在java sha1 openssl中解密aes加密文件

Question

我試圖通過引用此代碼來實現文件解密：

加密部分我已經做了這樣的方式：HTTPS // stackoverflow.com /問題/ 64423926 /加密文件功能於Java的和解密功能於的OpenSSL與鍵-AES

而且加密文件我可以用openssl解密。

但是在java中解密到文件導致錯誤：

java.lang.IllegalArgumentException: Illegal base64 character 5f
    at java.util.Base64$Decoder.decode0(Unknown Source)
    at java.util.Base64$Decoder.decode(Unknown Source)
    at java.util.Base64$Decoder.decode(Unknown Source)
    at aes.AesEncryptTask.decryptNew(AesEncryptTask.java:107)
    at aes.AesEncryptTask.main(AesEncryptTask.java:58)

我的加密文件中的內容是：

Salted__¨‹–1ž#¡ð=—ÖÏùá•NEÄ

注意：開始加鹽的部分不是 base64 編碼的。 以下數據被編碼。

請建議正確實現文件解密。

static void decryptNew(String path,String password, String outPath) {
        try{
        FileInputStream fis = new FileInputStream(path);
        FileOutputStream fos = new FileOutputStream(outPath);
        final byte[] pass = password.getBytes(StandardCharsets.US_ASCII);
        //final byte[] inBytes = Base64.getDecoder().decode(source);
        String source = getFileContent(fis);
        final Decoder decoder = Base64.getDecoder();
        final byte[] inBytes = decoder.decode(source);
        //final byte[] inBytes =source.getBytes();//DatatypeConverter.parseBase64Binary(source);
        final byte[] shouldBeMagic = Arrays.copyOfRange(inBytes, 0, SALTED_MAGIC.length);
        if (!Arrays.equals(shouldBeMagic, SALTED_MAGIC)) {
            throw new IllegalArgumentException("Initial bytes from input do not match OpenSSL SALTED_MAGIC salt value.");
        }
        final byte[] salt = Arrays.copyOfRange(inBytes, SALTED_MAGIC.length, SALTED_MAGIC.length + 8);
        final byte[] passAndSalt = array_concat(pass, salt);
        byte[] hash = new byte[0];
        byte[] keyAndIv = new byte[0];
        for (int i = 0; i < 3 && keyAndIv.length < 48; i++) {
            final byte[] hashData = array_concat(hash, passAndSalt);
            MessageDigest md = null;
            md = MessageDigest.getInstance("SHA-1");
            hash = md.digest(hashData);
            keyAndIv = array_concat(keyAndIv, hash);
        }

        final byte[] keyValue = Arrays.copyOfRange(keyAndIv, 0, 32);
        final SecretKeySpec key = new SecretKeySpec(keyValue, "AES");

        final byte[] iv = Arrays.copyOfRange(keyAndIv, 32, 48);

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
        final byte[] clear = cipher.doFinal(inBytes, 16, inBytes.length - 16);
        String contentDecoded = new String(clear, StandardCharsets.UTF_8);
        
        fos.write(contentDecoded.getBytes());    
        fos.close();
        
        //cipher.init(Cipher.DECRYPT_MODE, sks);
        /*CipherInputStream cis = new CipherInputStream(fis, cipher);
        int b;
        byte[] d = new byte[8];
        while((b = cis.read(d)) != -1) {
            fos.write(d, 0, b);
        }
        fos.flush();
        fos.close();
        cis.close();*/
        
        System.out.println("Decrypt is completed");
        }catch(Exception e){
            e.printStackTrace();
            
        }
    }

Answer 1

下面的代碼正在做一個完整的文件加密和解密，並且兼容 OpenSSL 命令

encrypt: openssl enc -aes-256-cbc -pass pass:testpass -d -p -in plaintext.txt -out plaintext.txt.crypt -md md5
decrypt: openssl aes-256-cbc -d -in plaintext.txt.crypt -out plaintext1.txt -k testpass -md md5

我遺漏了一些變量，因為它們沒有在解密方法中使用，另一方面用純 Java 版本替換了 byte[] 連接。

簡單的輸出是：

encrypt done plaintext.txt
ciphertext: plaintext.txt
Decrypt is completed

安全警告：密鑰派生已棄用，不應再使用。 該代碼沒有任何異常處理，僅用於教育目的。

代碼：

import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.*;
import java.util.Arrays;

public class MainSo {
    public static void main(String[] args) {
        System.out.println("https://stackoverflow.com/questions/64443373/decrypt-aes-encrypted-file-in-java-sha1-openssl?noredirect=1#comment113960588_64443373");
        String plaintextFilename = "plaintext.txt";
        String ciphertextFilename = "plaintext.txt.crypt";
        String decryptedtextFilename = "plaintextDecrypted.txt";
        String password = "testpass";

        // openssl equivalent:
        // decrypt: openssl aes-256-cbc -d -in plaintext.txt.crypt -out plaintext1.txt -k testpass -md md5
        // encrypt: openssl enc -aes-256-cbc -pass pass:testpass -d -p -in sample.crypt -out sample.txt -md md5

        String ciphertext = encryptfile(plaintextFilename, password);
        System.out.println("ciphertext: " + ciphertext);
        decryptNew(ciphertextFilename, password, decryptedtextFilename);
    }

    public static String encryptfile(String path, String password) {
        try {
            FileInputStream fis = new FileInputStream(path);
            FileOutputStream fos = new FileOutputStream(path.concat(".crypt"));
            final byte[] pass = password.getBytes(StandardCharsets.UTF_8);
            final byte[] salt = (new SecureRandom()).generateSeed(8);
            fos.write("Salted__".getBytes(StandardCharsets.UTF_8));
            fos.write(salt);
            final byte[] passAndSalt = concatenateByteArrays(pass, salt);
            byte[] hash = new byte[0];
            byte[] keyAndIv = new byte[0];
            for (int i = 0; i < 3 && keyAndIv.length < 48; i++) {
                final byte[] hashData = concatenateByteArrays(hash, passAndSalt);
                final MessageDigest md = MessageDigest.getInstance("MD5");
                hash = md.digest(hashData);
                keyAndIv = concatenateByteArrays(keyAndIv, hash);
            }
            final byte[] keyValue = Arrays.copyOfRange(keyAndIv, 0, 32);
            final byte[] iv = Arrays.copyOfRange(keyAndIv, 32, 48);
            final SecretKeySpec key = new SecretKeySpec(keyValue, "AES");
            final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
            CipherOutputStream cos = new CipherOutputStream(fos, cipher);
            int b;
            byte[] d = new byte[8];
            while ((b = fis.read(d)) != -1) {
                cos.write(d, 0, b);
            }
            cos.flush();
            cos.close();
            fis.close();
            System.out.println("encrypt done " + path);
        } catch (IOException | NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        }
        return path;
    }

    static void decryptNew(String path,String password, String outPath) {
        byte[] SALTED_MAGIC = "Salted__".getBytes(StandardCharsets.UTF_8);
        try{
            FileInputStream fis = new FileInputStream(path);
            FileOutputStream fos = new FileOutputStream(outPath);
            final byte[] pass = password.getBytes(StandardCharsets.US_ASCII);
            final byte[] inBytes = Files.readAllBytes(Paths.get(path));
            final byte[] shouldBeMagic = Arrays.copyOfRange(inBytes, 0, SALTED_MAGIC.length);
            if (!Arrays.equals(shouldBeMagic, SALTED_MAGIC)) {
                throw new IllegalArgumentException("Initial bytes from input do not match OpenSSL SALTED_MAGIC salt value.");
            }
            final byte[] salt = Arrays.copyOfRange(inBytes, SALTED_MAGIC.length, SALTED_MAGIC.length + 8);
            final byte[] passAndSalt = concatenateByteArrays(pass, salt);
            byte[] hash = new byte[0];
            byte[] keyAndIv = new byte[0];
            for (int i = 0; i < 3 && keyAndIv.length < 48; i++) {
                final byte[] hashData = concatenateByteArrays(hash, passAndSalt);
                MessageDigest md = null;
                md = MessageDigest.getInstance("MD5");
                hash = md.digest(hashData);
                keyAndIv = concatenateByteArrays(keyAndIv, hash);
            }
            final byte[] keyValue = Arrays.copyOfRange(keyAndIv, 0, 32);
            final SecretKeySpec key = new SecretKeySpec(keyValue, "AES");
            final byte[] iv = Arrays.copyOfRange(keyAndIv, 32, 48);
            final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
            final byte[] clear = cipher.doFinal(inBytes, 16, inBytes.length - 16);
            String contentDecoded = new String(clear, StandardCharsets.UTF_8);
            fos.write(contentDecoded.getBytes());
            fos.close();
            System.out.println("Decrypt is completed");
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    public static byte[] concatenateByteArrays(byte[] a, byte[] b) {
        return ByteBuffer
                .allocate(a.length + b.length)
                .put(a).put(b)
                .array();
    }
}