feat: add zcash interfaces

rust/apps/zcash/src/lib.rs

@@ -7,7 +7,11 @@ pub mod pczt;
 
 use errors::{Result, ZcashError};
 
-use alloc::string::{String, ToString};
+use alloc::{
+    string::{String, ToString},
+    vec::Vec,
+};
+use pczt::structs::ParsedPczt;
 use zcash_vendor::{
     zcash_keys::keys::{UnifiedAddressRequest, UnifiedFullViewingKey},
     zcash_protocol::consensus::MainNetwork,
@@ -22,6 +26,18 @@ pub fn get_address(ufvk_text: &str) -> Result<String> {
     Ok(address.encode(&MainNetwork))
 }
 
+pub fn check_pczt(pczt: &[u8], ufvk_text: &str, seed_fingerprint: &[u8; 32]) -> Result<()> {
+    unimplemented!()
+}
+
+pub fn parse_pczt(pczt: &[u8], ufvk_text: &str, seed_fingerprint: &[u8; 32]) -> Result<ParsedPczt> {
+    unimplemented!()
+}
+
+pub fn sign_pczt(pczt: &[u8], seed: &[u8]) -> Result<Vec<u8>> {
+    unimplemented!()
+}
+
 // pub fn sign_transaction(tx: &[u8], seed: &[u8]) -> Result<Vec<u8>> {
 //     let mut transaction = tx.clone();
 //     let pczt = PartiallyCreatedTransaction::decode(transaction)?;