private void IsValid()
{
// test valid key pairs
NTRUParameters[] paramSets = new NTRUParameters[]
{
(NTRUParameters)NTRUParamSets.APR2011439.Clone(),
(NTRUParameters)NTRUParamSets.APR2011439FAST.Clone(),
(NTRUParameters)NTRUParamSets.APR2011743.Clone(),
(NTRUParameters)NTRUParamSets.APR2011743FAST.Clone(),
(NTRUParameters)NTRUParamSets.EES1087EP2.Clone(),
(NTRUParameters)NTRUParamSets.EES1087EP2FAST.Clone(),
(NTRUParameters)NTRUParamSets.EES1499EP1.Clone(),
(NTRUParameters)NTRUParamSets.EES1499EP1FAST.Clone(),
};
foreach (NTRUParameters ep in paramSets)
{
NTRUKeyGenerator ntru = new NTRUKeyGenerator(ep);
NTRUKeyPair kp1 = (NTRUKeyPair)ntru.GenerateKeyPair();
if (!Compare.True(kp1.IsValid()))
throw new Exception("NtruKeyPair generated key pair is invalid!");
}
}
private void Encode(NTRUParameters param)
{
NTRUKeyGenerator ntru = new NTRUKeyGenerator(param);
NTRUKeyPair kp = (NTRUKeyPair)ntru.GenerateKeyPair();
byte[] priv = ((NTRUPrivateKey)kp.PrivateKey).ToBytes();
byte[] pub = ((NTRUPublicKey)kp.PublicKey).ToBytes();
NTRUKeyPair kp2 = new NTRUKeyPair(new NTRUPublicKey(pub), new NTRUPrivateKey(priv));
if (!Compare.Equals(kp.PublicKey, kp2.PublicKey))
throw new Exception("EncryptionKey: public key comparison test failed!");
if (!Compare.Equals(kp.PrivateKey, kp2.PrivateKey))
throw new Exception("EncryptionKey: private key comparison test failed!");
MemoryStream bos1 = new MemoryStream();
MemoryStream bos2 = new MemoryStream();
((NTRUPrivateKey)kp.PrivateKey).WriteTo(bos1);
((NTRUPublicKey)kp.PublicKey).WriteTo(bos2);
MemoryStream bis1 = new MemoryStream(bos1.ToArray());
MemoryStream bis2 = new MemoryStream(bos2.ToArray());
NTRUKeyPair kp3 = new NTRUKeyPair(new NTRUPublicKey(bis2), new NTRUPrivateKey(bis1));
if (!Compare.Equals(kp.PublicKey, kp3.PublicKey))
throw new Exception("EncryptionKey: public key comparison test failed!");
if (!Compare.Equals(kp.PrivateKey, kp3.PrivateKey))
throw new Exception("EncryptionKey: private key comparison test failed!");
}
private void DigestTest()
{
CSPRng rng = new CSPRng();
NTRUParameters param = (NTRUParameters)NTRUParamSets.EES1087EP2.DeepCopy();
for (int i = 0; i < 3; i++)
{
if (i == 0)
param.Digest = Digests.Blake512;//blake512
else if (i == 1)
param.Digest = Digests.Keccak512;//keccak512
else
param.Digest = Digests.Skein512;//skein512
NTRUKeyPair kp;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param))
kp = (NTRUKeyPair)kg.GenerateKeyPair();
using (NTRUEncrypt ntru = new NTRUEncrypt(param))
{
byte[] plainText = rng.GetBytes(32);
ntru.Initialize(kp.PublicKey);
byte[] encrypted = ntru.Encrypt(plainText);
ntru.Initialize(kp);
byte[] decrypted = ntru.Decrypt(encrypted);
if (!Compare.AreEqual(plainText, decrypted))
throw new Exception("NtruEncryptTest: digest test failed!");
}
}
}
private void GetOutputLength()
{
NTRUParameters[] paramSets = new NTRUParameters[]
{
(NTRUParameters)NTRUParamSets.APR2011439.DeepCopy(),
(NTRUParameters)NTRUParamSets.APR2011439FAST.DeepCopy(),
(NTRUParameters)NTRUParamSets.APR2011743.DeepCopy(),
(NTRUParameters)NTRUParamSets.APR2011743FAST.DeepCopy(),
(NTRUParameters)NTRUParamSets.EES1087EP2.DeepCopy(),
(NTRUParameters)NTRUParamSets.EES1171EP1.DeepCopy(),
(NTRUParameters)NTRUParamSets.EES1499EP1.DeepCopy(),
};
byte[] plainText = ByteUtils.GetBytes("secret encrypted text");
foreach (NTRUParameters param in paramSets)
{
NTRUKeyPair kp;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param))
kp = (NTRUKeyPair)kg.GenerateKeyPair();
NTRUEncrypt ntru = new NTRUEncrypt(param);
ntru.Initialize(kp.PublicKey);
byte[] encrypted = ntru.Encrypt(plainText);
if (!Compare.Equals(param.GetOutputLength(), encrypted.Length))
throw new Exception("NtruEncryptTest: output length test failed!");
}
}
// tests key pair generation from a passphrase
private void GenerateKeyPair()
{
NTRUParameters param = (NTRUParameters)NTRUParamSets.EES1087EP2FAST.DeepCopy();
byte[] passphrase = Encoding.Unicode.GetBytes("password123");
byte[] salt = new CSPRng().GetBytes(16);
NTRUKeyPair kp1;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param, false)) // note: parallel must be turned off with passphrase prng
kp1 = (NTRUKeyPair)kg.GenerateKeyPair(passphrase, salt);
NTRUKeyPair kp2;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param, false))
kp2 = (NTRUKeyPair)kg.GenerateKeyPair(passphrase, salt);
NTRUEncrypt ntru = new NTRUEncrypt(param);
NTRUEncrypt ntru2 = new NTRUEncrypt(NTRUParamSets.EES1087EP2FAST);
if (!kp1.Equals(kp2))
throw new Exception("NtruEncryptTest: key pair generation test failed!");
salt = ntru.GenerateSalt();
NTRUKeyPair kp3;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param, false))
kp3 = (NTRUKeyPair)kg.GenerateKeyPair(passphrase, salt);
if (!Compare.False(kp1.Equals(kp3)))
throw new Exception("NtruEncryptTest: key pair generation test failed!");
}
// params must have df1..df3 and dr1..dr3 set as well as df and dr
private void EncryptDecrypt(NTRUParameters param)
{
NTRUKeyPair kp;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param))
kp = (NTRUKeyPair)kg.GenerateKeyPair();
NTRUEncrypt ntru = new NTRUEncrypt(param);
TextTest(ntru, kp, param);
// sparse/dense
param.Sparse = !param.Sparse;
TextTest(ntru, kp, param);
param.Sparse = !param.Sparse;
EmptyTest(ntru, kp, param);
MaxLength(ntru, kp, param);
TooLong(ntru, kp, param);
kp.Dispose();
ntru.Dispose();
}
static double Encrypt(int Iterations, NTRUParameters Param)
{
NTRUKeyGenerator mkgen = new NTRUKeyGenerator(Param);
IAsymmetricKeyPair akp = mkgen.GenerateKeyPair();
byte[] ptext = new CSPRng().GetBytes(64);
byte[] ctext;
Stopwatch runTimer = new Stopwatch();
using (NTRUEncrypt mpe = new NTRUEncrypt(Param))
{
mpe.Initialize(akp.PublicKey);
runTimer.Start();
for (int i = 0; i < Iterations; i++)
ctext = mpe.Encrypt(ptext);
runTimer.Stop();
}
return runTimer.Elapsed.TotalMilliseconds;
}
static double Decrypt(int Iterations, NTRUParameters Param)
{
NTRUKeyGenerator mkgen = new NTRUKeyGenerator(Param);
IAsymmetricKeyPair akp = mkgen.GenerateKeyPair();
byte[] ptext = new CSPRng().GetBytes(64);
byte[] rtext = new byte[64];
byte[] ctext;
Stopwatch runTimer = new Stopwatch();
using (NTRUEncrypt mpe = new NTRUEncrypt(Param))
{
mpe.Initialize(akp.PublicKey);
ctext = mpe.Encrypt(ptext);
mpe.Initialize(akp);
runTimer.Start();
for (int i = 0; i < Iterations; i++)
rtext = mpe.Decrypt(ctext);
runTimer.Stop();
}
//if (!Compare.AreEqual(ptext, rtext))
// throw new Exception("Encryption test: decryption failure!");
return runTimer.Elapsed.TotalMilliseconds;
}
static double KeyGenerator(int Iterations, NTRUParameters Param)
{
NTRUKeyGenerator mkgen = new NTRUKeyGenerator(Param);
IAsymmetricKeyPair akp;
Stopwatch runTimer = new Stopwatch();
runTimer.Start();
for (int i = 0; i < Iterations; i++)
akp = mkgen.GenerateKeyPair();
runTimer.Stop();
return runTimer.Elapsed.TotalMilliseconds;
}
static void FullCycle()
{
NTRUParameters mpar = NTRUParamSets.APR2011439FAST; //APR2011743FAST
NTRUKeyGenerator mkgen = new NTRUKeyGenerator(mpar);
IAsymmetricKeyPair akp = mkgen.GenerateKeyPair();
byte[] enc;
using (NTRUEncrypt mpe = new NTRUEncrypt(mpar))
{
mpe.Initialize(akp.PublicKey);
byte[] data = new byte[mpe.MaxPlainText];
enc = mpe.Encrypt(data);
mpe.Initialize(akp);
byte[] dec = mpe.Decrypt(enc);
if (!Compare.AreEqual(dec, data))
throw new Exception("Encryption test: decryption failure!");
}
}
private void Encode(NTRUParameters param)
{
NTRUKeyPair kp;
using (NTRUKeyGenerator kg = new NTRUKeyGenerator(param, false))
kp = (NTRUKeyPair)kg.GenerateKeyPair();
// encode to byte[] and reconstruct
byte[] enc = kp.ToBytes();
NTRUKeyPair kp2 = new NTRUKeyPair(enc);
if (!Compare.Equals(kp, kp2))
throw new Exception("NtruKeyPair encoding test failed!");
// encode to OutputStream and reconstruct
MemoryStream bos = new MemoryStream();
kp.WriteTo(bos);
MemoryStream bis = new MemoryStream(bos.ToArray());
NTRUKeyPair kp3 = new NTRUKeyPair(bis);
if (!Compare.Equals(kp, kp3))
throw new Exception("NtruKeyPair encoding test failed!");
}
