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A tool for storing and retrieving encrypted data using the AWS Key Management Service

Project description

# kmstool

kmstool helps you encrypt data using the Amazon Key Management Service in AWS.

## Installing

pip install .

## Usage

kmstool has two modes: pack and unpack

### store

kmstool pack <key_id> <source>

This command takes a KMS key ID, produces a data key, and uses that key to
encrypt the file <source>. An encrypted copy of the data key is stored, along
with the encrypted files, in the current directory.

### retrieve

kmstool retrieve <source>

This command reads the contents of <source> passing the encrypted data key to
KMS, and using the resulting plaintext key to decrypt the original data. The
files are extracted to the current directory.

### Additional Options

Additional options are available: see `kmstool -h` for usage information.

Unless otherwise specified, AWS credentials are determined by first examining
the environment, then a search of the AWS metadata service, and finally using
the "default" botocore profile.

AWS (botocore) profile to use when contacting the KMS.
AWS region to connect to for KMS.

An optional encryption context may be passed when storing files. The same
context must be passed when retrieving them.

-c --encryption-context foo=bar,baz=qux

## Internals

The output of `kmstool pack` is a gzipped GNU tar file containing the
KMS-encrypted data key plus an encrypted tar.gz of the source data. The
encrypted data is stored as follows (numbers are byte offsets).

0-15 Initialization Vector
16-N Encrypted data:
0-15 Original filesize
16-N Original data

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