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zk-token-sdk: use constant-time msm for inner product proof generation #27355
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…n (backport #27355) (#27489) zk-token-sdk: use constant-time msm for inner product proof generation (#27355) (cherry picked from commit 19fc4fc) Co-authored-by: samkim-crypto <[email protected]>
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Problem
Currently, non-constant time multiscalar multiplication
VartimeMultiscalarMulis used for inner product proof generation/verification for range proof. This is fine for range proof verification since verification is public, but this could theoretically result in a security vulnerability for proof generation.Summary of Changes
Use
MultiscalarMulas opposed toVartimeMultiscalarMulfor inner product proof generation.