kernel: Remove Univalue from kernel library

It is not required by any of the kernel components.
A JSON library should not need to be part of a consensus library.

Author: TheCharlatan

src/Makefile.am

@@ -896,8 +896,8 @@ if BUILD_BITCOIN_KERNEL_LIB
 lib_LTLIBRARIES += $(LIBBITCOINKERNEL)
 
 libbitcoinkernel_la_LDFLAGS = $(AM_LDFLAGS) -no-undefined $(RELDFLAGS) $(PTHREAD_FLAGS)
-libbitcoinkernel_la_LIBADD = $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) $(LIBSECP256K1)
-libbitcoinkernel_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(builddir)/obj -I$(srcdir)/secp256k1/include -DBUILD_BITCOIN_INTERNAL $(BOOST_CPPFLAGS) $(LEVELDB_CPPFLAGS) -I$(srcdir)/$(UNIVALUE_INCLUDE_DIR_INT)
+libbitcoinkernel_la_LIBADD = $(LIBBITCOIN_CRYPTO) $(LIBLEVELDB) $(LIBMEMENV) $(LIBSECP256K1)
+libbitcoinkernel_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(builddir)/obj -I$(srcdir)/secp256k1/include -DBUILD_BITCOIN_INTERNAL $(BOOST_CPPFLAGS) $(LEVELDB_CPPFLAGS)
 
 # libbitcoinkernel requires default symbol visibility, explicitly specify that
 # here so that things still work even when user configures with

src/bitcoin-tx.cpp

@@ -562,6 +562,16 @@ static CAmount AmountFromValue(const UniValue& value)
     return amount;
 }
 
+static std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
+{
+    std::string strHex;
+    if (v.isStr())
+        strHex = v.getValStr();
+    if (!IsHex(strHex))
+        throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
+    return ParseHex(strHex);
+}
+
 static void MutateTxSign(CMutableTransaction& tx, const std::string& flagStr)
 {
     int nHashType = SIGHASH_ALL;

src/core_io.h

@@ -46,7 +46,6 @@ bool DecodeHexBlockHeader(CBlockHeader&, const std::string& hex_header);
  * @see ParseHashV for an RPC-oriented version of this
  */
 bool ParseHashStr(const std::string& strHex, uint256& result);
-std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName);
 [[nodiscard]] util::Result<int> SighashFromStr(const std::string& sighash);
 
 // core_write.cpp

src/core_read.cpp

@@ -10,7 +10,6 @@
 #include <script/sign.h>
 #include <serialize.h>
 #include <streams.h>
-#include <univalue.h>
 #include <util/result.h>
 #include <util/strencodings.h>
 #include <version.h>
@@ -243,16 +242,6 @@ bool ParseHashStr(const std::string& strHex, uint256& result)
     return true;
 }
 
-std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
-{
-    std::string strHex;
-    if (v.isStr())
-        strHex = v.getValStr();
-    if (!IsHex(strHex))
-        throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
-    return ParseHex(strHex);
-}
-
 util::Result<int> SighashFromStr(const std::string& sighash)
 {
     static std::map<std::string, int> map_sighash_values = {

src/test/fuzz/parse_univalue.cpp

@@ -3,7 +3,6 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <chainparams.h>
-#include <core_io.h>
 #include <rpc/client.h>
 #include <rpc/util.h>
 #include <test/fuzz/fuzz.h>
@@ -57,12 +56,6 @@ FUZZ_TARGET_INIT(parse_univalue, initialize_parse_univalue)
         (void)ParseHexO(univalue, random_string);
     } catch (const UniValue&) {
     }
-    try {
-        (void)ParseHexUV(univalue, "A");
-        (void)ParseHexUV(univalue, random_string);
-    } catch (const UniValue&) {
-    } catch (const std::runtime_error&) {
-    }
     try {
         (void)ParseHexV(univalue, "A");
     } catch (const UniValue&) {