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/*
* Verse encryption routines. Implements RSA encryption/decryption plus fast XORx.
*/
#if !defined(V_GENERATE_FUNC_MODE)
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "verse.h"
#include "v_pack.h"
#include "v_bignum.h"
#include "v_encryption.h"
#define BITS V_ENCRYPTION_LOGIN_KEY_BITS /* Save some typing. */
extern void v_prime_set_random(VBigDig *x);
extern void v_prime_set_table(VBigDig *x, int i);
const uint8 * v_e_data_create_key(void) /* possibly the worst key gen ever */
{
static unsigned int counter = 0;
static uint8 buffer[V_ENCRYPTION_DATA_KEY_SIZE];
unsigned int i, temp;
for(i = 0; i < V_ENCRYPTION_DATA_KEY_SIZE; i++)
{
counter++;
temp = (counter << 13) ^ counter;
temp = (temp * (temp * temp * 15731 + 789221) + 1376312589) & 0x7fffffff;
buffer[i] = temp;
}
/* FIXME: This really isn't very pretty. */
buffer[0] &= 0x3f; /* Make sure top word is... Low. For RSA compatibility. */
/* memset(buffer, 0, sizeof buffer);
fprintf(stderr, "**WARNING: XOR data encryption disabled\n");
*/
return buffer;
}
void v_e_data_encrypt_command(uint8 *packet, size_t packet_size, const uint8 *command, size_t command_size, const uint8 *key)
{
uint32 pos, i;
vnp_raw_unpack_uint32(packet, &pos);
/* printf("encrypting packet %u", pos);*/
pos = key[pos % V_ENCRYPTION_DATA_KEY_SIZE] + packet_size;
/* printf(" -> pos=%u (size %u)", pos, packet_size);
printf(", key begins: [");
for(i = 0; i < 16; i++)
printf(" %02X", key[(pos + i) % V_ENCRYPTION_DATA_KEY_SIZE]);
printf(" ]\n");
*/
for(i = 0; i < command_size; i++)
packet[packet_size + i] = command[i] ^ key[(i + pos) % V_ENCRYPTION_DATA_KEY_SIZE];
}
void v_e_data_decrypt_packet(uint8 *to, const uint8 *from, size_t size, const uint8 *key)
{
uint32 pos, i;
vnp_raw_unpack_uint32(from, &pos);
/* printf("decrypting packet %u", pos);*/
pos = key[pos % V_ENCRYPTION_DATA_KEY_SIZE];
/* printf(" -> pos=%u", pos);
printf(", key begins: [");
for(i = 0; i < 16; i++)
printf(" %02X", key[(i + pos) % V_ENCRYPTION_DATA_KEY_SIZE]);
printf(" ]\n");
*/ for(i = 0; i < 4; i++)
to[i] = from[i];
for(i = 4; i < size; i++)
to[i] = from[i] ^ key[(i + pos) % V_ENCRYPTION_DATA_KEY_SIZE];
}
#endif
/* From Knuth. Computes multiplicative inverse of u, modulo v. */
void v_e_math_inv(VBigDig *inv, const VBigDig *u, const VBigDig *v)
{
VBigDig VBIGNUM(u1, 2*BITS), VBIGNUM(u3, 2*BITS), VBIGNUM(v1, 2*BITS), VBIGNUM(v3, 2 *BITS),
VBIGNUM(t1, 2*BITS), VBIGNUM(t3, 2*BITS), VBIGNUM(q, 2*BITS), VBIGNUM(w, 2*BITS);
int iter = 1;
v_bignum_set_one(u1);
v_bignum_set_bignum(u3, u);
v_bignum_set_zero(v1);
v_bignum_set_bignum(v3, v);
while(!v_bignum_eq_zero(v3))
{
v_bignum_set_bignum(q, u3);
v_bignum_div(q, v3, t3);
v_bignum_set_bignum(w, q);
v_bignum_mul(w, v1);
v_bignum_set_bignum(t1, u1);
v_bignum_add(t1, w);
v_bignum_set_bignum(u1, v1);
v_bignum_set_bignum(v1, t1);
v_bignum_set_bignum(u3, v3);
v_bignum_set_bignum(v3, t3);
iter = -iter;
}
if(iter < 0)
{
v_bignum_set_bignum(inv, v);
v_bignum_sub(inv, u1);
}
else
v_bignum_set_bignum(inv, u1);
}
void v_e_connect_create_key(uint8 *private_key, uint8 *public_key, uint8 *n)
{
VBigDig VBIGNUM(p, BITS / 2), VBIGNUM(q, BITS / 2), VBIGNUM(qmo, BITS / 2), VBIGNUM(phi, BITS),
VBIGNUM(pub, BITS), VBIGNUM(priv, BITS), VBIGNUM(mod, BITS);
#if !defined _WIN32
/* FIXME: This is a security backdoor. Intent is simply to save time during testing. */
if(getenv("VERSE_NORSA") != NULL)
{
printf("VERSE: Found the NORSA envvar, using constant keys\n");
v_prime_set_table(p, 0);
v_prime_set_table(q, 1);
goto compute_phi;
}
#endif
/* printf("find prime p\n");*/
v_prime_set_random(p);
/* printf("find prime q\n");*/
v_prime_set_random(q);
compute_phi:
/* printf("done, computing key\n");*/
/* printf("p=");
v_bignum_print_hex_lf(p);
printf("q=");
v_bignum_print_hex_lf(q);
*/ v_bignum_set_bignum(phi, p);
v_bignum_sub_digit(phi, 1);
v_bignum_set_bignum(qmo, q);
v_bignum_sub_digit(qmo, 1);
v_bignum_mul(phi, qmo);
/* printf("phi=");
v_bignum_print_hex_lf(phi);
*/ v_bignum_set_string_hex(pub, "0x10001");
v_e_math_inv(priv, pub, phi);
/* printf(" pub=");
v_bignum_print_hex_lf(pub);
printf("priv=");
v_bignum_print_hex_lf(priv);
*/
v_bignum_set_bignum(mod, p);
v_bignum_mul(mod, q);
/* printf(" mod=");
v_bignum_print_hex_lf(mod);
printf("key-creation finished\n");
*/ /* Write out the keys. */
v_bignum_raw_export(pub, public_key);
v_bignum_raw_export(priv, private_key);
v_bignum_raw_export(mod, n);
}
void v_e_connect_encrypt(uint8 *output, const uint8 *data, const uint8 *key, const uint8 *key_n)
{
VBigDig VBIGNUM(packet, BITS), VBIGNUM(expo, BITS), VBIGNUM(mod, BITS);
v_bignum_raw_import(packet, data);
v_bignum_raw_import(expo, key);
v_bignum_raw_import(mod, key_n);
/* Verify that data is less than the modulo, this is a prerequisite for encryption. */
if(!v_bignum_gte(mod, packet))
{
printf("*** WARNING. Data is not less than modulo, as it should be--encryption will break!\n");
printf(" RSA modulo: ");
v_bignum_print_hex_lf(mod);
printf(" RSA data: ");
v_bignum_print_hex_lf(packet);
}
/* printf("RSA key: ");
v_bignum_print_hex_lf(expo);
printf("RSA mod: ");
v_bignum_print_hex_lf(mod);
printf("RSA in: ");
v_bignum_print_hex_lf(packet);
printf("bits in packet: %d, ", v_bignum_bit_msb(packet) + 1);
printf("bits in modulo: %d\n", v_bignum_bit_msb(mod) + 1);
*/ v_bignum_pow_mod(packet, expo, mod); /* Blam. */
/* printf("RSA out: ");
v_bignum_print_hex_lf(packet);
*/ v_bignum_raw_export(packet, output);
}
#if defined CRYPTALONE
void v_encrypt_test(void)
{
uint8 k_priv[BITS / 8], k_pub[BITS / 8], k_n[BITS / 8], cipher[BITS / 8], plain[BITS / 8], decode[BITS / 8], i;
printf("testing RSA-crypto\n");
v_e_connect_create_key(k_pub, k_priv, k_n);
/* exit(0);*/
printf("key pair generated, encrypting something\n");
memset(plain, 0, sizeof plain);
strcpy(plain, "This is some text to encrypt, to give it something to chew on.");
printf("plain: %02X (%u)\n", plain[0], strlen(plain));
v_e_connect_encrypt(cipher, plain, k_pub, k_n);
printf("plain: %02X, cipher: %02X\n", plain[0], cipher[0]);
v_e_connect_encrypt(decode, cipher, k_priv, k_n);
printf("decoded: %02X: '", decode[0]);
for(i = 0; decode[i] != 0; i++)
putchar(decode[i]);
printf("'\n");
/* printf("\npublic key: ");
v_bignum_print_hex_lf(k_public);
printf("private key: ");
v_bignum_print_hex_lf(k_private);
v_bignum_set_string(msg, "123");
gettimeofday(&t1, NULL);
v_bignum_pow_mod(msg, k_private, k_n);
gettimeofday(&t2, NULL);
printf("encrypted: ");
v_bignum_print_hex_lf(msg);
printf("encrypted %u bits in %g s\n", BITS, t2.tv_sec - t1.tv_sec + 1.0E-6 * (t2.tv_usec - t1.tv_usec));
gettimeofday(&t1, NULL);
v_bignum_pow_mod(msg, k_public, k_n);
gettimeofday(&t2, NULL);
printf("decrypted: ");
v_bignum_print_hex_lf(msg);
printf("decrypted %u bits in %g s\n", BITS, t2.tv_sec - t1.tv_sec + 1.0E-6 * (t2.tv_usec - t1.tv_usec));
exit(0);
*//* v_e_encrypt(cipher, plain, &k_private, &k_n);
printf("encrypted data: ");
for(i = 0; i < sizeof cipher; i++)
printf("%c", isalnum(cipher[i]) ? cipher[i] : '?');
printf("\n\n");
printf("decrypting\n");
v_e_encrypt(decode, cipher, &k_public, &k_n);
printf("decrypted data: ");
for(i = 0; i < sizeof cipher; i++)
printf("%c", isalnum(decode[i]) ? decode[i] : '?');
printf("\n\n");
*/
}
int main(void)
{
v_encrypt_test();
return 0;
}
#endif
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