Hi Benny,
here is the code I used to encrypt the packets using RC4 algorithm:
typedef unsigned char UCHAR;
UCHAR S[256], i, j, t;
// i and j are counters
void init(const char *key, int keylen) {
int keypos = 0, x;
UCHAR K[256];
for( x=0; x<256; ++x ) {
S[x] = x;
K[x] = key[keypos++];
if( keypos >= keylen ) keypos=0;
}
for( j=x=0; x<256; ++x ) {
j += S[x] + K[x];
t = S[x];
S[x] = S[j];
S[j] = t;
}
i = j = 0;
}
// used by the encryption or decryption function
// the value returned, had to be XORed with the plaintext or the
// ciphertext to encrypt or decrypt.
UCHAR next_rand() {
++i;
j += S[i];
t = S[i]; S[i] = S[j]; S[j] = t;
t = S[i] + S[j];
return S[t];
}
void encrypt_decrypt(char *in,char *out,char*key){
int ks=strlen(key);
int i=0;
int size=strlen(in);
init(key,ks);
for(i=0;i<size;i++){
char c=out[i];
out[i]=((UCHAR)c) ^ next_rand();
//printf("%c",out[i]);
}
}
Sincerely,
Anass Kartit
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