validate_hashes.sh

#!/bin/bash

filename_extension="${1##*.}"
if [[ "$filename_extension" != "md5"  ]] && [[ "$filename_extension" != "sha1" ]] && [[ "$filename_extension" != "sha512" ]]; then
  echo "Hash algorithm not supported, choose between sha1, sha512, or md5"
  exit 1
fi

while IFS=":" read -r filename hash_code; do
  computed_hash=$(openssl dgst -"$filename_extension" "$filename" | awk '{print $2}')
  provided_hash=$(echo "$hash_code" | tr -d '[:space:]' | tr '[:upper:]' '[:lower:]')

  if [[ $computed_hash == $provided_hash ]]; then
    echo "The $filename_extension hash of $filename matches the provided hash."
  else
    echo "The $filename_extension hash of $filename does not match the provided hash. -- $computed_hash <> $provided_hash"
  fi
done <<< $(tr -d '\n' < "$1")