密钥库和私钥迁移

密钥库和私钥迁移通常涉及将密钥和证书从一个密钥库（keystore）或私钥文件（.pem或.pkcs12）导出到另一个密钥库或私钥文件中。下面是一个Java代码示例，演示了如何实现密钥库和私钥的迁移。

1. 导出密钥库中的私钥和证书到私钥文件：

import java.io.FileOutputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;

public class KeyStoreMigrationExample {

    public static void main(String[] args) throws Exception {
        // 加载源密钥库
        KeyStore sourceKeyStore = KeyStore.getInstance("JKS");
        char[] sourcePassword = "source_keystore_password".toCharArray();
        FileInputStream sourceInputStream = new FileInputStream("source_keystore.jks");
        sourceKeyStore.load(sourceInputStream, sourcePassword);

        // 导出私钥和证书到私钥文件
        char[] privateKeyPassword = "private_key_password".toCharArray();
        PrivateKey privateKey = (PrivateKey) sourceKeyStore.getKey("alias", privateKeyPassword);
        Certificate certificate = sourceKeyStore.getCertificate("alias");

        FileOutputStream privateKeyOutputStream = new FileOutputStream("private_key.pem");
        privateKeyOutputStream.write(privateKey.getEncoded());
        privateKeyOutputStream.close();

        FileOutputStream certificateOutputStream = new FileOutputStream("certificate.pem");
        certificateOutputStream.write(certificate.getEncoded());
        certificateOutputStream.close();

        // 关闭源密钥库输入流
        sourceInputStream.close();
    }
}

2. 将私钥和证书导入到新的密钥库中：

import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;

public class KeyStoreMigrationExample {

    public static void main(String[] args) throws Exception {
        // 加载目标密钥库
        KeyStore targetKeyStore = KeyStore.getInstance("PKCS12");
        char[] targetPassword = "target_keystore_password".toCharArray();
        FileInputStream targetInputStream = new FileInputStream("target_keystore.p12");
        targetKeyStore.load(targetInputStream, targetPassword);

        // 加载私钥和证书
        FileInputStream privateKeyInputStream = new FileInputStream("private_key.pem");
        byte[] privateKeyBytes = new byte[privateKeyInputStream.available()];
        privateKeyInputStream.read(privateKeyBytes);
        privateKeyInputStream.close();

        FileInputStream certificateInputStream = new FileInputStream("certificate.pem");
        byte[] certificateBytes = new byte[certificateInputStream.available()];
        certificateInputStream.read(certificateBytes);
        certificateInputStream.close();

        // 创建私钥和证书的Entry，并将其导入到目标密钥库
        Certificate certificate = CertificateFactory.getInstance("X.509").generateCertificate(new ByteArrayInputStream(certificateBytes));
        PrivateKey privateKey = KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes));

        KeyStore.PrivateKeyEntry privateKeyEntry = new KeyStore.PrivateKeyEntry(privateKey, new Certificate[]{certificate});
        targetKeyStore.setEntry("alias", privateKeyEntry, new KeyStore.PasswordProtection(targetPassword));

        // 保存目标密钥库
        FileOutputStream targetOutputStream = new FileOutputStream("target_keystore.p12");
        targetKeyStore.store(targetOutputStream, targetPassword);
        targetOutputStream.close();

        // 关闭目标密钥库输入流
        targetInputStream.close();
    }
}

这两个示例代码展示了如何从一个密钥库或私钥文件中导出私钥和证书，并将其导入到另一个密钥库中。根据实际情况，你可能需要根据密钥库的类型、密码和别名进行适当的调整。