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Encrypt your secrets with kms

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# go-secretcrypt

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Utility for keeping your secrets encrypted. Also has a [Python version](https://github.com/Zemanta/py-secretcrypt).

For example, you have the following TOML (or any format whose decoder supports TextUnmarshaler interface for custom values) configuration file

```toml
MySecret = "VerySecretValue!"
```

but you can't include that file in VCS because then your secret value would be exposed.

With **secretcrypt**, you can encrypt your secret using your AWS KMS master key aliased *MyKey*:

```bash
$ encrypt-secret kms alias/MyKey
Enter plaintext: VerySecretValue! # enter
kms:region=us-east-1:CiC/SXeuXDGRADRIjc0qcE... # shortened for brevity

# --- or --
$ echo "VerySecretValue!" | encrypt-secret kms alias/MyKey
kms:region=us-east-1:CiC/SXeuXDGRADRIjc0qcE... # shortened for brevity
# only use piping when scripting, otherwise your secrets will be stored
# in your shell's history!

```

use that secret in my TOML config file:
```toml
MySecret = "kms:region=us-east-1:CiC/SXeuXDGRADRIjc0qcE..."  # shortened for brevity
```

>  or YAML:
>  ```yaml
>  mysecret: kms:region=us-east-1:CiC/SXeuXDGRADRIjc0qcE...  # shortened for brevity
>  ```
>
>  or JSON:
>  ```json
>  {"MySecret": "kms:region=us-east-1:CiC/SXeuXDGRADRIjc0qcE..."}
>  ```

Then, you can use that secret in your config struct
```go
type Config struct {
  MySecret secretcrypt.Secret
}

var conf Config
if _, err := toml.Decode(tomlData, &conf); err != nil {
  // handle error
}
```

and get its plaintext as
```go
plaintext, err := conf.MySecret.Decrypt()
if err != nil {
  // handle error
}

```

## KMS
The KMS option uses AWS Key Management Service. When encrypting and decrypting
KMS secrets, you need to provide the AWS region used for encrypting, the default being `us-east-1`.

So if you use a custom region, you must provide it to secretcrypt:

```bash
encrypt-secret kms --region us-west-1 alias/MyKey
```

## Local encryption
This mode is meant for local and/or offline development usage.
It generates a local key in your %USER_DATA_DIR%
(see [appdirs](https://pypi.python.org/pypi/appdirs)), so that the key cannot
be accidentally committed to CVS.

It then uses that key to symmetrically encrypt and decrypt your secrets.

## Password encryption - interactive only

The password encryption mode should not be used in your application - it is
meant for easily sharing secrets among developers. It interactively prompts
the user for a password when encrypting the secret. When decrypting, it
prompts for the password again.

## Install command-line utilities
You can install command-line utilities `encrypt-secret` and `decrypt-secret` via:

```bash
go install -i github.com/outbrain/go-secretcrypt/cmd/...
```

go-secretcrypt

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