Network Working Group T. Dierks
Request for Comments: 2246 Certicom
Category: Standards Track C. Allen
Certicom
January 1999
The TLS Protocol
Version 1.0
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (1999). All Rights Reserved.
Abstract
This document specifies Version 1.0 of the Transport Layer Security
(TLS) protocol. The TLS protocol provides communications privacy over
the Internet. The protocol allows client/server applications to
communicate in a way that is designed to prevent eavesdropping,
tampering, or message forgery.
Table of Contents
1. Introduction 3
2. Goals 4
3. Goals of this document 5
4. Presentation language 5
4.1. Basic block size 6
4.2. Miscellaneous 6
4.3. Vectors 6
4.4. Numbers 7
4.5. Enumerateds 7
4.6. Constructed types 8
4.6.1. Variants 9
4.7. Cryptographic attributes 10
4.8. Constants 11
5. HMAC and the pseudorandom function 11
6. The TLS Record Protocol 13
6.1. Connection states 14
Dierks & Allen Standards Track [Page 1]RFC 2246 The TLS Protocol Version 1.0 January 1999
6.2. Record layer 16
6.2.1. Fragmentation 16
6.2.2. Record compression and decompression 17
6.2.3. Record payload protection 18
6.2.3.1. Null or standard stream cipher 19
6.2.3.2. CBC block cipher 19
6.3. Key calculation 21
6.3.1. Export key generation example 22
7. The TLS Handshake Protocol 23
7.1. Change cipher spec protocol 24
7.2. Alert protocol 24
7.2.1. Closure alerts 25
7.2.2. Error alerts 26
7.3. Handshake Protocol overview 29
7.4. Handshake protocol 32
7.4.1. Hello messages 33
7.4.1.1. Hello request 33
7.4.1.2. Client hello 34
7.4.1.3. Server hello 36
7.4.2. Server certificate 37
7.4.3. Server key exchange message 39
7.4.4. Certificate request 41
7.4.5. Server hello done 42
7.4.6. Client certificate 43
7.4.7. Client key exchange message 43
7.4.7.1. RSA encrypted premaster secret message 44
7.4.7.2. Client Diffie-Hellman public value 45
7.4.8. Certificate verify 45
7.4.9. Finished 46
8. Cryptographic computations 47
8.1. Computing the master secret 47
8.1.1. RSA 48
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