1 files changed, 128 insertions, 0 deletions
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
new file mode 100644
index 0000000000..e72b1c4840
--- /dev/null
+++ b/src/rpc/util.cpp
@@ -0,0 +1,128 @@
+// Copyright (c) 2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <key_io.h>
+#include <keystore.h>
+#include <rpc/protocol.h>
+#include <rpc/util.h>
+#include <tinyformat.h>
+#include <utilstrencodings.h>
+
+// Converts a hex string to a public key if possible
+CPubKey HexToPubKey(const std::string& hex_in)
+{
+    if (!IsHex(hex_in)) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid public key: " + hex_in);
+    }
+    CPubKey vchPubKey(ParseHex(hex_in));
+    if (!vchPubKey.IsFullyValid()) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid public key: " + hex_in);
+    }
+    return vchPubKey;
+}
+
+// Retrieves a public key for an address from the given CKeyStore
+CPubKey AddrToPubKey(CKeyStore* const keystore, const std::string& addr_in)
+{
+    CTxDestination dest = DecodeDestination(addr_in);
+    if (!IsValidDestination(dest)) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address: " + addr_in);
+    }
+    CKeyID key = GetKeyForDestination(*keystore, dest);
+    if (key.IsNull()) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("%s does not refer to a key", addr_in));
+    }
+    CPubKey vchPubKey;
+    if (!keystore->GetPubKey(key, vchPubKey)) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("no full public key for address %s", addr_in));
+    }
+    if (!vchPubKey.IsFullyValid()) {
+       throw JSONRPCError(RPC_INTERNAL_ERROR, "Wallet contains an invalid public key");
+    }
+    return vchPubKey;
+}
+
+// Creates a multisig redeemscript from a given list of public keys and number required.
+CScript CreateMultisigRedeemscript(const int required, const std::vector<CPubKey>& pubkeys)
+{
+    // Gather public keys
+    if (required < 1) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "a multisignature address must require at least one key to redeem");
+    }
+    if ((int)pubkeys.size() < required) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("not enough keys supplied (got %u keys, but need at least %d to redeem)", pubkeys.size(), required));
+    }
+    if (pubkeys.size() > 16) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Number of keys involved in the multisignature address creation > 16\nReduce the number");
+    }
+
+    CScript result = GetScriptForMultisig(required, pubkeys);
+
+    if (result.size() > MAX_SCRIPT_ELEMENT_SIZE) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, (strprintf("redeemScript exceeds size limit: %d > %d", result.size(), MAX_SCRIPT_ELEMENT_SIZE)));
+    }
+
+    return result;
+}
+
+class DescribeAddressVisitor : public boost::static_visitor<UniValue>
+{
+public:
+    explicit DescribeAddressVisitor() {}
+
+    UniValue operator()(const CNoDestination& dest) const
+    {
+        return UniValue(UniValue::VOBJ);
+    }
+
+    UniValue operator()(const CKeyID& keyID) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        obj.pushKV("isscript", false);
+        obj.pushKV("iswitness", false);
+        return obj;
+    }
+
+    UniValue operator()(const CScriptID& scriptID) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        obj.pushKV("isscript", true);
+        obj.pushKV("iswitness", false);
+        return obj;
+    }
+
+    UniValue operator()(const WitnessV0KeyHash& id) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        obj.pushKV("isscript", false);
+        obj.pushKV("iswitness", true);
+        obj.pushKV("witness_version", 0);
+        obj.pushKV("witness_program", HexStr(id.begin(), id.end()));
+        return obj;
+    }
+
+    UniValue operator()(const WitnessV0ScriptHash& id) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        obj.pushKV("isscript", true);
+        obj.pushKV("iswitness", true);
+        obj.pushKV("witness_version", 0);
+        obj.pushKV("witness_program", HexStr(id.begin(), id.end()));
+        return obj;
+    }
+
+    UniValue operator()(const WitnessUnknown& id) const
+    {
+        UniValue obj(UniValue::VOBJ);
+        obj.pushKV("iswitness", true);
+        obj.pushKV("witness_version", (int)id.version);
+        obj.pushKV("witness_program", HexStr(id.program, id.program + id.length));
+        return obj;
+    }
+};
+
+UniValue DescribeAddress(const CTxDestination& dest)
+{
+    return boost::apply_visitor(DescribeAddressVisitor(), dest);
+}