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Apk signature tool
After decompiling and modifying apk, the repackaged apk needs to be signed.

Key generation tool -Keytool

Path: JDK/bin/keytool.exe.

Generate key: keytool-genkeypair-keystoretest.keystore-alias test-validity10-keyalg RSA.

Where -validity specifies the number of valid days and -keyalg specifies the algorithm.

Check the key information: keytool-list-v-keystoretest.keystore.

JDK signature tool -jarsigner

Only V 1 signatures are supported.

Path: JDK/bin/jarsigner.exe.

Command: jarsigner-keystoretest.keystoretest.apktestkey.

Apk signature tool -apksigner

By default, the signatures of V 1 and V2 are turned on.

Path: androidsdk/build-tools/28.0.0/apksigner.bat.

Command: apk signer sign-ksxx.keystore-ks-key-alias test key test.apk.