BIP324: Fix features bitmask for decoding-case selection #1969
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jonatack
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ACK e78b332
cc BIP authors @real-or-random @jonasschnelli @sipa @dhruv for sign-off
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I think that change is correct, but then this PR will also need to update the pregenerated |
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Replace (features & 4) with (features & 3) in the four decoding-case checks. The docstring specifies that the lower two bits (f & 3) select which of x1/x2/x3 are valid. Using (features & 4) limited the value to {0,4}, making cases 1 and 2 unreachable and bypassing proper gating when bit 4 (u >= p) was set. This aligns implementation with the documented behavior and ensures all four modes are exercised correctly.