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Crypto Design Doc

Similar to Bitcoin and Ethereum, Nebulas also adopts elliptic curve algorithm as its basic encryption algorithm for Nebulas transactions. Users' private key will be encrypted with user's passphrases and stored in keystore.

Hash

Support generic hash functions, like sha256, sha3256 and ripemd160 etc.

Keystore

Nebulas Keystore are designed to manage user's keys.

Key

The Key interface is designed to support various keys, including symmetric keys and asymmetric keys.

Provider

Keystore provide different methods to save keys, such as memory_provider and persistence_provider. Before saved, key has been encrypted in keystore.

  • memory provider: This type of provider keep keys in memory. After the key has been encrypted with the passphrase when user setkey or load, it is cached in memory provider.

  • persistence provider: This type of provider serialize the encrypted key to the file. The file is compatible with the ethereum's keystore file,users can back up the address with its privatekey in it.

Signature

The Signature interface is used to provide applications the functionality of a digital signature algorithm. A Signature object can be used to generate and verify digital signatures.

There are two phases to use a Signature object for either signing data :

  • Initialization: with a private key, which initializes the signature for signing (see initSign() in the source code of go-nebulas).

  • Signing on all input bytes.

A Signature object can recover the public key with a signatrue and the plain text was singed on(see function RecoverSignerFromSignature in go-nebulas). So just comparing the from address and the address derived from the public key can verfiy a transaction

Similar as Android Keystore, TPM, TEE and hardware low level security protection will be supported as a provider later.