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Copy the block verification functions from https://github.com/cardano-foundation/cardano-ibc-incubator with minimal modifications. Signed-off-by: Chris Gianelloni <[email protected]>
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// Copyright 2024 Cardano Foundation | ||
// Copyright 2024 Blink Labs Software | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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// This file is taken almost verbatim (including comments) from | ||
// https://github.com/cardano-foundation/cardano-ibc-incubator | ||
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package ledger | ||
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import ( | ||
"bytes" | ||
"encoding/hex" | ||
"errors" | ||
"fmt" | ||
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"github.com/blinklabs-io/gouroboros/cbor" | ||
) | ||
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func VerifyBlock(block BlockHexCbor) (error, bool, string, uint64, uint64) { | ||
headerCborHex := block.HeaderCbor | ||
epochNonceHex := block.Eta0 | ||
bodyHex := block.BlockBodyCbor | ||
slotPerKesPeriod := uint64(block.Spk) | ||
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isValid := false | ||
vrfHex := "" | ||
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// check is KES valid | ||
headerCborByte, headerDecodeError := hex.DecodeString(headerCborHex) | ||
if headerDecodeError != nil { | ||
return errors.New(fmt.Sprintf("VerifyBlock: headerCborByte decode error, %v", headerDecodeError.Error())), false, "", 0, 0 | ||
} | ||
header, headerUnmarshalError := NewBabbageBlockHeaderFromCbor(headerCborByte) | ||
if headerUnmarshalError != nil { | ||
return errors.New(fmt.Sprintf("VerifyBlock: header unmarshall error, %v", headerUnmarshalError.Error())), false, "", 0, 0 | ||
} | ||
isKesValid, errKes := VerifyKes(header, slotPerKesPeriod) | ||
if errKes != nil { | ||
return errors.New(fmt.Sprintf("VerifyBlock: kes invalid, %v", errKes.Error())), false, "", 0, 0 | ||
} | ||
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// check is VRF valid | ||
// Ref: https://github.com/IntersectMBO/ouroboros-consensus/blob/de74882102236fdc4dd25aaa2552e8b3e208448c/ouroboros-consensus-protocol/src/ouroboros-consensus-protocol/Ouroboros/Consensus/Protocol/Praos.hs#L541 | ||
epochNonceByte, epochNonceDecodeError := hex.DecodeString(epochNonceHex) | ||
if epochNonceDecodeError != nil { | ||
return errors.New(fmt.Sprintf("VerifyBlock: epochNonceByte decode error, %v", epochNonceDecodeError.Error())), false, "", 0, 0 | ||
} | ||
vrfBytes := header.Body.VrfKey[:] | ||
vrfResult := header.Body.VrfResult.([]interface{}) | ||
vrfProofBytes := vrfResult[1].([]byte) | ||
vrfOutputBytes := vrfResult[0].([]byte) | ||
seed := MkInputVrf(int64(header.Body.Slot), epochNonceByte) | ||
output, errVrf := VrfVerifyAndHash(vrfBytes, vrfProofBytes, seed) | ||
if errVrf != nil { | ||
return errors.New(fmt.Sprintf("VerifyBlock: vrf invalid, %v", errVrf.Error())), false, "", 0, 0 | ||
} | ||
isVrfValid := bytes.Equal(output, vrfOutputBytes) | ||
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// check if block data valid | ||
blockBodyHash := header.Body.BlockBodyHash | ||
blockBodyHashHex := hex.EncodeToString(blockBodyHash[:]) | ||
isBodyValid, isBodyValidError := VerifyBlockBody(bodyHex, blockBodyHashHex) | ||
if isBodyValidError != nil { | ||
return errors.New(fmt.Sprintf("VerifyBlock: VerifyBlockBody error, %v", isBodyValidError.Error())), false, "", 0, 0 | ||
} | ||
isValid = isKesValid && isVrfValid && isBodyValid | ||
vrfHex = hex.EncodeToString(vrfBytes) | ||
blockNo := header.Body.BlockNumber | ||
slotNo := header.Body.Slot | ||
return nil, isValid, vrfHex, blockNo, slotNo | ||
} | ||
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func ExtractBlockData(bodyHex string) ([]UTXOOutput, []RegisCert, []DeRegisCert, error) { | ||
rawDataBytes, rawDataBytesError := hex.DecodeString(bodyHex) | ||
if rawDataBytesError != nil { | ||
return nil, nil, nil, errors.New(fmt.Sprintf("ExtractBlockData: bodyHex decode error, %v", rawDataBytesError.Error())) | ||
} | ||
var txsRaw [][]string | ||
_, err := cbor.Decode(rawDataBytes, &txsRaw) | ||
if err != nil { | ||
return nil, nil, nil, errors.New(fmt.Sprintf("ExtractBlockData: txsRaw decode error, %v", err.Error())) | ||
} | ||
txBodies, txBodiesError := GetTxBodies(txsRaw) | ||
if err != nil { | ||
return nil, nil, nil, errors.New(fmt.Sprintf("ExtractBlockData: GetTxBodies error, %v", txBodiesError.Error())) | ||
} | ||
uTXOOutput, regisCerts, deRegisCerts, getBlockOutputError := GetBlockOutput(txBodies) | ||
if getBlockOutputError != nil { | ||
return nil, nil, nil, errors.New(fmt.Sprintf("ExtractBlockData: GetBlockOutput error, %v", getBlockOutputError.Error())) | ||
} | ||
return uTXOOutput, regisCerts, deRegisCerts, nil | ||
} | ||
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// These are copied from types.go | ||
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type BlockHexCbor struct { | ||
_ struct{} `cbor:",toarray"` | ||
Flag int | ||
HeaderCbor string | ||
Eta0 string | ||
Spk int | ||
BlockBodyCbor string | ||
} |