Node.js ECDH.setPublicKey(publicKey[, encoding])用法及代碼示例

ecdh.setPublicKey(publicKey[, encoding])

參數

• publicKey <string> | <ArrayBuffer> | <Buffer> | <TypedArray> | <DataView>
• encoding <string> publicKey 字符串的encoding。

設置 EC Diffie-Hellman 公鑰。如果提供了encoding，則publicKey 應該是一個字符串；否則會出現 Buffer 、 TypedArray 或 DataView 。

通常沒有理由調用此方法，因為ECDH 隻需要私鑰和對方的公鑰來計算共享 key 。通常將調用 ecdh.generateKeys() 或 ecdh.setPrivateKey() 。 ecdh.setPrivateKey() 方法嘗試生成與正在設置的私鑰關聯的公共點/ key 。

示例(獲取共享 key )：

const {
  createECDH,
  createHash
} = await import('node:crypto');

const alice = createECDH('secp256k1');
const bob = createECDH('secp256k1');

// This is a shortcut way of specifying one of Alice's previous private
// keys. It would be unwise to use such a predictable private key in a real
// application.
alice.setPrivateKey(
  createHash('sha256').update('alice', 'utf8').digest()
);

// Bob uses a newly generated cryptographically strong
// pseudorandom key pair
bob.generateKeys();

const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex');
const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');

// aliceSecret and bobSecret should be the same shared secret value
console.log(aliceSecret === bobSecret);const {
  createECDH,
  createHash,
} = require('node:crypto');

const alice = createECDH('secp256k1');
const bob = createECDH('secp256k1');

// This is a shortcut way of specifying one of Alice's previous private
// keys. It would be unwise to use such a predictable private key in a real
// application.
alice.setPrivateKey(
  createHash('sha256').update('alice', 'utf8').digest()
);

// Bob uses a newly generated cryptographically strong
// pseudorandom key pair
bob.generateKeys();

const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex');
const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');

// aliceSecret and bobSecret should be the same shared secret value
console.log(aliceSecret === bobSecret);