TypeError: 无法读取 undefined 的属性 'elGamal'

以下是一个代码片段。每当我执行它时，都会出现上述错误 `const sjcl = require("sjcl"); var gkey1 = sjcl.ecc.elGamal.generateKeys(384, 10); var alicekeys = gkey1.pub.kem(10);

var gkey2 = sjcl.ecc.elGamal.generateKeys(384, 10); var bobkeys = gkey2.pub.kem(10);

var aliceshared = alicekeys.key; var bobshared = gkey2.sec.unkem(alicekeys.tag);`