CODEWITHSUNDEEP
cbit-manipulationbit
Sophia Larson
Sophia Larson

Reputation: 13

How to take to nibbles from a byte of data that are chars into two bytes stored in another variable in order to unmask

I have two uint_16ts that I've gotten from the nibbles of my data as seen in the code below. I need to put that into mask set so that each of the nibbles are now in its own byte. The code I got is below I can't for the life of me figure it out. I need to do this cause this will create the mask I will use to unmask mildly encrypted data.

uint16_t length = *(offset+start) - 3;
uint16_t mask = length;
if(Fmt == ENCRYPTED) {
    char frstDig = (length & 0x000F)
    char scndDig = (length & 0x00F0) >> 4;
    mask =

Upvotes: 1

Views: 258

Answers (1)

Barmar
Barmar

Reputation: 781741

Shift one of the digits by 8 bits, and OR them together.

mask = (scndDig << 8) | frstDig;

Upvotes: 1

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