无法在节点js中使用“ aes-256-cbc”算法解密pdf文件

如何解决无法在节点js中使用“ aes-256-cbc”算法解密pdf文件

我正在尝试使用节点js解密PDF文件，第三方使用C＃加密PDF文件。

我很难过，因为我不断收到此错误：

 D:\IMP\DevOps Implementation\New folder (2)> node index1.js
internal/crypto/cipher.js:172
  const ret = this[kHandle].final();
                            ^
Error: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt
    at Decipheriv.final (internal/crypto/cipher.js:172:29)
    at Object.AESCrypt.decrypt (D:\IMP\DevOps Implementation\New folder (2)\index1.js:12:18)
    at D:\IMP\DevOps Implementation\New folder (2)\index1.js:57:24
    at FSReqCallback.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:63:3) {
  library: 'digital envelope routines',function: 'EVP_DecryptFinal_ex',reason: 'bad decrypt',code: 'ERR_OSSL_EVP_BAD_DECRYPT'
}

我们正在使用以下代码进行加密（C＃）

  private void FileEncrypt(string inputFile,string outputfile,string password)

        {

            byte[] salt = GenerateSalt();

            byte[] passwords = Encoding.UTF8.GetBytes(password);

            RijndaelManaged AES = new RijndaelManaged();

            AES.KeySize = 256;

            AES.BlockSize = 128;

            

            var key = new Rfc2898DeriveBytes(passwords,salt,50000);

            AES.Key = key.GetBytes(AES.KeySize / 8);

            AES.IV = key.GetBytes(AES.BlockSize / 8);

            AES.Mode = CipherMode.CBC;

            AES.Padding = PaddingMode.Zeros;

            using (FileStream fsCrypt = new FileStream(inputFile + ".aes",FileMode.Create))

            {

                fsCrypt.Write(salt,salt.Length);

                using (CryptoStream cs = new CryptoStream(fsCrypt,AES.CreateEncryptor(),CryptoStreamMode.Write))

                {

                    using (FileStream fsIn = new FileStream(inputFile,FileMode.Open))

                    {

                        byte[] buffer = new byte[1048576];

                        int read;

                        while ((read = fsIn.Read(buffer,buffer.Length)) > 0)

                        {

                            cs.Write(buffer,read);

                        }

                    }

                }

            }

        }

我们正在使用以下代码进行解密（Node js）

AESCrypt.encrypt = function(cryptkey,iv,cleardata) {
    var encipher = crypto.createCipheriv('aes-256-cbc',cryptkey,iv);
    return Buffer.concat([
        encipher.update(cleardata),encipher.final()
    ]);
}

function decrypted(){
var enc;
fs.readFile('./resource/test.pdf',function (err,data) {
    if (err) {
        return console.log(err);
    }
    
    var bufferenc = new Buffer.from(data); 

    var dec = AESCrypt.decrypt(cryptkey,bufferenc);    
        console.log(dec);
   // var buffer = new Buffer.from(dec);                                          
    fs.writeFileSync('./resource/decrypted.pdf',dec); 
    
});
}

无法在节点js中使用“ aes-256-cbc”算法解密pdf文件

解决方法

您可以尝试使用以下代码对pdf数据进行解密，它对C＃代码来说对我有用：

const fs = require('fs');
const crypto = require("crypto");

function FileDecrypt(inputFile,outputfile,password)
{
    // Read the entire file into the buffer.
    let buffer = fs.readFileSync(inputFile);

    // Read the first eight bytes as a salt.
    let salt = buffer.slice(0,8);
    let cipherText = buffer.slice(8);

    // use key derivation function to get key and iv.
    let derivedBytes = crypto.pbkdf2Sync(password,salt,50000,48,"sha1");
    let key = derivedBytes.slice(0,32);
    let iv = derivedBytes.slice(32);

    let cipher = crypto.createDecipheriv('aes-256-cbc',key,iv);
    // Switch off auto padding in this context
    cipher.setAutoPadding(false);

    let decryptedData = Buffer.concat([cipher.update(cipherText),cipher.final()]);
    fs.writeFileSync(outputfile,decryptedData);    
}

FileDecrypt("encrypted.pdf","node-decrypted.pdf","password");