added base62

langext/rand.go

@@ -3,8 +3,6 @@ package langext
 import (
 	"crypto/rand"
 	"io"
-	"math"
-	"math/big"
 )
 
 func RandBytes(size int) []byte {
@@ -15,24 +13,3 @@ func RandBytes(size int) []byte {
 	}
 	return b
 }
-
-func RandBase62(rlen int) string {
-	ecs := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
-
-	bi52 := big.NewInt(int64(len(ecs)))
-
-	randMax := big.NewInt(math.MaxInt64)
-
-	r := ""
-
-	for i := 0; i < rlen; i++ {
-		v, err := rand.Int(rand.Reader, randMax)
-		if err != nil {
-			panic(err)
-		}
-
-		r += string(ecs[v.Mod(v, bi52).Int64()])
-	}
-
-	return r
-}