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// Copyright 2017-2018 int08h LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//!
//! Representations and management of Roughtime's online and long-term Ed25519 keys
//!
extern crate hex;
extern crate log;
extern crate ring;
extern crate std;
mod envelope;
mod longterm;
mod online;
use std::error::Error;
pub use self::envelope::EnvelopeEncryption;
pub use self::longterm::LongTermKey;
pub use self::online::OnlineKey;
#[cfg(feature = "kms")]
pub mod awskms;
#[derive(Debug, PartialEq, Eq, PartialOrd, Hash, Clone, Copy)]
pub enum KeyProtection {
/// No protection, seed is in plaintext
Plaintext,
/// Envelope encryption with Key-Encrypting-Key (KEK) from AWS Key Management Service
AwsKmsEnvelope,
/// Envelope encryption with Key-Encrypting-Key (KEK) from Google Cloud Key Management Service
GoogleKmsEnvelope,
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Hash, Clone)]
pub enum KmsError {
OperationFailed(String),
InvalidConfiguration(String),
InvalidData(String),
InvalidKey(String),
}
impl From<std::io::Error> for KmsError {
fn from(error: std::io::Error) -> Self {
KmsError::OperationFailed(error.description().to_string())
}
}
impl From<ring::error::Unspecified> for KmsError {
fn from(error: ring::error::Unspecified) -> Self {
KmsError::OperationFailed("unspecified ring cryptographic failure".to_string())
}
}
/// Size of the Data Encryption Key (DEK) in bytes
pub const DEK_SIZE_BYTES: usize = 32;
/// Size of the AEAD nonce in bytes
pub const NONCE_SIZE_BYTES: usize = 12;
/// Size of the AEAD authentication tag in bytes
pub const TAG_SIZE_BYTES: usize = 16;
/// An unencrypted (plaintext) 256-bit Data Encryption Key (DEK).
type PlaintextDEK = Vec<u8>;
/// A Data Encryption Key (DEK) that has been encrypted (wrapped) by a Key Encryption Key (KEK).
/// Size of the encrypted DEK is implementation specific (things like AEAD tag size, nonce size,
/// provider metadata, and so on will cause it to vary).
type EncryptedDEK = Vec<u8>;
pub trait KmsProvider {
fn encrypt_dek(&self, plaintext_dek: &PlaintextDEK) -> Result<EncryptedDEK, KmsError>;
fn decrypt_dek(&self, encrypted_dek: &EncryptedDEK) -> Result<PlaintextDEK, KmsError>;
}
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