrim($myvalue);
	if ($myvalue == 'null')
		$myvalue = '';
	return $myvalue;
}

function getChecksumFromArray($arrayList, $key) {
	ksort($arrayList);
	$str = getArray2Str($arrayList);
	$salt = generateSalt_e(4);
	$finalString = $str . "|" . $salt;
	$hash = hash("sha256", $finalString);
	$hashString = $hash . $salt;
	$checksum = encrypt_e($hashString, $key);
	return $checksum;
}

function verifychecksum_e($arrayList, $key, $checksumvalue) {
	$arrayList = removeCheckSumParam($arrayList);
	ksort($arrayList);
	$str = getArray2StrForVerify($arrayList);
	$paytm_hash = decrypt_e($checksumvalue, $key);
	$salt = substr($paytm_hash, -4);

	$finalString = $str . "|" . $salt;

	$website_hash = hash("sha256", $finalString);
	$website_hash .= $salt;

	$validFlag = "FALSE";
	if ($website_hash == $paytm_hash) {
		$validFlag = "TRUE";
	} else {
		$validFlag = "FALSE";
	}
	return $validFlag;
}

function getArray2Str($arrayList) {
	$findme   = 'REFUND';
	$findmepipe = '|';
	$paramStr = "";
	$flag = 1;	
	foreach ($arrayList as $key => $value) {
		$pos = strpos($value, $findme);
		$pospipe = strpos($value, $findmepipe);
		if ($pos !== false || $pospipe !== false) 
		{
			continue;
		}
		
		if ($flag) {
			$paramStr .= checkString_e($value);
			$flag = 0;
		} else {
			$paramStr .= "|" . checkString_e($value);
		}
	}
	return $paramStr;
}

function getArray2StrForVerify($arrayList) {
	$paramStr = "";
	$flag = 1;
	foreach ($arrayList as $key => $value) {
		if ($flag) {
			$paramStr .= checkString_e($value);
			$flag = 0;
		} else {
			$paramStr .= "|" . checkString_e($value);
		}
	}
	return $paramStr;
}

function redirect2PG($paramList, $key) {
	$hashString = getchecksumFromArray($paramList);
	$checksum = encrypt_e($hashString, $key);
}

function removeCheckSumParam($arrayList) {
	if (isset($arrayList["CHECKSUMHASH"])) {
		unset($arrayList["CHECKSUMHASH"]);
	}
	return $arrayList;
}
function callAPI($apiURL, $requestParamList)
{
    $jsonResponse      = "";
    $responseParamList = array();
    $JsonData          = json_encode($requestParamList);
    $postData          = 'JsonData=' . urlencode($JsonData);
    $ch                = curl_init($apiURL);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/json',
        'Content-Length: ' . strlen($postData)
    ));
    $jsonResponse      = curl_exec($ch);
    $responseParamList = json_decode($jsonResponse, true);
    return $responseParamList;
}

function callNewAPI($apiURL, $requestParamList) {
	$responseParamList = array();
	$JsonData = json_encode($requestParamList);
	$postData = 'JsonData='.urlencode($JsonData);
	$ch = curl_init($apiURL);
	curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
	curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
	
	curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);

	curl_setopt($ch, CURLOPT_HTTPHEADER, array(
		'Content-Type: application/json', 
		'Content-Length: ' . strlen($postData))
	);
	$jsonResponse = curl_exec($ch);   
	return json_decode($jsonResponse, true);
}
