/**
* Writes the received payload into payload argument and returns the tag of the message
*/
unsigned char server(unsigned char * payload)
{
ulong msg_len = PAYLOAD_LEN + 1;
unsigned char* msg = malloc(msg_len);
// receive the message
BIO * b = socket_listen();
recv(b, msg, msg_len);
// wait for the client to close, to avoid "Address already in use" errors
wait_close(b);
unsigned char * pad = otp(msg_len); // apply the one-time pad
xor(msg, pad, msg_len);
// get the payload
memcpy(payload, msg + 1, PAYLOAD_LEN);
// return the tag
return *msg;
}
/**
* Given cipher text and a key, return the plain text
*/
int otp_decrypt(char * cipher, char * key, char * plain)
{
return otp(cipher, key, plain, &_otp_mns);
}
/**
* Given an input string and a key, return an encrypted
* string
*/
int otp_encrypt(char * plain, char * key, char * cipher)
{
return otp(plain, key, cipher, &_otp_pls);
}