commit bc68c15d118c7b607c26a672a558b5e93e817ec3
Author: h <h>
Date:   Wed Nov 6 14:44:39 2024 -0500

    slows

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8a90096
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.o
+.ccls-cache/
+slows
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..578d85e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,17 @@
+CC=gcc
+CFLAGS=-Wall -Wextra -ggdb -std=gnu99
+SRC=arith.c circ.c client.c hosts.c parse.c pre.c online.c msg.c com.c
+OBJ=$(SRC:.c=.o)
+LIBS=-lcrypto
+
+all:		client
+
+.SUFFIXES: 	.c .o
+.c.o:
+		$(CC) -c $(CFLAGS) $*.c
+
+client: $(OBJ)
+		$(CC) $(LIBS) -o slows $(OBJ)
+
+clean:
+		rm -f *.o slows
diff --git a/arith.c b/arith.c
new file mode 100644
index 0000000..1b72f1e
--- /dev/null
+++ b/arith.c
@@ -0,0 +1,68 @@
+#include "arith.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+// Field: 18446744073709551557
+
+const uint64_t MOD = 18446744073709551557ULL;
+
+fp *rand_fp() {
+  uint64_t v = ((uint64_t)rand() << 32) | ((uint64_t)rand());
+  v = v % MOD;
+  fp *x = malloc(sizeof(fp));
+  x->val = v;
+  return x;
+}
+
+fp *from(uint64_t v) {
+  fp *x = malloc(sizeof(fp));
+  x->val = v % MOD;
+  return x;
+}
+
+fp *add(fp *a, fp *b) {
+  fp *x = malloc(sizeof(fp));
+  x->val = (a->val + b->val);
+  if (x->val > MOD || (x->val < a->val && x->val < b->val)) {
+    x->val -= MOD;
+  }
+  x->val %= MOD;
+  return x;
+}
+
+fp *mul(fp *a, fp *b) {
+  uint64_t v = b->val;
+  uint64_t r = a->val;
+  uint64_t o = 0;
+  while (v > 0) {
+    if (v % 2 == 1) {
+      uint64_t tmp = o + r;
+      if (tmp > MOD || (tmp < o && tmp < r)) {
+        tmp -= MOD;
+      }
+      o = tmp % MOD;
+    }
+    // r + r
+    uint64_t tmp = r + r;
+    if (tmp > MOD || (tmp < r)) {
+      tmp -= MOD;
+    }
+    r = tmp % MOD;
+
+    v >>= 1;
+  }
+  o = o % MOD;
+  fp *x = malloc(sizeof(fp));
+  x->val = o;
+  return x;
+}
+
+fp *neg(fp *a) {
+  fp *x = malloc(sizeof(fp));
+  x->val = MOD - a->val;
+  return x;
+}
+
+int is_zero(fp *x) { return (x->val == 0); }
+
+uint64_t get_output(fp *x) { return x->val; }
diff --git a/arith.h b/arith.h
new file mode 100644
index 0000000..63b0de5
--- /dev/null
+++ b/arith.h
@@ -0,0 +1,38 @@
+#ifndef H_ARITH
+#define H_ARITH
+
+#include <stdint.h>
+
+// Field element (invariant: val <= MOD)
+typedef struct {
+  uint64_t val;
+} fp;
+
+// An authenticated share: consists of linear shares of (x, Delta * x)
+struct share {
+  fp *s;
+  fp *s_mac;
+};
+
+// Generate a fully random field element
+fp *rand_fp();
+
+// Convert a uint to a Fp
+fp *from(uint64_t v);
+
+// Add two field elements together
+fp *add(fp *a, fp *b);
+
+// Multiply two field elements together
+fp *mul(fp *a, fp *b);
+
+// Negate a field element (-x)
+fp *neg(fp *a);
+
+// Check if a field element is zero.
+int is_zero(fp *x);
+
+// Produce a printable uint64 from the field element.
+uint64_t get_output(fp *o);
+
+#endif
diff --git a/circ.c b/circ.c
new file mode 100644
index 0000000..e2f5ba9
--- /dev/null
+++ b/circ.c
@@ -0,0 +1,155 @@
+#include "circ.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+
+struct wires *g_wires;
+
+void init_circuit(char *file) {
+
+  char *line = NULL;
+  size_t len = 0;
+  ssize_t read;
+
+  g_wires = NULL;
+
+  FILE *fp = fopen(file, "r");
+  if (fp == NULL) {
+    printf("Circuit file not found.\n");
+    exit(1);
+  }
+
+  while ((read = getline(&line, &len, fp)) != -1) {
+    char *wname = malloc(200 * sizeof(char));
+    char op[4];
+    char *in1 = malloc(200 * sizeof(char));
+    char *in2 = malloc(200 * sizeof(char));
+    int ret = sscanf(line, "%200s = %3s %200s %200s", wname, op, in1, in2);
+    if (ret == 4) {
+      if (strcmp(op, "inp") == 0) {
+        struct wire *w = malloc(sizeof(struct wire));
+        w->wname = wname;
+        w->operation = 2;
+        w->val = from(atoi(in2));
+        w->depth = 0;
+        w->in1 = NULL;
+        w->in2 = NULL;
+        w->is_output = 0;
+        w->input_name = in1;
+        struct wires *cur = malloc(sizeof(struct wires));
+        cur->w = w;
+        cur->next = g_wires;
+        g_wires = cur;
+      } else if (strcmp(op, "add") == 0) {
+        struct wire *inw1;
+        struct wire *inw2;
+        struct wires *a;
+        for (a = g_wires; a != NULL; a = a->next) {
+          if (strcmp(a->w->wname, in1) == 0) {
+            inw1 = a->w;
+          }
+          if (strcmp(a->w->wname, in2) == 0) {
+            inw2 = a->w;
+          }
+        }
+
+        struct wire *w = malloc(sizeof(struct wire));
+        w->wname = wname;
+        w->operation = 0;
+        w->val = 0;
+        w->depth = MAX(inw1->depth, inw2->depth) + 1;
+        w->in1 = inw1;
+        w->in2 = inw2;
+        w->is_output = 0;
+        struct wires *cur = malloc(sizeof(struct wires));
+        cur->w = w;
+        cur->next = g_wires;
+        g_wires = cur;
+
+      } else if (strcmp(op, "mul") == 0) {
+        struct wire *inw1;
+        struct wire *inw2;
+        struct wires *a;
+        for (a = g_wires; a != NULL; a = a->next) {
+          if (strcmp(a->w->wname, in1) == 0) {
+            inw1 = a->w;
+          }
+          if (strcmp(a->w->wname, in2) == 0) {
+            inw2 = a->w;
+          }
+        }
+        struct wire *w = malloc(sizeof(struct wire));
+        w->wname = wname;
+        w->operation = 1;
+        w->val = 0;
+        w->depth = MAX(inw1->depth, inw2->depth) + 1;
+        w->in1 = inw1;
+        w->in2 = inw2;
+        w->is_output = 0;
+        struct wires *cur = malloc(sizeof(struct wires));
+        cur->w = w;
+        cur->next = g_wires;
+        g_wires = cur;
+      }
+    } else if (ret == 3) {
+      if (strcmp(op, "inp") == 0) {
+
+        struct wire *w = malloc(sizeof(struct wire));
+        w->wname = wname;
+        w->operation = 2;
+        w->val = 0;
+        w->depth = 0;
+        w->in1 = NULL;
+        w->in2 = NULL;
+        w->is_output = 0;
+        w->input_name = in1;
+        struct wires *cur = malloc(sizeof(struct wires));
+        cur->w = w;
+        cur->next = g_wires;
+        g_wires = cur;
+      } else if (strcmp(op, "con") == 0) {
+        struct wire *w = malloc(sizeof(struct wire));
+        w->wname = wname;
+        w->operation = 3;
+        w->val = from(atoi(in1));
+        w->depth = 0;
+        w->in1 = NULL;
+        w->in2 = NULL;
+        w->is_output = 0;
+        struct wires *cur = malloc(sizeof(struct wires));
+        cur->w = w;
+        cur->next = g_wires;
+        g_wires = cur;
+      }
+    } else {
+      char *wwname = malloc(200 * sizeof(char));
+      int nret = sscanf(line, "out %200s", wwname);
+      if (nret == 1) {
+        struct wire *inw1;
+        struct wires *a;
+        for (a = g_wires; a != NULL; a = a->next) {
+          if (strcmp(a->w->wname, wwname) == 0) {
+            inw1 = a->w;
+          }
+        }
+        inw1->is_output = 1;
+      }
+      // otherwise ignore the command
+    }
+  }
+
+  struct wires *cur = g_wires;
+  struct wires *prev = NULL;
+  struct wires *next;
+
+  while (cur != NULL) {
+    next = cur->next;
+    cur->next = prev;
+    prev = cur;
+    cur = next;
+  }
+
+  g_wires = prev;
+}
diff --git a/circ.h b/circ.h
new file mode 100644
index 0000000..4df216c
--- /dev/null
+++ b/circ.h
@@ -0,0 +1,33 @@
+#ifndef H_CIRC
+#define H_CIRC
+
+#include "arith.h"
+
+// A wire value.
+struct wire {
+  char *wname;      // wire name
+  struct wire *in1; // input value 1 into gate
+  struct wire *in2; // input value 2 into gate
+  int depth; // the circuit forms a DAG -> this is the DAG depth. It is *not
+             // necessary* to use this.
+  fp *val;   // IF constant, this is the constant value on the wire
+             // IF input (for this party), this is the value for that input
+  int operation;
+  // 0 for addition, 1 for multiplication, 2 for input, 3 for constant
+  // if its an input wire or constant wire, in1 and in2 are null.
+
+  int is_output;    // If the wire is an output wire.
+  char *input_name; // name of user who provides input if wire is input wire
+
+  struct share *share; // TODO: fill this in when evaluating the circuit
+};
+
+// A linked list of wires; this holds the wires ready in evaluation order.
+struct wires {
+  struct wires *next;
+  struct wire *w;
+};
+
+void init_circuit(char *file);
+
+#endif
diff --git a/client.c b/client.c
new file mode 100644
index 0000000..ec6f5ea
--- /dev/null
+++ b/client.c
@@ -0,0 +1,179 @@
+#include "circ.h"
+#include "hosts.h"
+#include "online.h"
+#include "parse.h"
+#include "pre.h"
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+extern char *f_host; // host filename (ignore)
+extern char *f_circ; // circuit filename (ignore)
+extern char *f_pre;  // preprocess filename (ignore)
+
+extern struct host *conns[1024]; // external connections to other parties
+extern int num_conns;            // number of total connections
+extern char *glob_name;          // global ident for this party
+
+extern fp *delta;
+
+extern struct wires *g_wires; // circuit wires stored linearly (order matters!)
+
+extern struct randv *auth_rand;     // authenticated randomness (ie; malicious
+                                    // secret shares of random values)
+extern struct triple *auth_triples; // authenticated triples (ie; malicious
+                                    // secret shares of a, b, ab)
+
+void initialize() {
+  init_hosts(f_host);
+  init_circuit(f_circ);
+  init_preprocess(f_pre);
+
+  printf("\n\n\n --- CONNECTIONS --- \n\n");
+  for (int i = 0; i < num_conns; i++) {
+    printf("Connected with %s:%d at %d\n", conns[i]->name, conns[i]->c_port,
+           conns[i]->h_port);
+  }
+
+  printf("\n --- PREPROCESSING --- \n\n");
+
+  printf("GLOBAL MAC SHARE: [%lu]\n", delta->val);
+
+  struct triple *t;
+  for (t = auth_triples; t != NULL; t = t->next) {
+    printf("TRIPLE [a] = (%lu %lu) [b] = (%lu %lu) [c] = (%lu %lu)\n",
+           t->a->s->val, t->a->s_mac->val, t->b->s->val, t->b->s_mac->val,
+           t->ab->s->val, t->ab->s_mac->val);
+  }
+
+  struct randv *r;
+
+  for (r = auth_rand; r != NULL; r = r->next) {
+    printf("RAND [r] = (%lu %lu)", r->s->s->val, r->s->s_mac->val);
+    if (r->value != NULL) {
+      printf(" (r = %lu)\n", r->value->val);
+    } else {
+      printf("\n");
+    }
+  }
+
+  printf("\n --- WIRES --- \n\n");
+
+  struct wires *a;
+
+  for (a = g_wires; a != NULL; a = a->next) {
+    if (a->w->operation == 2) {
+      printf("INPUT WIRE BY [%s] ", a->w->input_name);
+      if (strcmp(a->w->input_name, glob_name) == 0) {
+        printf("(i = %lu)\n", a->w->val->val);
+      } else {
+        printf("\n");
+      }
+    }
+  }
+}
+
+uint8_t check_arr(uint8_t *ready, int len) {
+  for (int i = 0; i < len; i++) {
+    if (((ready[i] & 1) == 0) || ((ready[i] & 2) == 0)) {
+      return 0;
+    }
+  }
+  return 1;
+}
+
+void wait_for_connections() {
+
+  printf("\n\n\n --- PHASE 1 --- \n\n\n");
+
+  printf("Waiting for connections...\n");
+
+  struct pollfd *fds = malloc(sizeof(struct pollfd) * num_conns);
+
+  uint8_t *is_ready = malloc(sizeof(uint8_t) * num_conns);
+  for (int i = 0; i < num_conns; i++) {
+    is_ready[i] = 0;
+  }
+
+  while (check_arr(is_ready, num_conns) == 0) {
+    int numfds = 0;
+    // send out a ping to all hosts, and wait 10 seconds for an ack
+    char pepega[4] = {'p', 'i', 'n', 'g'};
+    for (int i = 0; i < num_conns; i++) {
+      if ((is_ready[i] & 1) == 0) {
+        printf("Pinging %s\n", conns[i]->name);
+        sendto(conns[i]->sockfd, pepega, 4, 0,
+               (const struct sockaddr *)&conns[i]->conn,
+               sizeof(conns[i]->conn));
+        fds[numfds].fd = conns[i]->sockfd;
+        fds[numfds].events = POLLIN;
+        fds[numfds].revents = 0;
+        numfds += 1;
+      } else if ((is_ready[i] & 2) == 0) {
+        fds[numfds].fd = conns[i]->sockfd;
+        fds[numfds].events = POLLIN;
+        fds[numfds].revents = 0;
+        numfds += 1;
+      }
+    }
+
+    int out = poll(fds, numfds, 10000);
+
+    if (out > 0) {
+      for (int i = 0; i < numfds; i++) {
+        if (fds[i].revents > 0) {
+          int connid = 0;
+          for (int j = 0; j < num_conns; j++) {
+            if (conns[j]->sockfd == fds[i].fd) {
+              connid = j;
+            }
+          }
+
+          unsigned char buf[4] = {0};
+          socklen_t len = sizeof(conns[connid]->conn);
+          recvfrom(fds[i].fd, buf, 4, 0,
+                   (struct sockaddr *)&(conns[connid]->conn), &len);
+
+          if (buf[0] == 'p' && buf[1] == 'i' && buf[2] == 'n' &&
+              buf[3] == 'g') {
+            printf("Received ping from %s, acking\n", conns[connid]->name);
+            char omega[4] = {'a', 'c', 'k', 'n'};
+            sendto(fds[i].fd, omega, 4, 0,
+                   (const struct sockaddr *)&conns[connid]->conn,
+                   sizeof(conns[connid]->conn));
+            is_ready[connid] |= 2;
+          } else if (buf[0] == 'a' && buf[1] == 'c' && buf[2] == 'k' &&
+                     buf[3] == 'n') {
+            printf("Received ack from %s\n", conns[connid]->name);
+            is_ready[connid] |= 1;
+          }
+        }
+      }
+    }
+  }
+
+  free(is_ready);
+
+  sleep(5);
+}
+
+int main(int argc, char **argv) {
+  srand(time(NULL));
+  parse(argc, argv);
+
+  printf("Got host file: %s\n", f_host);
+  printf("Got circuit file: %s\n", f_circ);
+  printf("Got preprocessing file: %s\n\n\n", f_pre);
+
+  initialize();
+
+  wait_for_connections();
+
+  printf("\n\n\n --- PHASE 2 ---\n\n\n");
+
+  spdz_online(conns, num_conns, glob_name, delta, g_wires, auth_rand,
+              auth_triples);
+}
diff --git a/com.c b/com.c
new file mode 100644
index 0000000..f664fbf
--- /dev/null
+++ b/com.c
@@ -0,0 +1,31 @@
+
+#include "arith.h"
+#include <assert.h>
+#include <openssl/sha.h>
+#include <stdlib.h>
+
+char *commit(fp *data, fp *random) {
+  char inp_data[16];
+  char *outbuf = malloc(32 * sizeof(char));
+  for (int i = 0; i < 32; i++) {
+    outbuf[i] = 0;
+  }
+  ((uint64_t *)inp_data)[0] = data->val;
+  ((uint64_t *)inp_data)[1] = random->val;
+  SHA256((unsigned char *)inp_data, 8, (unsigned char *)outbuf);
+  return outbuf;
+};
+
+void check_open(fp *data, fp *random, char *commitment) {
+  char inp_data[16];
+  char *outbuf = malloc(32 * sizeof(char));
+  for (int i = 0; i < 32; i++) {
+    outbuf[i] = 0;
+  }
+  ((uint64_t *)inp_data)[0] = data->val;
+  ((uint64_t *)inp_data)[1] = random->val;
+  SHA256((unsigned char *)inp_data, 8, (unsigned char *)outbuf);
+  for (int i = 0; i < 32; i++) {
+    assert(outbuf[i] == commitment[i]);
+  }
+};
diff --git a/com.h b/com.h
new file mode 100644
index 0000000..48bb06b
--- /dev/null
+++ b/com.h
@@ -0,0 +1,16 @@
+
+#ifndef H_COM
+#define H_COM
+
+#include "arith.h"
+#include <openssl/sha.h>
+
+// Produces a char[32] 32 byte array with the commitment contained within.
+// NOTE: IT IS 32 BYTES EXACTLY.
+char *commit(fp *data, fp *random);
+
+// Checks the opening of a 32 byte commitment (makes commitment correctly bound
+// data).
+char *check_open(fp *data, fp *random, char *commitment);
+
+#endif
diff --git a/hosts.c b/hosts.c
new file mode 100644
index 0000000..a02d89c
--- /dev/null
+++ b/hosts.c
@@ -0,0 +1,88 @@
+#include "hosts.h"
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+
+struct host *conns[1024];
+int num_conns = 0;
+char *glob_name;
+
+int init_conn(int h_port) {
+
+  int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+  if (sock_fd < 0) {
+    printf("Socket initialization failed.");
+    exit(1);
+  }
+
+  struct sockaddr_in serv_addr;
+
+  memset(&serv_addr, 0, sizeof(serv_addr));
+
+  serv_addr.sin_family = AF_INET;
+  serv_addr.sin_port = htons(h_port);
+  serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+  if (bind(sock_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
+    printf("Failed to bind socket.\n");
+    exit(1);
+  }
+
+  return sock_fd;
+}
+
+void init_hosts(char *file) {
+
+  char *line = NULL;
+  size_t len = 0;
+  ssize_t read;
+
+  FILE *fp = fopen(file, "r");
+  if (fp == NULL) {
+    printf("Host file not found.\n");
+    exit(1);
+  }
+
+  int name = 1;
+
+  while ((read = getline(&line, &len, fp)) != -1) {
+    if (name == 1) {
+      glob_name = malloc(sizeof(char) * (strlen(line) + 1));
+      strcpy(glob_name, line);
+      glob_name[strcspn(glob_name, "\n")] = 0;
+      printf("Name: %s", glob_name);
+      name = 0;
+    } else {
+      char *cname = malloc(200 * sizeof(char));
+      char *addr = malloc(32 * sizeof(char));
+      int c_port;
+      int h_port;
+      int ret = sscanf(line, "%200s %d %32s %d", cname, &h_port, addr, &c_port);
+      if (ret != 4) {
+        printf("Could not parse host file.\n");
+        exit(1);
+      }
+      struct host *h = malloc(sizeof(struct host));
+      h->name = cname;
+      h->h_port = h_port;
+      h->c_port = c_port;
+      h->sockfd = init_conn(h_port);
+
+      struct sockaddr_in conn_addr;
+
+      memset(&conn_addr, 0, sizeof(conn_addr));
+
+      conn_addr.sin_family = AF_INET;
+      conn_addr.sin_port = htons(c_port);
+      conn_addr.sin_addr.s_addr = inet_addr(addr);
+      free(addr);
+      h->conn = conn_addr;
+      conns[num_conns] = h;
+      num_conns += 1;
+    }
+  }
+}
diff --git a/hosts.h b/hosts.h
new file mode 100644
index 0000000..3b0e644
--- /dev/null
+++ b/hosts.h
@@ -0,0 +1,17 @@
+#ifndef H_HOST
+#define H_HOST
+
+#include <netinet/in.h>
+
+// A connection.
+struct host {
+  char *name;
+  int sockfd;
+  struct sockaddr_in conn;
+  int h_port;
+  int c_port;
+};
+
+void init_hosts(char *file);
+
+#endif
diff --git a/msg.c b/msg.c
new file mode 100644
index 0000000..069f22f
--- /dev/null
+++ b/msg.c
@@ -0,0 +1,77 @@
+#include "msg.h"
+#include "hosts.h"
+#include <poll.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+fp *packet_to_fp(packet *p) {
+  fp *f = malloc(sizeof(fp));
+  f->val = be64toh(((uint64_t *)p->data)[0]);
+  return f;
+}
+
+packet *fp_to_packet(fp *elem) {
+  uint64_t *buf = malloc(sizeof(char) * 8);
+  buf[0] = htobe64(elem->val);
+  packet *p = malloc(sizeof(packet));
+  p->data = (uint8_t *)buf;
+  p->len = 8;
+  return p;
+}
+
+packet *to_packet(uint8_t *data, uint8_t len) {
+  packet *p = malloc(sizeof(packet));
+  p->data = data;
+  p->len = len;
+  return p;
+}
+
+void broadcast(struct host **conns, int num_conns, packet *data) {
+
+  char *transmit = malloc(sizeof(char) * data->len + 1);
+  transmit[0] = (char)data->len;
+  memcpy((transmit + 1), data->data, data->len);
+  for (int i = 0; i < num_conns; i++) {
+    sendto(conns[i]->sockfd, transmit, data->len + 1, 0,
+           (const struct sockaddr *)&conns[i]->conn, sizeof(conns[i]->conn));
+  }
+  free(transmit);
+}
+
+packet *recv_broadcasts(struct host **conns, int num_conns) {
+
+  packet *packets = malloc(sizeof(packet) * num_conns);
+
+  for (int i = 0; i < num_conns; i++) {
+    packets[i].data = NULL;
+    packets[i].len = 0;
+  }
+
+  for (int i = 0; i < num_conns; i++) {
+    uint8_t *buf = malloc(sizeof(uint8_t) * 64);
+    socklen_t len = sizeof(conns[i]->conn);
+    recvfrom(conns[i]->sockfd, buf, 64, 0, (struct sockaddr *)&(conns[i]->conn),
+             &len);
+    uint8_t size = buf[0];
+    packets[i].data = (buf + 1);
+    packets[i].len = size;
+  }
+
+  return packets;
+}
+
+packet *recv_single_broadcast(struct host *con) {
+  packet *p = malloc(sizeof(packet));
+  p->data = NULL;
+  p->len = 0;
+  uint8_t *buf = malloc(sizeof(uint8_t) * 64);
+  socklen_t len = sizeof(con->conn);
+  recvfrom(con->sockfd, buf, 64, 0, (struct sockaddr *)&(con->conn), &len);
+  uint8_t size = buf[0];
+  p->data = (buf + 1);
+  p->len = size;
+
+  return p;
+}
diff --git a/msg.h b/msg.h
new file mode 100644
index 0000000..4288df1
--- /dev/null
+++ b/msg.h
@@ -0,0 +1,33 @@
+#ifndef H_MSG
+#define H_MSG
+
+#include "arith.h"
+#include "hosts.h"
+#include <stdint.h>
+
+typedef struct {
+  uint8_t *data;
+  uint8_t len;
+} packet;
+
+// Convert a packet (recieved on the network) into a field element.
+fp *packet_to_fp(packet *p);
+
+// Convert a field element to a packet.
+packet *fp_to_packet(fp *elem);
+
+// Convert a char [len] array into a packet.
+// Note: this is necessary for the commitments sent.
+packet *to_packet(uint8_t *data, uint8_t len);
+
+// Broadcast to all connections a packet.
+void broadcast(struct host **conns, int num_conns, packet *data);
+
+// Recieve from all connections a packet.
+packet *recv_broadcasts(struct host **conns, int num_conns);
+
+// Recieve from a single connection a packet. (Can use it for recieving the
+// initial input opening for wires).
+packet *recv_single_broadcast(struct host *con);
+
+#endif
diff --git a/online.c b/online.c
new file mode 100644
index 0000000..7e35cfc
--- /dev/null
+++ b/online.c
@@ -0,0 +1,85 @@
+#include "online.h"
+#include "arith.h"
+#include "circ.h"
+#include "com.h"
+#include "hosts.h"
+#include "msg.h"
+#include "pre.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// here we want to open a share:
+// to do this, players
+//  1. broadcast openings to plain shares
+//  2. commit to mac candidate differences
+//  3. open commitments
+//  4. check the commitments; if they don't verify abort
+//  5. if the sum is not 0, abort
+fp *secure_open(struct host **conns, int num_conns, fp *delta,
+                struct share *s) {
+
+  // TODO: implement this
+};
+
+// Add a constant to a shared value [x] -> [x + c]
+// a single arbitrary party should do the s -> s + c update: you may assume this
+// party is named "p0" everyone updates macs!
+struct share *const_add(struct share *s, fp *constant, fp *delta,
+                        char *glob_name) {
+  // TODO: implement this
+
+};
+
+// Multiply a constant to a shared value [x] -> [cx]
+struct share *const_mul(struct share *s, fp *constant) {
+  // TODO: implement this
+};
+
+// Do a local share add ([x], [y]) -> [x + y]
+struct share *local_add(struct share *s1, struct share *s2) {
+  // TODO: implement this
+};
+
+// Do a local share sub ([x], [y]) -> [x - y]
+struct share *local_sub(struct share *s1, struct share *s2) {
+  // TODO: implement this
+  // (not strictly necessary, but useful for mult)
+};
+
+// Use the opening and a triple to do a multiplication
+// Do a multiplication ([x], [y]) -> [xy]
+struct share *multiply(struct host **conns, int num_conns, fp *delta,
+                       char *glob_name, struct share *s1, struct share *s2,
+                       struct triple *t) {
+  // TODO: implement this
+};
+
+// Arguments:
+//      1. conns is the list of connections.  [ This is for broadcasting ].
+//      2. num_conns is the number of connections.  [ For broadcasting ]
+//      3. glob_name is the global name of you (the party).  [ For const add ]..
+//      4. delta is the SPDZ global mac share.
+//      5. g_wires is the global linked list of wires in eval order.
+//      6. auth_rand is a list of random shares [r] (along with input vals)
+//      7. auth_triples is a list of beaver triples [a], [b], [ab].
+// Proceed through g_wires and evaluate each wire until you hit the end.
+void spdz_online(struct host **conns, int num_conns, char *glob_name, fp *delta,
+                 struct wires *g_wires, struct randv *auth_rand,
+                 struct triple *auth_triples) {
+
+  // 1. loop through all the wires in the g_wires linked list
+  //
+  // 2. Check what operation is the wire from: do the operation (multiply, add)
+  //          dont forget the edge case when one of the input wires is a
+  //          constant!
+  //
+  // 3. (within the previous check): if the wire is input, use up an auth_rand
+  // random share and produce shares of the input
+  // 4. (within the previous check): if the wire is output, calculate it and
+  // then at the end do a secure opening to find the output value.
+
+  // NOTE: don't worry about freeing or managing stuff, we don't care about
+  // memory leaks or anything lol this aint a C class
+}
diff --git a/online.h b/online.h
new file mode 100644
index 0000000..107a2c7
--- /dev/null
+++ b/online.h
@@ -0,0 +1,14 @@
+
+#ifndef H_ONL
+#define H_ONL
+
+#include "arith.h"
+#include "circ.h"
+#include "hosts.h"
+#include "pre.h"
+
+void spdz_online(struct host **conns, int num_conns, char *glob_name,
+                 fp *mac_share, struct wires *g_wires, struct randv *auth_rand,
+                 struct triple *auth_triples);
+
+#endif
diff --git a/parse.c b/parse.c
new file mode 100644
index 0000000..0e9f77c
--- /dev/null
+++ b/parse.c
@@ -0,0 +1,50 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+extern char *optarg;
+char *f_pre;
+char *f_host;
+char *f_circ;
+
+int parse(int argc, char **argv) {
+  char opt;
+  bool h;
+  bool c;
+  bool p;
+
+  while ((opt = getopt(argc, argv, "h:c:p:")) != EOF) {
+    switch (opt) {
+    case 'h':
+      f_host = optarg;
+      h = true;
+      break;
+    case 'c':
+      f_circ = optarg;
+      c = true;
+      break;
+    case 'p':
+      f_pre = optarg;
+      p = true;
+      break;
+    }
+  }
+
+  if (!h) {
+    printf("Please provide all arguments.\n");
+    exit(1);
+  }
+
+  if (!c) {
+    printf("Please provide all arguments.\n");
+    exit(1);
+  }
+
+  if (!p) {
+    printf("Please provide all arguments.\n");
+    exit(1);
+  }
+
+  return optind;
+}
diff --git a/parse.h b/parse.h
new file mode 100644
index 0000000..b1c757d
--- /dev/null
+++ b/parse.h
@@ -0,0 +1,6 @@
+#ifndef H_PARSE
+#define H_PARSE
+
+int parse(int argc, char **argv);
+
+#endif
diff --git a/pre.c b/pre.c
new file mode 100644
index 0000000..580b976
--- /dev/null
+++ b/pre.c
@@ -0,0 +1,85 @@
+#include "pre.h"
+#include "circ.h"
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct randv *auth_rand;
+struct triple *auth_triples;
+
+fp *delta;
+
+void init_preprocess(char *file) {
+  char *line = NULL;
+  size_t len = 0;
+  ssize_t read;
+
+  auth_rand = NULL;
+  auth_triples = NULL;
+
+  FILE *fp = fopen(file, "r");
+  if (fp == NULL) {
+    printf("Preprocessing file not found.\n");
+    exit(1);
+  }
+
+  while ((read = getline(&line, &len, fp)) != -1) {
+    char *wname = malloc(200 * sizeof(char));
+    uint64_t share;
+    uint64_t share_mac;
+    uint64_t val;
+    int ret = sscanf(line, "rand %200s (%lu, %lu) %lu", wname, &share,
+                     &share_mac, &val);
+    if (ret == 4) {
+      struct randv *rand_value = malloc(sizeof(struct randv));
+      rand_value->wname = wname;
+      rand_value->next = auth_rand;
+      rand_value->s = malloc(sizeof(struct share));
+      rand_value->s->s = from(share);
+      rand_value->s->s_mac = from(share_mac);
+      rand_value->value = from(val);
+      auth_rand = rand_value;
+    } else if (ret == 3) {
+      struct randv *rand_value = malloc(sizeof(struct randv));
+      rand_value->wname = wname;
+      rand_value->next = auth_rand;
+      rand_value->s = malloc(sizeof(struct share));
+      rand_value->s->s = from(share);
+      rand_value->s->s_mac = from(share_mac);
+      rand_value->value = NULL;
+      auth_rand = rand_value;
+    } else {
+      uint64_t share_a;
+      uint64_t share_mac_a;
+      uint64_t share_b;
+      uint64_t share_mac_b;
+      uint64_t share_ab;
+      uint64_t share_mac_ab;
+      int ret = sscanf(line, "triple (%lu, %lu) (%lu, %lu) (%lu, %lu)",
+                       &share_a, &share_mac_a, &share_b, &share_mac_b,
+                       &share_ab, &share_mac_ab);
+      if (ret == 6) {
+        struct triple *tp = malloc(sizeof(struct triple));
+        tp->next = auth_triples;
+        tp->a = malloc(sizeof(struct share));
+        tp->a->s = from(share_a);
+        tp->a->s_mac = from(share_mac_a);
+        tp->b = malloc(sizeof(struct share));
+        tp->b->s = from(share_b);
+        tp->b->s_mac = from(share_mac_b);
+        tp->ab = malloc(sizeof(struct share));
+        tp->ab->s = from(share_ab);
+        tp->ab->s_mac = from(share_mac_ab);
+        auth_triples = tp;
+      } else {
+        uint64_t macv;
+        int mac = sscanf(line, "mac %lu", &macv);
+        if (mac == 1) {
+          delta = from(macv);
+        }
+      }
+    }
+  }
+}
diff --git a/pre.h b/pre.h
new file mode 100644
index 0000000..b1ef0a2
--- /dev/null
+++ b/pre.h
@@ -0,0 +1,25 @@
+#ifndef H_PRE
+#define H_PRE
+
+#include "arith.h"
+
+// A linked list of Beaver triples [a], [b], [ab]
+struct triple {
+  struct triple *next;
+  struct share *a;
+  struct share *b;
+  struct share *ab;
+};
+
+// A linked list of authenticated maliciously secure random shares [r], each
+// associated with a wire. This should be used for generating shares of input.
+struct randv {
+  struct randv *next;
+  char *wname;     // name of associated wire
+  struct share *s; // authenticated share
+  fp *value;       // r (if applicable; ie wire is the user's input)
+};
+
+void init_preprocess(char *file);
+
+#endif
diff --git a/test0/ccfg1 b/test0/ccfg1
new file mode 100644
index 0000000..c4ccdaa
--- /dev/null
+++ b/test0/ccfg1
@@ -0,0 +1,10 @@
+w1 = inp p0 34
+w2 = inp p1
+w3 = inp p1
+w4 = inp p0 22
+
+w5 = mul w1 w3
+w6 = add w4 w2
+w7 = add w5 w6
+
+out w7
diff --git a/test0/ccfg2 b/test0/ccfg2
new file mode 100644
index 0000000..81bb09e
--- /dev/null
+++ b/test0/ccfg2
@@ -0,0 +1,10 @@
+w1 = inp p0
+w2 = inp p1 38
+w3 = inp p1 11
+w4 = inp p0
+
+w5 = mul w1 w3
+w6 = add w4 w2
+w7 = add w5 w6
+
+out w7
diff --git a/test0/hcfg1 b/test0/hcfg1
new file mode 100644
index 0000000..fe18012
--- /dev/null
+++ b/test0/hcfg1
@@ -0,0 +1,2 @@
+p0
+p1 8001 127.0.0.1 8010
diff --git a/test0/hcfg2 b/test0/hcfg2
new file mode 100644
index 0000000..95e2b14
--- /dev/null
+++ b/test0/hcfg2
@@ -0,0 +1,2 @@
+p1
+p0 8010 127.0.0.1 8001
diff --git a/test0/pcfg1 b/test0/pcfg1
new file mode 100644
index 0000000..eb630f5
--- /dev/null
+++ b/test0/pcfg1
@@ -0,0 +1,8 @@
+mac 5
+
+rand w1 (30, 73) 33
+rand w2 (9, 109)
+rand w3 (11, 223)
+rand w4 (33, 50) 50
+
+triple (129, 4431) (33, 999) (26805, 475214)
diff --git a/test0/pcfg2 b/test0/pcfg2
new file mode 100644
index 0000000..27af214
--- /dev/null
+++ b/test0/pcfg2
@@ -0,0 +1,8 @@
+mac 8
+
+rand w1 (3, 356)
+rand w2 (10, 138) 19
+rand w3 (21, 193) 32
+rand w4 (17, 600)
+
+triple (328, 1510) (87, 561) (28035, 237706)
diff --git a/test1/ccfg1 b/test1/ccfg1
new file mode 100644
index 0000000..8236dfa
--- /dev/null
+++ b/test1/ccfg1
@@ -0,0 +1,10 @@
+w1 = inp p0 34
+w2 = inp p1
+w3 = inp p1
+w4 = inp p2
+
+w5 = mul w1 w2
+w6 = mul w3 w4
+w7 = add w5 w6
+
+out w7
diff --git a/test1/ccfg2 b/test1/ccfg2
new file mode 100644
index 0000000..e6ee67a
--- /dev/null
+++ b/test1/ccfg2
@@ -0,0 +1,10 @@
+w1 = inp p0
+w2 = inp p1 38
+w3 = inp p1 11
+w4 = inp p2
+
+w5 = mul w1 w2
+w6 = mul w3 w4
+w7 = add w5 w6
+
+out w7
diff --git a/test1/ccfg3 b/test1/ccfg3
new file mode 100644
index 0000000..cc308bf
--- /dev/null
+++ b/test1/ccfg3
@@ -0,0 +1,10 @@
+w1 = inp p0
+w2 = inp p1
+w3 = inp p1
+w4 = inp p2 18
+
+w5 = mul w1 w2
+w6 = mul w3 w4
+w7 = add w5 w6
+
+out w7
diff --git a/test1/hcfg1 b/test1/hcfg1
new file mode 100644
index 0000000..d721ce5
--- /dev/null
+++ b/test1/hcfg1
@@ -0,0 +1,3 @@
+p0
+p1 8000 127.0.0.1 8010
+p2 8001 127.0.0.1 8020
diff --git a/test1/hcfg2 b/test1/hcfg2
new file mode 100644
index 0000000..fa6e02f
--- /dev/null
+++ b/test1/hcfg2
@@ -0,0 +1,3 @@
+p1
+p0 8010 127.0.0.1 8000
+p2 8011 127.0.0.1 8021
diff --git a/test1/hcfg3 b/test1/hcfg3
new file mode 100644
index 0000000..952334e
--- /dev/null
+++ b/test1/hcfg3
@@ -0,0 +1,3 @@
+p2
+p0 8020 127.0.0.1 8001
+p1 8021 127.0.0.1 8011
diff --git a/test1/pcfg1 b/test1/pcfg1
new file mode 100644
index 0000000..38ecba8
--- /dev/null
+++ b/test1/pcfg1
@@ -0,0 +1,9 @@
+mac 8
+
+rand w1 (30, 1000) 115
+rand w2 (9, 231)
+rand w3 (11, 223)
+rand w4 (10, 400)
+
+triple (722, 187202) (363, 6006) (667401, 6189301)
+triple (218331, 183634) (4398, 4313) (300405, 2821)
diff --git a/test1/pcfg2 b/test1/pcfg2
new file mode 100644
index 0000000..4f3b77b
--- /dev/null
+++ b/test1/pcfg2
@@ -0,0 +1,9 @@
+mac 10
+
+rand w1 (3, 200)
+rand w2 (10, 458) 50
+rand w3 (21, 111) 40
+rand w4 (17, 600)
+
+triple (9469, 87813) (109, 5125) (9135512, 37765626)
+triple (855730, 12895925) (7, 5387) (3245747137, 89995070763)
diff --git a/test1/pcfg3 b/test1/pcfg3
new file mode 100644
index 0000000..815e9ba
--- /dev/null
+++ b/test1/pcfg3
@@ -0,0 +1,9 @@
+mac 2
+
+rand w1 (82, 1100)
+rand w2 (31, 311)
+rand w3 (8, 466)
+rand w4 (33, 200) 60
+
+triple (5089, 30585) (170, 1709) (6847, 152240273)
+triple (353, 8408721) (42, 79240) (1531871516, 5563307576)