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diff --git a/src/tests/resources/libolm-crypto-dump b/src/tests/resources/libolm-crypto-dump
new file mode 100644
--- /dev/null
+++ b/src/tests/resources/libolm-crypto-dump
@@ -0,0 +1 @@
+{"a":{"account":"B1oFFRXEVZ4gOxukD6L3Qg+qcbLxs6PwGUnSA1nC7XCXFFUP+7ALzG+e1TMQs6PmXBgoQwHbIDaQzTBEMonMa7basPn9N+wG1yJ1loJ4V38+xFwowTMNoW836Rmd00WcYZzsqh4RA+NUclCJIhGB/bTKHLDXLea80j3pWbEVcJgX96RRAZVcVNkkLaxz9DkfsNQ7c1Z8RtLiHPiBL23guWS+riSjAvSL310J08fBLThVHw5u/oV2C2/5s22zHMK83/MCwqf4jzhEg0HbAG1Js6QuYMMIU3PEVPI06s9KLOx2dj8c/a/qazA/pP56wtpS2MOeyD+71EE6Fgu/4RMhOTAYRoXCDGxR","inboundGroupSessions":[[{"roomId":"!foo:example.com","sessionId":"c+I3OYLcgq6l/tPqK1zoUTlBoBuqx2R0t7XTMd8C8qM"},{"decryptedEvents":[0,{"eventId":"$1","originServerTs":1234}],"ed25519Key":"wKQXSqbPVhMrLoQIoKwy9Xx2BTrC40qxZjVynbu+404","session":"iuNeOLUojoNzx9yVAbzuJe+4Dm9DBR9834tvT37DTCJ2YwYQuKs/YT95/L2k/MLFi1bo+hLZVYB72Ccdu2VfrZmF2n7w1OEkv7VjAyiQcWAB882d66/uDtj6sGwUgGXrqpdzPMLJNlUL6wIChcow3G0PzIZNHRl4diEAditVnRjV81xp1/5eia7iZoB8/4NMvQQq+TKm+X2Knh907lWHWMz5RNhs0REtG66GCLqV9FLxvg2stAG/wArkAx5QNyBURiaJ+ZykcejFmUVL73uVTN88JR7vdqtPtnsxeEZekdhQJLIq6lQUEngp8sdGHNJMuVg11Kbd4nFVL63ty7TIY1ihGgPMaaxP+1JSPXuqagusmx/UutACe2YbnAmxQ1c2n+MX0J3e0ohh/hIC9JyOSICz2bAaZlRn","valid":true}]],"knownSessions":{"BwCDm5MhEXEBnmvJBybExex/WBA9qpxwRVVqiTzrSnM":{"data":"r1I8V4qsBmxI2XprDZwMKp9BdQ46OeWYLX2/PZTcgcAtKSTLmGfrf0KvEW3DyRci+mC8YpCJnADsBg9hmEMtOCIYaAA7V6iu/MG7KdnASOdcYqBisDz9P7/7Gv12+bCxmtOV3VrbberDRoiQuzqofYNKcIz51usLaecsfkALsL32qdg5+uSHbYYacNpYWcAbX9ccgvhTxmDf2S462clNM6IPuk2ysszEqtN4K5CFnEYI/a+QzF8t/TjtscXPpjRxgIooL6NA2O1z5FinOwlXNeEPi1ZDeFXFz9K1rS8KJAxLEs+StBC6jEizobBWql3hgXZ8M3tdo89La0CkKjMs7/zRUwwlTuvH7dxuvXSWp0TJ0JqDKe284IVixMzkaspQyZfQqZdQI/x6lKGsHLuUF8SJYIDbn2S1X++z7lqS+qG/YFBzYa/DgA","valid":true}},"numUnpublishedKeys":1,"outboundGroupSessions":{"!foo:example.com":{"creationTime":0,"initialSessionKey":"AgAAAABMSXg1LKCj9vjzTsBX4VnfwERzIKfh1YH3MYHNI+6eD328SrSnBOiN4rvCtH8yDVMSsUpfOj9DuJyx26G0EEmzbawYIbSXtCJ0qyIYMFhopsigemzuk0clZ6prp36piOSyWUzi8EKjt495uAwh3gNMl1MFFa9pEaMxhMhdjiMqF3PiNzmC3IKupf7T6itc6FE5QaAbqsdkdLe10zHfAvKjX6NcSCo07Ww1RwAqYE6UqKEMwb2xrTidoM15AXaS6RJ9R+r0uaQv2r4Zn30yEV4XcrtBTGRvwoVJHDExToSgCw","session":"uy5XSz5KAT1WO7HtNe8k/PxbwjLnR/OuMNM4R0WOn40j3hAChlXDyu3+SKLt8SilQgFM+xRFGDCSdsBbPh1CiCxtnZQpPxOs0EiTPp2mOWz58JYRmPnR9u6m1EVtTa5xNmMnIGNSSDjNmSe8iEcBRA5T48N1gvlPVece8RyA0tnj1vYEOaSlIKN4Gr8yw8PGH2cYnqLynN1L2Jl7xXbcvRSlnYWJaT/1MIde1FM2M7zeyqBO5DUjg7UK/O34SwNmdjTwxXMHeLOQSiyzYDX9n1u3VOnfGHvR/KHBbcedeZk6ybz9tQMS4uQWZseWmE0wDMftH0x7PeE","valid":true}},"uploadedOneTimeKeysCount":{},"valid":true},"aIdKey":"uZ4S7S9ctMyUYfqLA4WZD5BnitZFW4Df44SvC2uDPAs","b":{"account":"RYO5gwfVAjWsIKWI/3Lil3VgMnatK61K2xHYvUHn+po3LyXZXUC4O94AN/w/0pROg2T+DxDvAMGkvgnICBmh4KZmiXW4CZ/8ghLp2a59C8hqumx8TrQxHpUQOlGgRCaWw/Er4/hq6zpI144fwW4tv1MZVVH5mM6CRbMKm0HNRYgt03asgZjHcV8scu4iGjvalzdgy5hJZ+ltbTlynZOmfR5dQO8nX1x5QnCLX4UGoVzPPU7VygbQTw","inboundGroupSessions":[],"knownSessions":{"uZ4S7S9ctMyUYfqLA4WZD5BnitZFW4Df44SvC2uDPAs":{"data":"eVzVrQDp5Qqe+8RpOnUOQHBAp4iWOzOcdxGAzXj8nu085A/AmXc29JwaVA8FvLLtXsrYCJl57iQAKArwcMRm1t+mONm3NWwJ47xUi0vgTooMz2UwcIPM35bbQjIIoSxnzekL9fE1WfD9DvmzHHhRsuBa3ItlEFXoKU5PrBjym1aojeDTI7xmbGIubHgOdRBXgO1RNgi6QQduYMsHNOVwgbXt0Pt28HC1WS//fn54TiNsr/MzUROxho4GJM4i/VagjZtLvmGKy5mF9n7jz+7EW1nfp3Oq5bCAM+W2E3FngcEC7zEcQ4uw6mgmWoSkqHcYSrupPDlaSLhTnkPHsFaPOBfSEvPIev3b","valid":true}},"numUnpublishedKeys":0,"outboundGroupSessions":{},"uploadedOneTimeKeysCount":{},"valid":true},"bIdKey":"BwCDm5MhEXEBnmvJBybExex/WBA9qpxwRVVqiTzrSnM","seeds":{"construct1":"09+5R50uW6VrIXFT4xDxsZXsvPPSaRCEgqZCCffy4X8ee0ufD0z0y2wm8TFUEIclsCXN98BBBsdx32oUiyWRqA","construct2":"26TV5vqx7kgfBKUU42xIFZqDQ1V+IsRCzoMCSFC1yb3rG4rH2y/DhHJjad0oBLyoJOqn6AVhLlDrM26LwP1bsA","createOutbound":"Xm2Dc7QGroJsN8Lg9ISEHQQt1OTmQkxegw75/nh5KMWLRAfHGwVoAcciYVUGdjkXoG+beKNt2X5VaJ+EVZXD/Q","encryptOlm1":"k4cg5wT7K+Aw343n5s6JKKPvBzxhzh4PRi7ThOAa7eA","encryptOlm2":"VbPQeG/Dz0GC737thelfbtydOX4H3f8tqp2dDnpW9Eo","oneTimeKeys1":"VMDpOTs+KZvsA/M+BcDWhHyHp0wETQExavAseIELi5M","oneTimeKeys2":"XAdNFVxudQ6ojVHnVW365q6bEdoNGCjwzl+Wq82E1J4","rotateMegOlm1":"TEl4NSygo/b4807AV+FZ38BEcyCn4dWB9zGBzSPung99vEq0pwTojeK7wrR/Mg1TErFKXzo/Q7icsduhtBBJs22sGCG0l7QidKsiGDBYaKbIoHps7pNHJWeqa6d+qYjksllM4vBCo7ePebgMId4DTJdTBRWvaRGjMYTIXY4jKhenm69u/aTn2+rBXEYCF9IT2UMniHvMLV6h3TlYOLNbxA"}}
diff --git a/tools/generate-libolm-crypto-dump.cpp b/tools/generate-libolm-crypto-dump.cpp
new file mode 100644
--- /dev/null
+++ b/tools/generate-libolm-crypto-dump.cpp
@@ -0,0 +1,101 @@
+/*
+ * This file is part of libkazv.
+ * SPDX-FileCopyrightText: 2024 tusooa <tusooa@kazv.moe>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#include <libkazv-config.hpp>
+#include <iostream>
+#include <crypto.hpp>
+#include <crypto-util.hpp>
+#include <base64.hpp>
+#include <types.hpp>
+
+using namespace Kazv;
+using namespace Kazv::CryptoConstants;
+
+// This program generates a dump of olm accounts, sessions,
+// and megolm sessions. It is intended to be linked against
+// the libolm implementation of libkazvcrypto.
+//
+// The generated file is at src/tests/resources/libolm-crypto-dump .
+// It is used to test the conversion from a libolm Crypto
+// to a future vodozemac Crypto.
+
+static json convert(std::unordered_map<std::string, RandomData> seeds)
+{
+ auto res = json::object();
+ for (auto [k, v] : seeds) {
+ res[k] = encodeBase64(v);
+ }
+ return res;
+}
+
+int main()
+{
+ auto seeds = std::unordered_map<std::string, RandomData>{};
+ seeds["construct1"] = genRandomData(Crypto::constructRandomSize());
+ auto a = Crypto(RandomTag{}, seeds["construct1"]);
+
+ seeds["construct2"] = genRandomData(Crypto::constructRandomSize());
+ auto b = Crypto(RandomTag{}, seeds["construct2"]);
+
+ seeds["oneTimeKeys1"] = genRandomData(Crypto::genOneTimeKeysRandomSize(1));
+ a.genOneTimeKeysWithRandom(seeds["oneTimeKeys1"], 1);
+
+ auto k = a.unpublishedOneTimeKeys();
+ a.markOneTimeKeysAsPublished();
+
+ seeds["oneTimeKeys2"] = genRandomData(Crypto::genOneTimeKeysRandomSize(1));
+ a.genOneTimeKeysWithRandom(seeds["oneTimeKeys2"], 1);
+
+ auto oneTimeKey = k[curve25519].begin().value();
+ auto aIdKey = a.curve25519IdentityKey();
+ auto bIdKey = b.curve25519IdentityKey();
+
+ seeds["createOutbound"] = genRandomData(Crypto::createOutboundSessionRandomSize());
+ b.createOutboundSessionWithRandom(seeds["createOutbound"], aIdKey, oneTimeKey);
+
+ auto origJson = json{{"test", "mew"}};
+ seeds["encryptOlm1"] = genRandomData(Crypto::encryptOlmMaxRandomSize());
+ auto encryptedMsg = b.encryptOlmWithRandom(seeds["encryptOlm1"], origJson, aIdKey);
+ auto encJson = json{{"content", {
+ {"algorithm", olmAlgo},
+ {"ciphertext", encryptedMsg},
+ {"sender_key", b.curve25519IdentityKey()}
+ }}};
+
+ auto decryptedOpt = a.decrypt(encJson);
+
+ seeds["encryptOlm2"] = genRandomData(Crypto::encryptOlmMaxRandomSize());
+ encryptedMsg = a.encryptOlmWithRandom(seeds["encryptOlm2"], origJson, bIdKey);
+
+ decryptedOpt = b.decrypt(encJson);
+
+ seeds["rotateMegOlm1"] = genRandomData(Crypto::rotateMegOlmSessionRandomSize());
+
+ a.rotateMegOlmSessionWithRandom(seeds["rotateMegOlm1"], 0, "!foo:example.com");
+
+ auto encrypted = a.encryptMegOlm(json{
+ {"type", "m.room.message"},
+ {"room_id", "!foo:example.com"},
+ {"content", {
+ {"mew", "mew"}
+ }}
+ });
+
+ decryptedOpt = a.decrypt(json{
+ {"event_id", "$1"},
+ {"origin_server_ts", 1234},
+ {"room_id", "!foo:example.com"},
+ {"content", encrypted},
+ });
+
+ std::cout << json{
+ {"seeds", convert(seeds)},
+ {"aIdKey", aIdKey},
+ {"a", a.toJson()},
+ {"bIdKey", bIdKey},
+ {"b", b.toJson()},
+ }.dump();
+}

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