package org.ripple.power.utils;
import org.ripple.power.collection.LongArray;
public class HMAC {
private SHA512[] _baseHash;
private SHA512 _resultHash;
private boolean _updated = false;
public HMAC(LongArray key) {
int i = 0;
int bs = SHA512.blockSize / 32;
long[][] exKey = new long[2][bs];
this._baseHash = new SHA512[] { new SHA512(), new SHA512() };
if (key.length > bs) {
key = SHA512.hash(key);
}
for (i = 0; i < bs; i++) {
exKey[0][i] = (key.get(i) ^ 0x36363636);
exKey[1][i] = (key.get(i) ^ 0x5C5C5C5C);
}
this._baseHash[0].update(exKey[0]);
this._baseHash[1].update(exKey[1]);
this._resultHash = this._baseHash[0];
}
public LongArray mac(Object data) {
return encrypt(data);
}
public LongArray encrypt(Object data) {
if (!this._updated) {
this.update(data);
return this.digest();
} else {
throw new RuntimeException(
"encrypt on already updated hmac called!");
}
}
public void reset() {
this._updated = false;
this._resultHash = this._baseHash[0];
}
public void update(Object d) {
this._updated = true;
this._resultHash.update(d);
}
public LongArray digest() {
LongArray w = this._resultHash._finalize();
LongArray result = this._baseHash[1].update(w)._finalize();
this.reset();
return result;
}
}