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Encrypt/decrypt files using AWS KMS
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#!/usr/bin/env bash | |
# License: MIT - https://opensource.org/licenses/MIT | |
# | |
# Usage: | |
# | |
# Encrypt a file: | |
# kms-vault encrypt My-Key-Alias some-file-i-want-encrypted.txt > topsecret.asc | |
# | |
# Decrypt a file: | |
# kms-vault decrypt topsecret.asc | |
# | |
# | |
# Requirements: AWS CLI, jq | |
# | |
# Your AWS profile / default profile needs to have access to the KMS key you want to use | |
# and the kms:ListAliases permission. | |
# | |
set -eu -o pipefail | |
command=$1 | |
if [[ $command = "encrypt" ]]; then | |
key_alias="$2" | |
key_info=$(aws kms list-aliases | jq -r ".Aliases[] | select(.AliasName | contains (\"$key_alias\"))") | |
echo "Using key:" 1>&2 | |
echo "$key_info" | jq 1>&2 | |
key_id=$(echo "$key_info" | jq -r .TargetKeyId) | |
plaintext_path="$3" | |
aws kms encrypt --key-id "$key_id" --plaintext "fileb://$plaintext_path" --query CiphertextBlob --output text | |
exit 0 | |
elif [[ $command = "decrypt" ]]; then | |
ciphertext_path="$2" | |
aws kms decrypt --ciphertext-blob fileb://<(cat $ciphertext_path | base64 --decode) --output text --query Plaintext | base64 --decode | |
exit 0 | |
else | |
echo "Unknown command: $command" | |
exit 1 | |
fi |
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