不止一次有用到Android签名相关的知识，每次都几乎从零开始在Google上搜索找，不想在继续这样了，找了个时间好好整理了一下自己用到的一些碎片知识，于是乎放到这里，一是备忘，二是帮助别人。
从APK文件中获取签名信息
使用方法
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| keytool -list -printcert -jarfile your_apk_file
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输出信息
- 签名Owner,Issuer等信息
- 签名的fingerprints,如md5及sha1等值
- 签名有效期等信息
示例效果
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| 16:29 $ keytool -list -printcert -jarfile akoi_1.2.apk
Signer #1:
Signature:
Owner: CN=Andrew Wallace, OU=droidyue.com, O=droidyue.com, L=Beijing, ST=Beijing, C=86
Issuer: CN=Andrew Wallace, OU=droidyue.com, O=droidyue.com, L=Beijing, ST=Beijing, C=86
Serial number: 11a8a4a3
Valid from: Tue Feb 10 18:07:43 CST 2015 until: Sun Jun 13 18:07:43 CST 3013
Certificate fingerprints:
MD5: 46:C5:BE:EF:B5:C9:00:E1:FA:42:50:50:57:54:CA:15
SHA1: C1:14:5D:0A:C2:BF:F6:06:43:20:AE:2C:07:12:97:58:C2:1B:39:D1
SHA256: 0E:88:7D:C2:4C:D6:84:A7:58:D4:24:1E:9D:38:F9:05:98:1E:B2:A2:D7:CB:0F:81:74:60:5B:38:89:FF:21:1C
Signature algorithm name: SHA256withRSA
Version: 3
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从签名文件中获取签名信息
使用方法
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| keytool -list -v -keystore your_kestore_file
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注意，上述命令执行后，会提示输入密码，其实输入错误也没有关系，不影响结果。
输出信息
- 签名Owner,Issuer等信息
- 签名的fingerprints,如md5及sha1等值
- 签名有效期等信息
示例效果
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| Keystore type: JKS
Keystore provider: SUN
Your keystore contains 1 entry
Alias name: droidyue.com
Creation date: Feb 10, 2015
Entry type: PrivateKeyEntry
Certificate chain length: 1
Certificate[1]:
Owner: CN=Andrew Wallace, OU=droidyue.com, O=droidyue.com, L=Beijing, ST=Beijing, C=86
Issuer: CN=Andrew Wallace, OU=droidyue.com, O=droidyue.com, L=Beijing, ST=Beijing, C=86
Serial number: 11a8a4a3
Valid from: Tue Feb 10 18:07:43 CST 2015 until: Sun Jun 13 18:07:43 CST 3013
Certificate fingerprints:
MD5: 46:C5:BE:EF:B5:C9:00:E1:FA:42:50:50:57:54:CA:15
SHA1: C1:14:5D:0A:C2:BF:F6:06:43:20:AE:2C:07:12:97:58:C2:1B:39:D1
SHA256: 0E:88:7D:C2:4C:D6:84:A7:58:D4:24:1E:9D:38:F9:05:98:1E:B2:A2:D7:CB:0F:81:74:60:5B:38:89:FF:21:1C
Signature algorithm name: SHA256withRSA
Version: 3
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重新签名APK
在没有源码情况下，我们就能对apk进行更换签名。
脚本
使用方法
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| bash signapk.sh your_apk_file your_keystore_file keystore_pass keystore_alias
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示例效果
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| 16:57 $ bash signapk.sh weixin6313android740.apk ~/Documents/baidu_disk/百度云同步盘/droidapp/mykiki 123456 droidyue.com
param1 weixin6313android740.apk
param2 /Users/androidyue/Documents/droidapp/mykiki
param3 123456
param4 droidyue.com
deleting: META-INF/MANIFEST.MF
deleting: META-INF/DROIDYUE.SF
deleting: META-INF/DROIDYUE.RSA
adding: META-INF/MANIFEST.MF
adding: META-INF/DROIDYUE.SF
adding: META-INF/DROIDYUE.RSA
......
Verification succesful
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生成的文件会放在当前目录，其文件名相对输入文件，增加了signed_前缀，比如对weixin6313android740.apk进行上述操作得到的输出文件是signed_weixin6313android740.apk
Gradle build生成签名APK
想要在执行gradle build时生成指定签名的apk，需要在build.gradle中如下修改
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| android {
signingConfigs {
release {
storeFile file("myrelease.keystore")
storePassword "********"
keyAlias "******"
keyPassword "******"
}
}
buildTypes {
release {
signingConfig signingConfigs.release
}
}
}
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