HD Wallet for solana - assumptions

[matevszm]

• The use of BIP32 with ED25519 is secure and does not introduce any security vulnerabilities.
• The implementation of BIP32 for ED25519 in the library https://github.com/jpopesculian/ed25519-dalek-bip32 is correct and free from logical or safety issues.
• Key derivation for ED25519 is deterministic.
• We are using an older version of https://github.com/jpopesculian/ed25519-dalek-bip32 (0.2.0) due to a version conflict with the ED25519 package.
• Name bip39_secp_priv_key in enum for the new PrivKeyPolicy related to ED25519 in the pull request is ambiguous named, so we change it to xprv_key.

  pub enum Ed25519PrivKeyPolicy<T> { 
  Iguana(T), 
  HDWallet { 
      path_to_coin: HDPathToCoin, 
      activated_key: T, 
      bip39_secp_priv_key: ExtendedSecretKey, 
  }, 
  Trezor, 
  }

• We need to add solana native to coins config.

[coredumped7893]

alternative considered library: https://github.com/typed-io/rust-ed25519-bip32 cc: @matevszm