如何在Android本機C中獲取APK簽名簽名？

Question

我需要在本地C代碼中獲取應用程序簽名簽名以檢查Apk簽名以達到安全目的。

Answer 1

經過多次研究，我達到了這個代碼，可以得到簽名& IssuerDN。

JNIEXPORT void JNICALL 
Java_org_telegram_messenger_ApplicationLoader_st(JNIEnv *env, jobject obj) 
{ 
    jclass cls = (*env)->GetObjectClass(env, obj); 
    jmethodID mid = (*env)->GetMethodID(env, cls,"getPackageManager" ,"()Landroid/content/pm/PackageManager;"); 
    jobject packageManager = (*env)->CallObjectMethod(env, obj, mid); 

    // this.getPackageName() 
    mid = (*env)->GetMethodID(env, cls, "getPackageName", "()Ljava/lang/String;");// 
    jstring packageName = (jstring) (*env)->CallObjectMethod(env, obj, mid); 

    // packageManager->getPackageInfo(packageName, GET_SIGNATURES); 
    cls = (*env)->GetObjectClass(env, packageManager); 
    mid = (*env)->GetMethodID(env, cls, "getPackageInfo", "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;"); 
    jint flags = 0x00000040; 
    jobject packageInfo = (*env)->CallObjectMethod(env, packageManager, mid, packageName, flags); 

    // packageInfo->signatures 
    cls = (*env)->GetObjectClass(env, packageInfo); 
    jfieldID fid = (*env)->GetFieldID(env, cls, "signatures", "[Landroid/content/pm/Signature;"); 
    jobject signatures = (*env)->GetObjectField(env, packageInfo, fid); 

    // signatures[0] 
    jobject signature = (*env)->GetObjectArrayElement(env, signatures, 0); 

    // signature->toByteArray() 
    cls = (*env)->GetObjectClass(env, signature); 
    mid = (*env)->GetMethodID(env, cls, "toByteArray", "()[B"); 
    jbyteArray appSig = (*env)->CallObjectMethod(env, signature, mid); 

    // X509Certificate appCertificate = X509Certificate.getInstance(appSignature.toByteArray()); 
    cls = (*env)->FindClass(env,"javax/security/cert/X509Certificate"); 
    if(cls !=0) { 
     int mid_static = (*env)->GetStaticMethodID(env, cls, "getInstance", "([B)Ljavax/security/cert/X509Certificate;"); 
     if (mid_static != 0) { 
      jobject cerObj = (jstring) (*env)->CallStaticObjectMethod(env, cls, mid_static,appSig);// 
      jclass tmpCls = (*env)->GetObjectClass(env, cerObj); 
      jmethodID mid = (*env)->GetMethodID(env, tmpCls, "getIssuerDN","()Ljava/security/Principal;");    

      //Principal tmpObj = appCertificate.getIssuerDN(); 
      jobject tmpObj = (*env)->CallObjectMethod(env, cerObj, mid); 

      cls = (*env)->GetObjectClass(env, tmpObj); 
      int mid2 = (*env)->GetMethodID(env, cls, "toString", "()Ljava/lang/String;"); 
      jstring ow = (jstring) (*env)->CallObjectMethod(env, tmpObj, mid2);//get app Owner 

      const char *tmpOW = (*env)->GetStringUTFChars(env, ow, 0);   
     } 
    } 
} 

Answer 2

退房this GitHub鏈接。這是迄今爲止我所得到的最佳解決方案。它爲我工作。它返回一個App的簽名。

JNIEXPORT jstring JNICALL Java_com_example_gist_SignatureChecker_getKey(JNIEnv* env, jobject thizz, jobject thiz) 
{ 

// context 
jclass native_context = env->GetObjectClass(thiz); 

// context.getPackageManager() 
jmethodID methodID_func = env->GetMethodID(native_context, "getPackageManager", "()Landroid/content/pm/PackageManager;"); 
jobject package_manager = env->CallObjectMethod(thiz,methodID_func); 
jclass pm_clazz = env->GetObjectClass(package_manager); 

//packageManager.getPackageInfo() 
jmethodID methodId_pm = env->GetMethodID(pm_clazz,"getPackageInfo (Ljava/lang/String;I)Landroid/content/pm/PackageInfo;"); 

//context.getPackageName() 
jmethodID methodID_packagename = env->GetMethodID(native_context,"getPackageName","()Ljava/lang/String;"); 
jstring name_str = static_cast<jstring>(env->CallObjectMethod(thiz,methodID_packagename)); 
jobject package_info = env->CallObjectMethod(package_manager,methodId_pm,name_str,64); 
jclass pi_clazz = env->GetObjectClass(package_info); 

//packageInfo.signatures 
jfieldID fieldID_signatures = env->GetFieldID(pi_clazz,"signatures","[Landroid/content/pm/Signature;"); 
jobject signatur = env->GetObjectField(package_info,fieldID_signatures); 
jobjectArray signatures = reinterpret_cast<jobjectArray>(signatur); 

//signatures[0] 
jobject signature = env->GetObjectArrayElement(signatures,0); 
jclass s_clazz = env->GetObjectClass(signature); 

//signatures[0].toCharString() 
jmethodID methodId_ts = env->GetMethodID(s_clazz,"toCharsString","()Ljava/lang/String;"); 
jobject ts = env->CallObjectMethod(signature,methodId_ts); 

//return signature 
return reinterpret_cast<jstring>(ts); 
}