sovetin/UDPServer
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This commit is contained in:
Dmitry Sovetin
2019-10-24 13:53:28 +03:00
parent 289d0db7eb
commit bba8c620bd
1 changed files with 13 additions and 15 deletions
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28
udpserver.cpp
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@@ -162,7 +162,7 @@ void termHandler(int i) {
// XTea Encryption, use if necessary... // XTea Encryption, use if necessary...
void xteaEncipher(unsigned int num_rounds, uint32_t v[2], uint32_t const key[4]) { void xteaEncipher(unsigned int num_rounds, uint32_t v[2], uint32_t const key[4]) {
unsigned int i; unsigned int i;
uint32_t v0 = v[0], v1 = v[1], sum = 0, delta = 0x9E3779B9; uint32_t v0 = v[0], v1 = v[1], sum = 0, delta = 0x9E3779B9;
for (i = 0; i < num_rounds; i++) { for (i = 0; i < num_rounds; i++) {
v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]); v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
@@ -185,26 +185,24 @@ void xteaDecipher(unsigned int num_rounds, uint32_t v[2], uint32_t const key[4])
void stringCrypt(char *inout, int len, bool encrypt) // encrypt true - encrypt, false - decript void stringCrypt(char *inout, int len, bool encrypt) // encrypt true - encrypt, false - decript
{ {
for (int i = 0; i < len / BLOCK_SIZE; i++) { for (int i = 0; i < len / BLOCK_SIZE; i++) {
if (encrypt) { if (encrypt) {
xteaEncipher(32, (uint32_t*)(inout + (i * BLOCK_SIZE)), key); xteaEncipher(32, (uint32_t*)(inout + (i * BLOCK_SIZE)), key);
} else { } else {
xteaDecipher(32, (uint32_t*)(inout + (i * BLOCK_SIZE)), key); xteaDecipher(32, (uint32_t*)(inout + (i * BLOCK_SIZE)), key);
} }
} }
if (len % BLOCK_SIZE != 0) if (len % BLOCK_SIZE != 0) {
{ int mod = len % BLOCK_SIZE;
int mod = len % BLOCK_SIZE;
int offset = (len / BLOCK_SIZE) * BLOCK_SIZE; int offset = (len / BLOCK_SIZE) * BLOCK_SIZE;
char data[BLOCK_SIZE]; char data[BLOCK_SIZE];
memcpy(data, inout + offset, mod); memcpy(data, inout + offset, mod);
if (encrypt) { if (encrypt) {
xteaEncipher(32, (uint32_t*)data, key); xteaEncipher(32, (uint32_t*)data, key);
} else { } else {
xteaDecipher(32, (uint32_t*)data, key); xteaDecipher(32, (uint32_t*)data, key);
} }
memcpy(inout + offset, data, mod); memcpy(inout + offset, data, mod);
cout << mod << endl;
} }
} }