public String decipher(List <BigInteger> cipher, MHPrivateKey key)
{
String decrypted = "";
BigInteger temp = BigInteger.ValueOf(0);
int tmp = 0;
BigInteger bits = BigInteger.ValueOf(0);
for (int i = 0; i < cipher.Count; i++)
{
temp = cipher.ElementAt(i);
int bitlen = temp.BitLength;
int ff = 0;
while (bitlen < (int)Math.Pow(2, ff))
{
ff++;
}
if (ff > bitlen)
{
bitlen = ff;
}
for (int j = 0; j < bitlen; j++)
{
if (temp.Mod(BigInteger.ValueOf(2)).CompareTo(BigInteger.ValueOf(1)) == 0)
{
bits = bits.Add(key.w1.Multiply(BigInteger.ValueOf((long)Math.Pow(2, j))));
}
temp = temp.ShiftRight(1);
}
bits = bits.Mod(key.n);
List <BigInteger> list = (List <BigInteger>)key.a;
BigInteger temper;
int k = key.a.Count - 1;
while (k >= 0)
{
temper = list.ElementAt(k);
if (bits.CompareTo(temper) > -1)
{
tmp += (int)Math.Pow(2, k);
bits = bits.Subtract(temper);
}
k--;
}
decrypted += (binaryToChar(Convert.ToString(tmp, 2))).ToString();
bits = BigInteger.ValueOf(0);
tmp = 0;
}
return(decrypted);
}
public MHKey()
{
generator gen = new generator(8);
BigInteger w = gen.w;
e = new List <BigInteger>();
for (int i = 0; i < gen.a.Count; i++)
{
e.Add(w.Multiply(gen.a.ElementAt(i)).Mod(gen.n)); // w*a Mod n ..
}
BigInteger w1 = BigInteger.ValueOf(1);
BigInteger one = BigInteger.ValueOf(2);
while (one.IntValue != 1)
{
w1 = w1.Add(BigInteger.ValueOf(1)).Mod(gen.n);
one = w.Multiply(w1).Mod(gen.n);
}
privateKey = new MHPrivateKey(gen.a, w.ModInverse(gen.n), gen.n);
}
