* HD wallet
Minimal set of changes (no refactoring) backported from Bitcoin upstream to make HD wallets work in Dash 0.12.1.x+
* minimal bip44 (hardcoded account and change)
* minimal bip39
Additional cmd-line options for new wallet:
-mnemonic
-mnemonicpassphrase
* Do not recreate HD wallet on encryption
Adjusted keypool.py test
* Do not store any private keys for hd wallet besides the master one
Derive all keys on the fly.
Original idea/implementation - btc PR9298, backported and improved
* actually use bip39
* pbkdf2 test
* backport wallet-hd.py test
* Allow specifying hd seed, add dumphdseed rpc, fix bugs
- -hdseed cmd-line param to specify HD seed on wallet creation
- dumphdseed rpc to dump HD seed
- allow seed of any size
- fix dumpwallet rpc bug (wasn't decrypting HD seed)
- print HD seed and extended public masterkey on dumpwallet
* top up keypool on HD wallet encryption
* split HD chain: external/internal
* add missing cs_wallet lock in init.cpp
* fix `const char *` issues (use strings)
* default mnemonic passphrase is an empty string in all cases
* store mnemonic/mnemonicpassphrase
replace dumphdseed with dumphdinfo
* Add fCrypted flag to CHDChain
* prepare internal structures for multiple HD accounts
(plus some code cleanup)
* use secure allocator for storing sensitive HD data
* use secure strings for mnemonic(passphrase)
* small fix in GenerateNewHDChain
* use 24 words for mnemonic by default
* make sure mnemonic passphrase provided by user does not exceed 256 symbols
* more usage of secure allocators and memory_cleanse
* code cleanup
* rename: CSecureVector -> SecureVector
* add missing include
* fix warning in rpcdump.cpp
* refactor mnemonic_check (also fix a bug)
* move bip39 functions to CMnemonic
* Few fixes for CMnemonic:
- use `SecureVector` for data, bits, seed
- `Check` should return bool
* init vectors with desired size where possible
This assertion will occur any time that the client quits without
shutting down properly due to an error condition. As the user will
report this error instead of the error that was the root cause, it is
better to remove it.
This makes it easier for us to replace it if desired, since it's now only in
one spot. Also, it avoids the openssl include from allocators.h, which
essentially forced openssl to be included from every compilation unit.
