Internet Engineering Task Force (IETF) R. Denis-Courmont
Request for Comments: 5769 Nokia
Category: Informational April 2010
Test Vectors for Session Traversal Utilities for NAT (STUN)
The Session Traversal Utilities for NAT (STUN) protocol defines
several STUN attributes. The content of some of these --
FINGERPRINT, MESSAGE-INTEGRITY, and XOR-MAPPED-ADDRESS -- involve
binary-logical operations (hashing, xor). This document provides
test vectors for those attributes.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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Standard; see Section 2 of RFC 5741.
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The Session Traversal Utilities for NAT (STUN)[RFC5389] protocol
defines two different hashes that may be included in messages
exchanged by peers implementing that protocol:
FINGERPRINT attribute: a 32-bit Cyclic Redundancy Check.
MESSAGE-INTEGRITY attribute: an HMAC-SHA1 [RFC2104] authentication
This document provides samples of properly formatted STUN messages
including these hashes, for the sake of testing implementations of
the STUN protocol.
2. Test Vectors
All included vectors are represented as a series of hexadecimal
values in network byte order. Each pair of hexadecimal digits
represents one byte.
Messages follow the Interactive Connectivity Establishment (ICE)
Connectivity Checks use case of STUN (see [RFC5245]). These messages
include FINGERPRINT, MESSAGE-INTEGRITY, and XOR-MAPPED-ADDRESS STUN
attributes. These attributes are considered to be most prone to
implementation errors. An additional message is provided to test
STUN authentication with long-term credentials (which is not used by
In the following sample messages, two types of plain UTF-8 text
attributes are included. The values of certain of these attributes
were purposely sized to require padding. Non-ASCII characters are
represented as <U+xxxx> where xxxx is the hexadecimal number of their
Unicode code point.
In this document, ASCII white spaces (U+0020) are used for padding
within the first three messages - this is arbitrary. Similarly, the
last message uses nul bytes for padding. As per [RFC5389], padding
bytes may take any value.