public static byte[] Create(byte[] Message, byte[] Nonce, byte[] SecretKey, byte[] PublicKey)
{
if (SecretKey == null || SecretKey.Length != GetSecretKeyBytesLength())
{
throw new ArgumentException("Error: Secret key must be " + GetSecretKeyBytesLength() + " bytes in length");
}
if (PublicKey == null || PublicKey.Length != GetPublicKeyBytesLength())
{
throw new ArgumentException("Error: Public key must be " + GetPublicKeyBytesLength() + " bytes in length");
}
if (Nonce == null || Nonce.Length != GetNonceBytesLength())
{
throw new ArgumentException("Error: Nonce must be " + GetNonceBytesLength() + " bytes in length");
}
byte[] CipherText = new byte[Message.Length + GetMACBytesLength()];
int ret = SodiumPublicKeyBoxLibrary.crypto_box_easy(CipherText, Message, Message.Length, Nonce, PublicKey, SecretKey);
GCHandle MyGeneralGCHandle = new GCHandle();
MyGeneralGCHandle = GCHandle.Alloc(SecretKey, GCHandleType.Pinned);
SodiumSecureMemory.MemZero(MyGeneralGCHandle.AddrOfPinnedObject(), SecretKey.Length);
MyGeneralGCHandle.Free();
MyGeneralGCHandle = GCHandle.Alloc(PublicKey, GCHandleType.Pinned);
SodiumSecureMemory.MemZero(MyGeneralGCHandle.AddrOfPinnedObject(), PublicKey.Length);
MyGeneralGCHandle.Free();
if (ret != 0)
{
throw new CryptographicException("Failed to create PublicKeyBox");
}
return(CipherText);
}
public static byte[] Open(byte[] CipherText, byte[] Nonce, byte[] SecretKey, byte[] PublicKey)
{
if (SecretKey == null || SecretKey.Length != GetSecretKeyBytesLength())
{
throw new ArgumentException("Error: Secret key must be " + GetSecretKeyBytesLength() + " bytes in length");
}
if (PublicKey == null || PublicKey.Length != GetPublicKeyBytesLength())
{
throw new ArgumentException("Error: Public key must be " + GetPublicKeyBytesLength() + " bytes in length");
}
if (Nonce == null || Nonce.Length != GetNonceBytesLength())
{
throw new ArgumentException("Error: Nonce must be " + GetNonceBytesLength() + " bytes in length");
}
//check to see if there are MAC_BYTES of leading nulls, if so, trim.
//this is required due to an error in older versions.
if (CipherText[0] == 0)
{
//check to see if trim is needed
var trim = true;
for (var i = 0; i < GetMACBytesLength() - 1; i++)
{
if (CipherText[i] != 0)
{
trim = false;
break;
}
}
//if the leading MAC_BYTES are null, trim it off before going on.
if (trim)
{
var temp = new Byte[CipherText.Length - GetMACBytesLength()];
Array.Copy(CipherText, GetMACBytesLength(), temp, 0, CipherText.Length - GetMACBytesLength());
CipherText = temp;
}
}
Byte[] Message = new Byte[CipherText.Length - GetMACBytesLength()];
int ret = SodiumPublicKeyBoxLibrary.crypto_box_open_easy(Message, CipherText, CipherText.Length, Nonce, PublicKey, SecretKey);
if (ret != 0)
{
throw new CryptographicException("Failed to open PublicKeyBox");
}
GCHandle MyGeneralGCHandle = new GCHandle();
MyGeneralGCHandle = GCHandle.Alloc(SecretKey, GCHandleType.Pinned);
SodiumSecureMemory.MemZero(MyGeneralGCHandle.AddrOfPinnedObject(), SecretKey.Length);
MyGeneralGCHandle.Free();
MyGeneralGCHandle = GCHandle.Alloc(PublicKey, GCHandleType.Pinned);
SodiumSecureMemory.MemZero(MyGeneralGCHandle.AddrOfPinnedObject(), PublicKey.Length);
MyGeneralGCHandle.Free();
return(Message);
}