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fuzz: move MockedDescriptorConverter to fuzz/util 
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4 files changed

+123
-95
lines changed

4 files changed

+123
-95
lines changed

‎src/Makefile.test_fuzz.include‎

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Original file line numberDiff line numberDiff line change
@@ -11,6 +11,7 @@ TEST_FUZZ_H = \
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test/fuzz/fuzz.h \
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test/fuzz/FuzzedDataProvider.h \
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test/fuzz/util.h \
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test/fuzz/util/descriptor.h \
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test/fuzz/util/mempool.h \
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test/fuzz/util/net.h
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@@ -19,6 +20,7 @@ libtest_fuzz_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
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libtest_fuzz_a_SOURCES = \
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test/fuzz/fuzz.cpp \
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test/fuzz/util.cpp \
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test/fuzz/util/descriptor.cpp \
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test/fuzz/util/mempool.cpp \
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test/fuzz/util/net.cpp \
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$(TEST_FUZZ_H)

‎src/test/fuzz/descriptor_parse.cpp‎

Lines changed: 1 addition & 95 deletions
Original file line numberDiff line numberDiff line change
@@ -7,104 +7,10 @@
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#include <pubkey.h>
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#include <script/descriptor.h>
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#include <test/fuzz/fuzz.h>
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#include <test/fuzz/util/descriptor.h>
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#include <util/chaintype.h>
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#include <util/strencodings.h>
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//! Types are raw (un)compressed pubkeys, raw xonly pubkeys, raw privkeys (WIF), xpubs, xprvs.
14-
static constexpr uint8_t KEY_TYPES_COUNT{6};
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//! How many keys we'll generate in total.
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static constexpr size_t TOTAL_KEYS_GENERATED{std::numeric_limits<uint8_t>::max() + 1};
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/**
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* Converts a mocked descriptor string to a valid one. Every key in a mocked descriptor key is
20-
* represented by 2 hex characters preceded by the '%' character. We parse the two hex characters
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* as an index in a list of pre-generated keys. This list contains keys of the various types
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* accepted in descriptor keys expressions.
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*/
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class MockedDescriptorConverter {
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//! 256 keys of various types.
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std::array<std::string, TOTAL_KEYS_GENERATED> keys_str;
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public:
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// We derive the type of key to generate from the 1-byte id parsed from hex.
30-
bool IdIsCompPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 0; }
31-
bool IdIsUnCompPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 1; }
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bool IdIsXOnlyPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 2; }
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bool IdIsConstPrivKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 3; }
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bool IdIsXpub(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 4; }
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bool IdIsXprv(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 5; }
36-
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//! When initializing the target, populate the list of keys.
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void Init() {
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// The data to use as a private key or a seed for an xprv.
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std::array<std::byte, 32> key_data{std::byte{1}};
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// Generate keys of all kinds and store them in the keys array.
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for (size_t i{0}; i < TOTAL_KEYS_GENERATED; i++) {
43-
key_data[31] = std::byte(i);
44-
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// If this is a "raw" key, generate a normal privkey. Otherwise generate
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// an extended one.
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if (IdIsCompPubKey(i) || IdIsUnCompPubKey(i) || IdIsXOnlyPubKey(i) || IdIsConstPrivKey(i)) {
48-
CKey privkey;
49-
privkey.Set(UCharCast(key_data.begin()), UCharCast(key_data.end()), !IdIsUnCompPubKey(i));
50-
if (IdIsCompPubKey(i) || IdIsUnCompPubKey(i)) {
51-
CPubKey pubkey{privkey.GetPubKey()};
52-
keys_str[i] = HexStr(pubkey);
53-
} else if (IdIsXOnlyPubKey(i)) {
54-
const XOnlyPubKey pubkey{privkey.GetPubKey()};
55-
keys_str[i] = HexStr(pubkey);
56-
} else {
57-
keys_str[i] = EncodeSecret(privkey);
58-
}
59-
} else {
60-
CExtKey ext_privkey;
61-
ext_privkey.SetSeed(key_data);
62-
if (IdIsXprv(i)) {
63-
keys_str[i] = EncodeExtKey(ext_privkey);
64-
} else {
65-
const CExtPubKey ext_pubkey{ext_privkey.Neuter()};
66-
keys_str[i] = EncodeExtPubKey(ext_pubkey);
67-
}
68-
}
69-
}
70-
}
71-
72-
//! Parse an id in the keys vectors from a 2-characters hex string.
73-
std::optional<uint8_t> IdxFromHex(std::string_view hex_characters) const {
74-
if (hex_characters.size() != 2) return {};
75-
auto idx = ParseHex(hex_characters);
76-
if (idx.size() != 1) return {};
77-
return idx[0];
78-
}
79-
80-
//! Get an actual descriptor string from a descriptor string whose keys were mocked.
81-
std::optional<std::string> GetDescriptor(std::string_view mocked_desc) const {
82-
// The smallest fragment would be "pk(%00)"
83-
if (mocked_desc.size() < 7) return {};
84-
85-
// The actual descriptor string to be returned.
86-
std::string desc;
87-
desc.reserve(mocked_desc.size());
88-
89-
// Replace all occurrences of '%' followed by two hex characters with the corresponding key.
90-
for (size_t i = 0; i < mocked_desc.size();) {
91-
if (mocked_desc[i] == '%') {
92-
if (i + 3 >= mocked_desc.size()) return {};
93-
if (const auto idx = IdxFromHex(mocked_desc.substr(i + 1, 2))) {
94-
desc += keys_str[*idx];
95-
i += 3;
96-
} else {
97-
return {};
98-
}
99-
} else {
100-
desc += mocked_desc[i++];
101-
}
102-
}
103-
104-
return desc;
105-
}
106-
};
107-
10814
//! The converter of mocked descriptors, needs to be initialized when the target is.
10915
MockedDescriptorConverter MOCKED_DESC_CONVERTER;
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‎src/test/fuzz/util/descriptor.cpp‎

Lines changed: 72 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,72 @@
1+
// Copyright (c) 2023-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 <test/fuzz/util/descriptor.h>
6+
7+
void MockedDescriptorConverter::Init() {
8+
// The data to use as a private key or a seed for an xprv.
9+
std::array<std::byte, 32> key_data{std::byte{1}};
10+
// Generate keys of all kinds and store them in the keys array.
11+
for (size_t i{0}; i < TOTAL_KEYS_GENERATED; i++) {
12+
key_data[31] = std::byte(i);
13+
14+
// If this is a "raw" key, generate a normal privkey. Otherwise generate
15+
// an extended one.
16+
if (IdIsCompPubKey(i) || IdIsUnCompPubKey(i) || IdIsXOnlyPubKey(i) || IdIsConstPrivKey(i)) {
17+
CKey privkey;
18+
privkey.Set(UCharCast(key_data.begin()), UCharCast(key_data.end()), !IdIsUnCompPubKey(i));
19+
if (IdIsCompPubKey(i) || IdIsUnCompPubKey(i)) {
20+
CPubKey pubkey{privkey.GetPubKey()};
21+
keys_str[i] = HexStr(pubkey);
22+
} else if (IdIsXOnlyPubKey(i)) {
23+
const XOnlyPubKey pubkey{privkey.GetPubKey()};
24+
keys_str[i] = HexStr(pubkey);
25+
} else {
26+
keys_str[i] = EncodeSecret(privkey);
27+
}
28+
} else {
29+
CExtKey ext_privkey;
30+
ext_privkey.SetSeed(key_data);
31+
if (IdIsXprv(i)) {
32+
keys_str[i] = EncodeExtKey(ext_privkey);
33+
} else {
34+
const CExtPubKey ext_pubkey{ext_privkey.Neuter()};
35+
keys_str[i] = EncodeExtPubKey(ext_pubkey);
36+
}
37+
}
38+
}
39+
}
40+
41+
std::optional<uint8_t> MockedDescriptorConverter::IdxFromHex(std::string_view hex_characters) const {
42+
if (hex_characters.size() != 2) return {};
43+
auto idx = ParseHex(hex_characters);
44+
if (idx.size() != 1) return {};
45+
return idx[0];
46+
}
47+
48+
std::optional<std::string> MockedDescriptorConverter::GetDescriptor(std::string_view mocked_desc) const {
49+
// The smallest fragment would be "pk(%00)"
50+
if (mocked_desc.size() < 7) return {};
51+
52+
// The actual descriptor string to be returned.
53+
std::string desc;
54+
desc.reserve(mocked_desc.size());
55+
56+
// Replace all occurrences of '%' followed by two hex characters with the corresponding key.
57+
for (size_t i = 0; i < mocked_desc.size();) {
58+
if (mocked_desc[i] == '%') {
59+
if (i + 3 >= mocked_desc.size()) return {};
60+
if (const auto idx = IdxFromHex(mocked_desc.substr(i + 1, 2))) {
61+
desc += keys_str[*idx];
62+
i += 3;
63+
} else {
64+
return {};
65+
}
66+
} else {
67+
desc += mocked_desc[i++];
68+
}
69+
}
70+
71+
return desc;
72+
}

‎src/test/fuzz/util/descriptor.h‎

Lines changed: 48 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,48 @@
1+
// Copyright (c) 2023-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+
#ifndef BITCOIN_TEST_FUZZ_UTIL_DESCRIPTOR_H
6+
#define BITCOIN_TEST_FUZZ_UTIL_DESCRIPTOR_H
7+
8+
#include <key_io.h>
9+
#include <util/strencodings.h>
10+
#include <script/descriptor.h>
11+
12+
#include <functional>
13+
14+
/**
15+
* Converts a mocked descriptor string to a valid one. Every key in a mocked descriptor key is
16+
* represented by 2 hex characters preceded by the '%' character. We parse the two hex characters
17+
* as an index in a list of pre-generated keys. This list contains keys of the various types
18+
* accepted in descriptor keys expressions.
19+
*/
20+
class MockedDescriptorConverter {
21+
private:
22+
//! Types are raw (un)compressed pubkeys, raw xonly pubkeys, raw privkeys (WIF), xpubs, xprvs.
23+
static constexpr uint8_t KEY_TYPES_COUNT{6};
24+
//! How many keys we'll generate in total.
25+
static constexpr size_t TOTAL_KEYS_GENERATED{std::numeric_limits<uint8_t>::max() + 1};
26+
//! 256 keys of various types.
27+
std::array<std::string, TOTAL_KEYS_GENERATED> keys_str;
28+
29+
public:
30+
// We derive the type of key to generate from the 1-byte id parsed from hex.
31+
bool IdIsCompPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 0; }
32+
bool IdIsUnCompPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 1; }
33+
bool IdIsXOnlyPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 2; }
34+
bool IdIsConstPrivKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 3; }
35+
bool IdIsXpub(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 4; }
36+
bool IdIsXprv(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 5; }
37+
38+
//! When initializing the target, populate the list of keys.
39+
void Init();
40+
41+
//! Parse an id in the keys vectors from a 2-characters hex string.
42+
std::optional<uint8_t> IdxFromHex(std::string_view hex_characters) const;
43+
44+
//! Get an actual descriptor string from a descriptor string whose keys were mocked.
45+
std::optional<std::string> GetDescriptor(std::string_view mocked_desc) const;
46+
};
47+
48+
#endif // BITCOIN_TEST_FUZZ_UTIL_DESCRIPTOR_H

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