OTA升级提示E:signature verification failed签名失败

制作差分包的命令：./build/tools/releasetools/ota_from_target_files -k -i old.zip new.zip update.zip

    那么我们如何选择key_path呢？我们在/build/target/product/security/目录下面有很多key文件，那么我们该选择呢？这里MTK平台是由相应的规则的，如下：

我们去查看ProjectConfig.mk中相对应的宏，根据相关宏的值来决定

•      如果MTK_SIGNATURE_CUSTOMIZATION=yes并且MTK_INTERNAL=no，
•           选择build/target/product/security/[Project]/releasekey
•  
•      如果MTK_SIGNATURE_CUSTOMIZATION=yes并且MTK_INTERNAL=yes，
•          选择 build/target/product/security/common/releasekey
•  
•      如果MTK_SIGNATURE_CUSTOMIZATION=no
•          选择build/target/product/security/testkey

参考log信息：

I:Finding update package...

I:Update location: /sdcard/dload/update.zip

I:Opening update package...

I:read key e=65537 hash=20

I:1 key(s) loaded from /res/keys

I:Verifying update package...

I:comment is 1738 bytes; signature 1720 bytes from end

I:failed to verify against key 0

E:failed to verify whole-file signature

I:verify_file returned 1

E:signature verification failed

Installation aborted.