[tor-bugs] #25381 [Core Tor/Tor]: Add crypto_rand_double_sign() in C and Rust

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#25381: Add crypto_rand_double_sign() in C and Rust
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.4.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, privcount, review-        |  Actual Points:  1
  group-34                                       |
Parent ID:  #23061                               |         Points:  2
 Reviewer:  isis                                 |        Sponsor:
                                                 |  SponsorQ
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Comment (by teor):

 Isis also tells me to make rand a hard dependency.

 I need to:
 * commit Cargo.lock and Cargo.toml
 * cargo vendor the dependency to tor-rust-dependencies (we should have a
 script for this, maybe it's in the instructions)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25381#comment:6>
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