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app.js
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/**
* @description libsignal 实现加密流程
* @See https://www.cnblogs.com/over140/p/8683171.html
*/
const Signal = require('libsignal')
// crypto
// Signal {
// crypto: {
// deriveSecrets: [Function: deriveSecrets],
// decrypt: [Function: decrypt],
// encrypt: [Function: encrypt],
// hash: [Function: hash],
// calculateMAC: [Function: calculateMAC],
// verifyMAC: [Function: verifyMAC]
// },
// curve: {
// createKeyPair: [Function (anonymous)],
// calculateAgreement: [Function (anonymous)],
// calculateSignature: [Function (anonymous)],
// verifySignature: [Function (anonymous)],
// generateKeyPair: [Function (anonymous)]
// },
// keyhelper: {
// generateIdentityKeyPair: [Function (anonymous)],
// generateRegistrationId: [Function (anonymous)],
// generateSignedPreKey: [Function (anonymous)],
// generatePreKey: [Function (anonymous)]
// },
// ProtocolAddress: [class ProtocolAddress],
// SessionBuilder: [class SessionBuilder],
// SessionCipher: [class SessionCipher],
// SessionRecord: [class SessionRecord],
// SignalError: [class SignalError extends Error],
// UntrustedIdentityKeyError: [class UntrustedIdentityKeyError extends SignalError],
// SessionError: [class SessionError extends SignalError],
// MessageCounterError: [class MessageCounterError extends SessionError],
// PreKeyError: [class PreKeyError extends SessionError]
//}
console.log('Signal', Signal)
// 1. 生成身份密钥对 身份密钥对
const identityKeyPair = Signal.keyhelper.generateIdentityKeyPair()
// 2. 生成注册ID
const registrationId = Signal.keyhelper.generateRegistrationId()
// 3. 生成签名预密钥，提供身份密钥对 已签名的预共享密钥
const signedPreKey = Signal.keyhelper.generateSignedPreKey(identityKeyPair, registrationId)
// 4. 生成预密钥
const preKey = Signal.keyhelper.generatePreKey(registrationId)
console.log('生成密钥对', identityKeyPair)
console.log('生成注册ID', registrationId)
console.log('生成签名预密钥', signedPreKey)
console.log('生成预密钥', preKey)
// 5. 在注册时，WhatsApp 客户端将身份公钥（public Identity Key）、已签名的预共享公钥（public Signed Pre Key）
// 和一批一次性预共享公钥（One-Time Pre Keys）发送给服务器。服务器存储用户身份相关的公钥。 服务器无法访问任何客户端的私钥。
// 6. 会话
// 接受对方的公钥、已签名的预共享公钥、一次性预共享密钥（One-Time Pre Keys）来生成一个会话密钥。
// const fpublicKey = 'receiver_public_key'
// const fsignedPreKey = 'receiver_signed_pre_key'
// const fpreKey = 'receiver_pre_key'
// //
// // 6. 发送方使用接收方的身份密钥和会话密钥加密消息
// const senderSessionBuilder = new Signal.SessionBuilder(identityKeyPair, 'receiver_device_id')
// const senderCipherText = senderSessionBuilder.processPreKey(preKey)
// // 7. 接收方使用自己的身份密钥和会话密钥解密消息
// const receiverSessionBuilder = new Signal.SessionBuilder(identityKeyPair, 'sender_device_id')
// const receiverPlainText = receiverSessionBuilder.process(senderCipherText)
// // 8. 使用协商好的临时对话密钥对消息进行加密
// const senderCipher = new Signal.SessionCipher(identityKeyPair, registrationId, 'receiver_device_id')
// const message = '你好，世界！'
// const encryptedMessage = senderCipher.encrypt(message)
// // 9. 解密接收到的消息
// const receiverCipher = new Signal.SessionCipher(identityKeyPair, registrationId, 'sender_device_id')
// const decryptedMessage = receiverCipher.decrypt(encryptedMessage)
// console.log('解密后的消息:', decryptedMessage)