[Xiaomi Redmi 3s ROMs, Kernels, Recoveries, & Other] juliovedovatto:
I'm facing this issue when trying to add item to the keystore...

12-12 12:14:40.221 14616 14616 W KeyStore: KeyStore exception
12-12 12:14:40.221 14616 14616 W KeyStore: android.os.ServiceSpecificException: (code 7)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.os.Parcel.createException(Parcel.java:1964)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.os.Parcel.readException(Parcel.java:1918)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.os.Parcel.readException(Parcel.java:1868)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.security.IKeystoreService$Stub$Proxy.get(IKeystoreService.java:786)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.security.KeyStore.get(KeyStore.java:195)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.security.keystore.AndroidKeyStoreSpi.engineGetCertificateChain(AndroidKeyStoreSpi.java:118)
12-12 12:14:40.221 14616 14616 W KeyStore:	at java.security.KeyStoreSpi.engineGetEntry(KeyStoreSpi.java:484)
12-12 12:14:40.221 14616 14616 W KeyStore:	at java.security.KeyStore.getEntry(KeyStore.java:1560)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.e.d.c.f(SourceFile:191)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.e.d.c.b(SourceFile:138)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.e.d.c.a(SourceFile:63)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.e.c.g.a(SourceFile:49)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.e.a.a(SourceFile:119)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.bbcode.dao.KeysDAO.salvarChave6(SourceFile:156)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.bbcode.dao.KeysDAO.salvarChave(SourceFile:123)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.bbcode.controller.BBCodeService.salvarChave(SourceFile:192)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.bbcode.BBCodeActivity.obtainK1Result(SourceFile:798)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.bbcode.BBCodeActivity.access$400(SourceFile:95)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.bbcode.BBCodeActivity$8$1.actionDone(SourceFile:651)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.codereader.barcode.d.a(SourceFile:347)
12-12 12:14:40.221 14616 14616 W KeyStore:	at br.com.bb.android.codereader.barcode.b.d.handleMessage(SourceFile:109)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.os.Handler.dispatchMessage(Handler.java:106)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.os.Looper.loop(Looper.java:193)
12-12 12:14:40.221 14616 14616 W KeyStore:	at android.app.ActivityThread.main(ActivityThread.java:6718)
12-12 12:14:40.221 14616 14616 W KeyStore:	at java.lang.reflect.Method.invoke(Native Method)
12-12 12:14:40.221 14616 14616 W KeyStore:	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)
12-12 12:14:40.221 14616 14616 W KeyStore:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
12-12 12:14:40.248 431 431 W /vendor/bin/hw/android.hardware.keymaster@3.0-service: Digest 1 requested but not supported by KM1 hal
12-12 12:14:40.251 431 431 W /vendor/bin/hw/android.hardware.keymaster@3.0-service: Digest 1 requested but not supported by KM1 hal

A friend have an Android Pie device (stock rom, non-AOSP) and have no troubles to use this app.

Note: I was using this app with Pixel Experience Oreo rom and it was working fine, until I updated to Pixel Experience Pie version.