Fuzz Base64 and Base64URL (#4853)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

scripts/tests/base64.sh

@@ -1,31 +0,0 @@
-#!/usr/bin/env bash
-
-set -euo pipefail
-
-_encode() {
-  # - Print the input to stdout
-  # - Remove the first two characters
-  # - Convert from hex to binary
-  # - Convert from binary to base64
-  # - Remove newlines from `base64` output
-  echo -n "$1" | cut -c 3- | xxd -r -p | base64 | tr -d \\n
-}
-
-encode() {
-  # - Convert from base64 to hex
-  # - Remove newlines from `xxd` output
-  _encode "$1" | xxd -p | tr -d \\n
-}
-
-encodeURL() {
-  # - Remove padding from `base64` output
-  # - Replace `+` with `-`
-  # - Replace `/` with `_`
-  # - Convert from base64 to hex
-  # - Remove newlines from `xxd` output
-  _encode "$1" | sed 's/=//g' | sed 's/+/-/g' | sed 's/\//_/g' | xxd -p | tr -d \\n
-}
-
-# $1: function name
-# $2: input
-$1 $2