[Android]使用platform密钥来给apk文件签名的命令

1.使用platform密钥对apk进行签名

1.1.进入<Android_Source_Path>/build/target/product/security,找到【platform.pk8】和【platform.x509.pem】系统密钥。

1.2.进入<Android_Source_Path>/build/tools/signapk找到SignApk.java，运行javac编译成SignApk.class

1.3.执行命令java com.android.signapk.SignApk platform.x509.pem platform.pk8 input.apk output.apk

至此，完成。

2. 对1的补充：

<Android_Source_Path>/build/target/product/security下有多对密钥，详细如下：

The following commands were used to generate the test key pairs:

development/tools/make_key testkey '/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'

development/tools/make_key platform '/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'

development/tools/make_key shared '/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'

development/tools/make_key media '/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'

The following standard test keys are currently included:

testkey -- a generic key for packages that do not otherwise specify a key.

platform -- a test key for packages that are part of the core platform.

shared -- a test key for things that are shared in the home/contacts process.

media -- a test key for packages that are part of the media/download system.

These test keys are used strictly in development, and should never be assumed

to convey any sort of validity. When $BUILD_SECURE=true, the code should not

honor these keys in any context.

signing using the openssl commandline (for boot/system images)

--------------------------------------------------------------

1. convert pk8 format key to pem format

% openssl pkcs8 -inform DER -nocrypt -in testkey.pk8 -out testkey.pem

2. create a signature using the pem format key

% openssl dgst -binary -sha1 -sign testkey.pem FILE > FILE.sig

extracting public keys for embedding

------------------------------------

it's a Java tool

but it generates C code

take a look at commands/recovery/Android.mk

you'll see it running $(HOST_OUT_JAVA_LIBRARIES)/dumpkey.jar

3.对3的补充：

在运行第三步的命令前，请在你当前的工作目录下新建如下结构的文件夹:com.android.signapk，然后将第二步编译生成的SignApk放入该目录下。或者也可以将SignApk.java的package声明删除后再运行javac编译。

命令java com.android.signapk.SignApk platform.x509.pem platform.pk8 input.apk output.apk

不单可以对apk文件进行重签名，也可以对所有的zip文件进行重签名，包括ROM文件。