ecdh.setPublicKey(publicKey[, encoding])

• publicKey <string> | <ArrayBuffer> | <Buffer> | <TypedArray> | <DataView>

• encoding <string> publicKey 字符串的 字符编码。

  ¥encoding <string> The encoding of the publicKey string.

设置 EC Diffie-Hellman 公钥。如果提供了 encoding，则 publicKey 应该是一个字符串；否则应为 Buffer、TypedArray 或 DataView。

¥Sets the EC Diffie-Hellman public key. If encoding is provided publicKey is expected to be a string; otherwise a Buffer, TypedArray, or DataView is expected.

通常没有理由调用这个方法，因为 ECDH 只需要一个私钥和对方的公钥来计算共享秘密。通常会调用 ecdh.generateKeys() 或 ecdh.setPrivateKey()。ecdh.setPrivateKey() 方法尝试生成与正在设置的私钥相关联的公共点/密钥。

¥There is not normally a reason to call this method because ECDH only requires a private key and the other party's public key to compute the shared secret. Typically either ecdh.generateKeys() or ecdh.setPrivateKey() will be called. The ecdh.setPrivateKey() method attempts to generate the public point/key associated with the private key being set.

示例（获取共享密钥）：

¥Example (obtaining a shared secret):

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);拷贝