rpc: Implement z_exportviewingkey for Sapling#461
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@nullcopy Please help take a look when you have time. Integration tests can be found here: zcash/integration-tests#115 |
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Implements z_exportviewingkey, which returns the bech32-encoded Sapling extended full viewing key for a
given Sapling payment address. This is the export counterpart needed to support z_importviewingkey (PR
#431) and its integration test (zcash/integration-tests#99).
The address lookup scans each account's UFVK Sapling component via
decrypt_diversifier, since bare Saplingreceivers derived from unified accounts aren't found by the standard
get_account_for_addresspath. Walletunlock is required for seed access to re-derive the EFVK. Imported view-only accounts are rejected (the
stored
DiversifiableFullViewingKeycan't reconstruct the chain-code-bearingExtendedFullViewingKey).Integration tests can be found here: zcash/integration-tests#115
Closes #70
Closes COR-255