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chore: add jmtspec proof spec definition to go impl #388

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chore: add jmtspec proof spec definition to go impl #388

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22 changes: 22 additions & 0 deletions go/proof.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,28 @@ var SmtSpec = &ProofSpec{
PrehashKeyBeforeComparison: true,
}

// JmtSpec constrains the format for JMT proofs (as implemented by https://github.com/penumbra-zone/jmt)
var JmtSpec = &ProofSpec{
LeafSpec: &LeafOp{
Hash: HashOp_SHA256,
PrehashKey: HashOp_SHA256,
PrehashValue: HashOp_SHA256,
Length: LengthOp_NO_PREFIX,
Prefix: []byte("JMT::LeafNode"),
},
InnerSpec: &InnerSpec{
Hash: HashOp_SHA256,
ChildOrder: []int32{0, 1},
MinPrefixLength: 16,
MaxPrefixLength: 16,
ChildSize: 32,
EmptyChild: []byte("SPARSE_MERKLE_PLACEHOLDER_HASH__"),
},
MinDepth: 0,
MaxDepth: 64,
PrehashKeyBeforeComparison: true,
}

func encodeVarintProto(l int) []byte {
// avoid multiple allocs for normal case
res := make([]byte, 0, 8)
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