HP UX Security Products and Features Software The Validation Sequence, Public Key, DSA Signature, DSA Signature, DSA Signature, Issuer: Issuer A, Issuer: Issuer B, Subject: Issuer A, Subject: Issuer B

Common Data Security Architecture (CDSA) White Paper

Validating the CSP Credentials

Certificate 2’s public key, and so on.

Figure 1-8	Verifying a Certificate Chain
Certificate 0
Issuer: Root Issuer		Certificate 1
Subject: Root Issuer		Issuer: Root Issuer
Root Public Key		Subject: Issuer A

DSA Signature

Public Key

Certificate 2
Issuer: Issuer A	Certificate 3
Subject: Issuer B
DSA Signature	Issuer: Issuer B
Public Key
	Subject: Signer
	DSA Signature
	Public Key

The Validation Sequence

The validation process is comprised of three phases:

•Integrity check by the CSSM of the CSP shared library prior to loading

•Self-check of the CSP by itself

•Bilateral authentication check of the CSSM by the CSP

NOTE	The CSP add-in module is not used in the validation sequence. Instead,
	duplicate cryptographic functions for validating DSA signatures and
	calculating SHA-1 hashes are embedded in the integrity checking library
	of the HP CDSA Framework.

CSP shared libraries are validated in the order they are loaded by the CDSA application user.

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