asset: limit max value of issuance leaf to math.MaxUint32

Makefile

@@ -267,6 +267,7 @@ gen-deterministic-test-vectors:
 	make unit gen-test-vectors=true pkg=address case=TestAddressEncoding
 	make unit gen-test-vectors=true pkg=asset case=TestAssetEncoding
 	make unit gen-test-vectors=true pkg=asset case=TestDeriveBurnKey
+	make unit gen-test-vectors=true pkg=asset case=TestAssetMaxAmount
 	make unit gen-test-vectors=true pkg=mssmt case=TestProofEncoding
 	make unit gen-test-vectors=true pkg=mssmt case=TestInsertionOverflow
 	make unit gen-test-vectors=true pkg=mssmt case=TestReplaceWithEmptyBranch

address/address_test.go

@@ -43,7 +43,7 @@ func randAddress(t *testing.T, net *ChainParams, v Version, groupPubKey,
 	}
 
 	if amt == nil && assetType == asset.Normal {
-		amount = test.RandInt[uint64]()
+		amount = uint64(test.RandInt[uint32]())
 	}
 
 	var tapscriptSibling *commitment.TapscriptPreimage

address/mock.go

@@ -44,7 +44,7 @@ func RandAddr(t testing.TB, params *ChainParams,
 	internalKey := test.RandPrivKey(t)
 
 	genesis := asset.RandGenesis(t, asset.Type(test.RandInt31n(2)))
-	amount := test.RandInt[uint64]()
+	amount := uint64(test.RandInt[uint32]())
 	if genesis.Type == asset.Collectible {
 		amount = 1
 	}

address/testdata/address_tlv_encoding_generated.json

@@ -10,10 +10,10 @@
         "script_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "internal_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "tapscript_sibling": "",
-        "amount": 5577006791947779410,
+        "amount": 134020434,
         "proof_courier_addr": "hashmail://rand.hashmail.proof.courier:443"
       },
-      "expected": "taprt1qqqsqqspqqzzq73cz93shve4q0r9xmp6yg7netktj0l9ta9ngw2j3m0j0vgd8r5nqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgyl7nt9sgss0l8a2gxz56rpwd5x6ctfdsaz7tmjv9hxgtngv9eksmtpd9kzuurjdahkvtnrda6hy6t9wgargdpn5zn5dz",
+      "expected": "taprt1qqqsqqspqqzzq73cz93shve4q0r9xmp6yg7netktj0l9ta9ngw2j3m0j0vgd8r5nqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgzluplul4fqc2ngv9eksmtpd9kr5te0wfskuepwdpshx6rdv95kctnswfhk7e3wvdhh2unfv4er5dp5xvsnxtg0",
       "comment": "valid regtest address"
     },
     {
@@ -26,10 +26,10 @@
         "script_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "internal_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "tapscript_sibling": "",
-        "amount": 3510942875414458836,
+        "amount": 2210689492,
         "proof_courier_addr": "hashmail://rand.hashmail.proof.courier:443"
       },
-      "expected": "tapsb1qqqsqqspqqzzpzkt292zv9p9m4snlksemmsq550ft35jrhu27sy9h3rgwp4egmlvqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgyl7v9etlcc83r36sxz56rpwd5x6ctfdsaz7tmjv9hxgtngv9eksmtpd9kzuurjdahkvtnrda6hy6t9wgargdpnrzxc4w",
+      "expected": "tapsb1qqqsqqspqqzzpzkt292zv9p9m4snlksemmsq550ft35jrhu27sy9h3rgwp4egmlvqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgzlaq7yw82qc2ngv9eksmtpd9kr5te0wfskuepwdpshx6rdv95kctnswfhk7e3wvdhh2unfv4er5dp5xv6f3kgz",
       "comment": "valid simnet address"
     },
     {
@@ -42,10 +42,10 @@
         "script_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "internal_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "tapscript_sibling": "",
-        "amount": 2740103009342231109,
+        "amount": 1473417797,
         "proof_courier_addr": "hashmail://rand.hashmail.proof.courier:443"
       },
-      "expected": "taptb1qqqsqqspqqzzqcz9nja56nn20zuvtp297tlqy6kjz7lsltlw6hl4uwen08r93h0nqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgyl7fsxe544055jg5xz56rpwd5x6ctfdsaz7tmjv9hxgtngv9eksmtpd9kzuurjdahkvtnrda6hy6t9wgargdpny8e5zg",
+      "expected": "taptb1qqqsqqspqqzzqcz9nja56nn20zuvtp297tlqy6kjz7lsltlw6hl4uwen08r93h0nqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgzlu47jjfzsc2ngv9eksmtpd9kr5te0wfskuepwdpshx6rdv95kctnswfhk7e3wvdhh2unfv4er5dp5xvxehu4k",
       "comment": "valid testnet address"
     },
     {
@@ -58,10 +58,10 @@
         "script_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "internal_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
         "tapscript_sibling": "",
-        "amount": 545291762129038907,
+        "amount": 4104515131,
         "proof_courier_addr": "hashmail://rand.hashmail.proof.courier:443"
       },
-      "expected": "tapbc1qqqsqqspqqzzpuk8pcfxrdmp7zvynxgc4nmveuvd0kw00nttury5qcc0qep6hqevqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgyl7pu3g0mlff0w8vxz56rpwd5x6ctfdsaz7tmjv9hxgtngv9eksmtpd9kzuurjdahkvtnrda6hy6t9wgargdpnlhg0u8",
+      "expected": "tapbc1qqqsqqspqqzzpuk8pcfxrdmp7zvynxgc4nmveuvd0kw00nttury5qcc0qep6hqevqcss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pqss9g90avt97rkrdzqtdrst427e4kwx9lg6dx4fnz7rp6drgcszupu0pgzlaa99acasc2ngv9eksmtpd9kr5te0wfskuepwdpshx6rdv95kctnswfhk7e3wvdhh2unfv4er5dp5xv0h7upk",
       "comment": "valid mainnet address"
     },
     {

asset/asset.go

@@ -8,6 +8,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math"
 	"reflect"
 	"strings"
 	"unicode"
@@ -30,6 +31,16 @@ const (
 	// This byte length is equivalent to character count for single-byte
 	// UTF-8 characters.
 	MaxAssetNameLength = 64
+
+	// MaxIssuanceUnits is the maximum number of units that can be issued
+	// in a single asset UTXO for v0 and v1 assets.
+	MaxIssuanceUnits = math.MaxUint32
+)
+
+var (
+	// ErrMaxIssuanceUnits is returned when an asset is being issued with
+	// more units that permitted.
+	ErrMaxIssuanceUnits = errors.New("asset: max issuance units exceeded")
 )
 
 // SerializedKey is a type for representing a public key, serialized in the
@@ -883,6 +894,12 @@ func New(genesis Genesis, amount, locktime, relativeLocktime uint64,
 			genesis.Type)
 	}
 
+	// An asset can't be created that exceeds the max issuance value for
+	// this asset version.
+	if amount > MaxIssuanceUnits {
+		return nil, fmt.Errorf("%w: %d", ErrMaxIssuanceUnits, amount)
+	}
+
 	// Valid genesis asset witness.
 	genesisWitness := Witness{
 		PrevID:          &PrevID{},

asset/asset_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"crypto/sha256"
 	"encoding/hex"
+	"math"
 	"os"
 	"path/filepath"
 	"testing"
@@ -38,8 +39,11 @@ var (
 
 	generatedTestVectorName = "asset_tlv_encoding_generated.json"
 
+	amtTestVectorName = "asset_tlv_amounts.json"
+
 	allTestVectorFiles = []string{
 		generatedTestVectorName,
+		amtTestVectorName,
 		"asset_tlv_encoding_error_cases.json",
 	}
 
@@ -757,3 +761,61 @@ func runBIPTestVector(t *testing.T, testVectors *TestVectors) {
 		})
 	}
 }
+
+// TestAssetMaxAmount tests that the maximum amount of an asset is correctly
+// enforced for v0 and v1 assets.
+func TestAssetMaxAmount(t *testing.T) {
+	t.Parallel()
+
+	testVectors := &TestVectors{}
+
+	testGen := splitGen
+	testGen.Type = Normal
+
+	t.Run("max_uint32_plus_1", func(t *testing.T) {
+		_, err := New(
+			testGen, math.MaxUint32+1, 0, 0, NewScriptKey(pubKey),
+			nil,
+		)
+		require.ErrorIs(t, err, ErrMaxIssuanceUnits)
+
+		asset0Error, err := New(
+			testGen, math.MaxUint32, 0, 0, NewScriptKey(pubKey),
+			nil,
+		)
+		require.NoError(t, err)
+
+		asset0Error.Amount = math.MaxUint32 + 1
+
+		testVectors.ErrorTestCases = append(
+			testVectors.ErrorTestCases, &ErrorTestCase{
+				Asset:   NewTestFromAsset(t, asset0Error),
+				Error:   ErrMaxIssuanceUnits.Error(),
+				Comment: "invalid asset value > max uint32",
+			},
+		)
+	})
+
+	t.Run("max_uint32", func(t *testing.T) {
+		asset1, err := New(
+			testGen, math.MaxUint32, 0, 0, NewScriptKey(pubKey),
+			nil,
+		)
+		require.NoError(t, err)
+
+		var buf bytes.Buffer
+		require.NoError(t, asset1.Encode(&buf))
+
+		testVectors.ValidTestCases = append(
+			testVectors.ValidTestCases, &ValidTestCase{
+				Asset:    NewTestFromAsset(t, asset1),
+				Expected: hex.EncodeToString(buf.Bytes()),
+				Comment:  "max uint32 valid asset value",
+			},
+		)
+	})
+
+	// Write test vectors to file. This is a no-op if the
+	// "gen_test_vectors" build tag is not set.
+	test.WriteTestVectors(t, amtTestVectorName, testVectors)
+}

asset/mock.go

@@ -355,7 +355,10 @@ func RandAssetWithValues(t testing.TB, genesis Genesis, groupKey *GroupKey,
 
 	t.Helper()
 
-	units := test.RandInt[uint64]() + 1
+	units := uint64(test.RandInt[uint32]())
+	if units == 0 {
+		units = 1
+	}
 
 	switch genesis.Type {
 	case Normal:

asset/testdata/asset_tlv_amounts.json

@@ -0,0 +1,66 @@
+{
+  "valid_test_cases": [
+    {
+      "asset": {
+        "version": 0,
+        "genesis_first_prev_out": "0101010101010101010101010101010101010101010101010101010101010101:1",
+        "genesis_tag": "asset",
+        "genesis_meta_hash": "0102030000000000000000000000000000000000000000000000000000000000",
+        "genesis_output_index": 1,
+        "genesis_type": 0,
+        "amount": 4294967295,
+        "lock_time": 0,
+        "relative_lock_time": 0,
+        "prev_witnesses": [
+          {
+            "prev_id": {
+              "out_point": "0000000000000000000000000000000000000000000000000000000000000000:0",
+              "asset_id": "0000000000000000000000000000000000000000000000000000000000000000",
+              "script_key": "000000000000000000000000000000000000000000000000000000000000000000"
+            },
+            "tx_witness": null,
+            "split_commitment": null
+          }
+        ],
+        "split_commitment_root": null,
+        "script_version": 0,
+        "script_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
+        "group_key": null
+      },
+      "expected": "000100014f010101010101010101010101010101010101010101010101010101010101010100000001056173736574010203000000000000000000000000000000000000000000000000000000000000000001000201000305feffffffff066901670065000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008020000092102a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
+      "comment": "max uint32 valid asset value"
+    }
+  ],
+  "error_test_cases": [
+    {
+      "asset": {
+        "version": 0,
+        "genesis_first_prev_out": "0101010101010101010101010101010101010101010101010101010101010101:1",
+        "genesis_tag": "asset",
+        "genesis_meta_hash": "0102030000000000000000000000000000000000000000000000000000000000",
+        "genesis_output_index": 1,
+        "genesis_type": 0,
+        "amount": 4294967296,
+        "lock_time": 0,
+        "relative_lock_time": 0,
+        "prev_witnesses": [
+          {
+            "prev_id": {
+              "out_point": "0000000000000000000000000000000000000000000000000000000000000000:0",
+              "asset_id": "0000000000000000000000000000000000000000000000000000000000000000",
+              "script_key": "000000000000000000000000000000000000000000000000000000000000000000"
+            },
+            "tx_witness": null,
+            "split_commitment": null
+          }
+        ],
+        "split_commitment_root": null,
+        "script_version": 0,
+        "script_key": "02a0afeb165f0ec36880b68e0baabd9ad9c62fd1a69aa998bc30e9a346202e078f",
+        "group_key": null
+      },
+      "error": "asset: max issuance units exceeded",
+      "comment": "invalid asset value \u003e max uint32"
+    }
+  ]
+}

proof/testdata/ownership-proof.hex

@@ -1 +1 @@
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