private byte[] OtaGenChunkHash(byte[] buf, int offset, int len)
{
byte[] hash = new byte[20];
OtaUpdateKeyBuffer();
Sodium.ss_sha1_hmac_ex(_otaChunkKeyBuffer, (uint)_otaChunkKeyBuffer.Length,
buf, offset, (uint)len, hash);
return(hash);
}
protected byte[] genHash(byte[] buf, int offset, int len)
{
byte[] hash = new byte[20];
updateKeyBuffer();
Sodium.ss_sha1_hmac_ex(_keyBuffer, (uint)_keyBuffer.Length,
buf, offset, (uint)len, hash);
return(hash);
}
private byte[] OtaGenHash(byte[] msg, int msg_len)
{
byte[] auth = new byte[ONETIMEAUTH_BYTES];
byte[] hash = new byte[20];
byte[] auth_key = new byte[MAX_IV_LENGTH + MAX_KEY_LENGTH];
Buffer.BlockCopy(_encryptIV, 0, auth_key, 0, ivLen);
Buffer.BlockCopy(_key, 0, auth_key, ivLen, keyLen);
Sodium.ss_sha1_hmac_ex(auth_key, (uint)(ivLen + keyLen),
msg, 0, (uint)msg_len, hash);
Buffer.BlockCopy(hash, 0, auth, 0, ONETIMEAUTH_BYTES);
return(auth);
}