/// <summary>
/// Decrypt by Rfc 2898 DeriveBytes - PBKDF2
/// </summary>
/// <param name="value"></param>
/// <param name="key"> </param>
/// <returns></returns>
public static string Decrypt(string value, string key)
{
byte[] cipherBytes = Safe64Encoding.DecodeBytes(value);
using (var encrypt = Aes.Create())
{
var pdb = new Rfc2898DeriveBytes(key,
new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encrypt.Key = pdb.GetBytes(32);
encrypt.IV = pdb.GetBytes(16);
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, encrypt.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
}
value = Encoding.ASCII.GetString(ms.ToArray());
}
}
return(value);
}
public void TestSafe64StreamRead()
{
string encoded = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
byte[] data = Safe64Encoding.DecodeBytes(encoded);
byte[] test;
using (Stream io = new Safe64Stream(new MemoryStream(Encoding.ASCII.GetBytes(encoded)), CryptoStreamMode.Read))
test = IOStream.Read(io, data.Length);
Assert.AreEqual(data, test);
}
public void TestSafe64EncodingAllChars()
{
//char count must by multiple of 4 for the compare to work
string encoded = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
byte[] data = Safe64Encoding.DecodeBytes(encoded);
Assert.AreEqual(encoded, Safe64Encoding.EncodeBytes(data));
data = AsciiEncoder.DecodeBytes(encoded);
Assert.AreEqual(encoded, AsciiEncoder.EncodeBytes(data));
data = AsciiEncoder.DecodeBytes(Encoding.ASCII.GetBytes(encoded));
Assert.AreEqual(encoded, AsciiEncoder.EncodeBytes(data));
}
public void TestSafe64EncodingLargeArray()
{
Random rand = new Random();
byte[] data = new byte[0x400000];
rand.NextBytes(data);
string testAsc = Safe64Encoding.EncodeBytes(data);
Assert.AreEqual(0, BinaryComparer.Compare(data, Safe64Encoding.DecodeBytes(testAsc)));
testAsc = AsciiEncoder.EncodeBytes(data);
Assert.AreEqual(0, BinaryComparer.Compare(data, AsciiEncoder.DecodeBytes(testAsc)));
}
void TestEncoderAgainstBase64(int repeat, int size)
{
Random rand = new Random();
byte[] data = new byte[size];
while (repeat-- > 0)
{
rand.NextBytes(data);
string testB64 = Convert.ToBase64String(data);
string testAsc = Safe64Encoding.EncodeBytes(data);
Assert.AreEqual(testB64.Replace('+', '-').Replace('/', '_').Replace("=", ""), testAsc);
Assert.AreEqual(0, BinaryComparer.Compare(data, Safe64Encoding.DecodeBytes(testAsc)));
Assert.AreEqual(0, BinaryComparer.Compare(data, AsciiEncoder.DecodeBytes(testAsc)));
}
}
public void TestBadInputCharacter()
{
byte[] trash = new byte[] { (byte)'a', (byte)'b', (byte)'c', (byte)'\0' };
Safe64Encoding.DecodeBytes(trash);
Assert.Fail();
}