如何在jsbn typescript中访问SecureRandom？

Question

我过去常常这样访问jsbn.js中的SecureRandom

var jsbn = require('jsbn');
var SecureRandom = jsbn.SecureRandom;
var secureRandom = new SecureRandom();
secureRandom.nextBytes(x);

如何在jsbn.ts中访问它？因为要导入的函数似乎有限

 import jsbn, {BigInteger, RandomGenerator as SecureRandom} from "jsbn";

package.json

"dependencies": {
  "jsbn": "^1.1.0"
},
"devDependencies": {
  "@types/jsbn": "^1.2.29",
}

谢谢。

Answer 1

@types/jsbn npm包只提供RandomGenerator接口的声明，并不导出SecureRandom：

export interface RandomGenerator {
    nextBytes(bytes: number[]): void;
}

您应该使用作为WebAPI Crypto getRandomValues()的prng来实现该接口和此nextBytes方法

例如：

class SecureRandomGenerator implements RandomGenerator {

    private static getRandomBytes(size: number): Uint8Array {
        // User agent WebAPI Crypto
        if (typeof window !== "undefined" && window.crypto && window.crypto.getRandomValues) {
            return window.crypto.getRandomValues(new Uint8Array(size));
        }

        throw new Error("Web API Crypto is not available");
    }

    public nextBytes(bytes: number[]): void {
        const generatedBytes = SecureRandomGenerator.getRandomBytes(bytes.length);
        for (let i = 0; i < bytes.length; i++) {
            bytes[i] = generatedBytes[i];
        }
    }

}