forked from lestrrat-go/jwx
/
serializer.go
73 lines (61 loc) · 2.1 KB
/
serializer.go
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package jwe
import (
"encoding/json"
"github.com/pkg/errors"
)
// Serialize converts the message into a JWE compact serialize format byte buffer
func (s CompactSerialize) Serialize(m *Message) ([]byte, error) {
if len(m.Recipients) != 1 {
return nil, errors.New("wrong number of recipients for compact serialization")
}
recipient := m.Recipients[0]
// The protected header must be a merge between the message-wide
// protected header AND the recipient header
hcopy := NewHeader()
// There's something wrong if m.ProtectedHeader.Header is nil, but
// it could happen
if m.ProtectedHeader == nil || m.ProtectedHeader.Header == nil {
return nil, errors.New("invalid protected header")
}
err := hcopy.Copy(m.ProtectedHeader.Header)
if err != nil {
return nil, errors.Wrap(err, "failed to copy protected header")
}
hcopy, err = hcopy.Merge(m.UnprotectedHeader)
if err != nil {
return nil, errors.Wrap(err, "failed to merge unprotected header")
}
hcopy, err = hcopy.Merge(recipient.Header)
if err != nil {
return nil, errors.Wrap(err, "failed to merge recipient header")
}
protected, err := EncodedHeader{Header: hcopy}.Base64Encode()
if err != nil {
return nil, errors.Wrap(err, "failed to encode header")
}
encryptedKey, err := recipient.EncryptedKey.Base64Encode()
if err != nil {
return nil, errors.Wrap(err, "failed to encode encryption key")
}
iv, err := m.InitializationVector.Base64Encode()
if err != nil {
return nil, errors.Wrap(err, "failed to encode iv")
}
cipher, err := m.CipherText.Base64Encode()
if err != nil {
return nil, errors.Wrap(err, "failed to encode cipher text")
}
tag, err := m.Tag.Base64Encode()
if err != nil {
return nil, errors.Wrap(err, "failed to encode tag")
}
buf := append(append(append(append(append(append(append(append(protected, '.'), encryptedKey...), '.'), iv...), '.'), cipher...), '.'), tag...)
return buf, nil
}
// Serialize converts the message into a JWE JSON serialize format byte buffer
func (s JSONSerialize) Serialize(m *Message) ([]byte, error) {
if s.Pretty {
return json.MarshalIndent(m, "", " ")
}
return json.Marshal(m)
}