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|
#!/bin/bash
denominate_function()
{
declare -n func_name="$1"
local func_output_b64encoded output_hash
read -r -d '' \
func_output_b64encoded \
< <(base64) || [ "${func_output_b64encoded}" ]
read output_hash _ \
< <(base64 -d <<< "$func_output_b64encoded" | sha256sum)
[ ${#output_hash} = 64 ] || return
func_name=SHA256_${output_hash:0:32}
source <(cat <<END
${func_name} ()
{
base64 -d <<.
${func_output_b64encoded}
.
}
END
)
}
reverse_hash()
{
case "$#.$1" in
2.SHA256 )
;;
1.SHA256_???????????????????????????????? )
set -- SHA256 "${1#SHA256_}"
;;
* )
return 1
;;
esac
case ${#2} in
32 | 64 )
set -- "${1}_${2: 0 : 32}"
;;
* )
return 1
;;
esac
(
set -o pipefail
set -e
declare -f "$1" |
sed -n -e '/^[ ]*base64 -d <<[.]$/,/^[.]$/ { p }' |
sed -e '1 d ; $ d' |
base64 -d
)
}
example_input()
{
sed -n -e '/^reverse_hash *()/ , /^}$/ p' <"$0"
}
set -e
set -o pipefail
if [ -t 0 ]
then
if [ $# = 0 ]
then
denominate_function f < <(example_input)
else
denominate_function f <<< "$*"
fi
else
denominate_function f
fi
read -r -d '' < <( reverse_hash "$f" | base64) || [ "$REPLY" ]
if read s _ < <( base64 -d <<< "$REPLY" | sha256sum ) &&
[ ${#s} -eq 64 -a "${s: 0 : 32}" = "${f: -32 : 32}" ]
then
declare -f "$f" | grep . &&
printf '%s\n' "$f"
else
false
fi
|
