void
derive_u_ripemd160(const uint8 *key, int keyLength, const uint8 *salt,
int saltLength, int iterations, uint8 *u, int b)
{
uint8 j[RIPEMD160_DIGESTSIZE], k[RIPEMD160_DIGESTSIZE];
uint8 init[128];
uint8 counter[4];
int c, i;
/* iteration 1 */
memset(counter, 0, 4);
counter[3] = (char) b;
memcpy(init, salt, saltLength); /* salt */
memcpy(&init[saltLength], counter, 4); /* big-endian block number */
hmac_ripemd160(key, keyLength, init, saltLength + 4, j);
memcpy(u, j, RIPEMD160_DIGESTSIZE);
/* remaining iterations */
for (c = 1; c < iterations; c++) {
hmac_ripemd160(key, keyLength, j, RIPEMD160_DIGESTSIZE, k);
for (i = 0; i < RIPEMD160_DIGESTSIZE; i++) {
u[i] ^= k[i];
j[i] = k[i];
}
}
/* Prevent possible leaks. */
memset(j, 0, sizeof(j));
memset(k, 0, sizeof(k));
}
void derive_u_ripemd160 (char *pwd, int pwd_len, char *salt, int salt_len, int iterations, char *u, int b)
{
char j[RIPEMD160_DIGESTSIZE], k[RIPEMD160_DIGESTSIZE];
char init[128];
char counter[4];
int c, i;
/* iteration 1 */
memset (counter, 0, 4);
counter[3] = (char) b;
memcpy (init, salt, salt_len); /* salt */
memcpy (&init[salt_len], counter, 4); /* big-endian block number */
hmac_ripemd160 (pwd, pwd_len, init, salt_len + 4, j);
memcpy (u, j, RIPEMD160_DIGESTSIZE);
/* remaining iterations */
for (c = 1; c < iterations; c++)
{
hmac_ripemd160 (pwd, pwd_len, j, RIPEMD160_DIGESTSIZE, k);
for (i = 0; i < RIPEMD160_DIGESTSIZE; i++)
{
u[i] ^= k[i];
j[i] = k[i];
}
}
/* Prevent possible leaks. */
burn (j, sizeof(j));
burn (k, sizeof(k));
}
