用Node.js解密AES-256-CBC密码
用Node.js解密AES-256-CBC密码
提问于 2022-07-05 07:42:13
我正试图使用Node.js从web服务中解密一个AES-256-CBC密文，但似乎无法让它工作，而且真的丢失了。
const raw = `{
"iv":"uUwGJgxslfYiahji3+e2jA==",
"docMimeType":"text\/xml",
"doc":"1XLjWZlMMrgcpR6QtfwExQSOOPag1BJZTo1QEkcDrY6PFesWoVw8xrbHFsEYyMVDeemzk+5kBnb3\r\nqBmcUtkSFs7zDsxjYZkkEU9nyq1jXFz99fGylIealw37FPMaK0gviXESRO5AHMs46tpgSQcuWX0Z\r\nV7+mnTvjmaRHi4p1Cvg8aYfDO1aIWWWjAwOTCyopyCwribbGoEdiYDc5pERHpw=="
}`;
const cleanedEncryptedDataAsJsonStr = raw.replace(/\r?\n|\r/g, " ")
const data = JSON.parse(cleanedEncryptedDataAsJsonStr)
const ivBase64 = data.iv
const iv = Buffer.from(ivBase64, 'base64').toString('hex').substring(0, 16)
const plainKey = 'PHilheaLthDuMmyciPHerKeyS'
const hashKey = crypto.createHash('sha256');
hashKey.update(plainKey)
const key = hashKey.digest('hex').substring(0, 32)
let encrypted = Buffer.from(data.doc, 'base64').toString('hex')
const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv)
let decrypted = decipher.update(encrypted, 'hex', 'utf-8')
decrypted += decipher.final('utf-8')因此，我正在接收一个包含iv和加密数据(Doc)的json对象，并且我有一个密码密钥的副本，根据文档需要在解密过程中对其进行散列。
doc：加密数据的base64编码
iv：加密过程中初始化向量的base64编码值
当我运行代码时，错误是：
Error: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length，也不确定如何在原始的json字符串中处理\r\n。
解密后的消息应该是：
<eEMPLOYERS ASOF="07-02-2022"><employer pPEN="110474000002" pEmployerName="JOSE A TERAMOTO ODM" pEmployerAddress="ORANBO, PASIG CITY"/></eEMPLOYERS
回答 1
Stack Overflow用户
回答已采纳
发布于 2022-07-05 09:12:30
守则中存在以下问题：
- IV和key不能被十六进制编码。
- 默认的PKCS#7填充必须禁用，因为零填充是在加密期间应用的(如果需要，显式删除尾随的0x00填充字节)。
固定代码：
var crypto = require('crypto')
const raw = `{
"iv":"uUwGJgxslfYiahji3+e2jA==",
"docMimeType":"text\/xml",
"doc":"1XLjWZlMMrgcpR6QtfwExQSOOPag1BJZTo1QEkcDrY6PFesWoVw8xrbHFsEYyMVDeemzk+5kBnb3\r\nqBmcUtkSFs7zDsxjYZkkEU9nyq1jXFz99fGylIealw37FPMaK0gviXESRO5AHMs46tpgSQcuWX0Z\r\nV7+mnTvjmaRHi4p1Cvg8aYfDO1aIWWWjAwOTCyopyCwribbGoEdiYDc5pERHpw=="
}`;
const cleanedEncryptedDataAsJsonStr = raw.replace(/\r?\n|\r/g, " ")
const data = JSON.parse(cleanedEncryptedDataAsJsonStr)
const ivBase64 = data.iv
const iv = Buffer.from(ivBase64, 'base64') // .toString('hex').substring(0, 16) // Fix 1: no hex encoding
const plainKey = 'PHilheaLthDuMmyciPHerKeyS'
const hashKey = crypto.createHash('sha256')
hashKey.update(plainKey)
const key = hashKey.digest() // .digest('hex').substring(0, 32) // Fix 2: no hex encoding
let encrypted = Buffer.from(data.doc, 'base64').toString('hex')
const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv)
decipher.setAutoPadding(false) // Fix 3: disable default PKCS#7 padding
let decrypted = decipher.update(encrypted, 'hex', 'utf-8')
decrypted += decipher.final('utf-8')
console.log(decrypted) // plaintext zero-padded, if necessary remove trailing 0x00 values, e.g. as in the following:
console.log(decrypted.replace(new RegExp("\0+$"), "")) // <eEMPLOYERS ESOF="07-02-2022"><employer pPEN="110474000002" pEmployerName="JOSE A TERAMOTO ODM" pEmployerAddress="ORANBO, PASIG CITY"/></eEMPLOYERS>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/72865693
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