murmuration

encryption primitives for use with aws kms

aes + galois counter mode encryption

from murmuration import gcm
key = 'this is my secret encryption key'
plaintext = 'the quick brown fox jumps over the lazy dog'
ciphertext = gcm.encrypt(plaintext, key, 'header')
decrypted = gcm.decrypt(ciphertext, key)
assert decrypted == plaintext

encryption using kms (for use with aws)

You can also use kms as an encryption / decryption service. This does incur kms costs and require kms setup. The region and profile parameters do not have to be specified. If they are not specified, the values will be inferred in the order specified by boto3:

1. Passing credentials as parameters in the boto.client() method
2. Passing credentials as parameters when creating a Session object
3. Environment variables
4. Shared credential file (~/.aws/credentials)
5. AWS config file (~/.aws/config)
6. Assume Role provider
7. Boto2 config file (/etc/boto.cfg and ~/.boto)
8. Instance metadata service on an Amazon EC2 instance that has an IAM role configured.

from murmuration import kms
plaintext = 'the quick brown fox jumps over the lazy dog'
key_alias = 'my kms key alias'
ciphertext = kms.encrypt(plaintext, key_alias, region='us-west-1', profile='company')
decrypted = kms.decrypt(ciphertext, region='us-west-1', profile='company')
assert decrypted == plaintext

wrapped encryption using kms (for use with aws)

You can also use wrapped kms data keys for encryption to protect the underlying kms key. Using this does functionality will incur kms costs and require kms setup. The region and profile parameters do not have to be specified.
If they are not specified, the values will be inferred in the order specified by boto3:

1. Passing credentials as parameters in the boto.client() method
2. Passing credentials as parameters when creating a Session object
3. Environment variables
4. Shared credential file (~/.aws/credentials)
5. AWS config file (~/.aws/config)
6. Assume Role provider
7. Boto2 config file (/etc/boto.cfg and ~/.boto)
8. Instance metadata service on an Amazon EC2 instance that has an IAM role configured.

from murmuration import kms_wrapped
plaintext = 'the quick brown fox jumps over the lazy dog'
key_alias = 'my kms key alias'
ciphertext = kms_wrapped.encrypt(plaintext, key_alias, region='us-west-1', profile='company')
decrypted = kms_wrapped.decrypt(ciphertext, region='us-west-1', profile='company')
assert decrypted == plaintext

contributing quick start

cd /path/to
git clone https://github.com/angry-penguins/murmuration
cd murmuration
make setup

to run tests, you will need to create a config file called conf/test.yml

aws:
  profile: an_existing_aws_profile

this profile will need to have a kms key that has been aliased to dev.

Once you have created that file, you can run tests using make:

make test