Preliminary support padding, log on panic.

This adds preliminary support for data padding by adding another layer
of encapsulation inside each AEAD frame containing a type and length.
For now, data is still sent unpadded, but the infrastructure for
supporting it is mostly there.

Additionally, use log.Panic[f]() instead of panic through out the code
so that some panics are logged.

1 files changed, 2 insertions, 2 deletions

diff --git a/utils.go b/utils.go
index ae7bc41..f8a394a 100644
--- a/utils.go
+++ b/utils.go
@@ -29,13 +29,13 @@ package obfs4
 
 import (
 	"crypto/rand"
-	"fmt"
+	"log"
 	"math/big"
 )
 
 func randRange(min, max int64) (int64, error) {
 	if max < min {
-		panic(fmt.Sprintf("randRange: min > max (%d, %d)", min, max))
+		log.Panicf("randRange: min > max (%d, %d)", min, max)
 	}
 
 	r := (max + 1) - min