bulletproofs: expose a macro returning proof-size #13
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This PR adds a convenience macro enabling callers to allocate the necessary and sufficient space for an uncompressed rangeproof. In particular, this makes it tractible to avoid pessimistically over-allocating the maximum possible space an uncompressed rangeproof might ever occupy. Also, SECP256K1_BULLETPROOFS_RANGEPROOF_UNCOMPRESSED_MAX_LENGTH_ is redefined as a short-cut leveraging the new convenience macro. This both makes clear from where the maximum length is derived, and should avoid the two macros drifting apart should the expected size change (e.g., if compression is supported in the future).
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ACK that this formula matches the one I implemented in BlockstreamResearch#123 (but apparently did not make it into BlockstreamResearch#108) |
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Cherry-picked onto BlockstreamResearch#108 |
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This PR adds a convenience macro enabling callers to allocate the
necessary and sufficient space for an uncompressed rangeproof. In
particular, this makes it tractible to avoid pessimistically
over-allocating the maximum possible space an uncompressed
rangeproof might ever occupy.
Also, SECP256K1_BULLETPROOFS_RANGEPROOF_UNCOMPRESSED_MAX_LENGTH_ is
redefined as a short-cut leveraging the new convenience macro. This
both makes clear from where the maximum length is derived, and
should avoid the two macros drifting apart should the expected size
change (e.g., if compression is supported in the future).