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When publishing an application or a custom rom  you need to sign the .apk or .zip files with a certificate using a private key. The Android system uses the certificate to identify the author of an application and establish trust relationship between applications. The classic way of doing this was to use keytool then sign it with  jarsigner. In this tutorial i’ll explain an alternative method which is relatively easy to use for most people using a tool called SignApk.jar.

• Download SignApk.rar from link given above
• Extract it  anywhere on your drive (eg. c:SignApk)
• If you don’t have java installed, download and install it.
• Copy certificate.pem and key.pk8 into your extracted SignApk directory
• Within SignApk directory type:
java -jar signapk.jar certificate.pem key.pk8 your-app.apk  your-signed-app.apk OR java -jar signapk.jar certificate.pem key.pk8 your-update.zip your-signed-update.zip

Note:
If you don’t want to create your own public/private key pair, you can use test key included in SignApk.zip.

signapk.zip [8,72 Kb] (Downloads: 349)