android 获取签名信息

/**

* 获取签值信息

* @author allen

* @version 2013-8-27 下午4:15:04

* @return

*/

public static void getSingInfo() {      

 

try {  

         PackageManager manager=BankApp.getApp().getPackageManager()

         PackageInfo packageInfo=manager.getPackageInfo(BankApp.getApp().getPackageName(),                          PackageManager.GET_SIGNATURES);

         Signature[] signs = packageInfo.signatures;      

         Signature sign = signs[0];         

         return parseSignature(sign.toByteArray()); 

} catch (Exception e) {        

        e.printStackTrace();     

        return null;

}   

}

 

 

 

 

public static String parseSignature(byte[] signature) {  

 

try {            

           CertificateFactory certFactory = CertificateFactory.getInstance("X.509");  

           X509Certificate cert = (X509Certificate) certFactory.generateCertificate(new                                                   ByteArrayInputStream(signature));      

           String pubKey = cert.getPublicKey().toString();       

           String signNumber = cert.getSerialNumber().toString();       

       System.out.println("signName:" + cert.getSigAlgName());  

System.out.println("pubKey:" + pubKey);     
System.out.println("signNumber:" + signNumber);            
System.out.println("subjectDN:"+cert.getSubjectDN().toString()); 

} catch (CertificateException e) {         

          e.printStackTrace();      

          return null;

}  

 

}

 

获取到以上信息可以用来做签名比对。

 

非android环境下获取签名信息：

 

private static char[] toChars(byte[] mSignature) {

   byte[] sig = mSignature;

   final int N = sig.length;

   final int N2 = N*2;

   char[] text = new char[N2];

   

   for(int j=0;j<N;j++){

    byte v = sig[j];

    int d = (v>>4)&0xf;

    text[j*2] = (char)(d >= 10 ? ('a' + d - 10) : ('0' + d));

    d = v&0xf;

    text[j*2+1] = (char)(d >= 10 ? ('a' + d - 10) : ('0' + d));

   }

   return text;

}

 

private static java.security.cert.Certificate[] loadCertificates(JarFile jarFile, JarEntry je, byte[] readBuffer) {

try {

InputStream is = jarFile.getInputStream(je);

while(is.read(readBuffer,0,readBuffer.length)!=-1) {

 

}

is.close();

return (java.security.cert.Certificate[])(je!=null?je.getCertificates():null);

} catch (Exception e) {

e.printStackTrace();

System.err.println("Exception reading "+je.getName()+" in "+jarFile.getName()+": "+e);

}

return null;

}

 

public static String getApkSignInfo(String apkFilePath){

byte[] readBuffer = new byte[8192];

java.security.cert.Certificate[] certs = null;

try{

JarFile jarFile = new JarFile(apkFilePath);

Enumeration entries = jarFile.entries();

while(entries.hasMoreElements()){

JarEntry je = (JarEntry)entries.nextElement();

   if(je.isDirectory()){

       continue;

   }

   if(je.getName().startsWith("META-INF/")){

    continue;

   }

   java.security.cert.Certificate[] localCerts = loadCertificates(jarFile,je,readBuffer);

   System.out.println("File " + apkFilePath + " entry " + je.getName()+ ": certs=" + certs + " ("+ (certs != null ? certs.length : 0) + ")");

   if (certs == null) {

   certs = localCerts;

}else{

for(int i=0; i<certs.length; i++){

   boolean found = false;

   for (int j = 0; j < localCerts.length; j++) {

    if (certs[i] != null && certs[i].equals(localCerts[j])) {

     found = true;

     break;

       }

   }

   if (!found || certs.length != localCerts.length) {

     jarFile.close();

     return null;

   }

}

}

}

jarFile.close();

return new String(toChars(certs[0].getEncoded()));

}catch(Exception e){

e.printStackTrace();

}

return null;

}