public static void Rerun_SamekeyNumber(Paillier encryptAlgorithm, Paillier decryptAlgorithm,
BigInteger A, BigInteger B)
{
byte[] A_bytes = A.getBytes();
byte[] B_bytes = B.getBytes();
//encrypt A and B
byte[] A_enc_bytes = encryptAlgorithm.EncryptData(A.getBytes());
byte[] B_enc_bytes = encryptAlgorithm.EncryptData(B.getBytes());
// decrypt A and B
byte[] A_dec_bytes = decryptAlgorithm.DecryptData(A_enc_bytes);
byte[] B_dec_bytes = decryptAlgorithm.DecryptData(B_enc_bytes);
// getting homomorphic addition result
byte[] C_enc_bytes = encryptAlgorithm.Addition(A_enc_bytes, B_enc_bytes);
byte[] C_dec_bytes = decryptAlgorithm.DecryptData(C_enc_bytes);
// convert to BigInteger
BigInteger A_dec = new BigInteger(A_dec_bytes);
BigInteger B_dec = new BigInteger(B_dec_bytes);
BigInteger C_dec = new BigInteger(C_dec_bytes);
// printing out
Console.WriteLine("Plaintext: {0} + {1} = {2}", A.ToString(), B.ToString(), (A + B).ToString());
Console.WriteLine("Encrypted: {0} + {1} = {2}", A_dec.ToString(), B_dec.ToString(), C_dec.ToString());
}
public static void Rerun_SameKey(Paillier encryptAlgorithm, Paillier decryptAlgorithm)
{
var random = new Random();
var A = new BigInteger(random.Next(32768));
var B = new BigInteger(random.Next(32768));
var A_bytes = A.getBytes();
var B_bytes = B.getBytes();
//encrypt A and B
var A_enc_bytes = encryptAlgorithm.EncryptData(A.getBytes());
var B_enc_bytes = encryptAlgorithm.EncryptData(B.getBytes());
// decrypt A and B
var A_dec_bytes = decryptAlgorithm.DecryptData(A_enc_bytes);
var B_dec_bytes = decryptAlgorithm.DecryptData(B_enc_bytes);
// getting homomorphic addition result
var C_enc_bytes = encryptAlgorithm.Addition(A_enc_bytes, B_enc_bytes);
var C_dec_bytes = decryptAlgorithm.DecryptData(C_enc_bytes);
// convert to BigInteger
var A_dec = new BigInteger(A_dec_bytes);
var B_dec = new BigInteger(B_dec_bytes);
var C_dec = new BigInteger(C_dec_bytes);
// printing out
Console.WriteLine("Plaintext: {0} + {1} = {2}", A.ToString(), B.ToString(), (A + B).ToString());
Console.WriteLine("Encrypted: {0} + {1} = {2}", A_dec.ToString(), B_dec.ToString(), C_dec.ToString());
}
public void TestNegativeCases()
{
{
var algorithm = new Paillier
{
KeySize = 384
};
//Test negative number
var z = new BigInteger(8);
var z_enc_bytes = algorithm.EncryptData(z);
var z_dec = algorithm.DecryptData(z_enc_bytes);
Assert.Equal(z, z_dec);
//Test positive number
var z_2 = new BigInteger(10);
var z_enc_bytes_2 = algorithm.EncryptData(z_2);
var z_dec_2 = algorithm.DecryptData(z_enc_bytes_2);
Assert.Equal(z_2, z_dec_2);
//Test addition of positive and negative numbers
var z_enc_addition = algorithm.Addition(z_enc_bytes, z_enc_bytes_2);
var z_addition = algorithm.DecryptData(z_enc_addition);
Assert.Equal(z + z_2, z_addition);
//Test subtraction of positive and negative numbers
var z_enc_subtraction = algorithm.Subtraction(z_enc_bytes, z_enc_bytes_2);
var z_subtraction = algorithm.DecryptData(z_enc_subtraction);
Assert.Equal(z - z_2, z_subtraction);
algorithm.Dispose();
}
}
public void TestNegativeFloatingPoint()
{
{
var algorithm = new Paillier
{
KeySize = 384
};
//Test 0 > plaintext > -1
var z = new BigFraction(BigInteger.Parse("-1001"), BigInteger.Parse("100"));
var z_enc_bytes = algorithm.EncryptData(z);
var z_dec = algorithm.DecryptData(z_enc_bytes);
Assert.Equal(z, z_dec);
//Test plaintext < -1
var z_2 = new BigFraction(BigInteger.Parse("-1000000001"), BigInteger.Parse("100"));
var z_2_enc_bytes = algorithm.EncryptData(z_2);
var z_2_dec = algorithm.DecryptData(z_2_enc_bytes);
Assert.Equal(z_2, z_2_dec);
//Test addition
var z_enc_addition = algorithm.Addition(z_enc_bytes, z_2_enc_bytes);
var z_addition = algorithm.DecryptData(z_enc_addition);
Assert.Equal(z + z_2, z_addition);
algorithm.Dispose();
}
}
public void TestZero()
{
for (var keySize = 384; keySize <= 1088; keySize += 8)
{
var algorithm = new Paillier
{
KeySize = keySize
};
var encryptAlgorithm = new Paillier();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
var decryptAlgorithm = new Paillier();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var z = new BigInteger(0);
var r = new BigInteger(rnd.Next(1, 65536));
var z_enc = encryptAlgorithm.EncryptData(z);
var z_dec = decryptAlgorithm.DecryptData(z_enc);
Assert.Equal(z, z_dec);
var r_enc = encryptAlgorithm.EncryptData(r);
var zar_enc = decryptAlgorithm.Addition(z_enc, r_enc);
var raz_enc = decryptAlgorithm.Addition(r_enc, z_enc);
var zar = decryptAlgorithm.DecryptData(zar_enc);
var raz = decryptAlgorithm.DecryptData(raz_enc);
Assert.Equal(r, zar);
Assert.Equal(r, raz);
algorithm.Dispose();
encryptAlgorithm.Dispose();
decryptAlgorithm.Dispose();
}
}
public void TestSpecificCases()
{
{
var algorithm = new Paillier
{
KeySize = 384
};
var z = new BigFraction(BigInteger.Parse("1000"), BigInteger.Parse("1"));
var z_enc_bytes = algorithm.EncryptData(z);
var z_dec = algorithm.DecryptData(z_enc_bytes);
Assert.Equal(z, z_dec);
algorithm.Dispose();
}
{
// based on https://github.com/bazzilic/PaillierExt/issues/15
for (var keySize = 384; keySize <= 1088; keySize += 8)
{
var algorithm = new Paillier
{
KeySize = keySize
};
var sum = algorithm.EncryptData(new BigInteger(0));
var one = algorithm.EncryptData(new BigInteger(1));
for (var i = 0; i < 1000; i++)
{
sum = algorithm.Addition(sum, one);
}
var sums = algorithm.DecryptData(sum);
Assert.Equal(sums, new BigInteger(1000));
algorithm.Dispose();
}
}
}
public void TestMultiplication_BatchFrac()
{
var rnd = new Random();
var rng = new RNGCryptoServiceProvider();
for (var i = 0; i < Globals.iterations; i++)
{
for (var keySize = 384; keySize <= 1088; keySize += 8)
{
var algorithm = new Paillier
{
KeySize = keySize
};
var encryptAlgorithm = new Paillier();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
var decryptAlgorithm = new Paillier();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
BigFraction a, b;
do
{
var n = new BigInteger().GenRandomBits(rnd.Next(1, algorithm.KeyStruct.getMaxPlaintextBits() / 4), rng);
var d = ((rnd.Next() % 2) + 1) * 10;
a = new BigFraction(n, d);
} while (a == 0);
do
{
var n = new BigInteger().GenRandomBits(rnd.Next(1, algorithm.KeyStruct.getMaxPlaintextBits() / 4), rng);
var d = ((rnd.Next() % 2) + 1) * 10;
b = new BigFraction(n, d);
} while (b == 0);
if (rnd.Next() % 2 == 0) // randomly change signs
{
a = -a;
}
if (rnd.Next() % 2 == 0)
{
b = -b;
}
var a_enc = encryptAlgorithm.EncryptData(a);
var b_enc = encryptAlgorithm.EncryptData(b);
// Addition
var aab_enc = decryptAlgorithm.Addition(a_enc, b_enc);
var aab_dec = decryptAlgorithm.DecryptData(aab_enc);
Assert.True(aab_dec == a + b, $"{Environment.NewLine}{Environment.NewLine}" +
$"Algorithm parameters (TRUE):{Environment.NewLine}" +
$"{algorithm.ToXmlString(true)}{Environment.NewLine}{Environment.NewLine}" +
$"a : {a}{Environment.NewLine}{Environment.NewLine}" +
$"b : {b}{Environment.NewLine}{Environment.NewLine}" +
$"a + b : {a + b}{Environment.NewLine}{Environment.NewLine}" +
$"aab_dec : {aab_dec}");
var baa_enc = decryptAlgorithm.Addition(b_enc, a_enc); // verify transitivity
var baa_dec = decryptAlgorithm.DecryptData(baa_enc);
Assert.True(baa_dec == a + b, $"{Environment.NewLine}{Environment.NewLine}" +
$"Algorithm parameters (TRUE):{Environment.NewLine}" +
$"{algorithm.ToXmlString(true)}{Environment.NewLine}{Environment.NewLine}" +
$"a : {a}{Environment.NewLine}{Environment.NewLine}" +
$"b : {b}{Environment.NewLine}{Environment.NewLine}" +
$"b + a : {b + a}{Environment.NewLine}{Environment.NewLine}" +
$"baa_dec : {baa_dec}");
algorithm.Dispose();
encryptAlgorithm.Dispose();
decryptAlgorithm.Dispose();
}
}
}