open-vault/vendor/github.com/jackc/pgx/pgproto3/authentication.go

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2018-10-03 16:55:26 +00:00
package pgproto3
import (
"encoding/binary"
"github.com/jackc/pgx/pgio"
"github.com/pkg/errors"
)
const (
AuthTypeOk = 0
AuthTypeCleartextPassword = 3
AuthTypeMD5Password = 5
)
type Authentication struct {
Type uint32
// MD5Password fields
Salt [4]byte
}
func (*Authentication) Backend() {}
func (dst *Authentication) Decode(src []byte) error {
*dst = Authentication{Type: binary.BigEndian.Uint32(src[:4])}
switch dst.Type {
case AuthTypeOk:
case AuthTypeCleartextPassword:
case AuthTypeMD5Password:
copy(dst.Salt[:], src[4:8])
default:
return errors.Errorf("unknown authentication type: %d", dst.Type)
}
return nil
}
func (src *Authentication) Encode(dst []byte) []byte {
dst = append(dst, 'R')
sp := len(dst)
dst = pgio.AppendInt32(dst, -1)
dst = pgio.AppendUint32(dst, src.Type)
switch src.Type {
case AuthTypeMD5Password:
dst = append(dst, src.Salt[:]...)
}
pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
return dst
}