util/curve25519.js
function cpy32 (d, s) {
        for (var i = 0; i < 32; i++)
            d[i] = s[i];
    }
function cpy32 (d, s) {
        for (var i = 0; i < 32; i++)
            d[i] = s[i];
    }
function cpy32 ( d , s ) { for ( var i = 0 ; i < 32 ; i ++ ) d [ i ] = s [ i ] ; }
endregion region radix 2^8 math
endregion region radix 2^8 math