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XOR Hex string help in C or C++

post #1 of 6

6/30/12 at 1:38pm

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trumpet-205
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I need help to xor two hex strings together. It has been a long time since I touched programming so I have issue here. Basically I have two hex strings in the length of 166, like this,

29460ba9babebbbefd001547a810e67149caee11d945cd7fc81a05e9f85aac650e9052ba6a8cd8257bf14d13e6f0a803b54fde9e77472dbff89d71b57bddef121336cb85ccb8f3315f4b52e301d16e9f52f904

I need to store these hex strings, xor them together, then print the result back (still in the form of hex string). I don't know how to store something this long in a variable.

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post #2 of 6

6/30/12 at 1:40pm

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Quote:

Originally Posted by trumpet-205

I need help to xor two hex strings together. It has been a long time since I touched programming so I have issue here. Basically I have two hex strings in the length of 166, like this,

29460ba9babebbbefd001547a810e67149caee11d945cd7fc81a05e9f85aac650e9052ba6a8cd8257bf14d13e6f0a803b54fde9e77472dbff89d71b57bddef121336cb85ccb8f3315f4b52e301d16e9f52f904

I need to store these hex strings, xor them together, then print the result back. I don't know how to store something this long in a variable.

Not sure if this would work (I know ZERO of C++) but couldn't you dump it to a temporary .dat file?

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post #3 of 6

6/30/12 at 1:45pm

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This is actually for an assignment on cryptography. I was given 12 cipher texts and asked to decrypt one. To do that I first need to xor them together.

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post #4 of 6

6/30/12 at 8:24pm

tompsonn
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I would do it by converting each hex character in the string to its numerical equivalent. Then XOR the numbers, and then convert the result back to hex.

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post #5 of 6

6/30/12 at 10:03pm

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Quote:

Originally Posted by tompsonn

I would do it by converting each hex character in the string to its numerical equivalent. Then XOR the numbers, and then convert the result back to hex.

You mean hex to binary? Wouldn't that make it even longer? How would I go about storing them in the variable?

Someone wrote a Java program on exactly what I am looking for, but the program is limited to 256-bit at a time.
http://www.unsw.adfa.edu.au/~lpb/src/XORcalc/index.html
Edited by trumpet-205 - 6/30/12 at 10:05pm

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post #6 of 6

6/30/12 at 11:01pm

tompsonn
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Quote:

Originally Posted by trumpet-205

You mean hex to binary? Wouldn't that make it even longer? How would I go about storing them in the variable?
Someone wrote a Java program on exactly what I am looking for, but the program is limited to 256-bit at a time.
http://www.unsw.adfa.edu.au/~lpb/src/XORcalc/index.html

No I don't mean hex to binary. You have two hex strings. Convert each unicode character in hex to its decimal equivalent, XOR the results and then convert the result back to a hex string. Because both strings are the same length, this should be fairly easy.
You don't need to store anything apart from the two hex strings and the result of XORing - which you will accomplish using a character array.

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