Calculating the checksum of a string

Using Arduino Interfacing w/ Software on the Computer
1

How to calculate the ckecksum XOR of a string to send via Serial, as full string security?
Thank you in advance

2

I assume you are looking for a CRC check rather than a simple checksum
have a look at CRC8-Library

1 Like
3

receive the whole string, put it in array and calculate CRC byte by byte

4

I do it the easy way, I process each byte as it comes in then after the last byte I do the xor and inc and it is there.

5

checksums are typically added to data to ensure integrity..
hashes of strings are used to add a bit of security..

for some reason i'm thinking you're looking for a hash function, i could be wrong..

//djb2
uint32_t hash(char *str){
    uint32_t hash = 5381;
    int c;
    while (c = *str++)
        hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
    return hash;
}

Happy New Year!!

good luck.. ~q

6

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