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element-x-ada/docs/build-logs/phase4b-build-result.md

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Phase 4b - Keystore Fix Result

Date: 2026-03-28 11:35 PDT

Bug Fixed

CardanoKeyStorageImpl.getOrCreateSecretKey() was setting setUserAuthenticationValidityDurationSeconds(-1), which requires BiometricPrompt.CryptoObject for every cipher operation. This threw UserNotAuthenticatedException at runtime when storeMnemonic() or getMnemonic() called cipher.init().

Fix Applied

Changed line 193:

// Before
.setUserAuthenticationValidityDurationSeconds(-1)

// After
.setUserAuthenticationValidityDurationSeconds(30)

This allows the AES key to be used for 30 seconds after any biometric/device credential authentication. Proper BiometricPrompt.CryptoObject flow deferred to Phase 5.

Build Result

BUILD SUCCESSFUL in 43s
3819 actionable tasks: 8 executed, 3811 up-to-date

Commit

c21a3b7c48 fix(wallet): use 30s auth validity window instead of per-use biometric

Pushed to phase1-dev on Gitea.