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HTTPsec Authentication Protocol

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Preamble

1. Introduction

1.1. Editorial Conventions

1.2. Terms

1.3. Identifiers

2. Summary

2.1. Authentication Model

2.2. Peer Identifiers

2.3. Protocol Operation

2.3.1. Initialization

2.3.2. Continuation

3. Protocol Messages

3.1. Initialization Messages

3.1.1. Initialization Request

3.1.2. Initialization Response

3.2. Continuation Messages

3.2.1. Continuation Request

3.2.2. Continuation Response

3.3. Challenge Messages

3.3.1. Challenge Response

3.4. Message Flow

4. Protocol Directives

4.1. id

4.2. dh

4.3. certificate

4.4. url

4.5. group

4.6. nonce

4.7. auth

4.8. token

4.9. signature

4.10. count

4.11. mac

4.12. digest

5. Other Headers

5.1. Content-Encoding

5.2. Cache-Control

5.3. Expires

6. Protocol Computations

6.1. Algorithms

6.1.1. Hash Algorithm

6.1.2. Public Key Algorithm

6.1.3. Encryption Scheme

6.1.4. Signature Scheme

6.1.5. Block Cipher

6.1.6. Block Cipher Mode

6.2. Header Canonicalization

6.3. Initialization Transcript

6.4. Continuation Request Transcript

6.5. Continuation Response Transcript

6.6. Shared Secret

6.7. Keys

6.7.1. MAC Keys

6.7.2. Cipher Keys

6.8. Message Body Ciphering

7. Message Validation

7.1. Initialization Request Validation

7.2. Initialization Response Validation

7.3. Continuation Request Validation

7.4. Continuation Response Validation

8. Cache Considerations

9. Security Considerations

10. References

11. Editor Address

6.7. Keys

From the Shared Secret, both peers derive identical MAC keys and Cipher Keys. Since the Shared Secret is static throughout the lifetime of a particular shared secret arrangement, the keys may be computed once from the shared-secret by each peer and stored for the lifetime of that arrangement. The shared-secret SHOULD be discarded immediately thereafter.