treasurechest/tests/Curve25519Test.cs

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using NUnit.Framework;
using chestcrypto;
using System;
using System.Text;
using Sodium;
namespace Curve25519Tests
{
public class Tests
{
[SetUp]
public void Setup()
{
}
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[Test]
public void TestCurve25519Decrypt()
{
var alice = PublicKeyBox.GenerateKeyPair();
var bob = PublicKeyBox.GenerateKeyPair();
string message = "Hello World";
byte[] message_bytes = UTF8Encoding.UTF8.GetBytes(message);
byte[] nonce = Sodium.PublicKeyBox.GenerateNonce();
byte[] encrypted =
Sodium.PublicKeyBox.Create(
message,
nonce,
alice.PrivateKey,
bob.PublicKey
);
byte[] both = new byte[nonce.Length + encrypted.Length];
Buffer.BlockCopy(nonce, 0, both, 0, nonce.Length);
Buffer.BlockCopy(encrypted, 0, both, nonce.Length, encrypted.Length);
byte[] decrypted = chestcrypto.Curve25519.decrypt(bob.PrivateKey, alice.PublicKey, both);
string decrypted_string = Encoding.UTF8.GetString(decrypted, 0, decrypted.Length);
if (! decrypted_string.Equals(message)){
Assert.Fail();
}
}
[Test]
public void TestCurve25519Encrypt()
{
var alice = PublicKeyBox.GenerateKeyPair();
var bob = PublicKeyBox.GenerateKeyPair();
string message = "Hello World";
byte[] message_bytes = UTF8Encoding.UTF8.GetBytes(message);
byte[] encrypted_with_nonce = chestcrypto.Curve25519.encrypt(alice.PrivateKey, bob.PublicKey, message_bytes);
byte[] used_nonce = new byte[24];
byte[] encrypted_without_nonce = new byte[encrypted_with_nonce.Length - 24];
int counter = 0;
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for (int i = 24; i < encrypted_with_nonce.Length; i++){
encrypted_without_nonce[counter] = encrypted_with_nonce[i];
counter += 1;
}
for (int i = 0; i < chestcrypto.Curve25519.NONCE_BYTE_AMOUNT; i++){
used_nonce[i] = encrypted_with_nonce[i];
}
for (int i = 0; i < chestcrypto.Curve25519.NONCE_BYTE_AMOUNT; i++){
if (used_nonce[i] != encrypted_with_nonce[i]){
Assert.Fail();
}
}
byte[] decrypted = PublicKeyBox.Open(encrypted_without_nonce, used_nonce, bob.PrivateKey, alice.PublicKey);
if (!Encoding.UTF8.GetString(decrypted, 0, decrypted.Length).Equals(message)){
Assert.Fail();
}
}
}
}