Resign apk with different keystore

Question

Currently I'm getting the apk signed with the private keystore file but I want to sign that apk with different keystore file. How can I resign that apk..?

Answer 1

You can resign your apk with different keystore.

Follow these steps:

Signing for release: $1.apk -> $1_release.apk"

Step 1: Removing any previous signing

• Change the extension of your .apk to .zip.
• Open and delete the folder META-INF
• Change the extension to .apk
  Or
  Command: zip [originalapk]
  Example: zip "$1".apk -d
  

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Step 2: Signing with release.keystore:

Command:

jarsigner –verbose –keystore [keystorefile] –signedjar [unalignedapk] [originalapk] alias_name

Example:

C:\Program Files\Java\jdk1.6.0_43\bin> jarsigner -verbose -keystore release.keystore -signedjar "$1"_unaligned.apk "$1".apk release

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Step 3: Aligning

Command: zipalign -f 4 [unalignedapk] [releaseapk]

Example:

C:\Users\Downloads\adt-bundle-windows-x86\adt-bundle-windows-x86\sdk\too ls>zipalign -f 4 "$1"_unaligned.apk "$1"_release.apk

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Step 4: Cleaning up

Command: rm 4 [unalignedapk]
Example: rm "$1"_unaligned.apk

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Additional Commands might help:

1. To generate new key with keytool

keytool -genkey -alias  -keystore  

1. To list keys

keytool -list -keystore 

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Note:

To sign our apks we have downgraded JDK from 1.7 to 1.6.0_43 update.

Reason:

As of JDK 7, the default signing algorithim has changed, requiring you to specify the signature and digest algorithims (-sigalg and -digestalg) when you sign an APK.

Command:

jarsigner -verbose -sigalg MD5withRSA -digestalg SHA1 -keystore [keystorefile] [originalapk] alias_name