// Construct a Skip32 Cipher based on the supplied key.
public Skip32Cipher(string key, Skip32CipherKeyFormat format)
{
if (String.IsNullOrEmpty(key))
throw new ArgumentNullException("key", "Key must not be null or empty");
byte[] bytes;
if (format == Skip32CipherKeyFormat.Base64)
{
bytes = Convert.FromBase64String(key);
}
else if (format == Skip32CipherKeyFormat.HexString)
{
if (key.Length != KeySize * 2)
throw new ArgumentOutOfRangeException("key", String.Format("Hexadecimal key strings must be {0} characters", KeySize * 2));
bytes = new byte[KeySize];
for (int i = 0; i < KeySize; ++i)
{
string sub = key.Substring(i * 2, 2);
int byteValue = Int32.Parse(sub, System.Globalization.NumberStyles.HexNumber);
System.Diagnostics.Debug.Assert(byteValue >= 0);
System.Diagnostics.Debug.Assert(byteValue <= 255);
bytes[i] = Convert.ToByte(byteValue);
}
}
else
throw new ArgumentOutOfRangeException("format", "Invalid key format: " + format);
if (bytes.Length != KeySize)
throw new ArgumentOutOfRangeException("key", String.Format("Key must resolve to {0} bytes", KeySize));
// Save for later
_key = bytes;
}
// Construct a Skip32 Cipher based on the supplied key.
public Skip32Cipher(string key, Skip32CipherKeyFormat format)
{
if (String.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key", "Key must not be null or empty");
}
byte[] bytes;
if (format == Skip32CipherKeyFormat.Base64)
{
bytes = Convert.FromBase64String(key);
}
else if (format == Skip32CipherKeyFormat.HexString)
{
if (key.Length != KeySize * 2)
{
throw new ArgumentOutOfRangeException("key", String.Format("Hexadecimal key strings must be {0} characters", KeySize * 2));
}
bytes = new byte[KeySize];
for (int i = 0; i < KeySize; ++i)
{
string sub = key.Substring(i * 2, 2);
int byteValue = Int32.Parse(sub, System.Globalization.NumberStyles.HexNumber);
System.Diagnostics.Debug.Assert(byteValue >= 0);
System.Diagnostics.Debug.Assert(byteValue <= 255);
bytes[i] = Convert.ToByte(byteValue);
}
}
else
{
throw new ArgumentOutOfRangeException("format", "Invalid key format: " + format);
}
if (bytes.Length != KeySize)
{
throw new ArgumentOutOfRangeException("key", String.Format("Key must resolve to {0} bytes", KeySize));
}
// Save for later
_key = bytes;
}
