public static byte[] EncryptSalsa20(byte[] input, string key)
{
byte[] initKey = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(key));
byte[] initVec = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(key).Reverse().ToArray());
initKey = initKey.Crop(32);
initVec = initVec.Crop(8);
var enc = new Salsa20().CreateEncryptor(initKey, initVec);
byte[] output = enc.TransformFinalBlock(input, 0, input.Length);
return output;
}
public void IV()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
Assert.Throws<ArgumentNullException>(() => salsa20.IV = null);
Assert.Throws<CryptographicException>(() => salsa20.IV = new byte[9]);
byte[] iv = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
salsa20.IV = iv;
CollectionAssert.AreEqual(iv, salsa20.IV);
}
}
public void Rounds()
{
using (Salsa20 salsa20 = new Salsa20())
{
Assert.AreEqual(20, salsa20.Rounds);
salsa20.Rounds = 12;
Assert.AreEqual(12, salsa20.Rounds);
salsa20.Rounds = 8;
Assert.AreEqual(8, salsa20.Rounds);
Assert.Throws<ArgumentOutOfRangeException>(() => salsa20.Rounds = 16);
}
}
public void BlockSize()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
Assert.AreEqual(512, salsa20.BlockSize);
KeySizes[] sizes = salsa20.LegalBlockSizes;
Assert.AreEqual(1, sizes.Length);
Assert.AreEqual(512, sizes[0].MinSize);
Assert.AreEqual(512, sizes[0].MaxSize);
Assert.AreEqual(0, sizes[0].SkipSize);
Assert.Throws<CryptographicException>(() => salsa20.BlockSize = 128);
}
}
public void Key()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
KeySizes[] sizes = salsa20.LegalKeySizes;
Assert.AreEqual(1, sizes.Length);
Assert.AreEqual(128, sizes[0].MinSize);
Assert.AreEqual(256, sizes[0].MaxSize);
Assert.AreEqual(128, sizes[0].SkipSize);
Assert.Throws<ArgumentNullException>(() => salsa20.Key = null);
Assert.Throws<CryptographicException>(() => salsa20.Key = new byte[8]);
byte[] key16 = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
salsa20.Key = key16;
CollectionAssert.AreEqual(key16, salsa20.Key);
byte[] key32 = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f };
salsa20.Key = key32;
CollectionAssert.AreEqual(key32, salsa20.Key);
}
}
public void CreateDecryptorInvalid()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
Assert.Throws<ArgumentNullException>(() => salsa20.CreateDecryptor(null, new byte[8]));
Assert.Throws<ArgumentNullException>(() => salsa20.CreateDecryptor(new byte[16], null));
Assert.Throws<CryptographicException>(() => salsa20.CreateDecryptor(new byte[15], new byte[8]));
Assert.Throws<CryptographicException>(() => salsa20.CreateDecryptor(new byte[16], new byte[7]));
}
}
public void EcryptTestVector131072(string strComment, int rounds, string key, string iv, string strOutput0_63, string strOutput65472_65535, string strOutput65536_65599, string strOutput131008_131071)
{
byte[] output;
// use the Salsa20 transform directly
using (SymmetricAlgorithm salsa20 = new Salsa20() { Rounds = rounds })
using (ICryptoTransform encrypt = salsa20.CreateEncryptor(ToBytes(key), ToBytes(iv)))
{
// input is all zeroes
byte[] input = new byte[131072];
output = encrypt.TransformFinalBlock(input, 0, input.Length);
}
CollectionAssert.AreEqual(ToBytes(strOutput0_63), output.Skip(0).Take(64).ToList());
CollectionAssert.AreEqual(ToBytes(strOutput65472_65535), output.Skip(65472).Take(64).ToList());
CollectionAssert.AreEqual(ToBytes(strOutput65536_65599), output.Skip(65536).Take(64).ToList());
CollectionAssert.AreEqual(ToBytes(strOutput131008_131071), output.Skip(131008).Take(64).ToList());
}
public void EcryptTestVector512(string strComment, int rounds, string key, string iv, string strOutput0_63, string strOutput192_255, string strOutput256_319, string strOutput448_511)
{
const int c_nSize = 512;
byte[] output = new byte[c_nSize];
// encrypt by using CryptoStream
using (SymmetricAlgorithm salsa20 = new Salsa20() { Rounds = rounds })
using (ICryptoTransform encrypt = salsa20.CreateEncryptor(ToBytes(key), ToBytes(iv)))
using (MemoryStream streamInput = new MemoryStream(new byte[c_nSize], false))
using (CryptoStream streamEncrypted = new CryptoStream(streamInput, encrypt, CryptoStreamMode.Read))
{
streamEncrypted.Read(output, 0, output.Length);
}
CollectionAssert.AreEqual(ToBytes(strOutput0_63), output.Skip(0).Take(64).ToList());
CollectionAssert.AreEqual(ToBytes(strOutput192_255), output.Skip(192).Take(64).ToList());
CollectionAssert.AreEqual(ToBytes(strOutput256_319), output.Skip(256).Take(64).ToList());
CollectionAssert.AreEqual(ToBytes(strOutput448_511), output.Skip(448).Take(64).ToList());
}
public void EncryptDecrypt()
{
// generate data to encrypt
byte[] input;
using (MemoryStream stream = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(stream))
{
for (short value = -1024; value <= 1023; value++)
writer.Write(value);
writer.Flush();
input = stream.ToArray();
}
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
byte[] encrypted = new byte[input.Length];
using (ICryptoTransform encrypt = salsa20.CreateEncryptor())
encrypt.TransformBlock(input, 0, input.Length, encrypted, 0);
byte[] decrypted = new byte[input.Length];
using (ICryptoTransform decrypt = salsa20.CreateDecryptor())
decrypt.TransformBlock(encrypted, 0, encrypted.Length, decrypted, 0);
CollectionAssert.AreEqual(input, decrypted);
}
}
public void Dispose()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
using (ICryptoTransform transform = salsa20.CreateEncryptor(new byte[16], new byte[8]))
{
transform.Dispose();
transform.Dispose();
Assert.Throws<ObjectDisposedException>(() => transform.TransformBlock(new byte[1], 0, 1, new byte[1], 0));
Assert.Throws<ObjectDisposedException>(() => transform.TransformFinalBlock(new byte[1], 0, 1));
((IDisposable) salsa20).Dispose();
((IDisposable) salsa20).Dispose();
}
}
public void TransformFinalBlock()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
using (ICryptoTransform transform = salsa20.CreateEncryptor(new byte[16], new byte[8]))
{
byte[] aby0 = new byte[0];
byte[] aby1 = new byte[1];
Assert.Throws<ArgumentNullException>(() => transform.TransformFinalBlock(null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => transform.TransformFinalBlock(aby0, -1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => transform.TransformFinalBlock(aby0, 1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => transform.TransformFinalBlock(aby1, 0, -1));
Assert.Throws<ArgumentOutOfRangeException>(() => transform.TransformFinalBlock(aby1, 0, 2));
Assert.Throws<ArgumentOutOfRangeException>(() => transform.TransformFinalBlock(aby1, 1, 1));
}
}
public void CryptoTransform()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
using (ICryptoTransform transform = salsa20.CreateEncryptor(new byte[16], new byte[8]))
{
Assert.AreEqual(salsa20.BlockSize / 8, transform.InputBlockSize);
Assert.AreEqual(salsa20.BlockSize / 8, transform.OutputBlockSize);
Assert.IsFalse(transform.CanReuseTransform);
Assert.IsTrue(transform.CanTransformMultipleBlocks);
}
}
