65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
package commitment
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import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/ibc/23-commitment/exported"
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"github.com/cosmos/cosmos-sdk/x/ibc/23-commitment/types"
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)
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// CalculateRoot returns the application Hash at the curretn block height as a commitment
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// root for proof verification.
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func CalculateRoot(ctx sdk.Context) exported.Root {
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return types.NewMerkleRoot(ctx.BlockHeader().AppHash)
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}
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// BatchVerifyMembership verifies a proof that many paths have been set to
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// specific values in a commitment. It calls the proof's VerifyMembership method
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// with the calculated root and the provided paths.
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// Returns false on the first failed membership verification.
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func BatchVerifyMembership(
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ctx sdk.Context,
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proof exported.Proof,
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prefix exported.Prefix,
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items map[string][]byte,
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) error {
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root := CalculateRoot(ctx)
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for pathStr, value := range items {
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path, err := types.ApplyPrefix(prefix, pathStr)
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if err != nil {
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return err
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}
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if err := proof.VerifyMembership(root, path, value); err != nil {
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return err
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}
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}
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return nil
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}
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// BatchVerifyNonMembership verifies a proof that many paths have not been set
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// to any value in a commitment. It calls the proof's VerifyNonMembership method
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// with the calculated root and the provided paths.
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// Returns false on the first failed non-membership verification.
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func BatchVerifyNonMembership(
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ctx sdk.Context,
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proof exported.Proof,
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prefix exported.Prefix,
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paths []string,
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) error {
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root := CalculateRoot(ctx)
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for _, pathStr := range paths {
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path, err := types.ApplyPrefix(prefix, pathStr)
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if err != nil {
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return err
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}
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if err := proof.VerifyNonMembership(root, path); err != nil {
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return err
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}
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}
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return nil
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}
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