forked from FactomProject/factomd
/
encryptedMarshaler.go
95 lines (75 loc) · 1.95 KB
/
encryptedMarshaler.go
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package securedb
import (
"fmt"
"os"
"github.com/FactomProject/factomd/common/interfaces"
llog "github.com/FactomProject/factomd/log"
)
type EncryptedMarshaler struct {
EncryptionKey []byte
Original interfaces.BinaryMarshallable
}
func NewEncryptedMarshaler(key []byte, o interfaces.BinaryMarshallable) *EncryptedMarshaler {
e := new(EncryptedMarshaler)
e.EncryptionKey = key
e.Original = o
return e
}
func (e *EncryptedMarshaler) New() interfaces.BinaryMarshallableAndCopyable {
e2 := NewEncryptedMarshaler(e.EncryptionKey, nil)
c, ok := e.Original.(interfaces.BinaryMarshallableAndCopyable)
if !ok {
return e2
}
e2.Original = c.New()
return e2
}
func (e *EncryptedMarshaler) UnmarshalBinary(cipherData []byte) (err error) {
_, err = e.UnmarshalBinaryData(cipherData)
return
}
func (e *EncryptedMarshaler) UnmarshalBinaryData(cipherData []byte) (newData []byte, err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("Error unmarshalling: %v", r)
llog.LogPrintf("recovery", "Error unmarshalling: %v", r)
}
}()
if e.Original == nil {
return nil, fmt.Errorf("No object given")
}
l, err := bytesToUint32(cipherData[:4])
if err != nil {
return nil, err
}
newData = cipherData[l+4:]
plainData, err := Decrypt(cipherData[4:l+4], e.EncryptionKey)
if err != nil {
return nil, err
}
_, err = e.Original.UnmarshalBinaryData(plainData)
if err != nil {
return nil, err
}
return newData, nil
}
func (e *EncryptedMarshaler) MarshalBinary() (rval []byte, err error) {
defer func(pe *error) {
if *pe != nil {
fmt.Fprintf(os.Stderr, "EncryptedMarshaler.MarshalBinary err:%v", *pe)
}
}(&err)
if e.Original == nil {
return nil, fmt.Errorf("No object given")
}
plainData, err := e.Original.MarshalBinary()
if err != nil {
return nil, err
}
cipherData, err := Encrypt(plainData, e.EncryptionKey)
if err != nil {
return nil, err
}
l := intToBytes(len(cipherData))
return append(l, cipherData...), nil
}