/**
* Perform the central password hashing step in the bcrypt scheme
*
* @param password the password to hash
* @param salt the binary salt to hash with the password
* @param log_rounds the binary logarithm of the number of rounds of hashing to apply
* @return an array containing the binary hashed password
*/
private byte[] crypt_raw(byte password[], byte salt[], int log_rounds) {
int rounds, i, j;
int cdata[] = (int[]) bf_crypt_ciphertext.clone();
int clen = cdata.length;
byte ret[];
if (log_rounds < 4 || log_rounds > 31)
throw new IllegalArgumentException("Bad number of rounds");
rounds = 1 << log_rounds;
if (salt.length != BCRYPT_SALT_LEN) throw new IllegalArgumentException("Bad salt length");
init_key();
ekskey(salt, password);
for (i = 0; i < rounds; i++) {
key(password);
key(salt);
}
for (i = 0; i < 64; i++) {
for (j = 0; j < (clen >> 1); j++) encipher(cdata, j << 1);
}
ret = new byte[clen * 4];
for (i = 0, j = 0; i < clen; i++) {
ret[j++] = (byte) ((cdata[i] >> 24) & 0xff);
ret[j++] = (byte) ((cdata[i] >> 16) & 0xff);
ret[j++] = (byte) ((cdata[i] >> 8) & 0xff);
ret[j++] = (byte) (cdata[i] & 0xff);
}
return ret;
}
/**
* Key the Blowfish cipher
*
* @param key an array containing the key
*/
private void key(byte key[]) {
int i;
int koffp[] = {0};
int lr[] = {0, 0};
int plen = P.length, slen = S.length;
for (i = 0; i < plen; i++) P[i] = P[i] ^ streamtoword(key, koffp);
for (i = 0; i < plen; i += 2) {
encipher(lr, 0);
P[i] = lr[0];
P[i + 1] = lr[1];
}
for (i = 0; i < slen; i += 2) {
encipher(lr, 0);
S[i] = lr[0];
S[i + 1] = lr[1];
}
}