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JS code do conversion between hexStr and byteArray

2015-05-20 00:51 381 查看

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title> Online Cryptographic Calculator</title>

</head>

<input style="width:80%" id="input" value="12-AB">

<input type="button" value="Calculate" onclick="output.value=buttonHandler(input.value)">

<textarea style="width:80%" rows=10 id=output></textarea>

<script>

/* Convert a hex char to value */

function hexChar2byte(c)

{

var d = 0;

if (c>='A' && c<='F')

{

d = c.charCodeAt(0) - 'A'.charCodeAt(0) + 10;

}

else if (c>='a' && c<='f')

{

d = c.charCodeAt(0) - 'a'.charCodeAt(0) + 10;

}

else if (c>='0' && c<='9')

{

d = c.charCodeAt(0) - '0'.charCodeAt(0);

}

return d;

}

/* Check if a char is hex char */

function isHexChar(c)

{

if ((c>='A' && c<='F') ||

(c>='a' && c<='a') ||

(c>='0' && c<='9'))

{

return 1;

}

return 0;

}

/* Convert HEX string to byte array */

function hexStr2byteArray(str)

{

var byteArray = Array();

var d = 0;

var i = 0;

var j = 0;

var k = 0;

for (i=0; i<str.length; i++)

{

var c = str.charAt(i);

if (isHexChar(c))

{

d <<= 4;

d += hexChar2byte(c);

j++;

if (0==(j%2))

{

byteArray[k++] = d;

d = 0;

}

}

}

return byteArray;

}

/* Convert a byte to string */

function byte2hexStr(byte)

{

var hexByteMap = "0123456789ABCDEF";

var str = "";

str += hexByteMap.charAt(byte >> 4);

str += hexByteMap.charAt(byte & 0x0f);

return str;

}

/* Convert byte arry to HEX string */

function byteArray2hexStr(byteArray)

{

var str = "";

for (var i=0; i<(byteArray.length-1); i++)

{

str += byte2hexStr(byteArray[i]);

str += "-";

}

str += byte2hexStr(byteArray[i]);

return str;

}

/* Button handler */

function buttonHandler(str)

{

return byteArray2hexStr(hexStr2byteArray(str));

}

</script>

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