Make transparent signatures commit to all input amounts & scripts.#472
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Codecov Report
@@ Coverage Diff @@
## master #472 +/- ##
==========================================
+ Coverage 50.20% 50.57% +0.37%
==========================================
Files 88 88
Lines 7962 8002 +40
==========================================
+ Hits 3997 4047 +50
+ Misses 3965 3955 -10
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I have not checked the test data changes.
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https://github.com/zcash/librustzcash/pull/472/files/c66bb892baf7e54437be7341c163f40909a64b43#r785116088 (the incorrect comment in sighash_v5::transparent_sig_digest) is blocking.
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The refactoring of array hashing needed a rustfmt, sorry about that. |
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Transparent UTXOs are referred as pair of previous txid and index. In order to verify UTXO's amount in HWW (hardware wallet), whole previous transaction containing this UTXO must be streamed into the device. This increases complexity of signing process significantly. zcash/zips#574 identifies this problem and suggests a modification to ZIP-244 to resolve this issue, by adding three new fields to section S.2 of the signature hash.
Co-authored-by: Daira Hopwood <daira@jacaranda.org>
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This implements the changes to ZIP 244 sighash rules specified in zcash/zips#577 .
Transparent UTXOs are referred to as a pair of previous txid and index. In order to verify a UTXO's amount, e.g. in a hardware wallet, under the previous rules the whole previous transaction containing this UTXO would have needed to be streamed into the device. This would have increased the complexity of signing process significantly, but is not necessary under the new rules.
Fixes #473