// Puts together the body of the post request for a OTP encrypted key,
// returns a string[] with the did, the signature, and the body of the
// post request.
public static string[] makePost(byte[] encryptedKey)
{
byte[] vk = new byte[32];
byte[] sk = new byte[64];
string dateTime;
string body;
string did;
string signature;
string keyString = Convert.ToBase64String(encryptedKey);
int signed_bytes = LibSodiumManager.nacl_crypto_sign_BYTES();
LibSodiumManager.nacl_crypto_sign_keypair(vk, sk);
did = makeDid(vk);
dateTime = DateTime.Now.ToString("yyyy-MM-ddTHH\\:mm\\:ss.ffffffzzz");
body = "{\"id\":\"" + did + "\",\"blob\":\"" + keyString + "\",\"changed\":\"" + dateTime + "\"}";
byte[] bodyByte = new byte[body.Length];
bodyByte = Encoding.UTF8.GetBytes(body);
byte[] sm = new byte[signed_bytes + bodyByte.Length];
signature = signResource(sm, bodyByte, (ulong)bodyByte.Length, sk, vk);
signature = "signer=\"" + signature + "\"";
string[] data = new string[3];
data[0] = did;
data[1] = signature;
data[2] = body;
return(data);
}
// Create signature to use in the header of POST and PUT requests to didery
public static string signResource(byte[] sm, byte[] m, ulong mlen, byte[] sk, byte[] vk)
{
LibSodiumManager.nacl_crypto_sign(sm, m, mlen, sk);
byte[] sig = new byte[LibSodiumManager.nacl_crypto_sign_BYTES()];
for (int i = 0; i < sig.Length; i++)
{
sig[i] = sm[i];
}
byte[] usm = new byte[m.Length];
int success = LibSodiumManager.nacl_crypto_sign_open(usm, sm, (ulong)sm.Length, vk);
if (success == 0)
{
Debug.Log("Signing successful");
}
else
{
Debug.Log("Signing unsuccessful: " + success);
}
string signature = Convert.ToBase64String(sig).Replace('+', '-').Replace('/', '_');
return(signature);
}
// Generates a random seed based on the size of the byte array argument passed in
public static byte[] randomSeedGenerator(byte[] seed)
{
for (int i = 0; i < seed.Length; i++)
{
seed[i] = (byte)LibSodiumManager.nacl_randombytes_random();
}
return(seed);
}
void Test()
{
Debug.Log("LibSodium Test: randombytes_buf_deterministic");
int size = 16;
byte[] buf = new byte[size];
byte[] seed = new byte[] {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
};
LibSodiumManager.nacl_randombytes_buf_deterministic(buf, size, seed);
Debug.Log("Buffer Size: " + buf.Length);
Debug.Log("Buffer: " + ByteArrayToString(buf));
}
// Generates the one-time pad from a seed
public static void OTPGenerator(byte[] otp, int size, byte[] seed)
{
LibSodiumManager.nacl_randombytes_buf_deterministic(otp, size, seed);
//Debug.Log("Seed length: " + seed.Length + " Seed string: " + ByteArrayToHex(seed));
//Debug.Log("OTP length: " + otp.Length + " OTP first bytes: " + otp[0] + " " + otp[1] + " " + otp[2] + " " + otp[3]);
}
