源代码
#include <eosiolib/crypto.h>
#include <eosiolib/asset.hpp>
#include <eosiolib/eosio.hpp>
#include <eosiolib/singleton.hpp>
#include <eosiolib/time.hpp>
#include <eosiolib/types.h>
using namespace eosio;
using namespace std;
string uint64_string(uint64_t input) {
string result;
uint8_t base = 10;
do {
char c = input % base;
input /= base;
if (c < 10)
c += '0';
else
c += 'A' - 10;
result = c + result;
} while (input);
return result;
}
uint8_t from_hex(char c) {
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
eosio_assert(false, "Invalid hex character");
return 0;
}
size_t from_hex(const string& hex_str, char* out_data, size_t out_data_len) {
auto i = hex_str.begin();
uint8_t* out_pos = (uint8_t*)out_data;
uint8_t* out_end = out_pos + out_data_len;
while (i != hex_str.end() && out_end != out_pos) {
*out_pos = from_hex((char)(*i)) << 4;
++i;
if (i != hex_str.end()) {
*out_pos |= from_hex((char)(*i));
++i;
}
++out_pos;
}
return out_pos - (uint8_t*)out_data;
}
string to_hex(const char* d, uint32_t s) {
std::string r;
const char* to_hex = "0123456789abcdef";
uint8_t* c = (uint8_t*)d;
for (uint32_t i = 0; i < s; ++i)
(r += to_hex[(c[i] >> 4)]) += to_hex[(c[i] & 0x0f)];
return r;
}
string sha256_to_hex(const capi_checksum256& sha256) {
return to_hex((char*)sha256.hash, sizeof(sha256.hash));
}
string sha1_to_hex(const capi_checksum160& sha1) {
return to_hex((char*)sha1.hash, sizeof(sha1.hash));
}
// copied from boost https://www.boost.org/
template <class T>
inline void hash_combine(std::size_t& seed, const T& v) {
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
uint64_t uint64_hash(const string& hash) {
return std::hash<string>{}(hash);
}
uint64_t uint64_hash(const capi_checksum256& hash) {
return uint64_hash(sha256_to_hex(hash));
}
capi_checksum256 hex_to_sha256(const string& hex_str) {
eosio_assert(hex_str.length() == 64, "invalid sha256");
capi_checksum256 checksum;
from_hex(hex_str, (char*)checksum.hash, sizeof(checksum.hash));
return checksum;
}
capi_checksum160 hex_to_sha1(const string& hex_str) {
eosio_assert(hex_str.length() == 40, "invalid sha1");
capi_checksum160 checksum;
from_hex(hex_str, (char*)checksum.hash, sizeof(checksum.hash));
return checksum;
}
size_t sub2sep(const string& input,
string* output,
const char& separator,
const size_t& first_pos = 0,
const bool& required = false) {
eosio_assert(first_pos != string::npos, "invalid first pos");
auto pos = input.find(separator, first_pos);
if (pos == string::npos) {
eosio_assert(!required, "parse memo error");
return string::npos;
}
*output = input.substr(first_pos, pos - first_pos);
return pos;
}
// Copied from https://github.com/bitcoin/bitcoin
/** All alphanumeric characters except for "0", "I", "O", and "l" */
static const char* pszBase58 =
"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
static const int8_t mapBase58[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7,
8, -1, -1, -1, -1, -1, -1, -1, 9, 10, 11, 12, 13, 14, 15, 16, -1, 17, 18,
19, 20, 21, -1, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, -1, -1, -1, -1,
-1, -1, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, -1, 44, 45, 46, 47, 48,
49, 50, 51, 52, 53, 54, 55, 56, 57, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1,
};
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.
static_assert(
sizeof(mapBase58) / sizeof(mapBase58[0]) == 256,
"mapBase58.size() should be 256"); // guarantee not out of range
while (*psz && !isspace(*psz)) {
// Decode base58 character
int carry = mapBase58[(uint8_t)*psz];
if (carry == -1) // Invalid b58 character
return false;
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;
}
bool decode_base58(const string& str, vector<unsigned char>& vch) {
return DecodeBase58(str.c_str(), vch);
}
// Copied from https://github.com/bitcoin/bitcoin
capi_signature str_to_sig(const string& sig, const bool& checksumming = true) {
const auto pivot = sig.find('_');
eosio_assert(pivot != string::npos, "No delimiter in signature");
const auto prefix_str = sig.substr(0, pivot);
eosio_assert(prefix_str == "SIG", "Signature Key has invalid prefix");
const auto next_pivot = sig.find('_', pivot + 1);
eosio_assert(next_pivot != string::npos, "No curve in signature");
const auto curve = sig.substr(pivot + 1, next_pivot - pivot - 1);
eosio_assert(curve == "K1" || curve == "R1", "Incorrect curve");
const bool k1 = curve == "K1";
auto data_str = sig.substr(next_pivot + 1);
eosio_assert(!data_str.empty(), "Signature has no data");
vector<unsigned char> vch;
eosio_assert(decode_base58(data_str, vch), "Decode signature failed");
eosio_assert(vch.size() == 69, "Invalid signature");
if (checksumming) {
array<unsigned char, 67> check_data;
copy_n(vch.begin(), 65, check_data.begin());
check_data[65] = k1 ? 'K' : 'R';
check_data[66] = '1';
capi_checksum160 check_sig;
ripemd160(reinterpret_cast<char*>(check_data.data()), 67, &check_sig);
eosio_assert(memcmp(&check_sig.hash, &vch.end()[-4], 4) == 0, "Signature checksum mismatch");
}
capi_signature _sig;
unsigned int type = k1 ? 0 : 1;
_sig.data[0] = (uint8_t)type;
for (int i = 1; i < sizeof(_sig.data); i++) {
_sig.data[i] = vch[i - 1];
}
return _sig;
}
capi_public_key str_to_pub(const string& pubkey, const bool& checksumming = true) {
string pubkey_prefix("EOS");
auto base58substr = pubkey.substr(pubkey_prefix.length());
vector<unsigned char> vch;
eosio_assert(decode_base58(base58substr, vch), "Decode public key failed");
eosio_assert(vch.size() == 37, "Invalid public key");
if (checksumming) {
array<unsigned char, 33> pubkey_data;
copy_n(vch.begin(), 33, pubkey_data.begin());
capi_checksum160 check_pubkey;
ripemd160(reinterpret_cast<char*>(pubkey_data.data()), 33, &check_pubkey);
eosio_assert(memcmp(&check_pubkey, &vch.end()[-4], 4) == 0, "Public key checksum mismatch");
}
capi_public_key _pub_key;
unsigned int type = 0;
_pub_key.data[0] = (char)type;
for (int i = 1; i < sizeof(_pub_key.data); i++) {
_pub_key.data[i] = vch[i - 1];
}
return _pub_key;
}
测试
ACTION test()
{
capi_checksum256 digest = hex_to_sha256("9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
capi_signature sig = str_to_sig("SIG_K1_KkSbKuDSV7x87FeexJ3goinHsd3MhPBCH91MRqhyS3Z7H1v4HtUZoJc6AkgYWW5mEan7UbdmDAzDpCzUwheDPxRxtzuD8s");
capi_public_key pk = str_to_pub("EOS62M5kVouCEU31xP736Txb4pe82FoncprqevPuagE6boCLxwsC8");
assert_recover_key(&digest, (const char *)&sig, sizeof(sig), (const char *)&pk, sizeof(pk));
print("VALID");
}
参考
