Use BlockCipher.blockSize as a result length in randomIV helper#893

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evnik wants to merge 3 commits intokrzyzanowskim:mainfrom

Commits on Oct 4, 2021

Use `BlockCipher.blockSize` as a result length in `randomIV` helper
evnik
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Commits on Oct 5, 2021

Example of `randomIV` usage is updated
evnik
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Commits on Nov 24, 2021

`randomIV(_ count: Int)` helper is returned and marked as deprecated
evnik
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