查看APK包签名的方法。

1、查看 keystore  

$ keytool -list -keystore debug.keystore 

结果：

Keystore type: JKS

Keystore provider: SUN

Your keystore contains 1 entry

androiddebugkey, Mar 21, 2013, PrivateKeyEntry, 

Certificate fingerprint (MD5): E0:F4:90:EE:CD:77:17:0E:B8:C4:AC:64:B2:F6:FC:83

2、查看三方应用或是系统应用签名
用winrar打开待查看的apk，将其中META-INF文件夹解压出来，得到其中的CERT.RSA文件

$ keytool -printcert -file META-INF/CERT.RSA

结果：

 

Owner: CN=Android Debug, O=Android, C=US

Issuer: CN=Android Debug, O=Android, C=US

Serial number: 514ab2e1

Valid from: Thu Mar 21 15:12:33 CST 2013 until: Sat Mar 14 15:12:33 CST 2043

Certificate fingerprints:

MD5:  E0:F4:90:EE:CD:77:17:0E:B8:C4:AC:64:B2:F6:FC:83

SHA1: 7F:E5:11:D8:37:4F:DA:D7:75:EA:A5:8C:47:06:85:95:6D:1D:3F:2B

Signature algorithm name: SHA1withRSA

Version: 3