diff --git a/OpenRCT2.xcodeproj/project.pbxproj b/OpenRCT2.xcodeproj/project.pbxproj
index 647207345e..b53a9e1c1d 100644
--- a/OpenRCT2.xcodeproj/project.pbxproj
+++ b/OpenRCT2.xcodeproj/project.pbxproj
@@ -802,6 +802,7 @@
 		E6C71B6165224F65AA87E65B /* RideUseSystem.h in Headers */ = {isa = PBXBuildFile; fileRef = 2DA720D496604387806AC168 /* RideUseSystem.h */; };
 		C8D612EB56BD4214BEC0F7FF /* GroupVector.hpp in Headers */ = {isa = PBXBuildFile; fileRef = F4D523B8782E4C458AF1490D /* GroupVector.hpp */; };
 		B2F44E535BD14A03BE8B9D14 /* ZipStream.hpp in Headers */ = {isa = PBXBuildFile; fileRef = F28A181D311D4E078FDB090C /* ZipStream.hpp */; };
+		7CDC7EE9B12E40FB9FE78546 /* Crypt.OpenRCT2.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4248E4E4394842D4AF6119DA /* Crypt.OpenRCT2.cpp */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -1907,6 +1908,7 @@
 		2DA720D496604387806AC168 /* RideUseSystem.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RideUseSystem.h; path = src/openrct2/peep/RideUseSystem.h; sourceTree = SOURCE_ROOT; };
 		F4D523B8782E4C458AF1490D /* GroupVector.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = GroupVector.hpp; path = src/openrct2/core/GroupVector.hpp; sourceTree = SOURCE_ROOT; };
 		F28A181D311D4E078FDB090C /* ZipStream.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = ZipStream.hpp; path = src/openrct2/core/ZipStream.hpp; sourceTree = SOURCE_ROOT; };
+		4248E4E4394842D4AF6119DA /* Crypt.OpenRCT2.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Crypt.OpenRCT2.cpp; path = src/openrct2/core/Crypt.OpenRCT2.cpp; sourceTree = SOURCE_ROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -2578,6 +2580,7 @@
 				BA2317BF6FB54E328DEB7055 /* EnumMap.hpp */,
 				F4D523B8782E4C458AF1490D /* GroupVector.hpp */,
 				F28A181D311D4E078FDB090C /* ZipStream.hpp */,
+				4248E4E4394842D4AF6119DA /* Crypt.OpenRCT2.cpp */,
 			);
 			path = core;
 			sourceTree = "<group>";
@@ -4484,6 +4487,7 @@
 				5B6E418A2F264952BA0CC2F2 /* ScTileElement.cpp in Sources */,
 				6C90BE01D190493295071B23 /* ScTile.cpp in Sources */,
 				258C212125F84FA2B4C3BCAE /* RideUseSystem.cpp in Sources */,
+				7CDC7EE9B12E40FB9FE78546 /* Crypt.OpenRCT2.cpp in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/src/openrct2/core/Crypt.OpenRCT2.cpp b/src/openrct2/core/Crypt.OpenRCT2.cpp
new file mode 100644
index 0000000000..f3ad2d17d5
--- /dev/null
+++ b/src/openrct2/core/Crypt.OpenRCT2.cpp
@@ -0,0 +1,101 @@
+/*****************************************************************************
+ * Copyright (c) 2014-2021 OpenRCT2 developers
+ *
+ * For a complete list of all authors, please refer to contributors.md
+ * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is licensed under the GNU General Public License version 3.
+ *****************************************************************************/
+
+#include "Crypt.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+
+using namespace Crypt;
+
+class OpenRCT2FNV1aAlgorithm : public FNV1aAlgorithm
+{
+private:
+    static constexpr uint64_t Offset = 0xCBF29CE484222325ULL;
+    static constexpr uint64_t Prime = 0x00000100000001B3ULL;
+
+    uint64_t _data = Offset;
+    uint8_t _rem[8]{};
+    size_t _remLen{};
+
+    void ProcessRemainder()
+    {
+        if (_remLen > 0)
+        {
+            uint64_t temp{};
+            std::memcpy(&temp, _rem, _remLen);
+            _data ^= temp;
+            _data *= Prime;
+            _remLen = 0;
+        }
+    }
+
+public:
+    HashAlgorithm* Clear() override
+    {
+        _data = Offset;
+        return this;
+    }
+
+    HashAlgorithm* Update(const void* data, size_t dataLen) override
+    {
+        if (dataLen == 0)
+            return this;
+
+        auto src = reinterpret_cast<const uint64_t*>(data);
+        if (_remLen > 0)
+        {
+            // We have remainder, so fill rest of it with bytes from src
+            auto fillLen = sizeof(uint64_t) - _remLen;
+            assert(_remLen + fillLen <= sizeof(uint64_t));
+            std::memcpy(_rem + _remLen, src, fillLen);
+            src = reinterpret_cast<const uint64_t*>(reinterpret_cast<const uint8_t*>(src) + fillLen);
+            _remLen += fillLen;
+            dataLen -= fillLen;
+            ProcessRemainder();
+        }
+
+        // Process every block of 8 bytes
+        while (dataLen >= sizeof(uint64_t))
+        {
+            auto temp = *src++;
+            _data ^= temp;
+            _data *= Prime;
+            dataLen -= sizeof(uint64_t);
+        }
+
+        // Store the remaining data (< 8 bytes)
+        if (dataLen > 0)
+        {
+            _remLen = dataLen;
+            std::memcpy(&_rem, src, dataLen);
+        }
+        return this;
+    }
+
+    Result Finish() override
+    {
+        ProcessRemainder();
+
+        Result res;
+        std::memcpy(res.data(), &_data, sizeof(_data));
+        return res;
+    }
+};
+
+namespace Crypt
+{
+    std::unique_ptr<FNV1aAlgorithm> CreateFNV1a()
+    {
+        return std::make_unique<OpenRCT2FNV1aAlgorithm>();
+    }
+} // namespace Crypt
diff --git a/src/openrct2/core/Crypt.h b/src/openrct2/core/Crypt.h
index 18967bd875..87baf9c751 100644
--- a/src/openrct2/core/Crypt.h
+++ b/src/openrct2/core/Crypt.h
@@ -48,13 +48,20 @@ namespace Crypt
 
     using Sha1Algorithm = HashAlgorithm<20>;
     using Sha256Algorithm = HashAlgorithm<32>;
+    using FNV1aAlgorithm = HashAlgorithm<8>;
 
     // Factories
+    [[nodiscard]] std::unique_ptr<FNV1aAlgorithm> CreateFNV1a();
     [[nodiscard]] std::unique_ptr<Sha1Algorithm> CreateSHA1();
     [[nodiscard]] std::unique_ptr<Sha256Algorithm> CreateSHA256();
     [[nodiscard]] std::unique_ptr<RsaAlgorithm> CreateRSA();
     [[nodiscard]] std::unique_ptr<RsaKey> CreateRSAKey();
 
+    inline FNV1aAlgorithm::Result FNV1a(const void* data, size_t dataLen)
+    {
+        return CreateFNV1a()->Update(data, dataLen)->Finish();
+    }
+
     inline Sha1Algorithm::Result SHA1(const void* data, size_t dataLen)
     {
         return CreateSHA1()->Update(data, dataLen)->Finish();
diff --git a/src/openrct2/libopenrct2.vcxproj b/src/openrct2/libopenrct2.vcxproj
index d49c087fba..7010f9cf3e 100644
--- a/src/openrct2/libopenrct2.vcxproj
+++ b/src/openrct2/libopenrct2.vcxproj
@@ -598,6 +598,7 @@
     <ClCompile Include="core\ChecksumStream.cpp" />
     <ClCompile Include="core\Console.cpp" />
     <ClCompile Include="core\Crypt.CNG.cpp" />
+    <ClCompile Include="core\Crypt.OpenRCT2.cpp" />
     <ClCompile Include="core\Crypt.OpenSSL.cpp" />
     <ClCompile Include="core\Diagnostics.cpp" />
     <ClCompile Include="core\File.cpp" />