会话密钥的OpenSSL加密 [英] OpenSSL Encryption of Session Key

问题描述

我正在编写一种加密会话密钥的方法。它需要这样做，以便密钥可以由已成功测试的不同程序解密。解密程序不能改变。我遇到的问题是让加密工作的方式与解密程序一致。

I am writing a method that encrypts session keys. It needs to do this such that the key can be decrypted by a different program that has been tested successfully. The decryption program cannot change. Where I am stuck is on getting my encryption to work in a way that it aligns with the decryption routine.

让我先给出解密程序。请记住，这不能改变：

Let me give the decryption routine first. Remember, this cannot change:

public Boolean decryptSessionKey() {

    // first, base64 decode the session key
    String sslString = "openssl base64 -d -in enc_sesskey -out temp";

    try {
        Process p = Runtime.getRuntime().exec(sslString);
    } catch (IOException e2) {
        e2.printStackTrace();
    }

    // now we can decrypt it
    try {
        sslString = "openssl rsautl -in temp -inkey privkey.pem -decrypt";
        Process p = Runtime.getRuntime().exec(sslString);   
        BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));

        try {
            String s;
            while ((s = stdInput.readLine()) != null) {           
                decrypted_session_password = s;
                writeToFile(decrypted_sesskey, s);
            }
            return true;

        } catch (Exception e) {
            return false;
        }
    } catch (IOException e1) {
        return false;
    } catch (Exception e) {
        return false;
    }
}

这是我写的加密例程。我产生base64编码的文本，但它最终不能解密。值得注意的是，我已经验证解密例程正确地获取了加密例程的结果（两者之间没有握手问题）。

Here is the encryption routine that I am writing. I yields base64 encoded text, but it is ultimately not decryptable. It's worth noting that I have verified that the decryption routine correctly picks up the results of the encryption routine (no handshake problems between the two).

public Boolean encryptSessionKey(Cert receiver_cert) {

    String sslString = 
        "openssl rsautl base64 -in sesskey -out temp -inkey cert.pem -encrypt -certin";

    // run this openssl encryption. Note that it will not yet be base64 encoded
    try {
        Process p = Runtime.getRuntime().exec(sslString);
    } catch (IOException e2) {
        e2.printStackTrace();
    }

    // now we base64-encode the encrypted file
    sslString = "openssl base64 -in temp -out enc_sesskey"; 

    try {
        Process p = Runtime.getRuntime().exec(sslString);   
    } catch (IOException e1) {return false;
    } catch (Exception e) {return false;
    }

    return true;
}

我真的被困了。任何帮助表示赞赏。谢谢。

I'm really stuck. Any help is appreciated. Thank you.

推荐答案

使用PKCS填充和从证书获取的公钥进行RSA加密：

RSA encryption with PKCS padding and public key acquired from certificate:

openssl rsautl -encrypt -in sesskey -inkey cert.pem -certin -out temp
openssl base64 -e -in temp -out enc_sesskey

使用PKCS填充和私钥进行RSA解密：

RSA decryption with PKCS padding and private key:

openssl base64 -d -in enc_sesskey -out temp
openssl rsautl -decrypt -in temp -inkey privkey.pem -out sesskey2

测试并确认没问题，因为sesskey文件的内容与sesskey2文件的内容相同。

Tested and confirmed to be OK because content of the "sesskey" file is the same as content of the "sesskey2" file.

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