将字符串私钥转换为PrivateKey类型

内容来源于 Stack Overflow,并遵循CC BY-SA 3.0许可协议进行翻译与使用

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我在字符串格式下使用RSA私钥。

String privatekey = -----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEAqAKCCMKqboM8ywSuNvmf2zuT0e2elxntdEe5msv22jzT89Xa
1Q/V4CeQdZruIw8eTAMa67Dej+3cPdSrjdDnfxcb9L14U9oFPgOyvxVwb+/S8jqm
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-----END RSA PRIVATE KEY-----

我试图使用下面的代码片段将其转换为PrivateKey类型 -

  public PrivateKey generatePrivateKey(String privateKey) throws Exception{

        privateKey = privateKey.replace("-----BEGIN RSA PRIVATE KEY-----", "");
        privateKey = privateKey.replace("-----END RSA PRIVATE KEY-----", "");
        privateKey = privateKey.replaceAll("\\s+", "");
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey.getBytes());
        KeyFactory kf = KeyFactory.getInstance("RSA");
        return kf.generatePrivate(keySpec);
    }

我收到以下错误 -

它给我一个关于generatePrivate方法的错误。

Execution exception[[InvalidKeySpecException: java.security.InvalidKeyException: invalid key format]]
提问于
用户回答回答于

BEGIN RSA PRIVATE KEY意味着你的密钥是pkcs#1格式而不是pkcs#8。Java本身不支持读取pkcs#1密钥。您需要使用bouncycastle库(请参阅JAVA中的读取格式PKCS1的RSA私钥)或使用以下任何解决方案从PEM BASE64获取RSA私钥编码的私钥文件

如果你的密钥是pkcs#8,它将有标题BEGIN PRIVATE KEY。在这种情况下,为了使代码正常工作,您需要另外解码base64中的密钥内容

要将pkcs#1密钥转换为pkcs#8,您可以使用openssl

  openssl pkcs8 -topk8 -inform PEM -outform PEM -nocrypt -in pkcs1.key -out pkcs8.key

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