aboutsummaryrefslogtreecommitdiff
path: root/src/crypto.h
blob: 2fbf7456f8e9577f3ff085dd52730a5e31b6baa0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
#ifndef _HOTSTUFF_CRYPTO_H
#define _HOTSTUFF_CRYPTO_H

#include "salticidae/crypto.h"
#include "salticidae/ref.h"
#include "secp256k1.h"
#include <openssl/rand.h>
#include "type.h"

using salticidae::RcObj;
using salticidae::BoxObj;

namespace hotstuff {

using salticidae::SHA256;

class PubKey: public Serializable, Cloneable {
    public:
    virtual ~PubKey() = default;
    virtual PubKey *clone() override = 0;
};

using pubkey_bt = BoxObj<PubKey>;

class PrivKey: public Serializable {
    public:
    virtual ~PrivKey() = default;
    virtual pubkey_bt get_pubkey() const = 0;
    virtual void from_rand() = 0;
};

using privkey_bt = BoxObj<PrivKey>;

class PartCert: public Serializable, public Cloneable {
    public:
    virtual ~PartCert() = default;
    virtual bool verify(const PubKey &pubkey) = 0;
    virtual const uint256_t &get_blk_hash() const = 0;
    virtual PartCert *clone() override = 0;
};

class ReplicaConfig;

class QuorumCert: public Serializable, public Cloneable {
    public:
    virtual ~QuorumCert() = default;
    virtual void add_part(ReplicaID replica, const PartCert &pc) = 0;
    virtual void compute() = 0;
    virtual bool verify(const ReplicaConfig &config) = 0;
    virtual const uint256_t &get_blk_hash() const = 0;
    virtual QuorumCert *clone() override = 0;
};

using part_cert_bt = BoxObj<PartCert>;
using quorum_cert_bt = BoxObj<QuorumCert>;

class PubKeyDummy: public PubKey {
    PubKeyDummy *clone() override { return new PubKeyDummy(*this); }
    void serialize(DataStream &) const override {}
    void unserialize(DataStream &) override {}
};

class PrivKeyDummy: public PrivKey {
    pubkey_bt get_pubkey() const override { return new PubKeyDummy(); }
    void serialize(DataStream &) const override {}
    void unserialize(DataStream &) override {}
    void from_rand() override {}
};

class PartCertDummy: public PartCert {
    uint256_t blk_hash;
    public:
    PartCertDummy() {}
    PartCertDummy(const uint256_t &blk_hash):
        blk_hash(blk_hash) {}

    void serialize(DataStream &s) const override {
        s << (uint32_t)0 << blk_hash;
    }

    void unserialize(DataStream &s) override {
        uint32_t tmp;
        s >> tmp >> blk_hash;
    }

    PartCert *clone() override {
        return new PartCertDummy(blk_hash);
    }

    bool verify(const PubKey &) override { return true; }

    const uint256_t &get_blk_hash() const override { return blk_hash; }
};

class QuorumCertDummy: public QuorumCert {
    uint256_t blk_hash;
    public:
    QuorumCertDummy() {}
    QuorumCertDummy(const ReplicaConfig &, const uint256_t &blk_hash):
        blk_hash(blk_hash) {}

    void serialize(DataStream &s) const override {
        s << (uint32_t)1 << blk_hash;
    }

    void unserialize(DataStream &s) override {
        uint32_t tmp;
        s >> tmp >> blk_hash;
    }

    QuorumCert *clone() override {
        return new QuorumCertDummy(*this);
    }

    void add_part(ReplicaID, const PartCert &) override {}
    void compute() override {}
    bool verify(const ReplicaConfig &) override { return true; }

    const uint256_t &get_blk_hash() const override { return blk_hash; }
};


class Secp256k1Context {
    secp256k1_context *ctx;
    friend class PubKeySecp256k1;
    friend class SigSecp256k1;
    public:
    Secp256k1Context(bool sign = false):
        ctx(secp256k1_context_create(
            sign ? SECP256K1_CONTEXT_SIGN :
                    SECP256K1_CONTEXT_VERIFY)) {}

    Secp256k1Context(const Secp256k1Context &) = delete;

    Secp256k1Context(Secp256k1Context &&other): ctx(other.ctx) {
        other.ctx = nullptr;
    }

    ~Secp256k1Context() {
        if (ctx) secp256k1_context_destroy(ctx);
    }
};

using secp256k1_context_t = RcObj<Secp256k1Context>;

extern secp256k1_context_t secp256k1_default_sign_ctx;
extern secp256k1_context_t secp256k1_default_verify_ctx;

class PrivKeySecp256k1;

class PubKeySecp256k1: public PubKey {
    static const auto _olen = 33;
    friend class SigSecp256k1;
    secp256k1_pubkey data;
    secp256k1_context_t ctx;

    public:
    PubKeySecp256k1(const secp256k1_context_t &ctx =
                            secp256k1_default_sign_ctx):
        PubKey(), ctx(ctx) {}
    
    PubKeySecp256k1(const bytearray_t &raw_bytes,
                    const secp256k1_context_t &ctx =
                            secp256k1_default_sign_ctx):
        PubKeySecp256k1(ctx) { from_bytes(raw_bytes); }

    inline PubKeySecp256k1(const PrivKeySecp256k1 &priv_key,
                            const secp256k1_context_t &ctx =
                                    secp256k1_default_sign_ctx);

    void serialize(DataStream &s) const override {
        static uint8_t output[_olen];
        size_t olen = _olen;
        (void)secp256k1_ec_pubkey_serialize(
                ctx->ctx, (unsigned char *)output,
                &olen, &data, SECP256K1_EC_COMPRESSED);
        s.put_data(output, output + _olen);
    }

    void unserialize(DataStream &s) override {
        static const auto _exc = std::invalid_argument("ill-formed public key");
        try {
            if (!secp256k1_ec_pubkey_parse(
                    ctx->ctx, &data, s.get_data_inplace(_olen), _olen))
                throw _exc;
        } catch (std::ios_base::failure &) {
            throw _exc;
        }
    }

    PubKeySecp256k1 *clone() override {
        return new PubKeySecp256k1(*this);
    }
};

class PrivKeySecp256k1: public PrivKey {
    static const auto nbytes = 32;
    friend class PubKeySecp256k1;
    friend class SigSecp256k1;
    uint8_t data[nbytes];
    secp256k1_context_t ctx;

    public:
    PrivKeySecp256k1(const secp256k1_context_t &ctx =
                            secp256k1_default_sign_ctx):
        PrivKey(), ctx(ctx) {}

    PrivKeySecp256k1(const bytearray_t &raw_bytes,
                     const secp256k1_context_t &ctx =
                            secp256k1_default_sign_ctx):
        PrivKeySecp256k1(ctx) { from_bytes(raw_bytes); }

    void serialize(DataStream &s) const override {
        s.put_data(data, data + nbytes);
    }

    void unserialize(DataStream &s) override {
        static const auto _exc = std::invalid_argument("ill-formed private key");
        try {
            memmove(data, s.get_data_inplace(nbytes), nbytes);
        } catch (std::ios_base::failure &) {
            throw _exc;
        }
    }

    void from_rand() override {
        if (!RAND_bytes(data, nbytes))
            throw std::runtime_error("cannot get rand bytes from openssl");
    }

    inline pubkey_bt get_pubkey() const override;
};

pubkey_bt PrivKeySecp256k1::get_pubkey() const {
    return new PubKeySecp256k1(*this, ctx);
}

PubKeySecp256k1::PubKeySecp256k1(
        const PrivKeySecp256k1 &priv_key,
        const secp256k1_context_t &ctx): PubKey(), ctx(ctx) {
    if (!secp256k1_ec_pubkey_create(ctx->ctx, &data, priv_key.data))
        throw std::invalid_argument("invalid secp256k1 private key");
}

class SigSecp256k1: public Serializable {
    secp256k1_ecdsa_signature data;
    secp256k1_context_t ctx;

    void check_msg_length(const bytearray_t &msg) {
        if (msg.size() != 32)
            throw std::invalid_argument("the message should be 32-bytes");
    }

    public:
    SigSecp256k1(const secp256k1_context_t &ctx =
                        secp256k1_default_sign_ctx):
        Serializable(), ctx(ctx) {}
    SigSecp256k1(const uint256_t &digest,
                const PrivKeySecp256k1 &priv_key,
                secp256k1_context_t &ctx =
                        secp256k1_default_sign_ctx):
        Serializable(), ctx(ctx) {
        sign(digest, priv_key);
    }

    void serialize(DataStream &s) const override {
        static uint8_t output[64];
        (void)secp256k1_ecdsa_signature_serialize_compact(
            ctx->ctx, (unsigned char *)output,
            &data);
        s.put_data(output, output + 64);
    }

    void unserialize(DataStream &s) override {
        static const auto _exc = std::invalid_argument("ill-formed signature");
        try {
            if (!secp256k1_ecdsa_signature_parse_compact(
                    ctx->ctx, &data, s.get_data_inplace(64)))
                throw _exc;
        } catch (std::ios_base::failure &) {
            throw _exc;
        }
    }

    void sign(const bytearray_t &msg, const PrivKeySecp256k1 &priv_key) {
        check_msg_length(msg);
        if (!secp256k1_ecdsa_sign(
                ctx->ctx, &data,
                (unsigned char *)&*msg.begin(),
                (unsigned char *)priv_key.data,
                NULL, // default nonce function
                NULL))
            throw std::invalid_argument("failed to create secp256k1 signature");
    }

    bool verify(const bytearray_t &msg, const PubKeySecp256k1 &pub_key,
                const secp256k1_context_t &_ctx) {
        check_msg_length(msg);
        return secp256k1_ecdsa_verify(
                _ctx->ctx, &data,
                (unsigned char *)&*msg.begin(),
                &pub_key.data) == 1;
    }

    bool verify(const bytearray_t &msg, const PubKeySecp256k1 &pub_key) {
        return verify(msg, pub_key, ctx);
    }
};

class PartCertSecp256k1: public SigSecp256k1, public PartCert {
    uint256_t blk_hash;

    public:
    PartCertSecp256k1() = default;
    PartCertSecp256k1(const PrivKeySecp256k1 &priv_key, const uint256_t &blk_hash):
        SigSecp256k1(blk_hash, priv_key),
        PartCert(),
        blk_hash(blk_hash) {}

    bool verify(const PubKey &pub_key) override {
        return SigSecp256k1::verify(blk_hash,
                                    static_cast<const PubKeySecp256k1 &>(pub_key),
                                    secp256k1_default_verify_ctx);
    }

    const uint256_t &get_blk_hash() const override { return blk_hash; }

    PartCertSecp256k1 *clone() override {
        return new PartCertSecp256k1(*this);
    }

    void serialize(DataStream &s) const override {
        s << blk_hash;
        this->SigSecp256k1::serialize(s);
    }

    void unserialize(DataStream &s) override {
        s >> blk_hash;
        this->SigSecp256k1::unserialize(s);
    }
};

class QuorumCertSecp256k1: public QuorumCert {
    uint256_t blk_hash;
    salticidae::Bits rids;
    std::vector<SigSecp256k1> sigs;

    public:
    QuorumCertSecp256k1() = default;
    QuorumCertSecp256k1(const ReplicaConfig &config, const uint256_t &blk_hash);

    void add_part(ReplicaID rid, const PartCert &pc) override {
        if (pc.get_blk_hash() != blk_hash)
            throw std::invalid_argument("PartCert does match the block hash");
        if (!rids.get(rid))
        {
            rids.set(rid);
            sigs.push_back(static_cast<const PartCertSecp256k1 &>(pc));
        }
    }

    void compute() override {}

    bool verify(const ReplicaConfig &config) override;

    const uint256_t &get_blk_hash() const override { return blk_hash; }

    QuorumCertSecp256k1 *clone() override {
        return new QuorumCertSecp256k1(*this);
    }

    void serialize(DataStream &s) const override {
        s << blk_hash << rids;
        for (const auto &sig: sigs) s << sig;
    }

    void unserialize(DataStream &s) override {
        s >> blk_hash >> rids;
        sigs.resize(rids.size());
        for (auto &sig: sigs) s >> sig;
    }
};

}

#endif