1 files changed, 30 insertions, 0 deletions
diff --git a/vendor/mellium.im/sasl/nonce.go b/vendor/mellium.im/sasl/nonce.go
new file mode 100644
index 000000000..8e8666fd2
--- /dev/null
+++ b/vendor/mellium.im/sasl/nonce.go
@@ -0,0 +1,30 @@
+// Copyright 2016 The Mellium Contributors.
+// Use of this source code is governed by the BSD 2-clause license that can be
+// found in the LICENSE file.
+
+package sasl
+
+import (
+	"encoding/base64"
+	"io"
+)
+
+// Generates a nonce with n random bytes base64 encoded to ensure that it meets
+// the criteria for inclusion in a SCRAM message.
+func nonce(n int, r io.Reader) []byte {
+	if n < 1 {
+		panic("Cannot generate zero or negative length nonce")
+	}
+	b := make([]byte, n)
+	n2, err := r.Read(b)
+	switch {
+	case err != nil:
+		panic(err)
+	case n2 != n:
+		panic("Could not read enough randomness to generate nonce")
+	}
+	val := make([]byte, base64.RawStdEncoding.EncodedLen(n))
+	base64.RawStdEncoding.Encode(val, b)
+
+	return val
+}