Fix panic when unsealing a value too short for a crypto box (#217) #641

Job	Run time
Run checks (ubuntu-latest)	28s
Run checks (macos-latest)	58s
Run checks (windows-latest)	1m 31s
Build library (Android) (aarch64-linux-android)	5m 55s
Run tests (ubuntu-latest)	3m 10s
Build library (Android) (armv7-linux-androideabi)	5m 59s
Build library (iOS) (aarch64-apple-ios)	7m 55s
Build library (linux-aarch64, ubuntu-latest, libaries_askar.so, aarch64-unknown-linux-gnu, true)	3m 37s
Run tests (macos-latest)	3m 58s
Build library (Android) (i686-linux-android)	5m 57s
Build library (iOS) (aarch64-apple-ios-sim)	1m 15s
Build library (linux-x86_64, ubuntu-latest, libaries_askar.so, x86_64-unknown-linux-gnu, true)	3m 40s
Run tests (windows-latest)	4m 50s
Build library (Android) (x86_64-linux-android)	5m 48s
Build library (iOS) (x86_64-apple-ios)	7m 41s
Build library (darwin-universal, macos-latest, libaries_askar.dylib, darwin-universal, beta)	7m 20s
Build library (windows-x86_64, windows-latest, aries_askar.dll, x86_64-pc-windows-msvc)	4m 45s
Create library (Android)	8s
Build and test Python wrapper (linux-aarch64, 3.8)	21s
Build and test Python wrapper (linux-x86_64, 3.8)	25s
Build and test JavaScript wrapper	1m 1s
Build and test Python wrapper (darwin-universal, 3.8)	27s
Build and test Python wrapper (windows-x86_64, 3.8)	49s
Create iOS xcframework	0s
Create iOS and Android release assets	0s
Successful build	1s
	1h 17m 59s

Provide feedback