kms-encryption-toolbox 0.0.3

Encryption toolbox to be used with the Amazon Key Management Service for securing your deployment secrets. It encapsulates the aws-encryption-sdk package to expose cmdline actions.

# kms-encryption-toolbox
Encryption toolbox to be used with the Amazon Key Management Service for securing your deployment secrets.
It encapsulates the `aws-encryption-sdk` package to expose cmdline actions. For both `encrypt` and `decrypt` actions,
the library requests a new data key from KMS and encrypts it with the Customer Master Key. This encryption happens server-side and is performed by Amazon.

Whatever data you pass to be encrypted or decrypted, all the cryptographic computation happens on the client side, hence
your data is never sent over the wire. The `aws-encryption-sdk` guarantees embedding the data key used for sensitive data encryption
in the output stream that's being base64-encoded before returning from the `encrypt` command.

`decrypt` expects a data key to be embedded in the passed data. The data key is decrypted in KMS first (using the Customer Master Key)
and only then used to decrypt the sensitive data. As in case of `encrypt`, decryption also happens on the client side.

## pip
Package is available in the PyPI repo.

$ pip install kms-encryption-toolbox

## Usage

### Encrypt

$ kms-encryption encrypt --help

Usage: kms-encryption encrypt [OPTIONS]
Encrypts data with a new data key and returns a base64-encoded result.

Options:
--cmk-arn TEXT ARN of an existing Customer Master Key in KMS
--data TEXT Data to be encrypted. Use to pass it as a named argument.
--env TEXT Name of an environment variable that contains data to be
encrypted.
--profile TEXT Name of an AWS CLI profile to be used when contacting AWS.
--prefix TEXT An output prefix to be added to the generated result.
-h, --help Show this message and exit.

### Decrypt

$ kms-encryption decrypt --help

Usage: kms-encryption decrypt [OPTIONS]
Decrypts a base64-encoded data.

Options:
--data TEXT Data to be decrypted. Use to pass it as a named argument.
--env TEXT Name of an environment variable that contains data to be
decrypted.
--profile TEXT Name of an AWS CLI profile to be used when contacting AWS.
--prefix TEXT An input prefix to be trimmed from the beginning before a
value is decrypted.
-h, --help Show this message and exit.


## Use examples

$ export SECRET_VALUE="This is some super secret string"
$ export ENCRYPTED_VALUE=$(kms-encryption encrypt --cmk-arn arn:aws:kms:us-east-1:123456789012:key/1e1a6a81-93e0-4b9a-954b-aa1234567890 --env "SECRET_VALUE" --prefix "decrypt:")

$ echo $ENCRYPTED_VALUE
decrypt: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

$ DECRYPTED_VALUE=$(kms-encryption decrypt --env "ENCRYPTED_VALUE" --prefix "decrypt:")
$ echo $DECRYPTED_VALUE
This is some super secret string

## Additional scripts

The library also exposes two Bash scripts helpful in automated deployments:

* `decrypt-and-start.sh` - Decrypts all the environment variables that start with `decrypt:` and saves the decrypted values in the same environment variables. Then it executes the passed parameters. This script can be used as an entrypoint in a Dockerfile.
* `terraform-decrypt.sh` - a script that can be used with https://www.terraform.io/docs/providers/external/data_source.html for decrypting secrets in your Terraform infrastructure definitions.