add tests for confidential mint and burn

Author: samkim-crypto

token/confidential-transfer/proof-tests/tests/proof_test.rs

@@ -4,10 +4,12 @@ use {
         zk_elgamal_proof_program::proof_data::ZkProofData,
     },
     spl_token_confidential_transfer_proof_extraction::{
-        transfer::TransferProofContext, transfer_with_fee::TransferWithFeeProofContext,
-        withdraw::WithdrawProofContext,
+        burn::BurnProofContext, mint::MintProofContext, transfer::TransferProofContext,
+        transfer_with_fee::TransferWithFeeProofContext, withdraw::WithdrawProofContext,
     },
     spl_token_confidential_transfer_proof_generation::{
+        burn::{burn_split_proof_data, BurnProofData},
+        mint::{mint_split_proof_data, MintProofData},
         transfer::{transfer_split_proof_data, TransferProofData},
         transfer_with_fee::{transfer_with_fee_split_proof_data, TransferWithFeeProofData},
         withdraw::{withdraw_proof_data, WithdrawProofData},
@@ -182,3 +184,79 @@ fn test_withdraw_validity(spendable_balance: u64, withdraw_amount: u64) {
     )
     .unwrap();
 }
+
+#[test]
+fn test_mint_proof_correctness() {
+    test_mint_validity(0);
+    test_mint_validity(1);
+    test_mint_validity(65535);
+    test_mint_validity(65536);
+    test_mint_validity(281474976710655);
+}
+
+fn test_mint_validity(mint_amount: u64) {
+    let destination_keypair = ElGamalKeypair::new_rand();
+    let destination_pubkey = destination_keypair.pubkey();
+
+    let auditor_keypair = ElGamalKeypair::new_rand();
+    let auditor_pubkey = auditor_keypair.pubkey();
+
+    let MintProofData {
+        ciphertext_validity_proof_data,
+        range_proof_data,
+    } = mint_split_proof_data(mint_amount, destination_pubkey, auditor_pubkey).unwrap();
+
+    ciphertext_validity_proof_data.verify_proof().unwrap();
+    range_proof_data.verify_proof().unwrap();
+
+    MintProofContext::verify_and_extract(
+        ciphertext_validity_proof_data.context_data(),
+        range_proof_data.context_data(),
+    )
+    .unwrap();
+}
+
+#[test]
+fn test_burn_proof_correctness() {
+    test_burn_validity(0, 0);
+    test_burn_validity(77, 55);
+    test_burn_validity(65535, 65535);
+    test_burn_validity(65536, 65536);
+    test_burn_validity(281474976710655, 281474976710655);
+}
+
+fn test_burn_validity(spendable_balance: u64, burn_amount: u64) {
+    let source_keypair = ElGamalKeypair::new_rand();
+    let aes_key = AeKey::new_rand();
+
+    let auditor_keypair = ElGamalKeypair::new_rand();
+    let auditor_pubkey = auditor_keypair.pubkey();
+
+    let spendable_balance_ciphertext = source_keypair.pubkey().encrypt(spendable_balance);
+    let decryptable_balance = aes_key.encrypt(spendable_balance);
+
+    let BurnProofData {
+        equality_proof_data,
+        ciphertext_validity_proof_data,
+        range_proof_data,
+    } = burn_split_proof_data(
+        &spendable_balance_ciphertext,
+        &decryptable_balance,
+        burn_amount,
+        &source_keypair,
+        &aes_key,
+        auditor_pubkey,
+    )
+    .unwrap();
+
+    equality_proof_data.verify_proof().unwrap();
+    ciphertext_validity_proof_data.verify_proof().unwrap();
+    range_proof_data.verify_proof().unwrap();
+
+    BurnProofContext::verify_and_extract(
+        equality_proof_data.context_data(),
+        ciphertext_validity_proof_data.context_data(),
+        range_proof_data.context_data(),
+    )
+    .unwrap();
+}