zcash_keys: Remove HdSeedFingerprint as it duplicates zip32::fingerprint::SeedFingerprint'

Cargo.toml

@@ -114,7 +114,7 @@ rand_xorshift = "0.3"
 # ZIP 32
 aes = "0.8"
 fpe = "0.6"
-zip32 = "0.1"
+zip32 = "0.1.1"
 
 [profile.release]
 lto = true

zcash_client_backend/src/data_api.rs

@@ -66,7 +66,7 @@ use std::{
 use incrementalmerkletree::{frontier::Frontier, Retention};
 use secrecy::SecretVec;
 use shardtree::{error::ShardTreeError, store::ShardStore, ShardTree};
-use zcash_keys::keys::HdSeedFingerprint;
+use zip32::fingerprint::SeedFingerprint;
 
 use self::{
     chain::{ChainState, CommitmentTreeRoot},
@@ -320,7 +320,7 @@ impl AccountBalance {
 pub enum AccountKind {
     /// An account derived from a known seed.
     Derived {
-        seed_fingerprint: HdSeedFingerprint,
+        seed_fingerprint: SeedFingerprint,
         account_index: zip32::AccountId,
     },
 
@@ -698,11 +698,11 @@ pub trait WalletRead {
         account_id: Self::AccountId,
     ) -> Result<Option<Self::Account>, Self::Error>;
 
-    /// Returns the account corresponding to a given [`HdSeedFingerprint`] and
+    /// Returns the account corresponding to a given [`SeedFingerprint`] and
     /// [`zip32::AccountId`], if any.
     fn get_derived_account(
         &self,
-        seed: &HdSeedFingerprint,
+        seed: &SeedFingerprint,
         account_id: zip32::AccountId,
     ) -> Result<Option<Self::Account>, Self::Error>;
 
@@ -1586,7 +1586,7 @@ pub mod testing {
     use secrecy::{ExposeSecret, SecretVec};
     use shardtree::{error::ShardTreeError, store::memory::MemoryShardStore, ShardTree};
     use std::{collections::HashMap, convert::Infallible, num::NonZeroU32};
-    use zcash_keys::keys::HdSeedFingerprint;
+    use zip32::fingerprint::SeedFingerprint;
 
     use zcash_primitives::{
         block::BlockHash,
@@ -1686,7 +1686,7 @@ pub mod testing {
 
         fn get_derived_account(
             &self,
-            _seed: &HdSeedFingerprint,
+            _seed: &SeedFingerprint,
             _account_id: zip32::AccountId,
         ) -> Result<Option<Self::Account>, Self::Error> {
             Ok(None)

zcash_client_sqlite/src/lib.rs

@@ -45,14 +45,14 @@
     path::Path,
 };
 use subtle::ConditionallySelectable;
-use zcash_keys::keys::HdSeedFingerprint;
 use zcash_primitives::{
     block::BlockHash,
     consensus::{self, BlockHeight},
     memo::{Memo, MemoBytes},
     transaction::{components::amount::NonNegativeAmount, Transaction, TxId},
     zip32::{self, DiversifierIndex, Scope},
 };
+use zip32::fingerprint::SeedFingerprint;
 
 use zcash_client_backend::{
     address::UnifiedAddress,
@@ -304,7 +304,7 @@
 
     fn get_derived_account(
         &self,
-        seed: &HdSeedFingerprint,
+        seed: &SeedFingerprint,
         account_id: zip32::AccountId,
     ) -> Result<Option<Self::Account>, Self::Error> {
         wallet::get_derived_account(self.conn.borrow(), &self.params, seed, account_id)
@@ -321,7 +321,12 @@
                 account_index,
             } = account.kind()
             {
-                let seed_fingerprint_match = HdSeedFingerprint::from_seed(seed) == seed_fingerprint;
+                let seed_fingerprint_match =
+                    SeedFingerprint::from_seed(seed.expose_secret()).ok_or_else(|| {
+                        SqliteClientError::BadAccountData(
+                            "Seed must be between 32 and 252 bytes in length.".to_owned(),
+                        )
+                    })? == seed_fingerprint;
 
                 let usk = UnifiedSpendingKey::from_seed(
                     &self.params,
@@ -502,7 +507,12 @@
         birthday: AccountBirthday,
     ) -> Result<(AccountId, UnifiedSpendingKey), Self::Error> {
         self.transactionally(|wdb| {
-            let seed_fingerprint = HdSeedFingerprint::from_seed(seed);
+            let seed_fingerprint =
+                SeedFingerprint::from_seed(seed.expose_secret()).ok_or_else(|| {
+                    SqliteClientError::BadAccountData(
+                        "Seed must be between 32 and 252 bytes in length.".to_owned(),
+                    )
+                })?;
             let account_index = wallet::max_zip32_account_index(wdb.conn.0, &seed_fingerprint)?
                 .map(|a| a.next().ok_or(SqliteClientError::AccountIdOutOfRange))
                 .transpose()?

zcash_client_sqlite/src/wallet.rs

@@ -67,6 +67,7 @@
 use incrementalmerkletree::Retention;
 use rusqlite::{self, named_params, params, OptionalExtension};
 use shardtree::{error::ShardTreeError, store::ShardStore, ShardTree};
+use zip32::fingerprint::SeedFingerprint;
 
 use std::collections::HashMap;
 use std::convert::TryFrom;
@@ -75,7 +76,7 @@
 use std::ops::RangeInclusive;
 use tracing::debug;
 use zcash_address::unified::{Encoding, Ivk, Uivk};
-use zcash_keys::keys::{AddressGenerationError, HdSeedFingerprint, UnifiedAddressRequest};
+use zcash_keys::keys::{AddressGenerationError, UnifiedAddressRequest};
 
 use zcash_client_backend::{
     address::{Address, UnifiedAddress},
@@ -145,7 +146,7 @@
 ) -> Result<AccountKind, SqliteClientError> {
     match (account_kind, hd_seed_fingerprint, hd_account_index) {
         (0, Some(seed_fp), Some(account_index)) => Ok(AccountKind::Derived {
-            seed_fingerprint: HdSeedFingerprint::from_bytes(seed_fp),
+            seed_fingerprint: SeedFingerprint::from_bytes(seed_fp),
             account_index: zip32::AccountId::try_from(account_index).map_err(|_| {
                 SqliteClientError::CorruptedData(
                     "ZIP-32 account ID from wallet DB is out of range.".to_string(),
@@ -280,11 +281,11 @@
 // Returns the highest used account index for a given seed.
 pub(crate) fn max_zip32_account_index(
     conn: &rusqlite::Connection,
-    seed_id: &HdSeedFingerprint,
+    seed_id: &SeedFingerprint,
 ) -> Result<Option<zip32::AccountId>, SqliteClientError> {
     conn.query_row_and_then(
         "SELECT MAX(hd_account_index) FROM accounts WHERE hd_seed_fingerprint = :hd_seed",
-        [seed_id.as_bytes()],
+        [seed_id.to_bytes()],
         |row| {
             let account_id: Option<u32> = row.get(0)?;
             account_id
@@ -366,7 +367,7 @@
         "#,
         named_params![
             ":account_kind": account_kind_code(kind),
-            ":hd_seed_fingerprint": hd_seed_fingerprint.as_ref().map(|fp| fp.as_bytes()),
+            ":hd_seed_fingerprint": hd_seed_fingerprint.as_ref().map(|fp| fp.to_bytes()),
             ":hd_account_index": hd_account_index.map(u32::from),
             ":ufvk": viewing_key.ufvk().map(|ufvk| ufvk.encode(params)),
             ":uivk": viewing_key.uivk_str(params)?,
@@ -765,12 +766,12 @@
     }
 }
 
-/// Returns the account id corresponding to a given [`HdSeedFingerprint`]
+/// Returns the account id corresponding to a given [`SeedFingerprint`]
 /// and [`zip32::AccountId`], if any.
 pub(crate) fn get_derived_account<P: consensus::Parameters>(
     conn: &rusqlite::Connection,
     params: &P,
-    seed: &HdSeedFingerprint,
+    seed: &SeedFingerprint,
     account_index: zip32::AccountId,
 ) -> Result<Option<Account>, SqliteClientError> {
     let mut stmt = conn.prepare(
@@ -782,7 +783,7 @@
 
     let mut accounts = stmt.query_and_then::<_, SqliteClientError, _, _>(
         named_params![
-            ":hd_seed_fingerprint": seed.as_bytes(),
+            ":hd_seed_fingerprint": seed.to_bytes(),
             ":hd_account_index": u32::from(account_index),
         ],
         |row| {

zcash_client_sqlite/src/wallet/init/migrations/full_account_ids.rs

@@ -6,8 +6,9 @@ use schemer_rusqlite::RusqliteMigration;
 use secrecy::{ExposeSecret, SecretVec};
 use uuid::Uuid;
 use zcash_client_backend::{data_api::AccountKind, keys::UnifiedSpendingKey};
-use zcash_keys::keys::{HdSeedFingerprint, UnifiedFullViewingKey};
+use zcash_keys::keys::UnifiedFullViewingKey;
 use zcash_primitives::consensus;
+use zip32::fingerprint::SeedFingerprint;
 
 use super::{add_account_birthdays, receiving_key_scopes, v_transactions_note_uniqueness};
 
@@ -45,7 +46,7 @@ impl<P: consensus::Parameters> RusqliteMigration for Migration<P> {
 
     fn up(&self, transaction: &Transaction) -> Result<(), WalletMigrationError> {
         let account_kind_derived = account_kind_code(AccountKind::Derived {
-            seed_fingerprint: HdSeedFingerprint::from_bytes([0; 32]),
+            seed_fingerprint: SeedFingerprint::from_bytes([0; 32]),
             account_index: zip32::AccountId::ZERO,
         });
         let account_kind_imported = account_kind_code(AccountKind::Imported);
@@ -83,7 +84,8 @@ impl<P: consensus::Parameters> RusqliteMigration for Migration<P> {
             Ok(row.get::<_, u32>(0)? > 0)
         })? {
             if let Some(seed) = &self.seed.as_ref() {
-                let seed_id = HdSeedFingerprint::from_seed(seed);
+                let seed_id = SeedFingerprint::from_seed(seed.expose_secret())
+                    .expect("Seed is between 32 and 252 bytes in length.");
                 let mut q = transaction.prepare("SELECT * FROM accounts")?;
                 let mut rows = q.query([])?;
                 while let Some(row) = rows.next()? {
@@ -145,7 +147,7 @@ impl<P: consensus::Parameters> RusqliteMigration for Migration<P> {
                         named_params![
                             ":account_id": account_id,
                             ":account_kind": account_kind_derived,
-                            ":seed_id": seed_id.as_bytes(),
+                            ":seed_id": seed_id.to_bytes(),
                             ":account_index": account_index,
                             ":ufvk": ufvk,
                             ":uivk": uivk,

zcash_keys/CHANGELOG.md

@@ -7,7 +7,6 @@ and this library adheres to Rust's notion of
 ## [Unreleased]
 
 ### Added
-- `zcash_keys::keys::HdSeedFingerprint`
 - `zcash_keys::address::Address::has_receiver`
 - `impl Display for zcash_keys::keys::AddressGenerationError`
 - `impl std::error::Error for zcash_keys::keys::AddressGenerationError`

zcash_keys/src/keys.rs

@@ -1,6 +1,6 @@
 //! Helper functions for managing light client key material.
-use blake2b_simd::Params as blake2bParams;
-use secrecy::{ExposeSecret, SecretVec};
+
+
 use std::{error, fmt};
 
 use zcash_address::unified::{self, Container, Encoding, Typecode};
@@ -73,53 +73,6 @@ pub mod sapling {
     }
 }
 
-/// A [ZIP 32 seed fingerprint] of a seed used for an HD account.
-///
-/// For wallets that use [BIP 39] mnemonic phrases, this is the fingerprint of the binary
-/// seed [produced from the mnemonic].
-///
-/// [ZIP 32 seed fingerprint]: https://zips.z.cash/zip-0032#seed-fingerprints
-/// [BIP 39]: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
-/// [produced from the mnemonic]: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki#from-mnemonic-to-seed
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct HdSeedFingerprint([u8; 32]);
-
-impl HdSeedFingerprint {
-    /// Generates the fingerprint from a given seed.
-    ///
-    /// Panics if the length of the seed is not between 32 and 252 bytes inclusive.
-    pub fn from_seed(seed: &SecretVec<u8>) -> Self {
-        let len = seed.expose_secret().len();
-        let len = match len {
-            32..=252 => [u8::try_from(len).unwrap()],
-            _ => panic!("ZIP 32 seeds MUST be at least 32 bytes and at most 252 bytes"),
-        };
-        const PERSONALIZATION: &[u8] = b"Zcash_HD_Seed_FP";
-        let hash = blake2bParams::new()
-            .hash_length(32)
-            .personal(PERSONALIZATION)
-            .to_state()
-            .update(&len)
-            .update(seed.expose_secret())
-            .finalize();
-        Self(
-            hash.as_bytes()
-                .try_into()
-                .expect("BLAKE2b-256 hash length is 32 bytes"),
-        )
-    }
-
-    /// Instantiates the fingerprint from a buffer containing a previously computed fingerprint.
-    pub fn from_bytes(hash: [u8; 32]) -> Self {
-        Self(hash)
-    }
-
-    /// Returns the bytes of the fingerprint.
-    pub fn as_bytes(&self) -> &[u8; 32] {
-        &self.0
-    }
-}
-
 #[cfg(feature = "transparent-inputs")]
 fn to_transparent_child_index(j: DiversifierIndex) -> Option<NonHardenedChildIndex> {
     let (low_4_bytes, rest) = j.as_bytes().split_at(4);