android 公钥pem编码,在Android中将PEM转换为PublicKey
时间: 2024-03-09 20:44:44 浏览: 17
您可以使用以下代码将PEM格式的公钥转换为PublicKey对象:
```java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;
import javax.security.cert.CertificateException;
import javax.security.cert.X509Certificate;
public class PEMUtils {
/**
* 将PEM格式的公钥转换为PublicKey对象
*
* @param pemString PEM格式的公钥字符串
* @return PublicKey对象
*/
public static PublicKey getPublicKeyFromPem(String pemString) throws Exception {
// 移除PEM文件头和尾部
pemString = pemString.replace("-----BEGIN PUBLIC KEY-----\n", "");
pemString = pemString.replace("\n-----END PUBLIC KEY-----", "");
// 解码PEM字符串
byte[] encoded = android.util.Base64.decode(pemString, android.util.Base64.DEFAULT);
// 创建X.509证书对象
X509Certificate cert = X509Certificate.getInstance(encoded);
// 获取公钥
return cert.getPublicKey();
}
}
```
示例用法:
```java
String pemString = "-----BEGIN PUBLIC KEY-----\n" +
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx5tZzZiJgZvVZ6ZL9gqJ\n" +
"e4tJ1OoebVzUWjDQ2e0J4y0dHkUQv9gJmnzrGdGyj6HKKkOd1gIe0yN6+eagjE4x\n" +
"L3zGzQq2fZLcg8lNp8fFzg3jv3sk5J+qzjYtVnWm1PdC+MIqJgOeVrXGxN4m6J5A\n" +
"P5q8LdQYkzrFf0zrP2yQ3lmqLXH9BJU4l+Jj/3RvHJztg8sFy3CjzZ5ZQ5aKuUJ8\n" +
"xitq8aXHdP6RBsFqjVvY4R5fk5+YI/lxLpJgUJvz8IYqW4ZbVFq6fP5QkUvXJk4q\n" +
"1Xm2B0W2uJMWfKJ3e9QmG6wG5NwqfGvF3d4B9/oxnfK1fZS+3W4sV5nKK7dDyEaQ\n" +
"IQIDAQAB\n" +
"-----END PUBLIC KEY-----\n";
PublicKey publicKey = PEMUtils.getPublicKeyFromPem(pemString);
```
请注意,此示例代码中使用了Android自带的Base64编码解码方法,您还需要导入`java.security.cert.X509Certificate`类和`javax.security.cert.CertificateException`异常。