[tor-bugs] #20148 [Core Tor/Tor]: Add AES256 support to crypto_cipher_t

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#20148: Add AES256 support to crypto_cipher_t
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     Reporter:  nickm         |      Owner:  nickm
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:  .2            |  Parent ID:
       Points:  .2            |   Reviewer:
      Sponsor:                |
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 Proposal 224 specifies the use of AES256 for encrypting hidden service
 descriptors.  We need an aes256 backend.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20148>
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