forked from cheng/wallet
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
#include "stdafx.h"
|
|
using ristretto255::hash, ristretto255::hsh, ristretto255::scalar, ristretto255::point;
|
|
namespace ro {
|
|
// fasthash fails at obliterating some forms of order in its input, but
|
|
// but this is OK, because our inputs are random to start with, and
|
|
// all we care about is good mixing and dispersion of that randomness.
|
|
uint32_t fasthash(uint64_t id, std::span<const uint64_t> sp) {
|
|
static constexpr uint64_t two_to_the_64_divided_by_golden_ratio{ 11400714819323198485 };
|
|
id *= two_to_the_64_divided_by_golden_ratio;
|
|
for (auto x : sp) {
|
|
id += x;
|
|
id *= two_to_the_64_divided_by_golden_ratio; //mixes and disperses the bits.
|
|
}
|
|
return id ^ (id >> 32);
|
|
}
|
|
|
|
class charmap :public std::array<char, 0x100> {
|
|
public:
|
|
charmap() = delete;
|
|
constexpr charmap(const char* p, const char* q) {
|
|
while (unsigned int pu{ static_cast<unsigned char>(*p++) }) {
|
|
assert((*this)[pu] == 0);
|
|
(*this)[pu] = *q++;
|
|
}
|
|
assert(*(p - 1) == '\0' && *q == '\0');
|
|
}
|
|
};
|
|
|
|
//template <> class base58<scalar> : public CompileSizedString<44> {};
|
|
static_assert(sizeof(base58<point>) == 46, "base58 point strings unexpected size");
|
|
|
|
static constexpr char index2cryptoBase58[]{ "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz" };
|
|
static constexpr char index2MpirBase58[]{ "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv" };
|
|
|
|
void map_base_from_mpir58(char* p) {
|
|
static const charmap map(index2MpirBase58, index2cryptoBase58);
|
|
while (unsigned int pu{ static_cast<unsigned char>(*p) }) {
|
|
*p++ = map[pu];
|
|
}
|
|
}
|
|
|
|
void map_base_to_mpir58(const char* p, char* q, size_t count) {
|
|
static const charmap map(index2cryptoBase58, index2MpirBase58);
|
|
while (count--) {
|
|
unsigned int pu{ static_cast<unsigned char>(*p++) };
|
|
char c{ map[pu] };
|
|
if (c == '\0') throw NotBase58Exception();
|
|
*q++ = c;
|
|
}
|
|
*q = '\0';
|
|
}
|
|
|
|
// If the string does not fill the space, pushes it rightwards
|
|
// and pads with leading zeroes.
|
|
void right_justify_string(char* p, char* terminal_null) {
|
|
char* x = p;
|
|
for (; *x && x < terminal_null; x++) {
|
|
}
|
|
if (x != terminal_null) {
|
|
assert(x < terminal_null);
|
|
memmove(terminal_null - x + p, p, x - p);
|
|
memset(p, '0', terminal_null - x);
|
|
*terminal_null = '\0';
|
|
}
|
|
else assert(*terminal_null == '\0');
|
|
}
|
|
}
|