aboutsummaryrefslogtreecommitdiff
path: root/src/base58.cpp
blob: efa1beb1e4f7c908f23b8f34161494287c3555d6 (plain)
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
// Copyright (c) 2014-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "base58.h"

#include "hash.h"
#include "uint256.h"

#include <assert.h>
#include <stdint.h>
#include <string.h>
#include <vector>
#include <string>
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>

/** All alphanumeric characters except for "0", "I", "O", and "l" */
static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";

bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch)
{
    // Skip leading spaces.
    while (*psz && isspace(*psz))
        psz++;
    // Skip and count leading '1's.
    int zeroes = 0;
    int length = 0;
    while (*psz == '1') {
        zeroes++;
        psz++;
    }
    // Allocate enough space in big-endian base256 representation.
    int size = strlen(psz) * 733 /1000 + 1; // log(58) / log(256), rounded up.
    std::vector<unsigned char> b256(size);
    // Process the characters.
    while (*psz && !isspace(*psz)) {
        // Decode base58 character
        const char* ch = strchr(pszBase58, *psz);
        if (ch == NULL)
            return false;
        // Apply "b256 = b256 * 58 + ch".
        int carry = ch - pszBase58;
        int i = 0;
        for (std::vector<unsigned char>::reverse_iterator it = b256.rbegin(); (carry != 0 || i < length) && (it != b256.rend()); ++it, ++i) {
            carry += 58 * (*it);
            *it = carry % 256;
            carry /= 256;
        }
        assert(carry == 0);
        length = i;
        psz++;
    }
    // Skip trailing spaces.
    while (isspace(*psz))
        psz++;
    if (*psz != 0)
        return false;
    // Skip leading zeroes in b256.
    std::vector<unsigned char>::iterator it = b256.begin() + (size - length);
    while (it != b256.end() && *it == 0)
        it++;
    // Copy result into output vector.
    vch.reserve(zeroes + (b256.end() - it));
    vch.assign(zeroes, 0x00);
    while (it != b256.end())
        vch.push_back(*(it++));
    return true;
}

std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
{
    // Skip & count leading zeroes.
    int zeroes = 0;
    int length = 0;
    while (pbegin != pend && *pbegin == 0) {
        pbegin++;
        zeroes++;
    }
    // Allocate enough space in big-endian base58 representation.
    int size = (pend - pbegin) * 138 / 100 + 1; // log(256) / log(58), rounded up.
    std::vector<unsigned char> b58(size);
    // Process the bytes.
    while (pbegin != pend) {
        int carry = *pbegin;
        int i = 0;
        // Apply "b58 = b58 * 256 + ch".
        for (std::vector<unsigned char>::reverse_iterator it = b58.rbegin(); (carry != 0 || i < length) && (it != b58.rend()); it++, i++) {
            carry += 256 * (*it);
            *it = carry % 58;
            carry /= 58;
        }

        assert(carry == 0);
        length = i;
        pbegin++;
    }
    // Skip leading zeroes in base58 result.
    std::vector<unsigned char>::iterator it = b58.begin() + (size - length);
    while (it != b58.end() && *it == 0)
        it++;
    // Translate the result into a string.
    std::string str;
    str.reserve(zeroes + (b58.end() - it));
    str.assign(zeroes, '1');
    while (it != b58.end())
        str += pszBase58[*(it++)];
    return str;
}

std::string EncodeBase58(const std::vector<unsigned char>& vch)
{
    return EncodeBase58(&vch[0], &vch[0] + vch.size());
}

bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet)
{
    return DecodeBase58(str.c_str(), vchRet);
}

std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn)
{
    // add 4-byte hash check to the end
    std::vector<unsigned char> vch(vchIn);
    uint256 hash = Hash(vch.begin(), vch.end());
    vch.insert(vch.end(), (unsigned char*)&hash, (unsigned char*)&hash + 4);
    return EncodeBase58(vch);
}

bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet)
{
    if (!DecodeBase58(psz, vchRet) ||
        (vchRet.size() < 4)) {
        vchRet.clear();
        return false;
    }
    // re-calculate the checksum, ensure it matches the included 4-byte checksum
    uint256 hash = Hash(vchRet.begin(), vchRet.end() - 4);
    if (memcmp(&hash, &vchRet.end()[-4], 4) != 0) {
        vchRet.clear();
        return false;
    }
    vchRet.resize(vchRet.size() - 4);
    return true;
}

bool DecodeBase58Check(const std::string& str, std::vector<unsigned char>& vchRet)
{
    return DecodeBase58Check(str.c_str(), vchRet);
}

CBase58Data::CBase58Data()
{
    vchVersion.clear();
    vchData.clear();
}

void CBase58Data::SetData(const std::vector<unsigned char>& vchVersionIn, const void* pdata, size_t nSize)
{
    vchVersion = vchVersionIn;
    vchData.resize(nSize);
    if (!vchData.empty())
        memcpy(&vchData[0], pdata, nSize);
}

void CBase58Data::SetData(const std::vector<unsigned char>& vchVersionIn, const unsigned char* pbegin, const unsigned char* pend)
{
    SetData(vchVersionIn, (void*)pbegin, pend - pbegin);
}

bool CBase58Data::SetString(const char* psz, unsigned int nVersionBytes)
{
    std::vector<unsigned char> vchTemp;
    bool rc58 = DecodeBase58Check(psz, vchTemp);
    if ((!rc58) || (vchTemp.size() < nVersionBytes)) {
        vchData.clear();
        vchVersion.clear();
        return false;
    }
    vchVersion.assign(vchTemp.begin(), vchTemp.begin() + nVersionBytes);
    vchData.resize(vchTemp.size() - nVersionBytes);
    if (!vchData.empty())
        memcpy(&vchData[0], &vchTemp[nVersionBytes], vchData.size());
    memory_cleanse(&vchTemp[0], vchTemp.size());
    return true;
}

bool CBase58Data::SetString(const std::string& str)
{
    return SetString(str.c_str());
}

std::string CBase58Data::ToString() const
{
    std::vector<unsigned char> vch = vchVersion;
    vch.insert(vch.end(), vchData.begin(), vchData.end());
    return EncodeBase58Check(vch);
}

int CBase58Data::CompareTo(const CBase58Data& b58) const
{
    if (vchVersion < b58.vchVersion)
        return -1;
    if (vchVersion > b58.vchVersion)
        return 1;
    if (vchData < b58.vchData)
        return -1;
    if (vchData > b58.vchData)
        return 1;
    return 0;
}

namespace
{
class CBitcoinAddressVisitor : public boost::static_visitor<bool>
{
private:
    CBitcoinAddress* addr;

public:
    CBitcoinAddressVisitor(CBitcoinAddress* addrIn) : addr(addrIn) {}

    bool operator()(const CKeyID& id) const { return addr->Set(id); }
    bool operator()(const CScriptID& id) const { return addr->Set(id); }
    bool operator()(const CNoDestination& no) const { return false; }
};

} // namespace

bool CBitcoinAddress::Set(const CKeyID& id)
{
    SetData(Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS), &id, 20);
    return true;
}

bool CBitcoinAddress::Set(const CScriptID& id)
{
    SetData(Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS), &id, 20);
    return true;
}

bool CBitcoinAddress::Set(const CTxDestination& dest)
{
    return boost::apply_visitor(CBitcoinAddressVisitor(this), dest);
}

bool CBitcoinAddress::IsValid() const
{
    return IsValid(Params());
}

bool CBitcoinAddress::IsValid(const CChainParams& params) const
{
    bool fCorrectSize = vchData.size() == 20;
    bool fKnownVersion = vchVersion == params.Base58Prefix(CChainParams::PUBKEY_ADDRESS) ||
                         vchVersion == params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
    return fCorrectSize && fKnownVersion;
}

CTxDestination CBitcoinAddress::Get() const
{
    if (!IsValid())
        return CNoDestination();
    uint160 id;
    memcpy(&id, &vchData[0], 20);
    if (vchVersion == Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
        return CKeyID(id);
    else if (vchVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS))
        return CScriptID(id);
    else
        return CNoDestination();
}

bool CBitcoinAddress::GetKeyID(CKeyID& keyID) const
{
    if (!IsValid() || vchVersion != Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
        return false;
    uint160 id;
    memcpy(&id, &vchData[0], 20);
    keyID = CKeyID(id);
    return true;
}

bool CBitcoinAddress::IsScript() const
{
    return IsValid() && vchVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS);
}

void CBitcoinSecret::SetKey(const CKey& vchSecret)
{
    assert(vchSecret.IsValid());
    SetData(Params().Base58Prefix(CChainParams::SECRET_KEY), vchSecret.begin(), vchSecret.size());
    if (vchSecret.IsCompressed())
        vchData.push_back(1);
}

CKey CBitcoinSecret::GetKey()
{
    CKey ret;
    assert(vchData.size() >= 32);
    ret.Set(vchData.begin(), vchData.begin() + 32, vchData.size() > 32 && vchData[32] == 1);
    return ret;
}

bool CBitcoinSecret::IsValid() const
{
    bool fExpectedFormat = vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1);
    bool fCorrectVersion = vchVersion == Params().Base58Prefix(CChainParams::SECRET_KEY);
    return fExpectedFormat && fCorrectVersion;
}

bool CBitcoinSecret::SetString(const char* pszSecret)
{
    return CBase58Data::SetString(pszSecret) && IsValid();
}

bool CBitcoinSecret::SetString(const std::string& strSecret)
{
    return SetString(strSecret.c_str());
}