"crypto/rand"
"io"
"net"
-)
-var (
- Rand = rand.Reader
+ "github.com/Sirupsen/logrus"
+ "github.com/pkg/errors"
)
+// Rand is a source of entropy
+var Rand = rand.Reader
+
+// EGDRand is a EGD (Entropy Gathering Daemon) source of entropy
type EGDRand string
// Read n bytes from EGD, blocking mode.
func (egdPath EGDRand) Read(b []byte) (int, error) {
conn, err := net.Dial("unix", string(egdPath))
if err != nil {
- return 0, err
+ return 0, errors.Wrapf(err, "net.Dial unix:%q", string(egdPath))
+ }
+ defer CloseLog(conn, logger, logrus.Fields{"func": logFuncPrefix + "EGDRand.Read"})
+ n, err := conn.Write([]byte{0x02, byte(len(b))})
+ if err != nil {
+ return 0, errors.Wrapf(err, "conn.Write unix:%q", string(egdPath))
+ }
+ if n, err = io.ReadFull(conn, b); err != nil {
+ return 0, errors.Wrapf(err, wrapIoReadFull, string(egdPath))
}
- defer conn.Close()
- conn.Write([]byte{0x02, byte(len(b))})
- return io.ReadFull(conn, b)
+ return n, nil
}
+// EGDInit sets random source to a EGD socket
func EGDInit(path string) {
Rand = EGDRand(path)
}