7#include <botan/base58.h>
8#include <botan/exceptn.h>
9#include <botan/bigint.h>
10#include <botan/divide.h>
11#include <botan/loadstor.h>
12#include <botan/internal/ct_utils.h>
13#include <botan/hash.h>
19uint32_t sha256_d_checksum(
const uint8_t input[],
size_t input_length)
23 std::vector<uint8_t> checksum(32);
25 sha256->update(input, input_length);
26 sha256->final(checksum);
28 sha256->update(checksum);
29 sha256->final(checksum);
34char lookup_base58_char(uint8_t x)
46 const char c_19 =
'1' + x;
47 const char c_AH =
'A' + (x - 9);
48 const char c_JN =
'J' + (x - 17);
49 const char c_PZ =
'P' + (x - 22);
50 const char c_ak =
'a' + (x - 33);
51 const char c_mz =
'm' + (x - 44);
54 ret = is_dec_19.select(c_19, ret);
55 ret = is_alpha_AH.select(c_AH, ret);
56 ret = is_alpha_JN.select(c_JN, ret);
57 ret = is_alpha_PZ.select(c_PZ, ret);
58 ret = is_alpha_ak.select(c_ak, ret);
65 const uint8_t radix = 58;
74 result.push_back(lookup_base58_char(r));
78 for(
size_t i = 0; i != leading_zeros; ++i)
79 result.push_back(
'1');
81 return std::string(result.rbegin(), result.rend());
84template<
typename T,
typename Z>
85size_t count_leading_zeros(
const T input[],
size_t input_length,
Z zero)
87 size_t leading_zeros = 0;
89 while(leading_zeros < input_length && input[leading_zeros] == zero)
95uint8_t base58_value_of(
char input)
99 const uint8_t c =
static_cast<uint8_t
>(input);
109 const uint8_t c_dec_19 = c - uint8_t(
'1');
110 const uint8_t c_AH = c - uint8_t(
'A') + 9;
111 const uint8_t c_JN = c - uint8_t(
'J') + 17;
112 const uint8_t c_PZ = c - uint8_t(
'P') + 22;
114 const uint8_t c_ak = c - uint8_t(
'a') + 33;
115 const uint8_t c_mz = c - uint8_t(
'm') + 44;
119 ret = is_dec_19.select(c_dec_19, ret);
120 ret = is_alpha_AH.select(c_AH, ret);
121 ret = is_alpha_JN.select(c_JN, ret);
122 ret = is_alpha_PZ.select(c_PZ, ret);
123 ret = is_alpha_ak.select(c_ak, ret);
124 ret = is_alpha_mz.select(c_mz, ret);
132 BigInt v(input, input_length);
133 return base58_encode(v, count_leading_zeros(input, input_length, 0));
138 BigInt v(input, input_length);
140 v += sha256_d_checksum(input, input_length);
141 return base58_encode(v, count_leading_zeros(input, input_length, 0));
146 const size_t leading_zeros = count_leading_zeros(input, input_length,
'1');
150 for(
size_t i = leading_zeros; i != input_length; ++i)
152 const char c = input[i];
154 if(c ==
' ' || c ==
'\n')
157 const uint8_t idx = base58_value_of(c);
166 std::vector<uint8_t> output(v.
bytes() + leading_zeros);
173 std::vector<uint8_t> dec =
base58_decode(input, input_length);
178 const uint32_t computed_checksum = sha256_d_checksum(dec.data(), dec.size() - 4);
181 if(checksum != computed_checksum)
184 dec.resize(dec.size() - 4);
#define BOTAN_DEBUG_ASSERT(expr)
void binary_encode(uint8_t buf[]) const
static Mask< T > is_within_range(T v, T l, T u)
static Mask< T > is_lte(T x, T y)
static std::unique_ptr< HashFunction > create_or_throw(const std::string &algo_spec, const std::string &provider="")
std::vector< uint8_t > base58_check_decode(const char input[], size_t input_length)
void ct_divide_u8(const BigInt &x, uint8_t y, BigInt &q_out, uint8_t &r_out)
std::string base58_encode(const uint8_t input[], size_t input_length)
uint32_t load_be< uint32_t >(const uint8_t in[], size_t off)
std::string base58_check_encode(const uint8_t input[], size_t input_length)
std::vector< uint8_t > base58_decode(const char input[], size_t input_length)