| // Copyright 2017 Google Inc. |
| // |
| // 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. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| // Package gcpkms provides integration with the GCP Cloud KMS. |
| package gcpkms |
| |
| import ( |
| "encoding/base64" |
| |
| "google.golang.org/api/cloudkms/v1" |
| |
| "github.com/google/tink/go/tink" |
| ) |
| |
| // GCPAEAD represents a GCP KMS service to a particular URI. |
| type GCPAEAD struct { |
| keyURI string |
| kms cloudkms.Service |
| } |
| |
| var _ tink.AEAD = (*GCPAEAD)(nil) |
| |
| // NewGCPAEAD returns a new GCP KMS service. |
| func NewGCPAEAD(keyURI string, kms *cloudkms.Service) *GCPAEAD { |
| return &GCPAEAD{ |
| keyURI: keyURI, |
| kms: *kms, |
| } |
| } |
| |
| // Encrypt AEAD encrypts the plaintext data and uses addtionaldata from authentication. |
| func (a *GCPAEAD) Encrypt(plaintext, additionalData []byte) ([]byte, error) { |
| |
| req := &cloudkms.EncryptRequest{ |
| Plaintext: base64.StdEncoding.EncodeToString(plaintext), |
| AdditionalAuthenticatedData: base64.StdEncoding.EncodeToString(additionalData), |
| } |
| resp, err := a.kms.Projects.Locations.KeyRings.CryptoKeys.Encrypt(a.keyURI, req).Do() |
| if err != nil { |
| return nil, err |
| } |
| |
| return base64.StdEncoding.DecodeString(resp.Ciphertext) |
| } |
| |
| // Decrypt AEAD decrypts the data and verified the additional data. |
| func (a *GCPAEAD) Decrypt(ciphertext, additionalData []byte) ([]byte, error) { |
| |
| req := &cloudkms.DecryptRequest{ |
| Ciphertext: base64.StdEncoding.EncodeToString(ciphertext), |
| AdditionalAuthenticatedData: base64.StdEncoding.EncodeToString(additionalData), |
| } |
| resp, err := a.kms.Projects.Locations.KeyRings.CryptoKeys.Decrypt(a.keyURI, req).Do() |
| if err != nil { |
| return nil, err |
| } |
| return base64.StdEncoding.DecodeString(resp.Plaintext) |
| } |