token-2022: minor rename pod types with descriptive types (#2983)

Author: samkim-crypto

token/program-2022/src/extension/confidential_transfer/mod.rs

@@ -102,7 +102,7 @@ pub struct ConfidentialTransferAccount {
     pub actual_pending_balance_credit_counter: PodU64,
 
     /// The withheld amount of fees. This will always be zero if fees are never enabled.
-    pub withheld_amount: pod::ElGamalCiphertext,
+    pub withheld_amount: EncryptedWithheldAmount,
 }
 
 impl Extension for ConfidentialTransferAccount {
@@ -121,9 +121,9 @@ impl ConfidentialTransferAccount {
 
     /// Check if a `ConfidentialTransferAccount` is in a closable state
     pub fn closable(&self) -> ProgramResult {
-        if self.pending_balance == pod::ElGamalCiphertext::zeroed()
-            && self.available_balance == pod::ElGamalCiphertext::zeroed()
-            && self.withheld_amount == pod::ElGamalCiphertext::zeroed()
+        if self.pending_balance == EncryptedBalance::zeroed()
+            && self.available_balance == EncryptedBalance::zeroed()
+            && self.withheld_amount == EncryptedWithheldAmount::zeroed()
         {
             Ok(())
         } else {

token/program-2022/src/extension/confidential_transfer/processor.rs

@@ -159,7 +159,7 @@ fn process_configure_account(
     confidential_transfer_account.pending_balance_credit_counter = 0.into();
     confidential_transfer_account.expected_pending_balance_credit_counter = 0.into();
     confidential_transfer_account.actual_pending_balance_credit_counter = 0.into();
-    confidential_transfer_account.withheld_amount = pod::ElGamalCiphertext::zeroed();
+    confidential_transfer_account.withheld_amount = EncryptedWithheldAmount::zeroed();
 
     Ok(())
 }
@@ -234,9 +234,9 @@ fn process_empty_account(
         return Err(ProgramError::InvalidInstructionData);
     }
 
-    confidential_transfer_account.available_balance = pod::ElGamalCiphertext::zeroed();
+    confidential_transfer_account.available_balance = EncryptedBalance::zeroed();
 
-    if confidential_transfer_account.withheld_amount != pod::ElGamalCiphertext::zeroed() {
+    if confidential_transfer_account.withheld_amount != EncryptedWithheldAmount::zeroed() {
         msg!("Withheld amount is not zero");
         return Err(ProgramError::InvalidAccountData);
     }