initial cognito

actual

vendor/github.com/segmentio/asm/base64/base64_default.go

@@ -0,0 +1,14 @@
+//go:build purego || !(amd64 || arm64)
+// +build purego !amd64,!arm64
+
+package base64
+
+import "encoding/base64"
+
+// An Encoding is a radix 64 encoding/decoding scheme, defined by a
+// 64-character alphabet.
+type Encoding = base64.Encoding
+
+func newEncoding(encoder string) *Encoding {
+	return base64.NewEncoding(encoder)
+}