[tor-bugs] #20671 [Core Tor/Tor]: Refactor stream cipher API

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#20671: Refactor stream cipher API
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     Reporter:  chelseakomlo  |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  refactoring
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 It would be useful to have a symmetric API for stream cipher
 functionality.

 Specifically, functions should have similar signatures, consistent
 success/error retvals, etc.

 As mentioned in #20148, `crypto_cipher_new()`,
 `crypto_cipher_new_with_iv()`, and `crypto_cipher_new_with_bits()` are
 prime targets.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20671>
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