将RSA私钥转换为Java中的DER格式

发布于 2025-02-12 01:06:50 字数 436 浏览 0 评论 0原文

我有一个.pem文件，其中包含这种格式的私钥：

-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA3wVu5KhHVJjc9ri5mWKNDW5xXe08smNeu2GSAdBwEaGBHaWj
...
xqDDtaoYKUvwhuKHboTJMs9CtQyrVNk+TDSdfaEdTEWTNeu2UwaP4QBhA==
-----END RSA PRIVATE KEY-----

如果我想使用openssl手动转换它，我将使用此命令：

openssl pkcs8 -topk8 -inform PEM -outform DER -in secret.pem -nocrypt secret.key

但是，我想使用Java以编程方式进行操作，但我无法弄清楚如何。任何帮助都非常感谢

原文

I have a .pem file that contains the private key in this format:

-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA3wVu5KhHVJjc9ri5mWKNDW5xXe08smNeu2GSAdBwEaGBHaWj
...
xqDDtaoYKUvwhuKHboTJMs9CtQyrVNk+TDSdfaEdTEWTNeu2UwaP4QBhA==
-----END RSA PRIVATE KEY-----

If I want to convert it manually using OpenSSL I would use this command:

openssl pkcs8 -topk8 -inform PEM -outform DER -in secret.pem -nocrypt secret.key

However, I want to do that programmatically using java but I couldn't figure out how.
Any help is much appreciated

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过期以后 2025-02-19 01:06:51

OpenSSL语句将PKCS＃1格式中的PEM编码的私钥转换为PKCS＃8格式中的DER编码键。

在Java中，可以使用EG bouncycascelle's > pemparser 和jcapemkeyconverter（使用bcprov und und bcpkix jars）。可以使用privateKey＃getEncoded（）返回DER编码的PKCS＃8专用密钥：

import java.io.FileOutputStream;
import java.io.FileReader;
import java.security.KeyPair;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
...
String inputFile = "<path to PKCS#1 PEM key>";
String outputFile = "<path to PKCS#8 DER key>";
try (FileReader fileReader = new FileReader(inputFile);
     PEMParser pemParser = new PEMParser(fileReader);
     FileOutputStream outputStream = new FileOutputStream(outputFile)) {
    // Import PEM encoded PKCS#1 private key
    JcaPEMKeyConverter converter = new JcaPEMKeyConverter();
    KeyPair keyPair = converter.getKeyPair((PEMKeyPair)pemParser.readObject());
    // Export DER encoded PKCS#8 private key
    byte[] privateKey = keyPair.getPrivate().getEncoded();
    outputStream.write(privateKey, 0, privateKey.length);
}

The OpenSSL statement converts the PEM encoded private key in PKCS#1 format into a DER encoded key in PKCS#8 format.

In Java, importing the PEM encoded PKCS#1 private key can be done with e.g. BouncyCastle's PEMParser and JcaPEMKeyConverter (using the bcprov und bcpkix jars). The export can be accomplished with PrivateKey#getEncoded() which returns the DER encoded PKCS#8 private key:

import java.io.FileOutputStream;
import java.io.FileReader;
import java.security.KeyPair;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
...
String inputFile = "<path to PKCS#1 PEM key>";
String outputFile = "<path to PKCS#8 DER key>";
try (FileReader fileReader = new FileReader(inputFile);
     PEMParser pemParser = new PEMParser(fileReader);
     FileOutputStream outputStream = new FileOutputStream(outputFile)) {
    // Import PEM encoded PKCS#1 private key
    JcaPEMKeyConverter converter = new JcaPEMKeyConverter();
    KeyPair keyPair = converter.getKeyPair((PEMKeyPair)pemParser.readObject());
    // Export DER encoded PKCS#8 private key
    byte[] privateKey = keyPair.getPrivate().getEncoded();
    outputStream.write(privateKey, 0, privateKey.length);
}

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枉心 2025-02-19 01:06:51

您可以在背景中的控制台中运行任务。因此，您可以使用ProcessBuilder。

//split the command every space and create a process builder
String[] commands = "your command written above...".split(" ");
ProcessBuilder pb = new ProcessBuilder(commands);
// starting the process
Process process = pb.start();

如果您需要读取控制台输出（而不是输出文件），则可以使用输入流：

// for reading the output from stream
BufferedReader stdInput = new BufferedReader(new InputStreamReader(
            process.getInputStream()));
String s = null;
while ((s = stdInput.readLine()) != null) {
    System.out.println(s);
}

我没有特别测试此代码。如果您需要更多信息，请随时询问或访问此网站：

You can run the task in a console in the background. Therefor you can use a ProcessBuilder.

//split the command every space and create a process builder
String[] commands = "your command written above...".split(" ");
ProcessBuilder pb = new ProcessBuilder(commands);
// starting the process
Process process = pb.start();

If you need to read the console output (instead of an output file) you can use an input stream:

// for reading the output from stream
BufferedReader stdInput = new BufferedReader(new InputStreamReader(
            process.getInputStream()));
String s = null;
while ((s = stdInput.readLine()) != null) {
    System.out.println(s);
}

I haven't tested this code in particular. If you need more info feel free to ask or visit this website: Process Builder

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~没有更多了~