68 lines
2.9 KiB
Markdown
68 lines
2.9 KiB
Markdown
# ethereumjs-wallet
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A lightweight wallet implementation. At the moment it supports key creation and conversion between various formats.
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It is complemented by the following packages:
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- [ethereumjs-tx](https://github.com/ethereumjs/ethereumjs-tx) to sign transactions
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- [ethereumjs-icap](https://github.com/ethereumjs/ethereumjs-icap) to manipulate ICAP addresses
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- [store.js](https://github.com/marcuswestin/store.js) to use browser storage
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Motivations are:
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- be lightweight
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- work in a browser
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- use a single, maintained version of crypto library
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- support import/export between various wallet formats
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Features not supported:
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- signing transactions
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- managing storage (neither in node.js or the browser)
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## API
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Constructors:
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* `fromPrivateKey(input)` - create an instance based on a raw key
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* `fromV1(input, password)` - import a wallet (Version 1 of the Ethereum wallet format)
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* `fromV3(input, password)` - import a wallet (Version 3 of the Ethereum wallet format)
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* `fromEthSale(input, password)` - import an Ethereum Pre Sale wallet
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For the V1, V3 and EthSale formats the input is a JSON serialized string. All these formats require a password.
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Instance methods:
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* `getPrivateKey()` - return the private key
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* `getPublicKey()` - return the public key
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* `getAddress()` - return the address
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* `toV3(password, [options])` - return the wallet as a JSON string (Version 3 of the Ethereum wallet format)
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All of the above instance methods return a Buffer or JSON. Use the `String` suffixed versions for a string output, such as `getPrivateKeyString()`.
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### Remarks about `toV3`
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The `options` is an optional object hash, where all the serialization parameters can be fine tuned:
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- uuid - UUID. One is randomly generated.
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- salt - Random salt for the `kdf`. Size must match the requirements of the KDF (key derivation function). Random number generated via `crypto.getRandomBytes` if nothing is supplied.
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- iv - Initialization vector for the `cipher`. Size must match the requirements of the cipher. Random number generated via `crypto.getRandomBytes` if nothing is supplied.
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- kdf - The key derivation function, see below.
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- dklen - Derived key length. For certain `cipher` settings, this must match the block sizes of those.
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- cipher - The cipher to use. Names must match those of supported by `OpenSSL`, e.g. `aes-128-ctr` or `aes-128-cbc`.
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Depending on the `kdf` selected, the following options are available too.
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For `pbkdf2`:
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- `c` - Number of iterations. Defaults to 262144.
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- `prf` - The only supported (and default) value is `hmac-sha256`. So no point changing it.
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For `scrypt`:
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- `n` - Iteration count. Defaults to 262144.
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- `r` - Block size for the underlying hash. Defaults to 8.
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- `p` - Parallelization factor. Defaults to 1.
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The following settings are favoured by the Go Ethereum implementation and we default to the same:
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- `kdf`: `scrypt`
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- `dklen`: `32`
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- `n`: `262144`
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- `r`: `8`
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- `p`: `1`
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- `cipher`: `aes-128-ctr`
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