All uses of `get_random()` were in the form of:
`&get_random(vec![0u8; SIZE])`
with `SIZE` being a constant.
Building a `Vec` is unnecessary for two reasons. First, it uses a
very short-lived dynamic memory allocation. Second, a `Vec` is a
resizable object, which is useless in those context when random
data have a fixed size and will only be read.
`get_random_bytes()` takes a constant as a generic parameter and
returns an array with the requested number of random bytes.
Stack safety analysis: the random bytes will be allocated on the
caller stack for a very short time (until the encoding function has
been called on the data). In some cases, the random bytes take
less room than the `Vec` did (a `Vec` is 24 bytes on a 64 bit
computer). The maximum used size is 180 bytes, which makes it
for 0.008% of the default stack size for a Rust thread (2MiB),
so this is a non-issue.
Also, most of the uses of those random bytes are to encode them
using an `Encoding`. The function `crypto::encode_random_bytes()`
generates random bytes and encode them with the provided
`Encoding`, leading to code deduplication.
`generate_id()` has also been converted to use a constant generic
parameter as well since the length of the requested String is always
a constant.
Samuel Tardieu
d0baa23f9a