Converting Java code to php - maybe about hex to binary

Question

I have this code here in Java that I wish to convert to PHP. It is possibly related to converting from ascii to binary, then to hex, but I am not quite sure myself. Could anybody help please?

String clearKey = "test";
char [] hexArray = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
byte [] bytes = clearKey.getBytes();
String keyId = "";
for (int i = 0 ; i < clearKey.length() ; i ++) {
    keyId = keyId + hexArray[(bytes[i] & 0xFF) / 16] + hexArray[(bytes[i] & 0xFF) % 16];
}
System.out.println(keyId);

Here is what I got so far:

The second line of the code can probably be converted into this:

$bytes = bin2hex($clearKey);

But I don't know what the equivalent of following code in php:

hexArray[(bytes[i] & 0xFF) / 16] + hexArray[(bytes[i] & 0xFF) % 16];

Additional Information

I converted this code into correct Java syntax.

@p11y Up to the point of the missing parentheses in the for/next loop, but I'm pretty sure it is Java otherwise — Maarten Bodewes
– Maarten Bodewes, Commented Jan 22, 2014 at 8:17
@owlstead yes, there are some mistakes in the code. For example, there's also no type called bytes, the author probably meant byte. However, the array notation and the getBytes() immediately made me think of Java. — Patrick Oscity
– Patrick Oscity, Commented Jan 22, 2014 at 8:22
I wonder if there is a way for me to run this code somewhere (after some fixes in parentheses) to help me comparing the results? — jaycode
– jaycode, Commented Jan 23, 2014 at 3:18

Patrick Oscity · Accepted Answer · 2014-01-22 08:31:36Z

1

It's a hex encoder using table lookup. It converts a string to bytes using the default character encoding of the platform. Then it converts those bytes to hexadecimals. The line you question calculates the hex digit for the high and low 4 bits of the byte. The entire line therefore encodes a single byte to two hexadecimal characters.

The PHP equivalent of this Java code is

$keyId = unpack('H*', $clearKey)[1];

edited Jan 22, 2014 at 8:31

answered Jan 22, 2014 at 8:07

Patrick Oscity

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2 Comments

jaycode Over a year ago

Tried this, but result is different, is there anyway you could provide a proof that the code shows similarly with the java one in my question?

jaycode Over a year ago

Nevermind my comment above, I created here: Java: ideone.com/MZ4TLH Php: ideone.com/VDYWRs

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