Add silentpayments_test_outputs

src/modules/silentpayments/main_impl.h

@@ -139,6 +139,15 @@ static int secp256k1_silentpayments_create_output_pubkey(const secp256k1_context
     return ret;
 }
 
+static void print_hex(unsigned char* data, size_t size) {
+    size_t i;
+    printf("0x");
+    for (i = 0; i < size; i++) {
+        printf("%02x", data[i]);
+    }
+    printf("\n");
+}
+
 int secp256k1_silentpayments_test_outputs(
     const secp256k1_context *ctx,
     const secp256k1_silentpayments_recipient *recipients,
@@ -156,7 +165,9 @@ int secp256k1_silentpayments_test_outputs(
         unsigned char compressed_scan_pubkey[33];
         unsigned char compressed_spend_pubkey[33];
         size_t len;
-
+
+        printf("index: %ld\n", recipients[i].index);
+
         /* Serialize pubkey1 in a compressed form (33 bytes), should always return 1 */
         len = sizeof(compressed_scan_pubkey);
         ret = secp256k1_ec_pubkey_serialize(ctx, compressed_scan_pubkey, &len, &recipients[i].scan_pubkey, SECP256K1_EC_COMPRESSED);
@@ -167,6 +178,13 @@ int secp256k1_silentpayments_test_outputs(
         ret = secp256k1_ec_pubkey_serialize(ctx, compressed_spend_pubkey, &len, &recipients[i].spend_pubkey, SECP256K1_EC_COMPRESSED);
         /* Should be the same size as the size of the output, because we passed a 33 byte array. */
         VERIFY_CHECK(len == sizeof(compressed_spend_pubkey));
+
+        printf("scan_pubkey: ");
+        print_hex(compressed_scan_pubkey, sizeof(compressed_scan_pubkey));
+
+        printf("spend_pubkey: ");
+        print_hex(compressed_spend_pubkey, sizeof(compressed_spend_pubkey));
+
     }
 
     return ret;