Implement PSBT versions

Author: achow101

src/psbt.h

@@ -20,6 +20,7 @@ static constexpr uint8_t PSBT_MAGIC_BYTES[5] = {'p', 's', 'b', 't', 0xff};
 
 // Global types
 static constexpr uint8_t PSBT_GLOBAL_UNSIGNED_TX = 0x00;
+static constexpr uint8_t PSBT_GLOBAL_VERSION = 0xFB;
 
 // Input types
 static constexpr uint8_t PSBT_IN_NON_WITNESS_UTXO = 0x00;
@@ -45,6 +46,9 @@ static constexpr uint8_t PSBT_SEPARATOR = 0x00;
 // to prevent reading a stream indefinitely and running out of memory.
 const std::streamsize MAX_FILE_SIZE_PSBT = 100000000; // 100 MiB
 
+// PSBT version number
+static constexpr uint32_t PSBT_HIGHEST_VERSION = 0;
+
 /** A structure for PSBTs which contain per-input information */
 struct PSBTInput
 {
@@ -398,6 +402,7 @@ struct PartiallySignedTransaction
     std::vector<PSBTInput> inputs;
     std::vector<PSBTOutput> outputs;
     std::map<std::vector<unsigned char>, std::vector<unsigned char>> unknown;
+    std::optional<uint32_t> m_version;
 
     bool IsNull() const;
 
@@ -430,6 +435,12 @@ struct PartiallySignedTransaction
         OverrideStream<Stream> os(&s, s.GetType(), s.GetVersion() | SERIALIZE_TRANSACTION_NO_WITNESS);
         SerializeToVector(os, *tx);
 
+        // PSBT version
+        if (m_version != std::nullopt && *m_version > 0) {
+            SerializeToVector(s, CompactSizeWriter(PSBT_GLOBAL_VERSION));
+            SerializeToVector(s, *m_version);
+        }
+
         // Write the unknown things
         for (auto& entry : unknown) {
             s << entry.first;
@@ -502,6 +513,21 @@ struct PartiallySignedTransaction
                     }
                     break;
                 }
+                case PSBT_GLOBAL_VERSION:
+                {
+                    if (m_version) {
+                        throw std::ios_base::failure("Duplicate Key, version already provided");
+                    } else if (key.size() != 1) {
+                        throw std::ios_base::failure("Global version key is more than one byte type");
+                    }
+                    uint32_t v;
+                    UnserializeFromVector(s, v);
+                    m_version = v;
+                    if (*m_version > PSBT_HIGHEST_VERSION) {
+                        throw std::ios_base::failure("Unsupported version number");
+                    }
+                    break;
+                }
                 // Unknown stuff
                 default: {
                     if (unknown.count(key) > 0) {

test/functional/data/rpc_psbt.json

@@ -19,6 +19,7 @@
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         "cHNidP8BAHMCAAAAAbiWoY6pOQepFsEGhUPXaulX9rvye2NH+NrdlAHg+WgpAQAAAAD/////AkBLTAAAAAAAF6kUqWwXCcLM5BN2zoNqMNT5qMlIi7+HQEtMAAAAAAAXqRSVF/in2XNxAlN1OSxkyp0z+Wtg2YcAAAAAAAEBIBNssgAAAAAAF6kUamsvautR8hRlMRY6OKNTx03DK96HAQcXFgAUo8u1LWpHprjt/uENAwBpGZD0UH0BCGsCRzBEAiAONfH3DYiw67ZbylrsxCF/XXpVwyWBRgofyRbPslzvwgIgIKCsWw5sHSIPh1icNvcVLZLHWj6NA7Dk+4Os2pOnMbQBIQPGStfYHPtyhpV7zIWtn0Q4GXv5gK1zy/tnJ+cBXu4iiwABABYAFMwmJQEz+HDpBEEabxJ5PogPsqZRAAEAFgAUyCrGc3h3FYCmiIspbv2pSTKZ5jU",
+        "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",
         "cHNidP8BACoCAAAAAAFAQg8AAAAAABepFG6Rty1Vk+fUOR4v9E6R6YXDFkHwhwAAAAAAAQEAAQEBagA=",
         "cHNidP8BACoCAAAAAAFAQg8AAAAAABepFG6Rty1Vk+fUOR4v9E6R6YXDFkHwhwAAAAAAAQAAAQABagA=",
         "cHNidP8BADMBAAAAAREREREREREREREREREREREREfrK3hERERERERERERERfwAAAAD/////AAAAAAAAAQEJ//////////8AAQEJAADK/gAAAAAAAA==",
@@ -34,7 +35,8 @@
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         "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",
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-        "cHNidP8BACoCAAAAAAFAQg8AAAAAABepFG6Rty1Vk+fUOR4v9E6R6YXDFkHwhwAAAAAAAA=="
+        "cHNidP8BACoCAAAAAAFAQg8AAAAAABepFG6Rty1Vk+fUOR4v9E6R6YXDFkHwhwAAAAAAAA==",
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     ],
     "creator" : [
         {