Precompute sighashes #8524

1. 
   sipa commented at 1:15 pm on August 16, 2016: member

   Alternative to #8422.

   This version simply precomputes the 3 overall hashes once per transaction, resulting in no more cache that needs updating during validation.

2. Precompute sighashes

   Original version by Nicolas Dorier. Precomputing version by Pieter Wuille.

   d2c5d044d0
3. 
   NicolasDorier commented at 1:36 pm on August 16, 2016: contributor

   utACK 67a2091463b7d9f3d33d86fb42a6feab127a9487 will test and time it soon. I prefer this version as well.
4. Unit test for sighash caching ab48c5e721
5. sipa force-pushed on Aug 16, 2016
6. MarcoFalke added the label Needs backport on Aug 16, 2016
7. MarcoFalke added this to the milestone 0.13.1 on Aug 16, 2016
8. 
   instagibbs commented at 1:26 pm on August 22, 2016: member

   Prefer the simplicity of this one.

   code review ACK and lightly tACK(it syncs testnet) https://github.com/bitcoin/bitcoin/pull/8524/commits/ab48c5e72156b34300db4a6521cb3c9969be3937

9. 
   dcousens commented at 1:41 pm on August 22, 2016: contributor

   utACK ab48c5e
10. in src/script/interpreter.h: in ab48c5e721 outdated

     97@@ -98,13 +98,20 @@ enum
     98 
     99 bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
    100 
    101+struct CachedHashes
    

    ---

    ---

    

    laanwj commented at 1:01 pm on August 26, 2016:

    Nit: this struct name is too general, maybe CachedTransactionHashes?

    ---

    

    sipa commented at 4:32 pm on August 26, 2016:

    It’s actually not a cache either anymore.

    What about PrecomputedTransactionData ?

    ---

    

    sipa commented at 4:39 pm on August 26, 2016:

    Added a commit.
11. 
    laanwj commented at 1:19 pm on August 26, 2016: member

    utACK ab48c5e, nice to get rid of some TODOs and spurious hashing
12. sipa force-pushed on Aug 26, 2016
13. Rename to PrecomputedTransactionData 35fe0393f2
14. sipa force-pushed on Aug 26, 2016
15. 
    btcdrak commented at 9:18 am on August 28, 2016: contributor

    utACK 35fe039
16. 
    sipa commented at 12:16 pm on August 28, 2016: member

    @laanwj Ok with the class name now?
17. sipa merged this on Sep 1, 2016
18. sipa closed this on Sep 1, 2016

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19. sipa referenced this in commit 19b0f33de0 on Sep 1, 2016
20. MarcoFalke removed the label Needs backport on Sep 9, 2016
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Contributors
sipa NicolasDorier instagibbs dcousens laanwj btcdrak

Milestone
0.13.1