使用 Java 使用提供的密钥和 iv 解密 openssl aes-256-cbc

问题描述

我一直在寻找一个 Java 代码示例来执行以下操作，但没有成功.我正在为我的特定情况寻找解决方案.

I have been searching for a Java code example to do the following but have been unsuccessful. I'm looking for a solution for my particular situation.

使用testtest"为密码生成了密钥和IV:

A key and IV have been generated using "testtest" for a password:

openssl enc -aes-256-cbc -P
salt=2855243412E30BD7
key=E4A38479A2349177EAE6038A018483318350E7F5430BDC8F82F1974715CB54E5
iv=629E2E1500B6BA687A385D410D5B08E3

一个文件(命名文本)已在 Linux 上使用 openssl 命令加密:

A file(named text) has been encrypted on Linux using openssl command:

openssl enc -aes-256-cbc -K
E4A38479A2349177EAE6038A018483318350E7F5430BDC8F82F1974715CB54E5 -iv
629E2E1500B6BA687A385D410D5B08E3 -e -in text -out text_ENCRYPTED

可以使用以下方法成功解密:

It can be decrypted successfully using:

openssl enc -aes-256-cbc -K
E4A38479A2349177EAE6038A018483318350E7F5430BDC8F82F1974715CB54E5 -iv
629E2E1500B6BA687A385D410D5B08E3 -d -in text_ENCRYPTED -out text_DECRYPTED

我可以访问加密文件、盐、密钥和 iv.我不相信我会收到密码.此外，我已经安装了无限强度 JCE 策略.到目前为止，我只找到了另一个 Java 程序进行加密并生成这些参数的示例.对于我的情况，我必须使用提供给我的 salt、key 和 iv 值来解密文件.这可以用 Java 实现吗?请记住我受此配置约束，非常感谢您的时间和帮助.

I have access to the encrypted file, the salt, the key and the iv. I do not believe I'm going to receive the password. Also, i have installed the unlimited strength JCE policy. So far I have only found examples where another java program does the encryption and generates these parameters. For my case I must use the salt, key and iv values given to me to decrypt a file. Is this possible with Java? Please remember I'm bound by this configuration, thank you very much for your time and help.

推荐答案

你应该使用这样的东西:

You should use something like this:

InputStream cipherInputStream = null;
try {
    final StringBuilder output = new StringBuilder();
    final byte[] secretKey = javax.xml.bind.DatatypeConverter.parseHexBinary("E4A38479A2349177EAE6038A018483318350E7F5430BDC8F82F1974715CB54E5");
    final byte[] initVector = javax.xml.bind.DatatypeConverter.parseHexBinary("629E2E1500B6BA687A385D410D5B08E3");
    final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(secretKey, "AES"), new IvParameterSpec(initVector, 0, cipher.getBlockSize()));
    cipherInputStream = new CipherInputStream(new FileInputStream("text_ENCRYPTED"), cipher);

    final String charsetName = "UTF-8";

    final byte[] buffer = new byte[8192];
    int read = cipherInputStream.read(buffer);

    while (read > -1) {
        output.append(new String(buffer, 0, read, charsetName));
        read = cipherInputStream.read(buffer);
    }

    System.out.println(output);
} finally {
    if (cipherInputStream != null) {
        cipherInputStream.close();
    }
}

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