EOS 智能合约 plublic key 转换
在做一个EOS 的action接口时,定义如下:
void setbplist(const account_name bp_name, const uint64_t bp_time, const std::string hash_bplist, const std::vector< uosio::producer_key >& bplist);
其中有一个结构uosio::producer_key,它在合约的结构中是如下定义:
struct /* */producer_key {
account_name producer_name;
public_key block_signing_key;
friend bool operator < ( const producer_key& a, const producer_key& b ) {
return a.producer_name < b.producer_name;
}
UOSLIB_SERIALIZE( producer_key, (producer_name)(block_signing_key))
};
其中 public_key 定义如下:
struct public_key {
unsigned_int type;
std::array<char,33> data;
friend bool operator == ( const public_key& a, const public_key& b ) {
return std::tie(a.type,a.data) == std::tie(b.type,b.data);
}
friend bool operator != ( const public_key& a, const public_key& b ) {
return std::tie(a.type,a.data) != std::tie(b.type,b.data);
}
UOSLIB_SERIALIZE( public_key, (type)(data) )
};
这里的 public_key 是一个压缩成33个字节的数据,但其实我传的是 一组公匙,我想在智能合约里还原成公匙的形态。EOS公匙是基于base58编码,这个与比特币的一致,这里不再详述了。
下面下面是我的代码:
std::string system_contract::get_public_key_from_array(const char* pub, const int len) {
std::string result;
checksum160 ck;
ripemd160(pub, len, &ck);
std::vector<unsigned char> vec;
for(int i = 0; i < len; ++i) {
vec.push_back(pub[i]);
}
for(int i = 0; i < 4; ++i ) {
vec.push_back(ck.hash[i]);
}
result = "UOS" + EncodeBase58(vec);
print("result: ", result, "\n");
return result;
}
std::string system_contract::EncodeBase58(const std::vector<unsigned char>& vch)
{
return EncodeBase58(vch.data(), vch.data() + vch.size());
}
std::string system_contract::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;
}
我的合约里调用此接口的部分代码:

接口的调用:
cluos -u http://10.186.11.112:8000 push action uosio setbplist '{"bp_name":"marsaccount3","bp_time":"1553685636", "hash_bplist":"9d3329c56e7e6f6068f7dbd905f4b99ffa86ba53897c2a399f5d3637ade41c9a", "bplist":[{"producer_name":"marsaccount3", "block_signing_key":"UOS6aWfdf6tHWCepZpP6MzdynuNMAkNKr6nbNMguTuCatq88LyG4G"},{"producer_name":"dragonexsafe", "block_signing_key":"UOS7DVNg9bsq1zUZtUbWwA1UyhaqFBmNrCRVnPFeGYgsx7kzfAtiC"},{"producer_name":"uosvegasjack", "block_signing_key":"UOS5aTdkbRaPH5WKYPJaxX8HfqGtX8hKx8p6FDPAzpkyJiYnuBu5c"}]}' -x 2000 -p marsaccount3@active
可以看到我的三个公匙是:
UOS6aWfdf6tHWCepZpP6MzdynuNMAkNKr6nbNMguTuCatq88LyG4G
UOS7DVNg9bsq1zUZtUbWwA1UyhaqFBmNrCRVnPFeGYgsx7kzfAtiC
UOS5aTdkbRaPH5WKYPJaxX8HfqGtX8hKx8p6FDPAzpkyJiYnuBu5c
但实际到了EOS合约里面,已经被处理过了,像第一个公匙 UOS6aWfdf6tHWCepZpP6MzdynuNMAkNKr6nbNMguTuCatq88LyG4G 在传到合约里对应的就是33个字节的数据,以十六进制打印出来就是 02de9288d61afea6084227b2db9449fd58986652bcda91a4efeeac3ef0ee4ad80c
通过以上的接口就还原公匙的原型了。
参考来源:https://www.liaoxuefeng.com/article/001523444489789210f7acb0355485d91cfb1a44788ac9b000

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