Make sure that the secretKey has some minimum security properties

[codecov-commenter]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.10 :warning:

Comparison is base (014bf46) 74.92% compared to head (61098ec) 74.83%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #329 +/- ## ========================================== - Coverage 74.92% 74.83% -0.10% ========================================== Files 43 44 +1 Lines 4897 4935 +38 ========================================== + Hits 3669 3693 +24 - Misses 985 994 +9 - Partials 243 248 +5 ``` | [Impacted Files](https://app.codecov.io/gh/komuw/ong/pull/329?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu) | Coverage Δ | | |---|---|---| | [middleware/middleware.go](https://app.codecov.io/gh/komuw/ong/pull/329?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-bWlkZGxld2FyZS9taWRkbGV3YXJlLmdv) | `99.09% <0.00%> (-0.91%)` | :arrow_down: | | [internal/key/key.go](https://app.codecov.io/gh/komuw/ong/pull/329?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwva2V5L2tleS5nbw==) | `66.66% <66.66%> (ø)` | | | [cry/enc.go](https://app.codecov.io/gh/komuw/ong/pull/329?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-Y3J5L2VuYy5nbw==) | `74.39% <100.00%> (ø)` | |

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