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Legal StudiesNode.js 中的 cipher.final() 方法
cipher.final() 用来返回一个 buffer 或者包含 cipher 对象值的字符串。它是加密模块的 Cipher 类中提供的内置方法之一。如果指定了输出编码，则会返回一个 String。如果未指定输出编码，则会返回一个 buffer。多次调用 cipher.final 方法会引发错误。
语法
cipher.final([outputEncoding])
参数
以上参数说明如下 −
outputEncoding – 它将输出编码作为参数。此参数的输入类型为字符串。可能的输入值有 hex、base64 等。
示例
创建一个名为 cipherFinal.js 的文件，并复制以下代码片段。创建文件后，使用以下命令运行此代码，如下面的示例所示 −
node cipherFinal.js
cipherFinal.js
// Example to demonstrate the use of cipher.final() method
// Importing the crypto module
const crypto = require('crypto');
// Initialising the AES algorithm
const algorithm = 'aes-192-cbc';
// Initialising the password used for generating key
const password = '12345678';
// Retrieving key for the cipher object
const key = crypto.scryptSync(password, 'salt', 24);
// Initializing the static iv
const iv = Buffer.alloc(16, 0);
// Initializing the cipher object to get cipher
const cipher = crypto.createCipheriv(algorithm, key, iv);
const cipher2 = crypto.createCipheriv(algorithm, key, iv);
//Getting the string value as outputEncoding is defined
let hexValue = cipher.final('hex');
let base64Value = cipher2.final('base64');
// Printing the result...
console.log("Hex String:- " + hexValue);
console.log("Base64 String:- " + base64Value)输出
C:\home
ode>> node cipherFinal.js Hex String:- 8d11772fce59f08e7558db5bf17b3112 Base64 String:- jRF3L85Z8I51WNtb8XsxEg==
示例
我们再来看看另一个示例。
// Example to demonstrate the use of cipher.final() method
// Importing the crypto module
const crypto = require('crypto');
// Initialising the AES algorithm
const algorithm = 'aes-192-cbc';
// Initialising the password used for generating key
const password = '12345678';
// Retrieving key for the cipher object
const key = crypto.scryptSync(password, 'salt', 24);
crypto.scrypt(password, 'salt', 24,
{ N: 512 }, (err, key) => {
if (err) throw err;
// Initializing the static iv
const iv = Buffer.alloc(16, 0);
// Initializing the cipher object to get cipher
const cipher = crypto.createCipheriv(algorithm, key, iv);
//Getting the buffer value since output encoding is null
let hexValue = cipher.final();
let base64Value = cipher.final('base64');
// Printing the result...
console.log("Buffer:- " + hexValue);
console.log("Base64 String:- " + base64Value)
});输出
C:\home
ode>> node cipherFinal.js internal/crypto/cipher.js:164 const ret = this._handle.final(); ^ Error: Unsupported state at Cipheriv.final (internal/crypto/cipher.js:164:28) at Object. (/home/node/test/cipher.js:22:26) at Module._compile (internal/modules/cjs/loader.js:778:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3) at Function.Module.runMain (internal/modules/cjs/loader.js:831:12) at startup (internal/bootstrap/node.js:283:19) at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
在上述示例中，我们遇到了错误，因为我们已经获得了该密钥的密码。因为这是一个最终方法，所以当我们尝试再次查找同一密钥的密码时，它会出错。
更新于: 2021 年 5 月 20 日
605 次浏览
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