/Users/eugenesiegel/btc/bitcoin/src/musig.cpp
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1 | | // Copyright (c) 2024-present The Bitcoin Core developers |
2 | | // Distributed under the MIT software license, see the accompanying |
3 | | // file COPYING or http://www.opensource.org/licenses/mit-license.php. |
4 | | |
5 | | #include <musig.h> |
6 | | |
7 | | #include <secp256k1_musig.h> |
8 | | |
9 | | bool GetMuSig2KeyAggCache(const std::vector<CPubKey>& pubkeys, secp256k1_musig_keyagg_cache& keyagg_cache) |
10 | 0 | { |
11 | | // Parse the pubkeys |
12 | 0 | std::vector<secp256k1_pubkey> secp_pubkeys; |
13 | 0 | std::vector<const secp256k1_pubkey*> pubkey_ptrs; |
14 | 0 | for (const CPubKey& pubkey : pubkeys) { |
15 | 0 | if (!secp256k1_ec_pubkey_parse(secp256k1_context_static, &secp_pubkeys.emplace_back(), pubkey.data(), pubkey.size())) { |
16 | 0 | return false; |
17 | 0 | } |
18 | 0 | } |
19 | 0 | pubkey_ptrs.reserve(secp_pubkeys.size()); |
20 | 0 | for (const secp256k1_pubkey& p : secp_pubkeys) { |
21 | 0 | pubkey_ptrs.push_back(&p); |
22 | 0 | } |
23 | | |
24 | | // Aggregate the pubkey |
25 | 0 | if (!secp256k1_musig_pubkey_agg(secp256k1_context_static, nullptr, &keyagg_cache, pubkey_ptrs.data(), pubkey_ptrs.size())) { |
26 | 0 | return false; |
27 | 0 | } |
28 | 0 | return true; |
29 | 0 | } |
30 | | |
31 | | std::optional<CPubKey> GetCPubKeyFromMuSig2KeyAggCache(secp256k1_musig_keyagg_cache& keyagg_cache) |
32 | 0 | { |
33 | | // Get the plain aggregated pubkey |
34 | 0 | secp256k1_pubkey agg_pubkey; |
35 | 0 | if (!secp256k1_musig_pubkey_get(secp256k1_context_static, &agg_pubkey, &keyagg_cache)) { |
36 | 0 | return std::nullopt; |
37 | 0 | } |
38 | | |
39 | | // Turn into CPubKey |
40 | 0 | unsigned char ser_agg_pubkey[CPubKey::COMPRESSED_SIZE]; |
41 | 0 | size_t ser_agg_pubkey_len = CPubKey::COMPRESSED_SIZE; |
42 | 0 | secp256k1_ec_pubkey_serialize(secp256k1_context_static, ser_agg_pubkey, &ser_agg_pubkey_len, &agg_pubkey, SECP256K1_EC_COMPRESSED); Line | Count | Source | 224 | 0 | #define SECP256K1_EC_COMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION | SECP256K1_FLAGS_BIT_COMPRESSION) Line | Count | Source | 205 | 0 | #define SECP256K1_FLAGS_TYPE_COMPRESSION (1 << 1) |
| #define SECP256K1_EC_COMPRESSED (SECP256K1_FLAGS_TYPE_COMPRESSION | SECP256K1_FLAGS_BIT_COMPRESSION) Line | Count | Source | 210 | 0 | #define SECP256K1_FLAGS_BIT_COMPRESSION (1 << 8) |
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43 | 0 | return CPubKey(ser_agg_pubkey, ser_agg_pubkey + ser_agg_pubkey_len); |
44 | 0 | } |
45 | | |
46 | | std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkeys) |
47 | 0 | { |
48 | 0 | secp256k1_musig_keyagg_cache keyagg_cache; |
49 | 0 | if (!GetMuSig2KeyAggCache(pubkeys, keyagg_cache)) { |
50 | 0 | return std::nullopt; |
51 | 0 | } |
52 | 0 | return GetCPubKeyFromMuSig2KeyAggCache(keyagg_cache); |
53 | 0 | } |