BIP-352: sending: add step to fail if input privkeys sum a is zero

The test vector data was generated with a Python script
(see https://github.com/theStack/bitcoin/blob/bc15ea8d0f282908b912dbf62bba816ecd82424d/contrib/silentpayments/submit_input_pubkeys_infinity_tx.py),
leading to the following output:

---------------------------------------------------------------------------------------------------------
     Privkey 1: a6df6a0bb448992a301df4258e06a89fe7cf7146f59ac3bd5ff26083acb22ceb
     Privkey 2: 592095f44bb766d5cfe20bda71f9575ed2df6b9fb9addc7e5fdffe0923841456
      Pubkey 1: 02557ef3e55b0a52489b4454c1169e06bdea43687a69c1f190eb50781644ab6975
      Pubkey 2: 03557ef3e55b0a52489b4454c1169e06bdea43687a69c1f190eb50781644ab6975
scriptPubKey 1: 00149d9e24f9fab4e35bf1a6df4b46cb533296ac0792
scriptPubKey 2: 00149860538b5575962776ed0814ae222c7d60c72d7b
     Address 1: tb1qnk0zf706kn34hudxma95dj6nx2t2cpujz7j5t5
     Address 2: tb1qnps98z64wktzwahdpq22ug3v04svwttm7gs8wn
-> Funding tx submitted: 3a286147b25e16ae80aff406f2673c6e565418c40f45c071245cdebc8a94174e

Taproot output address for spending tx: tb1pqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqkgkkf5
-> Spending tx submitted: fe788cf6578d547819def43d79e6c8f0153d4885f5a343d12bd03f34507aabd6
---------------------------------------------------------------------------------------------------------

2 files changed, 49 insertions, 1 deletions

diff --git a/bip-0352/reference.py b/bip-0352/reference.py
index 9b35d04..7882ad1 100755
--- a/bip-0352/reference.py
+++ b/bip-0352/reference.py
@@ -127,6 +127,9 @@ def create_outputs(input_priv_keys: List[Tuple[ECKey, bool]], outpoints: List[CO
         negated_keys.append(k)
 
     a_sum = sum(negated_keys)
+    if not a_sum.valid:
+        # Input privkeys sum is zero -> fail
+        return []
     input_hash = get_input_hash(outpoints, a_sum * G)
     silent_payment_groups: Dict[ECPubKey, List[ECPubKey]] = {}
     for recipient in recipients:
diff --git a/bip-0352/send_and_receive_test_vectors.json b/bip-0352/send_and_receive_test_vectors.json
index f9b205b..c0288bc 100644
--- a/bip-0352/send_and_receive_test_vectors.json
+++ b/bip-0352/send_and_receive_test_vectors.json
@@ -2669,5 +2669,50 @@
                 }
             }
         ]
+    },
+    {
+        "comment": "Input keys sum up to zero / point at infinity: sending fails, receiver skips tx",
+        "sending": [
+            {
+                "given": {
+                    "vin": [
+                        {
+                            "txid": "3a286147b25e16ae80aff406f2673c6e565418c40f45c071245cdebc8a94174e",
+                            "vout": 0,
+                            "scriptSig": "",
+                            "txinwitness": "024730440220085003179ce1a3a88ce0069aa6ea045e140761ab88c22a26ae2a8cfe983a6e4602204a8a39940f0735c8a4424270ac8da65240c261ab3fda9272f6d6efbf9cfea366012102557ef3e55b0a52489b4454c1169e06bdea43687a69c1f190eb50781644ab6975",
+                            "prevout": {
+                                "scriptPubKey": {
+                                    "hex": "00149d9e24f9fab4e35bf1a6df4b46cb533296ac0792"
+                                }
+                            },
+                            "private_key": "a6df6a0bb448992a301df4258e06a89fe7cf7146f59ac3bd5ff26083acb22ceb"
+                        },
+                        {
+                            "txid": "3a286147b25e16ae80aff406f2673c6e565418c40f45c071245cdebc8a94174e",
+                            "vout": 1,
+                            "scriptSig": "",
+                            "txinwitness": "0247304402204586a68e1d97dd3c6928e3622799859f8c3b20c3c670cf654cc905c9be29fdb7022043fbcde1689f3f4045e8816caf6163624bd19e62e4565bc99f95c533e599782c012103557ef3e55b0a52489b4454c1169e06bdea43687a69c1f190eb50781644ab6975",
+                            "prevout": {
+                                "scriptPubKey": {
+                                    "hex": "00149860538b5575962776ed0814ae222c7d60c72d7b"
+                                }
+                            },
+                            "private_key": "592095f44bb766d5cfe20bda71f9575ed2df6b9fb9addc7e5fdffe0923841456"
+                        }
+                    ],
+                    "recipients": [
+                        "sp1qqtrqglu5g8kh6mfsg4qxa9wq0nv9cauwfwxw70984wkqnw2uwz0w2qnehen8a7wuhwk9tgrzjh8gwzc8q2dlekedec5djk0js9d3d7qhnq6lqj3s"
+                    ]
+                },
+                "expected": {
+                    "outputs": [
+                        []
+                    ]
+                }
+            }
+        ],
+        "receiving": [
+        ]
     }
-]
\ No newline at end of file
+]