Implement Hashing and signing for log

[acn-dgopa]

Description

Hashing of a selected set of properties together with signing the hash reduces the chance that logs have been tampered with.
https://learn.microsoft.com/en-us/dotnet/standard/security/cryptographic-signatures

Use SHA384 to Hash values.

Use RSA to sign HASH.

Do we need to support rotation of certificates. How should we know which certificates to

###Analysis

• Analyze and find out what are the list of values that need to be included in Hash.

Tasks

• Implement Hashing service
• Add hash, signature and reference to certificate/key fields in database
• Update function to store the new fields in database

Acceptance Criteria

• Hashing is implemented