public byte[] VerifyAndDecryptMessage(byte[] encryptedMessage, byte[] nonce, PublicKeyCryptoKeyPair key, PublicKeyCryptoPublicKey senderPublicKey)
{
// verify arguments
if (nonce == null)
{
throw new ArgumentNullException("nonce");
}
if (nonce.Length != NonceSize)
{
throw new ArgumentOutOfRangeException("nonce", string.Format("Nonce must be {0} bytes long", NonceSize));
}
// decrypt
var paddedMessage = new byte[encryptedMessage.Length];
var result = PlatformInvoke64.crypto_box_open(paddedMessage, encryptedMessage, encryptedMessage.Length, nonce,
senderPublicKey.PlainBytes, key.SecretKeyBytes);
if (result != 0)
{
throw new CryptographicException("Failed");
}
var message = new byte[paddedMessage.Length - _zeroBytes];
Buffer.BlockCopy(paddedMessage, (int)_zeroBytes, message, 0, message.Length);
return(message);
}
public byte[] EncryptMessage(byte[] message, byte[] nonce, PublicKeyCryptoKeyPair key, PublicKeyCryptoPublicKey recipientPublicKey)
{
// verify arguments
if (nonce == null)
{
throw new ArgumentNullException("nonce");
}
if (nonce.Length != NonceSize)
{
throw new ArgumentOutOfRangeException("nonce", string.Format("Nonce must be {0} bytes long", NonceSize));
}
// pad the message (prepend zero bytes)
var paddedMessage = new byte[_zeroBytes + message.Length];
Buffer.BlockCopy(message, 0, paddedMessage, (int)_zeroBytes, message.Length);
// encrypt
var encryptedMessage = new byte[paddedMessage.Length];
var result = PlatformInvoke64.crypto_box(encryptedMessage, paddedMessage, paddedMessage.Length, nonce, recipientPublicKey.PlainBytes,
key.SecretKeyBytes);
if (result != 0)
{
throw new CryptographicException("Failed");
}
return(encryptedMessage);
}
public IAuthenticatedPublicKeyCryptoContext CreateCrypterInstance(PublicKeyCryptoKeyPair key, PublicKeyCryptoPublicKey publicKey)
{
// compute the shared secret
var sharedSecret = new byte[_beforeNmBytes];
var result = PlatformInvoke64.crypto_box_beforenm(sharedSecret, publicKey.PlainBytes, key.SecretKeyBytes);
if (result != 0) throw new CryptographicException("Failed");
return new AuthenticatedPublicKeyCryptoContext(this, sharedSecret);
}
public IAuthenticatedPublicKeyCryptoContext CreateCrypterInstance(PublicKeyCryptoKeyPair key, PublicKeyCryptoPublicKey publicKey)
{
// compute the shared secret
var sharedSecret = new byte[_beforeNmBytes];
var result = PlatformInvoke64.crypto_box_beforenm(sharedSecret, publicKey.PlainBytes, key.SecretKeyBytes);
if (result != 0)
{
throw new CryptographicException("Failed");
}
return(new AuthenticatedPublicKeyCryptoContext(this, sharedSecret));
}
public byte[] VerifyAndDecryptMessage(byte[] encryptedMessage, byte[] nonce, PublicKeyCryptoKeyPair key, PublicKeyCryptoPublicKey senderPublicKey)
{
// verify arguments
if (nonce == null) throw new ArgumentNullException("nonce");
if (nonce.Length != NonceSize)
throw new ArgumentOutOfRangeException("nonce", string.Format("Nonce must be {0} bytes long", NonceSize));
// decrypt
var paddedMessage = new byte[encryptedMessage.Length];
var result = PlatformInvoke64.crypto_box_open(paddedMessage, encryptedMessage, encryptedMessage.Length, nonce,
senderPublicKey.PlainBytes, key.SecretKeyBytes);
if (result != 0) throw new CryptographicException("Failed");
var message = new byte[paddedMessage.Length - _zeroBytes];
Buffer.BlockCopy(paddedMessage, (int)_zeroBytes, message, 0, message.Length);
return message;
}
public byte[] EncryptMessage(byte[] message, byte[] nonce, PublicKeyCryptoKeyPair key, PublicKeyCryptoPublicKey recipientPublicKey)
{
// verify arguments
if (nonce == null) throw new ArgumentNullException("nonce");
if (nonce.Length != NonceSize)
throw new ArgumentOutOfRangeException("nonce", string.Format("Nonce must be {0} bytes long", NonceSize));
// pad the message (prepend zero bytes)
var paddedMessage = new byte[_zeroBytes + message.Length];
Buffer.BlockCopy(message, 0, paddedMessage, (int)_zeroBytes, message.Length);
// encrypt
var encryptedMessage = new byte[paddedMessage.Length];
var result = PlatformInvoke64.crypto_box(encryptedMessage, paddedMessage, paddedMessage.Length, nonce, recipientPublicKey.PlainBytes,
key.SecretKeyBytes);
if (result != 0) throw new CryptographicException("Failed");
return encryptedMessage;
}
