Vendor aws-sdk-go (dep ensure) (#178)

vendor/github.com/aws/aws-sdk-go/service/cloudfront/sign/randomreader.go

@@ -0,0 +1,30 @@
+package sign
+
+import (
+	"bytes"
+	"encoding/binary"
+	"math/rand"
+)
+
+// A randomReader wraps a math/rand.Rand within an reader so that it can used
+// as a predictable testing replacement for crypto/rand.Reader
+type randomReader struct {
+	b *bytes.Buffer
+	r *rand.Rand
+}
+
+// newRandomReader returns a new instance of the random reader
+func newRandomReader(r *rand.Rand) *randomReader {
+	return &randomReader{b: &bytes.Buffer{}, r: r}
+}
+
+// Read will read random bytes from up to the length of b.
+func (m *randomReader) Read(b []byte) (int, error) {
+	for i := 0; i < len(b); {
+		binary.Write(m.b, binary.LittleEndian, m.r.Int63())
+		n, _ := m.b.Read(b[i:])
+		i += n
+	}
+
+	return len(b), nil
+}