20 lines
No EOL
653 B
Text
20 lines
No EOL
653 B
Text
import "hashes/pedersen/512bit" as hash;
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import "hashes/utils/256bitsDirectionHelper" as multiplex;
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const u32 DEPTH = 3;
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// Merke-Tree inclusion proof for tree depth 4 using SNARK-efficient pedersen hashes
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// directionSelector => true if current digest is on the rhs of the hash
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def main(u32[8] root, private u32[8] leaf, private bool[DEPTH] directionSelector, private u32[DEPTH][8] path) -> bool {
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// Start from the leaf
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u32[8] digest = leaf;
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// Loop up the tree
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for u32 i in 0..DEPTH {
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u32[16] preimage = multiplex(directionSelector[i], digest, path[i]);
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digest = hash(preimage);
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}
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return digest == root;
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} |