SignApk for .NET is a port of the Android project's SignApk tool that is used to sign .apk files before publishing. It's written in C#. It uses the built in System.Security assembly as well as the external SharpZipLib library.

Certificates

Unlike the Java implementation, this implementation uses PKCS #12 certificate files. You can easily convert a key and certificate created by OpenSSL.

openssl pkcs12 -export -in certificate.pem -inkey key.pem -out key.p12

CLI Usage

signapk [-w] certificate.p12 password input.apk output.apk

Programmatic Usage

void SignPackage(Stream input, X509Certificate2 certificate, Stream output, bool signWholeFile)