Hashing issue on the raspberry pi

[jugOS-19]

I have been trying to use this great tool on the raspberry pi and although downloading files works fine, the hash comparison does not seem to be working.

As far as I can tell, there are 2 issues:

• The piping is not working since all the local files give the same result. This piping seems to not be working as intended: echo -ne $shaHex | shasum -a 256
• I tried manually calculating the hash (line by line, and copy/pasting the result into the next one) and different hashes are returned, although none are matching what the dropbox hash is indicating. Maybe this sed 's/\([0-9A-F]\{2\}\)/\\x\1/gI' is not doing what the API means by hex-encode? I really don't undestand what "hex-encode" means :(

Thanks for this tool! Please continue with the development.

[jugOS-19]

So, after a lot of resesearching i found a solution. It works for the raspberry pi but not sure for other *nix OSes.

• The first issue was some missing quotes on the echo at the end of the db_sha_local function.
• The second was the order that things has to be done in the hassing algorithm (the sed bit was perfectly fine)

So, this is the function that now works for me

function db_sha_local
{
    local FILE=$(normalize_path "$1")
    local FILE_SIZE=$(file_size "$FILE")
    local OFFSET=0
    local SKIP=0
    local SHA_CONCAT=""

    which shasum > /dev/null
    if [[ $? != 0 ]]; then
        echo "ERR"
        return
    fi

    while ([[ $OFFSET -lt "$FILE_SIZE" ]]); do
        dd if="$FILE" of="$CHUNK_FILE" bs=4194304 skip=$SKIP count=1 2> /dev/null
        if [[ "`uname -s`" = "Darwin" ]]
        then
            local SHA=$(shasum -a 256 "$CHUNK_FILE" | awk '{print $1}' | sed 's/\([0-9A-Fa-f]\{2\}\)/\\x\1/g')
            SHA_CONCAT="${SHA_CONCAT}${SHA}"
        else
            local SHA=$(shasum -a 256 "$CHUNK_FILE" | awk '{print $1}' | sed 's/\([0-9A-F]\{2\}\)/\\x\1/gI')
            SHA_CONCAT="${SHA_CONCAT}${SHA}"
        fi
        let OFFSET=$OFFSET+4194304
        let SKIP=$SKIP+1
    done

    echo -ne "$SHA_CONCAT" | shasum -a 256 | awk '{print $1}'
}