bcryptjs盐为字符串

问题描述

bcryptjs程序包中,有一种hash(s,salt)方法

/**
 * Asynchronously generates a hash for the given string.
 * @param s                String to hash
 * @param salt             Salt length to generate or salt to use
 * @return Promise with resulting hash,if callback has been omitted
 */
export declare function hash(s: string,salt: number | string): Promise<string>;

使用数字salt参数是有意义的,但是如果盐是string会怎样? 我可以在这里使用任何随机字符串吗?

解决方法

如果看示例in the package docs,则盐字符串是函数genSalt返回的值。您不能使用随机字符串(尝试一下,将会发现异常)。

数字不是字符串的长度,它是哈希函数的成本因素-将其加1将使计算哈希所需的时间加倍。

一些例子来说明:

> var bcrypt = require('bcryptjs');
undefined
> bcrypt.genSaltSync(12)
'$2a$12$MDnofLJT8LrIILyh8SCle.'
> bcrypt.genSaltSync(14)
'$2a$14$fuc6ZCGfcUmsG.GiUYmdGe'
> bcrypt.hashSync("password",bcrypt.genSaltSync(12))
'$2a$12$NowrlsgseFUgTxlAUZ3jw.uZyf2uuZkeaoZU0r997DLd00/y0yp6e'
> bcrypt.hashSync("password",bcrypt.genSaltSync(15))
'$2a$15$xOjjGl6f60A3zUck6HhSEu/UcLLG//EkbDTKl6GFy3jNTgT..kQPC'
> bcrypt.hashSync("password",12)
'$2a$12$Ks072IiTxgBYG9atJYeHCu7QpnIOylp/VjQmV6vW4mKRh43hYxkcO'
> bcrypt.hashSync("password","invalid")
Uncaught Error: Invalid salt version: in
    at _hash (/home/blah/blah/node_modules/bcryptjs/dist/bcrypt.js:1280:19)
    at Object.bcrypt.hashSync (/home/blah/blah/node_modules/bcryptjs/dist/bcrypt.js:190:16)