public void TestTextEncryption()
{
// Test failed somehow.
// UPDATE: This test unexpectedly passed. I guess it's due to the BigInteger package update.
string message = "This is to test Paillier encryption and hopefully this message contains more than 2 blocks please please please please please please please please please please please pleaseplease please please pleaseplease please please please ";
PaillierPaddingMode padding = PaillierPaddingMode.Zeros;
var plaintext = Encoding.Default.GetBytes(message);
Paillier algorithm = new PaillierManaged();
for (int keySize = 384; keySize <= 1088; keySize += 8)
{
algorithm.KeySize = keySize;
algorithm.Padding = padding;
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
var ciphertext = encryptAlgorithm.EncryptData(plaintext);
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var candidatePlaintext = decryptAlgorithm.DecryptData(ciphertext);
var strip_zeros = StripTrailingZeros(candidatePlaintext, plaintext.Length);
CollectionAssert.AreEqual(plaintext, strip_zeros);
}
}
public void TestZero()
{
Paillier algorithm = new PaillierManaged();
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
for (int keySize = 384; keySize <= 1088; keySize += 8)
{
algorithm.KeySize = keySize;
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var z = new BigInteger(0);
var z_enc = encryptAlgorithm.EncryptData(z.getBytes());
var z_dec = decryptAlgorithm.DecryptData(z_enc);
var zero_array = new byte[z_dec.Length];
Array.Clear(zero_array, 0, zero_array.Length - 1);
CollectionAssert.AreEqual(zero_array, z_dec);
}
}
public void TestRandomBI()
{
// Failed test because of zeroes
Paillier algorithm = new PaillierManaged();
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
for (algorithm.KeySize = 384; algorithm.KeySize <= 1088; algorithm.KeySize += 8)
{
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var z = new BigInteger();
z.genRandomBits(new Random().Next(1, 2241), new RNGCryptoServiceProvider());
var z_enc = encryptAlgorithm.EncryptData(z.getBytes());
var z_dec = decryptAlgorithm.DecryptData(z_enc);
CollectionAssert.AreEqual(z.getBytes(), z_dec);
}
}
private static void TestZero()
{
Paillier algorithm = new PaillierManaged();
algorithm.KeySize = 384;
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var z = new BigInteger(0);
var z_enc = encryptAlgorithm.EncryptData(z.getBytes());
for (int i = 0; i < z_enc.Length; i++)
{
Console.Write(z_enc[i]);
}
Console.WriteLine();
var z_dec = decryptAlgorithm.DecryptData(z_enc);
for (int i = 0; i < z_dec.Length; i++)
{
Console.Write(z_dec[i]);
}
Console.WriteLine();
}
public static void TestTextEncryption(string message = "This is to test Paillier encryption and hopefully this message contains more than 2 blocks please please please please please please please please please please please pleaseplease please please pleaseplease please please please ",
int keySize = 384, PaillierPaddingMode padding = PaillierPaddingMode.Zeros)
{
Console.WriteLine();
Console.WriteLine("-- Testing string encryption ---");
var plaintext = Encoding.Default.GetBytes(message);
Paillier algorithm = new PaillierManaged();
algorithm.KeySize = keySize;
algorithm.Padding = padding;
var parametersXML = algorithm.ToXmlString(true);
Console.WriteLine("\n{0}\n", PrettifyXML(parametersXML));
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
var ciphertext = encryptAlgorithm.EncryptData(plaintext);
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var candidatePlaintext = decryptAlgorithm.DecryptData(ciphertext);
var strip_zeros = StripTrailingZeros(candidatePlaintext, plaintext.Length);
Console.WriteLine("Original string: '{0}'", message);
Console.WriteLine("Decrypted string: '{0}'", Encoding.Default.GetString(candidatePlaintext));
//Console.WriteLine("Byte arrays equal: {0}", plaintext.SequenceEqual(candidatePlaintext));
Console.WriteLine("Byte arrays equal: {0}", plaintext.SequenceEqual(strip_zeros));
Console.WriteLine();
}
public static bool TestAddition(int keySize)
{
Paillier algorithm = new PaillierManaged();
algorithm.KeySize = keySize;
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
string parametersXML = algorithm.ToXmlString(true);
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
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_bytes);
var B_enc_bytes = encryptAlgorithm.EncryptData(B_bytes);
// 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);
if (C_dec != A + B)
{
return(false);
}
return(true);
}
private static long ProfileEncryptedADD(int iterations, int keyl)
{
// clean up
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
var rnd = new Random();
// prepare and warm up
Paillier algorithm = new PaillierManaged();
algorithm.KeySize = keyl;
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
//string parametersXML = algorithm.ToXmlString(true);
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
var a = new BigInteger(rnd.Next(65536));
var a_bytes = encryptAlgorithm.EncryptData(a.getBytes());
var b = new BigInteger(rnd.Next(65536));
var b_bytes = encryptAlgorithm.EncryptData(b.getBytes());
var c_bytes = encryptAlgorithm.Addition(a_bytes, b_bytes);
var watch = Stopwatch.StartNew();
for (int i = 0; i < iterations; i++)
{
c_bytes = encryptAlgorithm.Addition(a_bytes, b_bytes);
}
watch.Stop();
return watch.Elapsed.Ticks;
}
public static void Rerun_SameNumbers(BigInteger A, BigInteger B)
{
Paillier algorithm = new PaillierManaged();
algorithm.KeySize = 384;
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
string parametersXML = algorithm.ToXmlString(true);
//Console.WriteLine("\n{0}\n", PrettifyXML(parametersXML));
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
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 TestRandomBI()
{
// To inspect the output, no idea why random number of zeroes appear in between decrypted bytes
// The original bytes and decrypted bytes are the same without zeroes
// Run several times, the appearance of zeroes seems unpredictale
Paillier algorithm = new PaillierManaged();
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
algorithm.KeySize = 384;
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
var z = new BigInteger();
var randomBit = new Random().Next(1, 2241);
z.genRandomBits(randomBit, new RNGCryptoServiceProvider());
var z_enc = encryptAlgorithm.EncryptData(z.getBytes());
var z_dec = decryptAlgorithm.DecryptData(z_enc);
for (int i = 0; i < z.getBytes().Length; i++)
{
Console.Write(z.getBytes()[i]);
}
Console.WriteLine();
int zeroCounter = z_dec.Length - z.getBytes().Length;
for (int i = 0; i < z_dec.Length; i++)
{
Console.Write(z_dec[i]);
}
Console.WriteLine();
Console.WriteLine
("Number of zero: {0}" +
"\nNumber of original bytes: {1}" +
"\nNumber of decrypted bytes: {2}" +
"\nNumber of bits used to gen random bytes: {3}"
,zeroCounter, z.getBytes().Length, z_dec.Length, randomBit);
}
public static Boolean TestAddition()
{
Paillier algorithm = new PaillierManaged();
algorithm.KeySize = 384;
algorithm.Padding = PaillierPaddingMode.LeadingZeros;
string parametersXML = algorithm.ToXmlString(true);
//Console.WriteLine("\n{0}\n", PrettifyXML(parametersXML));
Paillier encryptAlgorithm = new PaillierManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
Paillier decryptAlgorithm = new PaillierManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
Random random = new Random();
BigInteger A = new BigInteger(random.Next(32768));
BigInteger B = new BigInteger(random.Next(32768));
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);
// strip off trailing zeros
//byte[] A_dec_stripped = StripTrailingZeros(A_dec_bytes, A_bytes.Length);
//byte[] B_dec_stripped = StripTrailingZeros(B_dec_bytes, B_bytes.Length);
//byte[] C_dec_stripped = StripTrailingZeros(C_dec_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);
if (C_dec != A + B)
{
Console.WriteLine();
Console.WriteLine("***********Error Encountered!!***");
Console.WriteLine("\n{0}\n", PrettifyXML(parametersXML));
// 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());
Console.WriteLine();
Console.WriteLine("Re-run the numbers with different key..");
Rerun_SameNumbers(A, B);
Console.WriteLine();
Console.WriteLine("Re-run the same key with different numbers..");
Rerun_SameKey(encryptAlgorithm, decryptAlgorithm);
Console.WriteLine();
Console.WriteLine("Re-run with same key and same numbers..");
Rerun_SamekeyNumber(encryptAlgorithm, decryptAlgorithm, A, B);
Console.WriteLine();
return(false);
}
return(true);
}