我正在开发我的Android应用程序。我正在尝试从我的证书文件流生成 X509Certificate 实例,但获取CertificateException
,这是我的简单代码:
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
...
public class CertMgr {
//my certification file 'mycert.p12' located in my app internal storage
File certFile = GET_CERT();
X509Certificate cert = null;
try {
FileInputStream fis = new FileInputStream(certFile);
BufferedInputStream bis = new BufferedInputStream(fis);
CertificateFactory cf = CertificateFactory.getInstance("X.509");
if(bis.available() > 0){
//I got CertificateException here, see the stack trace
cert = (X509Certificate) cf.generateCertificate(bis); //line nr 150
}
}catch(...)
{...}
...
}
堆栈跟踪:
javax.security.cert.CertificateException: org.apache.harmony.security.asn1.ASN1Exception: ASN.1 Sequence: mandatory value is missing at [4]
11-11 17:30:20.731: W/System.err(11529): at javax.security.cert.X509Certificate.getInstance(X509Certificate.java:94)
11-11 17:30:20.731: W/System.err(11529): at javax.security.cert.X509Certificate.getInstance(X509Certificate.java:213)
11-11 17:30:20.731: W/System.err(11529): at com.my.app.CertMgr.getCert(CertMgr.java:150)
有人可以向我解释为什么我会得到这个例外吗?
P.S。:以下是我在Android SDK中使用的课程X509Certificate,CertificateFactory
如果您对我这样做的原因感到好奇,原因是我希望我的应用能够通过以下代码安装证书( mycert.p12 )(如果上面的代码是工作正常):
Intent installIntent = KeyChain.createInstallIntent();
installIntent.putExtra(KeyChain.EXTRA_CERTIFICATE, cert.getEncoded());
installIntent.putExtra(KeyChain.EXTRA_NAME, MY_CERT);
startActivityForResult(installIntent, INSTALL_KEYCHAIN_CODE);
答案 0 :(得分:4)
您正在尝试读取PKCS#12数据结构,因为它是X509证书。 PKCS#12标准指定了一个数据结构,它可以捆绑多个证书和私钥,可选择受密码保护。
要读取PKCS#12数据,您需要使用KeyStore加载它。此代码段显示如何列出PCKS#12文件的所有条目:
KeyStore keyStore = KeyStore.getInstance("PKCS12");
File p12File = GET_CERT();
FileInputStream fis = new FileInputStream(p12File);
BufferedInputStream bis = new BufferedInputStream(fis);
keyStore.load(bis, password.toCharArray()); // password is the PKCS#12 password. If there is no password, just pass null
Enumeration<String> aliases = keyStore.aliases();
while (aliases.hasMoreElements()) {
String alias = aliases.nextElement();
/* Do something with the keystore entry */
}
KeyStore条目可以是私钥,具有或不具有关联的证书链(即,从根证书到对应于私钥的证书的证书序列),或者是可信证书。您可以按KeyStore.isKeyEntry
和KeyStore.isCertificateEntry
方法确定条目类型。
根据您提供的KeyChain意图,您似乎希望在密钥链中添加新的受信任的根CA证书。因此,我认为您应该列出PKCS#12文件的证书条目。
编辑(2013年12月12日)
如何从密钥库获取可信证书:
String alias = aliases.nextElement();
if (keyStore.isCertificateEntry(alias)) { // keep only trusted cert entries
Certificate caCert = keyStore.getCertificate(alias)
byte[] extraCertificate = caCert.getEncoded();
Intent installIntent = KeyChain.createInstallIntent();
installIntent.putExtra(KeyChain.EXTRA_CERTIFICATE, extraCertificate);
installIntent.putExtra(KeyChain.EXTRA_NAME, MY_CERT);
startActivityForResult(installIntent, INSTALL_KEYCHAIN_CODE);
}