如何根据APK文件获取应用程序签名时间

问题描述：

我正在分析一个用于检测恶意软件应用程序的APK文件的项目，我想知道如何提取签名时间而不是包装时间。这是我从一篇论文中读到的一个功能，它似乎有意思。如何根据APK文件获取应用程序签名时间

[确定从APK签名证书（https://stackoverflow.com/a/24225807/608639）。一旦你有了证书，我相信你可以做一些事情，比如抽出时间。 – jww

答

至少有三种方法可以获得像签名时间这样的东西。有第一种是使用keytool：

$ keytool -printcert -jarfile sample.apk 
Signer #1: 

Signature: 

Owner: CN=GService inc, OU=G Service inc, O=G, L=New York, ST=New York, C=US 
Issuer: CN=GService inc, OU=G Service inc, O=G, L=New York, ST=New York, C=US 
Serial number: 6f30f864 
Valid from: Thu Dec 17 04:12:27 PST 2015 until: Wed Dec 12 04:12:27 PST 2035 
Certificate fingerprints: 
    MD5: 4D:36:65:14:59:5B:74:8F:2C:9D:92:30:F6:1D:90:8A 
    SHA1: A8:85:7B:72:4C:EE:55:83:09:D5:AC:5D:1A:02:80:C5:F6:83:2B:40 
    SHA256: 04:A7:24:9F:35:D5:8D:7E:F6:0F:73:81:35:5D:23:16:0D:FC:EA:61:C4:15:61:CC:06:8D:36:D9:C6:55:12:B7 
    Signature algorithm name: SHA256withRSA 
    Version: 3 

Extensions: 

#1: ObjectId: 2.5.29.14 Criticality=false 
SubjectKeyIdentifier [ 
KeyIdentifier [ 
0000: C1 C5 19 32 72 47 46 C5 01 CC 4B AF 12 40 3D D2 [email protected]=. 
0010: B5 52 45 5E          .RE^ 
] 
]

这可以让你的证书已经创建了可能的时间：Thu Dec 17 04:12:27 PST 2015。

二是使用jarsigner：

$ jarsigner -verify -verbose sample.apk 

sm  4284 Wed Apr 13 11:03:18 PDT 2016 AndroidManifest.xml 
sm  9193 Wed Apr 13 11:03:18 PDT 2016 res/drawable-hdpi-v4/ic_launcher.png 
sm  5057 Wed Apr 13 11:03:18 PDT 2016 res/drawable-mdpi-v4/ic_launcher.png 
sm  14068 Wed Apr 13 11:03:18 PDT 2016 res/drawable-xhdpi-v4/ic_launcher.png 
sm  1408 Wed Apr 13 11:03:18 PDT 2016 resources.arsc 
sm  20388 Wed Apr 13 11:03:18 PDT 2016 classes.dex 
s  523 Wed Apr 13 11:03:18 PDT 2016 META-INF/MANIFEST.MF 
     576 Wed Apr 13 11:03:18 PDT 2016 META-INF/CERT.SF 
     1368 Wed Apr 13 11:03:18 PDT 2016 META-INF/CERT.RSA 

    s = signature was verified 
    m = entry is listed in manifest 
    k = at least one certificate was found in keystore 
    i = at least one certificate was found in identity scope

这让你似乎是在APK中的所有条目的最后修改时间。他们在这个APK中都是一样的，但他们有时会有所不同。所有最后修改时间可能必须大于“有效期”的日期。

第三个选项是用Java编程方式使用JarFile：

private static void printCertInfo(String jarPath) throws Exception { 
    // verify = true is key here 
    JarFile apkFile = new JarFile(jarPath, true); 
    JarEntry androidManifestEntry = apkFile.getJarEntry("AndroidManifest.xml"); 
    if (androidManifestEntry == null) { 
     System.err.println("APK has no AndroidManifest.xml"); 
     System.exit(-1); 
    } 

    // Need to fully read stream to verify cert 
    System.out.println("Android manifest probably signed: " + androidManifestEntry.getLastModifiedTime()); 

    ByteStreams.copy(apkFile.getInputStream(androidManifestEntry), ByteStreams.nullOutputStream()); 
    // Assuming only signed with a single cert (not always true, but you get the idea) 
    X509Certificate cert = (X509Certificate) androidManifestEntry.getCertificates()[0]; 
    System.out.println("Android manifest cert probably created: " + cert.getNotBefore()); 
    System.out.println("Full cert: " + cert.toString()); 
}

你可能会认为你可以使用androidManifestEntry.getCodeSigners()[0].getTimestamp()但它总是null，我不知道它是什么。上面的代码给出了这样的输出：

Android manifest probably signed: 2016-04-13T18:03:18Z 
Android manifest cert probably created: Thu Dec 17 04:12:27 PST 2015 
Full cert: [ 
[ 
    Version: V3 
    Subject: CN=GService inc, OU=G Service inc, O=G, L=New York, ST=New York, C=US 
    Signature Algorithm: SHA256withRSA, OID = 1.2.840.113549.1.1.11 

    // ** SNIP -- you get the idea **

如何根据APK文件获取应用程序签名时间

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