how to convert string to array of 32 bit integers?

I want to send the string to an encryption function which accepts an array of four (32-bit) integers. So how to convert string to array of 32 bit integers in javascript and divide it to send it to functio开发者_StackOverflow社区n?

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This smells of homework, but here you go.

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Method 1:

Assuming you want to convert four characters in a string to ints, this will work:

// Declare your values.
var myString = "1234";

// Convert your string array to an int array.
var numberArray[myString.length];
for (var i = 0; i < myString.length]; i++)
{
    numberArray[i] = int.parseInt(myString[i]);
}

// Call your function.
MyEncryptionFunction(numberArray);

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Method 2:

Assuming you want to convert four characters to the numeric values of their chars, this will work:

// Declare your values.
var myString = "1,2,3,4";

// Convert your string array to an int array.
var numberArray[myString.length];
for (var i = 0; i < myString.length]; i++)
{
    numberArray[i] = myString.charCodeAt(i);
}

// Call your function.
MyEncryptionFunction(numberArray);

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Method 3:

Assuming you want to split a group of four numbers separated by a consistent delimiter, this will work.

// Declare your values.
var splitter = ",";
var myString = "1,2,3,4";

// Convert myString to a string array.
var stringArray[] = myString.split(splitter);

// Convert your string array to an int array.
var numberArray[stringArray.length];
for (var i = 0; i < stringArray.length]; i++)
{
    numberArray[i] = int.parseInt(stringArray[i]);
}

// Call your function.
MyEncryptionFunction(numberArray);

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Use string.charCodeAt(i), to get the numeric char code of string string at position i. Depending on your used encryption, you can apply an own compression method, to combine multiple char codes (most char codes are far smaller than 32 bits).

Example of separating a string in an array consisting of pairs (4 chars):

var string = "A sstring dum doo foo bar";
var result = [];
string += Array((5-(string.length%4))%5).join(" "); //Adding padding at the end
for(var i=3, len=string.length; i<len; i+=4){
    result.push([string.charCodeAt(i-3), string.charCodeAt(i-2),
             string.charCodeAt(i-1), string.charCodeAt(i)]);
}