ECKeyManager Native Module

This native module exposes java functions and react methods that deal with the generation and management of ECDSA keys. To generate Ethereum keys, the native module uses Web3j and BouncyCastle libraries. The EC key pair is generated using the secp256k1 EC.

compressPublicKey

This react method can be used to compress the EC Public key.

Input parameters

• pubKey: EC Public Key (in Big Integer format) to be compressed.

Return parameters

Compressed EC public key in String format.

deriveAddress

This react method can be used to derive ETH address from a given public key.

Input parameters

• publicKey: EC Public Key (in Big Integer format).

Return parameters

ETH address in String format

generateKeystoreJSON

This react method can be used to generate a keystore JSON file for a given EC Key pair.

Input parameters

• walletPassword: String password to protect the kyestore file.
• storagePath: Directory location (in String format) to store the keystore file.
• ecKeyPair: EC Key pair to generate keystore file for.

Return parameters

Filename (in String format) of the newly generated Keystore file.

decryptCredentials

This react method can be used to decrypt a keystore wallet and derive the credentials.

Input parameters

• keystorePath: File path of the keystore JSON, to load credentials from.
• walletPassword: Password (in String format) of the keystore JSON file.

Return parameters

Returns the EC key pair in the org.web3j.crypto.Credentials format.

generateBIP39Mnemonic

This method generates a BIP39 seed phrase (mnemonic) which can be used to derive EC key pair.

Input parameters

Not required.

Return parameters

Mnemonic (in String format).

generateECKeyPairFromMnemonic

This method is used to generate EC key pair from the mnemonic (generated using the generateBIP39Mnemonic function).

Input parameters

• mnemonic: Seed phrase (in String format).
• password: Password (in String format) to create EC key pair.

Return parameters

EC key pair (in the format org.web3j.crypto.ECKeyPair).

convertECKeyPairToKeyPair

This method is used to convert the format of keypair from Bouncycastle's ECKeyPair to Android's KeyPair.

Input parameters

• ecKeyPair: EC key pair (in the format supported by bouncycastle).

Return parameters

KeyPair, in the format supported by Android keystore.

generateAndSaveWallet

This React method can be used to generate a password protected keystore wallet from a given seed phrase.

Input parameters

• mnemonic: Seed phrase (in String format).
• password: Password (in String format) to encrypt the file.
• destinationDirectory: Directory path (in String format) to save the keystore JSON file in.

Return parameters

Filename (in String format) of the newly created keystore JSON file.

loadCredentialsFromFile

This react method can be used to load EC key pairs from an externally stored keystore JSON file, provided the file path in user's mobile device.

Input parameters

• password: Password (in String format) to decrypt the file.
• filePath: File path (in String format) of the keystore JSON file.

Return parameters

Nothing.