int main () {
char *B64Text = "HUIfTQsPAh9PE048GmllH0kcDk4TAQsHThsBFkU2AB4BSWQgVB0dQzNTTmVSBgBHVBwNRU0HBAxTEjwMHghJGgkRTxRMIRpHKwAFHUdZEQQJAGQmB1MANxYGDBoXQR0BUlQwXwAgEwoFR0$";
char *buf = malloc(Base64decode_len(B64Text));
Base64decode(buf, B64Text);
RepeatedXorAnalysis(buf, Base64decode_len(B64Text) - 1);
}
int CACrypto::decodeBase64(const char* input,
char* output,
int outputBufferLength)
{
CCAssert(Base64decode_len(input) <= outputBufferLength, "CACrypto::decodeBase64() - outputBufferLength too small");
return Base64decode(output, input);
}
LUA_STRING Crypto::encodingBase64Lua(bool isDecoding,
const char* input,
int inputLength)
{
LuaStack* stack = LuaEngine::getInstance()->getLuaStack();
stack->clean();
int bufferSize = isDecoding ? Base64decode_len(input) : Base64encode_len(inputLength);
char *buffer = bufferSize ? (char*)malloc(bufferSize) : NULL;
int size = 0;
if (buffer)
{
size = isDecoding ? Base64decode(buffer, input) : Base64encode(buffer, input, inputLength);
}
if (size)
{
stack->pushString(buffer, size);
}
else
{
stack->pushNil();
}
if (buffer)
{
free(buffer);
}
return 1;
}
fzBuffer Data::B64Decode(const char *input, fzUInt inLength)
{
FZ_ASSERT(input, "Input pointer cannot be NULL");
FZ_ASSERT(inLength > 0, "Input data length cannot be 0.");
//should be enough to store 6-bit buffers in 8-bit buffers
fzUInt outputSize = Base64decode_len(input);
char *output = new(std::nothrow) char[outputSize];
if( output ) {
Base64decode(output, input);
return fzBuffer(output, outputSize);
}else{
FZLOGERROR("Base64: error allocating memory.");
return fzBuffer::empty();
}
}
extern "C" int Base64DecodedLength(const char* base64Src)
{
return Base64decode_len(base64Src);
}
int CACrypto::decodeBase64Len(const char* input)
{
return Base64decode_len(input);
}
void
nc_otoc_start(nc_opts *opts, int pair_raw_sock)
{
int shell_fd_sock;
int pair_fd_sock;
fd_set readfds;
int maxfds;
char time_str[NOW_STR_LEN];
enum {init, none,
text_sent, text_received,
pkey_sent, pkey_received} last_action = init;
shell_fd_sock = fileno(stdin);
pair_fd_sock = nc_utils_get_rec_sockfd(pair_raw_sock);
maxfds = pair_fd_sock + 1;
/* --- start of sending public key --- */
if(opts->secure) {
char *msg = NULL;
char *msg_type = OTOC_MTYPE_PKEY;
char *msg_body = NULL;
/* --- start of encoding public key --- */
const char *plain_pkey = (const char*) my_publickey;
int plain_pkey_len = crypto_box_PUBLICKEYBYTES;
char encoded_pkey[Base64encode_len(plain_pkey_len)];
Base64encode(encoded_pkey, plain_pkey, plain_pkey_len);
nc_log_writef("debug", "encode my public key: %s", encoded_pkey);
/* --- end of encoding public key --- */
msg_body = encoded_pkey;
nc_json_make_otoc_msg(&msg_type, &msg_body, plain_pkey_len, &msg);
nn_send(pair_raw_sock, msg, strlen(msg), 0);
nc_log_writef("debug", "one to one chat sent public key: %s", msg);
last_action = pkey_sent;
}
/* --- end of sending public key --- */
/* --- start of shel command registration --- */
nc_otoc_register_cmd("/help", func_cmd_help);
nc_otoc_register_cmd("/leave", func_cmd_leave);
/* --- end of shell commmand registration --- */
for(;;) {
switch(last_action) {
case init:
case pkey_sent:
fprintf(stdout,
">> Entering (room code %d) ...\n",
pair_raw_sock);
fprintf(stdout, ">>> ");
fflush(stdout);
break;
case text_received:
fprintf(stdout, ">>> ");
fflush(stdout);
break;
case text_sent:
fprintf(stdout, ">>> ");
fflush(stdout);
break;
case none:
fprintf(stdout, ">>> ");
fflush(stdout);
break;
case pkey_received:
break;
}
FD_ZERO(&readfds);
FD_SET(pair_fd_sock, &readfds);
FD_SET(shell_fd_sock, &readfds);
select(maxfds, &readfds, NULL, NULL, NULL);
if(FD_ISSET(shell_fd_sock, &readfds)) {
char *buf = NULL;
size_t buf_sz = 1024;
int i;
nc_utils_now_str(time_str);
getline(&buf, &buf_sz, stdin);
if(buf[0] == '\n') {
last_action = none;
} else if(buf[0] == '/') {
nc_utils_del_new_line(buf);
for(i = 0; i < cmd_current_code; i++) {
if(strstr(buf, cmds[i].name)) {
if(cmds[i].func(buf) < 0) {
return;
}
break;
}
}
last_action = none;
} else {
if(opts->secure) {
/* --- make ciphermsg with key pairs --- */
int ciphermsg_len = crypto_box_MACBYTES + strlen(buf);
unsigned char nonce[crypto_box_NONCEBYTES];
unsigned char ciphermsg[ciphermsg_len];
/* @TODO: use random nonce */
//randombytes_buf(nonce, sizeof nonce);
memset(nonce, '\0', sizeof nonce);
crypto_box_easy(ciphermsg, (const unsigned char*) buf,
strlen(buf), nonce,
peers_publickey[pair_raw_sock], my_secretkey);
/* --- make msg encoded with base64 --- */
const char *plain_ciphermsg = (const char*) ciphermsg;
int plain_ciphermsg_len = ciphermsg_len;
int encoded_ciphermsg_len = Base64encode_len(plain_ciphermsg_len);
char encoded_ciphermsg[encoded_ciphermsg_len];
Base64encode(encoded_ciphermsg, plain_ciphermsg, plain_ciphermsg_len);
nc_log_writef("debug", "encode ciphermsg: %s", encoded_ciphermsg);
/* --- serialize msg with json --- */
char *msg = NULL;
char *msg_type = OTOC_MTYPE_STXT;
char *msg_body = NULL;
msg_body = encoded_ciphermsg;
nc_json_make_otoc_msg(&msg_type, &msg_body, strlen(buf), &msg);
nc_log_writef("debug", "serialize encoded ciphermsg: %s", msg);
/* --- send msg --- */
nn_send(pair_raw_sock, msg, strlen(msg), 0);
} else {
char *msg = NULL;
char *msg_type = OTOC_MTYPE_RTXT;
nc_json_make_otoc_msg(&msg_type, &buf, strlen(buf), &msg);
nn_send(pair_raw_sock, msg, strlen(msg), 0);
fprintf(stdout, "[%s] >>> %s", time_str, buf);
fflush(stdout);
nc_utils_del_new_line(buf);
nc_log_writef("debug", "one to one chat sent: %s", buf);
nc_utils_empty_string(buf);
last_action = text_sent;
}
}
} else if(FD_ISSET(pair_fd_sock, &readfds)) {
char *buf = NULL;
char *msg_body = NULL;
char *msg_type = NULL;
int original_msg_body_len;
nn_recv(pair_raw_sock, &buf, NN_MSG, 0);
nc_json_extract_otoc_msg(&buf, &msg_type, &original_msg_body_len, &msg_body);
nc_utils_del_new_line(buf);
nc_log_writef("debug", "one to one chat received: %s", msg_type);
nn_freemsg(buf);
if(strncmp(msg_type, OTOC_MTYPE_PKEY, OTOC_MTYPE_LEN) == 0) {
/* public key message */
/* --- start of decoding public key --- */
int plain_pkey_len = Base64decode_len(msg_body);
char plain_pkey[plain_pkey_len];
Base64decode(plain_pkey, (const char*) msg_body);
strncpy(peers_publickey[pair_raw_sock], plain_pkey, crypto_box_PUBLICKEYBYTES);
nc_log_writef("debug", "decoded peer's public key was stored.");
/* --- end of decoding public key --- */
last_action = pkey_received;
} else if(strncmp(msg_type, OTOC_MTYPE_RTXT, OTOC_MTYPE_LEN) == 0) {
/* raw text message */
nc_utils_now_str(time_str);
fprintf(stdout, "\r[%s] <<< %s", time_str, msg_body);
fflush(stdout);
last_action = text_received;
} else if(strncmp(msg_type, OTOC_MTYPE_STXT, OTOC_MTYPE_LEN) == 0) {
/* secure text message */
if(!opts->secure) {
char *alert =
"\r[%s] <<< { ... encrypted message ... }\n"
"==========================================\n"
"Your peer uses NanoChat undre secure mode.\n"
"Use -s flag to see his encrypted messages.\n"
"==========================================\n";
nc_utils_now_str(time_str);
fprintf(stdout, alert, time_str);
fflush(stdout);
last_action = text_received;
} else {
/* --- decode secure msg body --- */
int plain_ciphermsg_len = Base64decode_len(msg_body);
char plain_ciphermsg[plain_ciphermsg_len];
Base64decode(plain_ciphermsg, (const char*) msg_body);
/* --- decrypt ciphermsg --- */
int decrypted_len = original_msg_body_len;
int ciphermsg_len = crypto_box_MACBYTES + decrypted_len;
unsigned char decrypted[decrypted_len];
unsigned char nonce[crypto_box_NONCEBYTES];
memset(nonce, '\0', sizeof nonce);
crypto_box_open_easy(decrypted, plain_ciphermsg, ciphermsg_len, nonce,
peers_publickey[pair_raw_sock], my_secretkey);
/* --- show decrypted msg body --- */
decrypted[original_msg_body_len] = '\0';
nc_utils_now_str(time_str);
fprintf(stdout, "\r[%s] <<< %s", time_str, decrypted);
fflush(stdout);
last_action = text_received;
}
}
}
}
}
static bool CreateDictionaryFromXMLRecursive(char *data, int size, CFMutableDictionaryRef *dict,
char *key)
{
if (size == 0) return true;
xml_token tok;
char *buf = data;
int bytesleft = size, closeindex;
bool bClosed, bAllocatedKey = false;
while (bytesleft) {
// skip whitespace
if (isspace(buf[0])) {
buf++;
bytesleft--;
continue;
}
bClosed = false;
closeindex = -1;
// get XML token
if (!GetNextToken(&buf, &bytesleft, &tok, &bClosed)) {
if (bAllocatedKey) free(key);
return false;
}
// closed XML token?
if (bClosed) {
if (key == NULL) continue;
if (*dict == NULL) {
if (bAllocatedKey) free(key);
return false;
}
CFBooleanRef value = NULL;
if (!strcasecmp(tok.id, "true")) {
value = kCFBooleanTrue;
}
else if (!strcasecmp(tok.id, "false")) {
value = kCFBooleanFalse;
}
if (value != NULL) {
CFStringRef cfkey = CFStringCreateWithCString(kCFAllocatorDefault,
key, kCFStringEncodingUTF8);
if (bAllocatedKey) {
free(key);
key = NULL;
bAllocatedKey = false;
}
if (cfkey == NULL) {
return false;
}
CFDictionaryAddValue(*dict, cfkey, value);
}
else if (bAllocatedKey) {
free(key);
key = NULL;
bAllocatedKey = false;
}
continue;
}
// check for token types we know about
if (!strcasecmp(tok.id, "key")) {
if (bAllocatedKey) free(key);
if (*dict == NULL) return false;
closeindex = PIGetIndexOfClosingTag(buf, bytesleft, "key");
if (closeindex == -1) return false;
key = (char*)malloc(closeindex+1);
strncpy(key, buf, closeindex);
key[closeindex] = 0;
StripWhitespace(&key);
#ifdef DEBUG
printf("key = %s\n", key);
#endif
// empty keys are not allowed
if (strlen(key) == 0) {
free(key);
return false;
}
bAllocatedKey = true;
buf += closeindex + 6;
bytesleft -= closeindex + 6;
}
else if (!strcasecmp(tok.id, "dict")) {
if (key == NULL) {
if (*dict != NULL) return false;
closeindex = PIGetIndexOfClosingTag(buf, bytesleft, "dict");
if (closeindex == -1) {
return false;
}
*dict = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (*dict == NULL) {
return false;
}
if (!CreateDictionaryFromXMLRecursive(buf, closeindex, dict, NULL)) {
CFRelease(*dict);
return false;
}
return true;
}
else if (*dict != NULL) {
closeindex = PIGetIndexOfClosingTag(buf, bytesleft, "dict");
if (closeindex == -1) {
if (bAllocatedKey) free(key);
return false;
}
CFMutableDictionaryRef dict2 = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (dict2 == NULL) {
if (bAllocatedKey) free(key);
return false;
}
if (!CreateDictionaryFromXMLRecursive(buf, closeindex, &dict2, NULL)) {
if (bAllocatedKey) free(key);
CFRelease(dict2);
return false;
}
CFStringRef cfkey = CFStringCreateWithCString(kCFAllocatorDefault,
key, kCFStringEncodingUTF8);
if (bAllocatedKey) {
free(key);
key = NULL;
bAllocatedKey = false;
}
if (cfkey == NULL) {
CFRelease(dict2);
return false;
}
CFDictionaryAddValue(*dict, cfkey, dict2);
buf += closeindex + 7;
bytesleft -= closeindex + 7;
}
else {
if (bAllocatedKey) free(key);
return false;
}
}
else if (!strcasecmp(tok.id, "data")) {
if ( (key == NULL) || (*dict == NULL) ) return false;
closeindex = PIGetIndexOfClosingTag(buf, bytesleft, "data");
if (closeindex == -1) {
if (bAllocatedKey) free(key);
return false;
}
CFStringRef cfkey = CFStringCreateWithCString(kCFAllocatorDefault,
key, kCFStringEncodingUTF8);
if (bAllocatedKey) {
free(key);
key = NULL;
bAllocatedKey = false;
}
if (cfkey == NULL) {
return false;
}
char *value = (char*)malloc(closeindex+1);
strncpy(value, buf, closeindex);
value[closeindex] = 0;
StripWhitespace(&value);
if (strlen(value) > 0) {
// Base64 decode the data
int decodelen = Base64decode_len(value);
if (decodelen > 0) {
char *decodedval = (char*)malloc(decodelen);
Base64decode(decodedval, value);
free(value);
value = decodedval;
}
}
CFDataRef cfvalue = CFDataCreate(kCFAllocatorDefault, (const UInt8*)value, strlen(value));
free(value);
if (cfvalue == NULL) {
return false;
}
CFDictionaryAddValue(*dict, cfkey, cfvalue);
buf += closeindex + 7;
bytesleft -= closeindex + 7;
}
else if (!strcasecmp(tok.id, "string")) {
if ( (key == NULL) || (*dict == NULL) ) return false;
closeindex = PIGetIndexOfClosingTag(buf, bytesleft, "string");
if (closeindex == -1) {
if (bAllocatedKey) free(key);
return false;
}
CFStringRef cfkey = CFStringCreateWithCString(kCFAllocatorDefault,
key, kCFStringEncodingUTF8);
if (bAllocatedKey) {
free(key);
key = NULL;
bAllocatedKey = false;
}
if (cfkey == NULL) {
return false;
}
char *value = (char*)malloc(closeindex+1);
strncpy(value, buf, closeindex);
value[closeindex] = 0;
StripWhitespace(&value);
#ifdef DEBUG
printf("string = %s\n", value);
#endif
CFStringRef cfvalue = CFStringCreateWithCString(kCFAllocatorDefault,
value, kCFStringEncodingUTF8);
free(value);
if (cfvalue == NULL) {
return false;
}
CFDictionaryAddValue(*dict, cfkey, cfvalue);
buf += closeindex + 9;
bytesleft -= closeindex + 9;
}
else if (!strcasecmp(tok.id, "?xml") || !strcasecmp(tok.id, "!DOCTYPE") ||
!strcasecmp(tok.id, "plist")) {
// Ignore
}
else {
// unknown token -- just skip it
if (bAllocatedKey) {
free(key);
key = NULL;
bAllocatedKey = false;
}
closeindex = PIGetIndexOfClosingTag(buf, bytesleft, tok.id);
if (closeindex == -1) {
return false;
}
buf += closeindex + strlen(tok.id) + 3;
bytesleft -= closeindex + strlen(tok.id) + 3;
}
}
if (bAllocatedKey) free(key);
return true;
}
