// 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);
}