Olaoluwa Osuntokun 98cae74275 BIP0143+txscript: add segwit sighash, signing, and HashCache integration ...

This commit implements most of BIP0143 by adding logic to implement the
new sighash calculation, signing, and additionally introduces the
HashCache optimization which eliminates the O(N^2) computational
complexity for the SIGHASH_ALL sighash type.

The HashCache struct is the equivalent to the existing SigCache struct,
but for caching the reusable midstate for transactions which are
spending segwitty outputs.

2017-08-13 23:17:40 -05:00

5.9 KiB

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