internal static byte[] Encrypt(byte[] data, byte[] pubkey)
{
// pyelliptic.ECC(curve='secp256k1').encrypt(msg,hexToPubkey(hexPubkey))
// curve, pubkey_x, pubkey_y, i = ECC._decode_pubkey(pubkey)
UInt16 curve = ECC.Secp256K1;
string ciphername = "aes-256-cbc";
var ephem = new ECC(null, null, null, null, null, curve);
byte[] pubkey_x = new byte[32];
byte[] pubkey_y = new byte[32];
Buffer.BlockCopy(pubkey, 1, pubkey_x, 0, 32);
Buffer.BlockCopy(pubkey, 33, pubkey_y, 0, 32);
//key = sha512(ephem.raw_get_ecdh_key(pubkey_x, pubkey_y)).digest()
byte[] key;
using (var sha512 = new SHA512Managed())
key = sha512.ComputeHash(ephem.raw_get_ecdh_key(pubkey_x, pubkey_y));
byte[] key_e = new byte[32];
byte[] key_m = new byte[32];
Buffer.BlockCopy(key, 0, key_e, 0, 32);
Buffer.BlockCopy(key, 32, key_m, 0, 32);
byte[] pubkey4Write = ephem.get_pubkey();
byte[] iv = new byte[get_blocksize("aes-256-cbc")];
using (var rnd = new RNGCryptoServiceProvider())
rnd.GetBytes(iv);
var ctx = new Cipher(key_e, iv, true, ciphername);
var ciphertext = ctx.Ciphering(data);
var mac = new HMACSHA256(key_m).ComputeHash(ciphertext);
byte[] result = new byte[iv.Length + pubkey4Write.Length + ciphertext.Length + mac.Length];
Buffer.BlockCopy(iv, 0, result, 0, iv.Length);
Buffer.BlockCopy(pubkey4Write, 0, result, iv.Length, pubkey4Write.Length);
Buffer.BlockCopy(ciphertext, 0, result, iv.Length + pubkey4Write.Length, ciphertext.Length);
Buffer.BlockCopy(mac, 0, result, iv.Length + pubkey4Write.Length + ciphertext.Length, mac.Length);
//Debug.WriteLine("iv=" + iv.ToHex());
//Debug.WriteLine("pubkey4Write=" + pubkey4Write.ToHex());
return(result);
}
internal static byte[] Encrypt(byte[] data, byte[] pubkey)
{
// pyelliptic.ECC(curve='secp256k1').encrypt(msg,hexToPubkey(hexPubkey))
// curve, pubkey_x, pubkey_y, i = ECC._decode_pubkey(pubkey)
UInt16 curve = ECC.Secp256K1;
string ciphername = "aes-256-cbc";
var ephem = new ECC(null, null, null, null, null, curve);
byte[] pubkey_x = new byte[32];
byte[] pubkey_y = new byte[32];
Buffer.BlockCopy(pubkey, 1, pubkey_x, 0, 32);
Buffer.BlockCopy(pubkey, 33, pubkey_y, 0, 32);
//key = sha512(ephem.raw_get_ecdh_key(pubkey_x, pubkey_y)).digest()
byte[] key;
using (var sha512 = new SHA512Managed())
key = sha512.ComputeHash(ephem.raw_get_ecdh_key(pubkey_x, pubkey_y));
byte[] key_e = new byte[32];
byte[] key_m = new byte[32];
Buffer.BlockCopy(key, 0, key_e, 0, 32);
Buffer.BlockCopy(key, 32, key_m, 0, 32);
byte[] pubkey4Write = ephem.get_pubkey();
byte[] iv = new byte[get_blocksize("aes-256-cbc")];
using (var rnd = new RNGCryptoServiceProvider())
rnd.GetBytes(iv);
var ctx = new Cipher(key_e, iv, true, ciphername);
var ciphertext = ctx.Ciphering(data);
var mac = new HMACSHA256(key_m).ComputeHash(ciphertext);
byte[] result = new byte[iv.Length + pubkey4Write.Length + ciphertext.Length + mac.Length];
Buffer.BlockCopy(iv, 0, result, 0, iv.Length);
Buffer.BlockCopy(pubkey4Write, 0, result, iv.Length, pubkey4Write.Length);
Buffer.BlockCopy(ciphertext, 0, result, iv.Length + pubkey4Write.Length, ciphertext.Length);
Buffer.BlockCopy(mac, 0, result, iv.Length + pubkey4Write.Length + ciphertext.Length, mac.Length);
//Debug.WriteLine("iv=" + iv.ToHex());
//Debug.WriteLine("pubkey4Write=" + pubkey4Write.ToHex());
return result;
}