7

我正在尝试使用节点加密提供的 aes-128-gcm 来实现加密/解密功能。据我了解，gcm 对密文进行加密，但也会对其进行哈希处理并将其作为“身份验证标签”提供。但是，我不断收到错误消息：“不受支持的状态或无法验证数据”。

我不确定这是否是我的代码中的错误 - 查看加密的密文和身份验证标签，解密函数获取的与加密函数生成的相同。

    function encrypt(plaintext) {
    // IV is being generated for each encryption
    var iv = crypto.randomBytes(12),
        cipher = crypto.createCipheriv(aes,key,iv),
        encryptedData = cipher.update(plaintext),
        tag;

    // Cipher.final has been called, so no more encryption/updates can take place
    encryptedData += cipher.final();

    // Auth tag must be generated after cipher.final()
    tag = cipher.getAuthTag();

    return encryptedData + "$$" + tag.toString('hex') + "$$" + iv.toString('hex');
}

function decrypt(ciphertext) {
    var cipherSplit = ciphertext.split("$$"),
        text = cipherSplit[0],
        tag = Buffer.from(cipherSplit[1], 'hex'),
        iv = Buffer.from(cipherSplit[2], 'hex'),
        decipher = crypto.createDecipheriv(aes,key,iv);

    decipher.setAuthTag(tag);

    var decryptedData = decipher.update(text);

    decryptedData += decipher.final();
}

decipher.final() 抛出错误。

4

2 回答 2

7

如果有人仍然试图获得加密和解密过程的工作示例。

我留下了一些应该考虑的评论。

import * as crypto from 'crypto';

const textToEncode = 'some secret text'; // utf-8
const algo = 'aes-128-gcm';

// Key bytes length depends on algorithm being used:
// 'aes-128-gcm' = 16 bytes
// 'aes-192-gcm' = 24 bytes
// 'aes-256-gcm' = 32 bytes
const key = crypto.randomBytes(16);

const iv = crypto.randomBytes(16);
const cipher = crypto.createCipheriv(algo, key, iv);

const encrypted = Buffer.concat([
  cipher.update(Buffer.from(textToEncode, 'utf-8')),
  cipher.final(),
]);

const authTag = cipher.getAuthTag();

console.info('Value encrypted', {
  valueToEncrypt: textToEncode,
  encryptedValue: encrypted.toString('hex'),
  authTag: authTag.toString('hex'),
});

// It's important to use the same authTag and IV that were used during encoding
const decipher = crypto.createDecipheriv(algo, key, iv);
decipher.setAuthTag(authTag);

const decrypted = Buffer.concat([
  decipher.update(encrypted),
  decipher.final(),
]);

console.info('Value decrypted', {
  valueToDecrypt: encrypted.toString('hex'),
  decryptedValue: decrypted.toString('utf-8'),
});
于 2021-08-07T11:52:59.017 回答
6

我设法解决了这个问题：问题是我没有为 cipher.final() 指定编码类型，而是在字符串中返回它，所以它没有返回 Buffer 对象，而 decipher.final() 是期待。

为了解决这个问题，我在 cipher.update 和 cipher.final 中将 'utf-8' 添加到 'hex' 编码参数，反之亦然。

于 2016-12-21T16:42:38.250 回答