RFC6979_HMAC_SHA256::RFC6979_HMAC_SHA256(const unsigned char* key, size_t keylen, const unsigned char* msg, size_t msglen) : retry(false)
{
memset(V, 0x01, sizeof(V));
memset(K, 0x00, sizeof(K));
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(zero, sizeof(zero)).Write(key, keylen).Write(msg, msglen).Finalize(K);
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V);
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(one, sizeof(one)).Write(key, keylen).Write(msg, msglen).Finalize(K);
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V);
}
void RFC6979_HMAC_SHA256::Generate(unsigned char* output, size_t outputlen)
{
if (retry) {
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(zero, sizeof(zero)).Finalize(K);
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V);
}
while (outputlen > 0) {
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V);
size_t len = std::min(outputlen, sizeof(V));
memcpy(output, V, len);
output += len;
outputlen -= len;
}
retry = true;
}
//This function checks username and password against -rpcauth
//entries from config file.
static bool multiUserAuthorized(std::string strUserPass)
{
if (strUserPass.find(":") == std::string::npos) {
return false;
}
std::string strUser = strUserPass.substr(0, strUserPass.find(":"));
std::string strPass = strUserPass.substr(strUserPass.find(":") + 1);
if (gArgs.IsArgSet("-rpcauth")) {
//Search for multi-user login/pass "rpcauth" from config
for (std::string strRPCAuth : gArgs.GetArgs("-rpcauth"))
{
std::vector<std::string> vFields;
boost::split(vFields, strRPCAuth, boost::is_any_of(":$"));
if (vFields.size() != 3) {
//Incorrect formatting in config file
continue;
}
std::string strName = vFields[0];
if (!TimingResistantEqual(strName, strUser)) {
continue;
}
std::string strSalt = vFields[1];
std::string strHash = vFields[2];
static const unsigned int KEY_SIZE = 32;
unsigned char out[KEY_SIZE];
CHMAC_SHA256(reinterpret_cast<const unsigned char*>(strSalt.c_str()), strSalt.size()).Write(reinterpret_cast<const unsigned char*>(strPass.c_str()), strPass.size()).Finalize(out);
std::vector<unsigned char> hexvec(out, out+KEY_SIZE);
std::string strHashFromPass = HexStr(hexvec);
if (TimingResistantEqual(strHashFromPass, strHash)) {
return true;
}
}
}
return false;
}
void TestHMACSHA256(const std::string &hexkey, const std::string &hexin, const std::string &hexout) {
std::vector<unsigned char> key = ParseHex(hexkey);
TestVector(CHMAC_SHA256(&key[0], key.size()), ParseHex(hexin), ParseHex(hexout));
}
