java - RSA 加密时遇到 InvalidKeyException

Question

我在尝试使用我的公钥加密时遇到了上述异常。

java.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=111, too big

代码如下:

    public static String encryptWithMyPubKey (String text) throws Exception {
        if (myPubKey == null) {
            URL path = RSAUtils.class.getResource("pub.der");
            System.out.println("Path to private key file" + path.getFile());
            File f = new File(path.getFile());  
            FileInputStream fis = new FileInputStream(f);
            DataInputStream dis = new DataInputStream(fis);
            byte[] keyBytes = new byte[(int)f.length()];
            dis.readFully(keyBytes);
            dis.close();

            KeyFactory.getInstance("RSA").generatePublic(new    X509EncodedKeySpec(keyBytes));
        } 
    }

这是什么意思？

Answer 1

我已经解决了这个问题。这是由于der二进制文件格式错误造成的。将 .der 文件从资源文件夹复制到类路径时，Maven 构建会对 .der 文件应用过滤器。为了保留这些文件，您需要通过更改 pom.xml 来排除 .der 文件(或任何与此相关的二进制文件)，如下所示:

<plugin>
            <artifactId>maven-resources-plugin</artifactId>
            <version>2.6</version>
            <executions>
                <execution>
                    <id>copy-resources</id>
                    <!-- here the phase you need -->
                    <phase>validate</phase>
                    <goals>
                        <goal>copy-resources</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>
                        <resources>
                            <resource>
                                <directory>src/main/java</directory>
                                <filtering>true</filtering>
                                <excludes>
                                    <exclude>**/*.der</exclude>
                                </excludes>
                            </resource>
                            <resource>
                                <directory>src/main/java</directory>
                                <filtering>false</filtering>
                                <includes>
                                    <include>**/*.der</include>
                                </includes>
                            </resource>
                        </resources>
                    </configuration>
                </execution>
            </executions>
        </plugin>