BLSCrypto.cpp

/*
    Copyright (C) 2019-Present SKALE Labs

    This file is part of sgxwallet.

    sgxwallet is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    sgxwallet is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with sgxwallet.  If not, see <https://www.gnu.org/licenses/>.

    @file BLSCrypto.cpp
    @author Stan Kladko
    @date 2019
*/

#include <memory>


#include "libff/algebra/curves/alt_bn128/alt_bn128_init.hpp"

#include "bls.h"


#include "leveldb/db.h"
#include <jsonrpccpp/server/connectors/httpserver.h>
#include "BLSPrivateKeyShareSGX.h"


#include "sgxwallet_common.h"
#include "create_enclave.h"
#include "secure_enclave_u.h"
#include "sgx_detect.h"
#include <gmp.h>
#include <sgx_urts.h>

#include "sgxwallet.h"

#include "SGXWalletServer.h"

#include "BLSCrypto.h"
#include "ServerInit.h"

#include "RPCException.h"

#include "spdlog/spdlog.h"

int char2int(char _input) {
  if (_input >= '0' && _input <= '9')
    return _input - '0';
  if (_input >= 'A' && _input <= 'F')
    return _input - 'A' + 10;
  if (_input >= 'a' && _input <= 'f')
    return _input - 'a' + 10;
  return -1;
}



void  carray2Hex(const unsigned char *d, int _len, char* _hexArray) {

  char hexval[16] = {'0', '1', '2', '3', '4', '5', '6', '7',
                     '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

  for (int j = 0; j < _len; j++) {
    _hexArray[j * 2] = hexval[((d[j] >> 4) & 0xF)];
    _hexArray[j * 2 + 1] = hexval[(d[j]) & 0x0F];
  }

  _hexArray[_len * 2] = 0;

}


bool hex2carray(const char * _hex, uint64_t  *_bin_len,
                uint8_t* _bin ) {

  int len = strnlen(_hex, 2 * BUF_LEN);


  if (len == 0 && len % 2 == 1)
    return false;

  *_bin_len = len / 2;

  for (int i = 0; i < len / 2; i++) {
    int high = char2int((char)_hex[i * 2]);
    int low = char2int((char)_hex[i * 2 + 1]);

    if (high < 0 || low < 0) {
      return false;
    }

    _bin[i] = (unsigned char) (high * 16 + low);
  }

  return true;

}

bool hex2carray2(const char * _hex, uint64_t  *_bin_len,
                uint8_t* _bin, const int _max_length ) {

    int len = strnlen(_hex, _max_length);//2 * BUF_LEN);


    if (len == 0 && len % 2 == 1)
        return false;

    *_bin_len = len / 2;

    for (int i = 0; i < len / 2; i++) {
        int high = char2int((char)_hex[i * 2]);
        int low = char2int((char)_hex[i * 2 + 1]);

        if (high < 0 || low < 0) {
            return false;
        }

        _bin[i] = (unsigned char) (high * 16 + low);
    }

    return true;

}


bool sign(const char* _encryptedKeyHex, const char* _hashHex, size_t _t, size_t _n, size_t _signerIndex,
    char* _sig) {

  //std::cerr << "ENTER SIGN" << std::endl;

  auto keyStr = std::make_shared<std::string>(_encryptedKeyHex);

  auto hash = std::make_shared<std::array<uint8_t, 32>>();

  uint64_t binLen;

  if (!hex2carray(_hashHex, &binLen, hash->data())){
      throw RPCException(INVALID_HEX, "Invalid hash");
  }
 // assert(binLen == hash->size());



  auto keyShare = std::make_shared<BLSPrivateKeyShareSGX>(keyStr, _t, _n);

  //std::cerr << "keyShare created" << std::endl;
 // {
    auto sigShare = keyShare->signWithHelperSGX(hash, _signerIndex);
 // }

  auto sigShareStr = sigShare->toString();

  strncpy(_sig, sigShareStr->c_str(), BUF_LEN);

  //std::string sigShareStr = keyShare->signWithHelperSGXstr(hash, _signerIndex);
  //strncpy(_sig, sigShareStr.c_str(), BUF_LEN);

 // std::string test_sig = "8175162913343900215959836578795929492705714455632345516427532159927644835012:15265825550804683171644566522808807137117748565649051208189914766494241035855:9810286616503120081238481858289626967170509983220853777870754480048381194141:5";
 // auto sig_ptr = std::make_shared<std::string>(test_sig);
 // strncpy(_sig, sig_ptr->c_str(), BUF_LEN);

  //std::cerr<< "sig " << _sig <<std::endl;

  return true;

}


char *encryptBLSKeyShare2Hex(int *errStatus, char *err_string, const char *_key) {
    char *keyArray = (char *) calloc(BUF_LEN, 1);
    uint8_t *encryptedKey = (uint8_t *) calloc(BUF_LEN, 1);
    char *errMsg = (char *) calloc(BUF_LEN, 1);
    strncpy((char *) keyArray, (char *) _key, BUF_LEN);

    *errStatus = -1;

    unsigned int encryptedLen = 0;

    status = encrypt_key(eid, errStatus, errMsg, keyArray, encryptedKey, &encryptedLen);

    if (DEBUG_PRINT) {
      spdlog::info("errStatus is {}",*errStatus, " errMsg is ", errMsg );
    }

    if (status != SGX_SUCCESS) {

        *errStatus = -1;
        return nullptr;
    }

    if (*errStatus != 0) {
        throw RPCException(-666, errMsg);
    }


    char *result = (char *) calloc(2 * BUF_LEN, 1);

    carray2Hex(encryptedKey, encryptedLen, result);

    return result;
}

char *decryptBLSKeyShareFromHex(int *errStatus, char *errMsg, const char *_encryptedKey) {


    *errStatus = -1;

    uint64_t decodedLen = 0;

    uint8_t decoded[BUF_LEN];

    if (!(hex2carray(_encryptedKey, &decodedLen, decoded))) {
        return nullptr;
    }

    char *plaintextKey = (char *) calloc(BUF_LEN, 1);

    status = decrypt_key(eid, errStatus, errMsg, decoded, decodedLen, plaintextKey);

    if (status != SGX_SUCCESS) {
        return nullptr;
    }

    if (*errStatus != 0) {
        return nullptr;
    }

    return plaintextKey;

}