105 lines
2.2 KiB
Go
105 lines
2.2 KiB
Go
package envelop
|
|
|
|
import (
|
|
"archive/zip"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
)
|
|
|
|
type Payload interface {
|
|
GetHash() []byte
|
|
GetKey() []byte
|
|
GetAlgorithm() string
|
|
GetMode() string
|
|
GetHashMethod() string
|
|
GetPayloadData() io.Reader
|
|
}
|
|
|
|
type Encryptor interface {
|
|
Encrypt(data []byte) ([]byte, error)
|
|
}
|
|
|
|
type Signer interface {
|
|
Sign(data []byte) ([]byte, error)
|
|
}
|
|
|
|
type Enveloper struct {
|
|
encryptor Encryptor
|
|
payload Payload
|
|
signer Signer
|
|
EncryptedKey []byte
|
|
Signature []byte
|
|
Metadata *Metadata
|
|
}
|
|
|
|
func (this *Enveloper) EncryptKey() ([]byte, error) {
|
|
return this.encryptor.Encrypt(this.payload.GetKey())
|
|
}
|
|
|
|
func (this *Enveloper) SignPayload() ([]byte, error) {
|
|
return this.signer.Sign(this.payload.GetHash())
|
|
}
|
|
|
|
func (this *Enveloper) CreateMetadata() *Metadata {
|
|
md := new(Metadata)
|
|
md.BlockAlgorithm = this.payload.GetAlgorithm()
|
|
md.BlockMode = this.payload.GetMode()
|
|
md.SignatureAlgorithm = "RSAPSS"
|
|
md.HashMethod = this.payload.GetHashMethod()
|
|
return md
|
|
}
|
|
|
|
func (this *Enveloper) CreateEnvelopCompletely() error {
|
|
var err error
|
|
if this.EncryptedKey, err = this.EncryptKey(); err != nil {
|
|
return err
|
|
} else if this.Signature, err = this.SignPayload(); err != nil {
|
|
return err
|
|
}
|
|
this.Metadata = this.CreateMetadata()
|
|
return nil
|
|
}
|
|
|
|
func (this *Enveloper) WritePayload(z *zip.Writer) error {
|
|
dataWriter, err := z.Create("data")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = io.Copy(dataWriter, this.payload.GetPayloadData())
|
|
return err
|
|
}
|
|
|
|
func (this *Enveloper) WriteMetadata(z *zip.Writer) error {
|
|
dataWriter, err := z.Create("metadata.json")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
encoder := json.NewEncoder(dataWriter)
|
|
return encoder.Encode(this.Metadata)
|
|
}
|
|
|
|
func (this *Enveloper) WriteEncryptedKey(z *zip.Writer) error {
|
|
dataWriter, err := z.Create("key.json")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
encoder := json.NewEncoder(dataWriter)
|
|
return encoder.Encode(&struct {
|
|
Key string
|
|
}{fmt.Sprintf("%s", this.EncryptedKey)})
|
|
}
|
|
|
|
func (this *Enveloper) WriteToWriter(w io.Writer) error {
|
|
z := zip.NewWriter(w)
|
|
defer z.Close()
|
|
if err := this.WritePayload(z); err != nil {
|
|
return err
|
|
} else if err := this.WriteMetadata(z); err != nil {
|
|
return err
|
|
} else if err := this.WriteEncryptedKey(z); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|