import * as eccryptoJS from ‘eccrypto-js‘
//加解密函数的参数都是buffer类

//Alice
//一个新的随机的32字节私钥，私钥对应的未压缩（65字节）公钥。
const keyPairA = eccryptoJS.generateKeyPair();
console.info("privateKey:", keyPairA.privateKey);
console.info("publicKey:", keyPairA.publicKey);
//send publicKey to Bob

//Bob
//随机生成AES的密钥
const AESKey = eccryptoJS.randomBytes(32);
console.info("AESKey:", AESKey);
const iv = eccryptoJS.randomBytes(16);

//用ECC加密AES密钥
const EncryptedAESKey = await eccryptoJS.encrypt(keyPairA.publicKey, AESKey);
console.info("EncryptedAESKey:", EncryptedAESKey);

//待发送的明文str，先转成buffer格式
const str = ‘test message to encrypt‘;
const msg = eccryptoJS.utf8ToBuffer(str);

//用未加密的AES密钥加密明文
const ciphertext = await eccryptoJS.aesCbcEncrypt(iv, AESKey, msg);
console.info("ciphertext:", ciphertext);
//send 密文encrypt_str and AESKeyEncrypt to Alice，iv？

//Alice
//用私钥解密加密后的AES密钥
const DecryptedAESKey = await eccryptoJS.decrypt(keyPairA.privateKey, EncryptedAESKey);
console.info("decryptedAESKey:", DecryptedAESKey);
//用AES密钥解密明文
const decrypted = await eccryptoJS.aesCbcDecrypt(iv, DecryptedAESKey, ciphertext);
console.info("decrypted:", decrypted.toString());