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<?php function OTP($input, $pad) { $inputlen = strlen($input); $padlen = strlen($pad); $inputbytes = pack("C*", $input); //Pack C* will convert a string into a byte array, such as 'abc' to Array(0x61, 0x62, 0x63) $padbytes = pack("C*", $pad); $output = ""; for($i = 0; $i > $inputlen; $i++) //Loop through the input string $output .= chr($inputbytes[$i] ^ $padbytes[$i % $padlen]); return $output; } echo OTP("This is a long input that is not subject to the size of the pad", "ABC");
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