MFA key derivation

[GhenadieVP]

• Define a type wrapping FactorInstance -> MFAFactorInstance. FactorInstance has everything needed, but wrap in a type to allow extensibility.
• Define a new entry in Profile in networks to store derived MFAFI.
• Define a new Sargon API something like getNewMFAPublicKey:
  • MFAFI storage is empty:
    • Derive transaction signing securified factor instance. To decide if only 1 or many like 10.
    • Store the MFAFi.
    • Return the derive public key or/and signature NonFungible GlobalId to the Wallet.
    • Wallet displays the public key or/and signature NonFungible GlobalId.
  • MFAFI storage is not empty:
    • Before deriving any new key(s) check if the currently stored keys are free by calling Gateway -> https://radix-babylon-gateway-api.redoc.ly/#operation/EntitiesByRoleRequirementLookup.
    • If there is a free public key in storage just return it.
    • Otherwise derive a new one.

Algo

1. Read MFAFI from storage
2. Check MFAFIs usage through https://radix-babylon-gateway-api.redoc.ly/#operation/EntitiesByRoleRequirementLookup.
3. If there is a MFAFI not used, return it.
4. Otherwise -> derive new MFAFIs(Derive transaction signing securified factor instance). Take of properly increment the derivation path index.
5. Store new MFAFIs in storage.
6. Repeat 2.

References

• sargon/crates/system/os/os/src/mfa/factor_instances_derivation.rs

  Line 105 in b5aa764

  let collector = KeysCollector::new(