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42 lines
1.8 KiB
42 lines
1.8 KiB
2 years ago
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# Generate Address
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### Instructions
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Create a function `generateAddress()` that generates a pair of cryptographic keys using the elliptic curve `secp256k1`. The return value is an object with members:
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- `privateKey`, a private key as a string (`pkcs8/pem` format)
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- `publicKey`, the corresponding public key as a string (`spki/pem`)
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- `address`, an address to identify this account. The address is the hash `sha256` of the publicKey (in format `spki/der`) prepended with '01'
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### Usage
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```js
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console.log(generateAddress())
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// expected result :
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{
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privateKey: '-----BEGIN PRIVATE KEY-----\n' +
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'MIGEAgEAMBAGByqGSM49AgEGBSuBBAAKBG0wawIBAQQg6wEoiAc7tEeOfh1HPVMw\n' +
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'z/eNG/D30JziVWjq8bW35MChRANCAAQP0WsGc3VmBsXO6Iz+LKxPPWNRb2DqUJKY\n' +
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'8Qh7qVvB4rExjUR0DhgUJrTC9tCPy3aiYGbXYLzuXTuOBcPbUiJq\n' +
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'-----END PRIVATE KEY-----\n',
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publicKey: '-----BEGIN PUBLIC KEY-----\n' +
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'MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAED9FrBnN1ZgbFzuiM/iysTz1jUW9g6lCS\n' +
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'mPEIe6lbweKxMY1EdA4YFCa0wvbQj8t2omBm12C87l07jgXD21Iiag==\n' +
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'-----END PUBLIC KEY-----\n',
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address: '01598fbb0e68eaa369d361f7b59157d80a91b2b78de74bc2ff71f6a44b272af368'
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}
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```
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### Relevance
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- The `secp256k1` curve is used several blockchains to generate keys.
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- An user account is identified using an `address`. The address is computed from the public key using hash functions, splits and concatenations.
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- In Bitcoin `hash160` is used in the process and the address starts with '1', '3' or 'bc1'.
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- In Ethereum `keccak-256` is used and addresses are appended with 'Ox' that denotes an hexadecimal number.
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### Notions
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- [Node.js _crypto_ generateKeyPairSync](https://nodejs.org/docs/latest-v14.x/api/crypto.html#crypto_crypto_generatekeypairsync_type_options)
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- [Bitcoin invoice address](https://en.bitcoin.it/wiki/Invoice_address)
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