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118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package kms
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import (
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"encoding"
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"encoding/json"
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jsoniter "github.com/json-iterator/go"
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)
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// KMS is the generic interface that abstracts over
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// different KMS implementations.
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type KMS interface {
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// Stat returns the current KMS status.
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Stat() (Status, error)
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// CreateKey creates a new key at the KMS with the given key ID.
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CreateKey(keyID string) error
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// GenerateKey generates a new data encryption key using the
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// key referenced by the key ID.
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//
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// The KMS may use a default key if the key ID is empty.
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// GenerateKey returns an error if the referenced key does
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// not exist.
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//
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// The context is associated and tied to the generated DEK.
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// The same context must be provided when the generated key
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// should be decrypted. Therefore, it is the callers
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// responsibility to remember the corresponding context for
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// a particular DEK. The context may be nil.
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GenerateKey(keyID string, context Context) (DEK, error)
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// DecryptKey decrypts the ciphertext with the key referenced
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// by the key ID. The context must match the context value
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// used to generate the ciphertext.
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DecryptKey(keyID string, ciphertext []byte, context Context) ([]byte, error)
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}
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// Status describes the current state of a KMS.
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type Status struct {
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Name string // The name of the KMS
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Endpoints []string // A set of the KMS endpoints
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// DefaultKey is the key used when no explicit key ID
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// is specified. It is empty if the KMS does not support
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// a default key.
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DefaultKey string
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}
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// DEK is a data encryption key. It consists of a
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// plaintext-ciphertext pair and the ID of the key
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// used to generate the ciphertext.
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//
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// The plaintext can be used for cryptographic
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// operations - like encrypting some data. The
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// ciphertext is the encrypted version of the
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// plaintext data and can be stored on untrusted
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// storage.
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type DEK struct {
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KeyID string
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Plaintext []byte
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Ciphertext []byte
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}
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var (
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_ encoding.TextMarshaler = (*DEK)(nil)
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_ encoding.TextUnmarshaler = (*DEK)(nil)
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)
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// MarshalText encodes the DEK's key ID and ciphertext
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// as JSON.
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func (d DEK) MarshalText() ([]byte, error) {
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type JSON struct {
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KeyID string `json:"keyid"`
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Ciphertext []byte `json:"ciphertext"`
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}
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return json.Marshal(JSON{
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KeyID: d.KeyID,
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Ciphertext: d.Ciphertext,
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})
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}
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// UnmarshalText tries to decode text as JSON representation
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// of a DEK and sets DEK's key ID and ciphertext to the
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// decoded values.
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//
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// It sets DEK's plaintext to nil.
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func (d *DEK) UnmarshalText(text []byte) error {
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type JSON struct {
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KeyID string `json:"keyid"`
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Ciphertext []byte `json:"ciphertext"`
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}
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var v JSON
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json := jsoniter.ConfigCompatibleWithStandardLibrary
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if err := json.Unmarshal(text, &v); err != nil {
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return err
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}
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d.KeyID, d.Plaintext, d.Ciphertext = v.KeyID, nil, v.Ciphertext
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return nil
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}
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