feat: initial implementation

rand.go

@@ -0,0 +1,28 @@
+package gomockctx
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
+	"abcdefghijklmnopqrstuvwxyz" +
+	"0123456789"
+
+// randString returns a cryptographically secure random string of alphanumeric
+// characters of n length.
+//
+// Borrowed from github.com/jimeh/rands package.
+func randString(n int) (string, error) {
+	l := big.NewInt(int64(len(alphabet)))
+	b := make([]byte, n)
+	for i := 0; i < n; i++ {
+		index, err := rand.Int(rand.Reader, l)
+		if err != nil {
+			return "", err
+		}
+		b[i] = alphabet[index.Int64()]
+	}
+
+	return string(b), nil
+}