装载在Java中

Question

一个DSA公钥比方说，我有一个看起来像这样的DSA公钥：我做openssl dsa -in dsa_priv.pem -pubout -out dsa_pub.pem

产生这个关键

-----BEGIN PUBLIC KEY----- 
MIIBuDCCASwGByqGSM44BAEwggEfAoGBAOwYAcAzXpuw+XCXuNp5zhAzKdhrRguI 
uI5kLia8fhRb+1EnFPNpXt4fUS2c/0P0nvzH/TvApizzMkRYJea6rRSW5B+MDjv6 
lvrxv+5xBM15kdug033mgSL7wEJIrTLwbe5/djz2oe+pr1KLqs/fvgyKcQyttUWb 
5SmwZ+UVx3zfAhUAu0kA2L6VgbvEwpD9sTj5tLyB6Y0CgYEA5GjC+KsPsAH3HZKl 
2IwTjX47iNVHyuzr4ZcyXceJ/pi3WR6bQJ6tpf1I2jIE0DOMPlNUwYh0aWBGvoY2 
t4d5cwZaW90OS8IAIRFkQS0ywpmJyb7KXqRHwAYdMID88GW0d/KsVB3if0j/9QOo 
jhGOrO+kJcZBxUSxINgIIEYFAlEDgYUAAoGBALnHTAZlpoLJZuSBVtnMuRM3cSX4 
3IkE9w9FveDV1jX5mmfK7yBVpQFV8eVJfk91ERQ4Dn6ePLUv2dRIt4a0S0qHqadg 
zyoFyqkmmUi1kNLyixtRqh+m2gXx0t63HEpZDbEPppdpnlppZquVQh7TyrKSXW9M 
TzUkQjFI9UY7kZeK 
-----END PUBLIC KEY----- 

我想能够加载这个在Java中的关键，但我不清楚如何。

我会用RSA做的是...我想base64将字符串解码为字节数组，然后将该字节数组传递给org.bouncycastle.asn1.pkcs.RSAPrivateKey.getInstance()。此时，您可以将个人参数传递到java.security.spec.RSAPrivateKeySpec，并从那里做钥匙。

但我该如何做与DSA？据我所知，没有org.bouncycastle.asn1.pkcs.RSAPrivateKey班。下面是我尝试导入时出现的错误：

import org.bouncycastle.asn1.pkcs.DSAPublicKey; 
           ^
    symbol: class DSAPublicKey 
    location: package org.bouncycastle.asn1.pkcs 
1 error 

任何想法？

Answer 1

的充气城堡库包含PEM阅读器将解析你的关键，java.security.interfaces.DSAPublicKey：

PEMReader reader = new PEMReader(new FileReader("id_dsa.pub")); 
DSAPublicKey publicKey = (DSAPublicKey) reader.readObject(); 
// What implementation are we dealing with? 
System.out.println(publicKey.getClass()); 

实现类显然是org.bouncycastle.jce.provider.JDKDSAPublicKey

完整的示例：

import org.bouncycastle.jce.provider.BouncyCastleProvider; 
import org.bouncycastle.openssl.PEMReader; 

import java.io.StringReader; 
import java.security.Security; 
import java.security.interfaces.DSAPublicKey; 

public class DSA { 
    public static void main(String[] args) throws Exception { 
     String key = 
      "-----BEGIN PUBLIC KEY-----\n" + 
      "MIIBuDCCASwGByqGSM44BAEwggEfAoGBAOwYAcAzXpuw+XCXuNp5zhAzKdhrRguI\n" + 
      "uI5kLia8fhRb+1EnFPNpXt4fUS2c/0P0nvzH/TvApizzMkRYJea6rRSW5B+MDjv6\n" + 
      "lvrxv+5xBM15kdug033mgSL7wEJIrTLwbe5/djz2oe+pr1KLqs/fvgyKcQyttUWb\n" + 
      "5SmwZ+UVx3zfAhUAu0kA2L6VgbvEwpD9sTj5tLyB6Y0CgYEA5GjC+KsPsAH3HZKl\n" + 
      "2IwTjX47iNVHyuzr4ZcyXceJ/pi3WR6bQJ6tpf1I2jIE0DOMPlNUwYh0aWBGvoY2\n" + 
      "t4d5cwZaW90OS8IAIRFkQS0ywpmJyb7KXqRHwAYdMID88GW0d/KsVB3if0j/9QOo\n" + 
      "jhGOrO+kJcZBxUSxINgIIEYFAlEDgYUAAoGBALnHTAZlpoLJZuSBVtnMuRM3cSX4\n" + 
      "3IkE9w9FveDV1jX5mmfK7yBVpQFV8eVJfk91ERQ4Dn6ePLUv2dRIt4a0S0qHqadg\n" + 
      "zyoFyqkmmUi1kNLyixtRqh+m2gXx0t63HEpZDbEPppdpnlppZquVQh7TyrKSXW9M\n" + 
      "TzUkQjFI9UY7kZeK\n" + 
      "-----END PUBLIC KEY-----"; 

     Security.addProvider(new BouncyCastleProvider()); 
     PEMReader reader = new PEMReader(new StringReader(key)); 
     DSAPublicKey decoded = (DSAPublicKey) reader.readObject(); 
     System.out.println(decoded.getClass()); 
    } 
}