Test integrity of a given file, with a given hash. Supports MD5 and SHA256.

test_integrity.sh

#!/bin/bash
filename=$1
hash=${2^^}
algo=sha256

[[ -n "$3" ]] && algo=$3

if [[ ! -f "$filename" ]]; then
	echo "$filename" does not exists
	exit 1
fi

echo "Verifying file '$filename' with $algo in progress..."

sum=""
case "${algo,,}" in
	"md5")
		sum=$(md5sum "$filename");;
	"sha256")
		sum=$(sha256sum "$filename");;
	*)
		echo "${hash} encryption algorythm is not supported"
		exit 2
		;;
esac
sum=$(echo "$sum" | awk '{print $1}')
sum=${sum^^}

if [[ "$sum" == "$hash" ]]; then
	echo "The file's hash match the reference hash : $sum"
else
	echo "The file's hash ($sum) does not match the reference hash ($hash)"
	exit 255
fi