[WIP] ABW-1674: Import export profile as file with encryption

[CyonAlexRDX]

Jira ticket: ABW-1674

All exported files are JSON files, if profile snapshot is plaintext, it is just the JSON encoding of the snapshot saved as a .json file, if encryption is used then this json file is saved:

{
   "version": 1,
    "encryptionScheme":
    {
        "version": 1,
        "description": "AESGCM-256"
    },
    "encryptedSnapshot": "deadbeef.....",
    "keyDerivationScheme":
    {
        "version": 1,
        "description": "HKDFSHA256-with-UTF8-encoding-of-password-no-salt-no-info"
    }
}

The Swift model looks like this:

public struct EncryptedProfileSnapshot: Codable {
        public let version: Version

	/// Encrypted JSON encoding of a `ProfileSnapshot`
	public let encryptedSnapshot: HexCodable

	/// The KDF algorithm which was used to derive the encryption key from the user provided password.
	public let keyDerivationScheme: KeyDerivationScheme

	/// The encryption algorithm which was used to produce `encryptedSnapshot` with the encryption key
	/// derived using the `keyDerivationScheme`.
	public let encryptionScheme: EncryptionScheme
}

We are versioning KDF and encryption!! And that has been encapsulated in full by the types KeyDerivationScheme and EncryptionScheme, which when coded contains a version and a description property. Only version is used during decryption, but the description is useful nonetheless.

N.B.
The KDF and encryption used for profile snapshot is/will NOT be the same for SecurityQuestionsFactorSource!!! Which will use a much more complicated scheme (which should also be versioned...).

Example

Here follows to examples of file based manually exported profiles, one encrypted and one plaintext. Both are identical (once the encrypted have been decrypted...). Below is the mnemonics for them:

Mnemonics

• Main mnemonic:

glimpse excite strike buyer error toss sleep oil menu more define album oyster target imitate possible vanish muffin current stove bench increase asset depart

• Olympia 12 word mnemonic:

gentle hawk winner rain embrace erosion call update photo frost fatal wrestle

• Olympia 18 word mnemonic:

smile entry satisfy shed margin rubber disorder hungry foot error ribbon cradle aim round october blind lab spend

Encrypted

The encryption password is

apabanan

File

(apparently I cannot upload JSON files to Github - wtf... so uploading them to Slack)
See encrypted file here on Slack

Plaintext

(apparently I cannot upload JSON files to Github - wtf... so uploading them to Slack)

See plaintext Profile file here on Slack

Pro-Tip: For DEBUG build under Advanced Mode in Import Mnemonic screen you can copy paste the mnemoncs...

Video

Updated video/demo from Wednesday 23rd of August: https://rdxworks.slack.com/archives/C031A0V1A1W/p1692798080432219

PR submission checklist

• I have tested account to account transfer flow and have confirmed that it works

[kugel3]

You should be able to use the newer version of SwitchStore, where you get a reference to state in the closure, and you can switch on that. Still need to use CaseLet in the cases, but it still forces exhaustivity.

[CyonAlexRDX]

nice! I migrated ALL SwitchStores to this, see: 59c1a4a
@GhenadieVP ping ^^

[kugel3]

Great work. Should probably test the Relayed one, I don't fully trust the Relay magic.

[CyonAlexRDX]

Tested all relayed ( TransferAccountList and DappInteractionFlow) and they worked.

[kugel3]

A work of art, only style comments.

[kugel3]

Extra space