BIP158: add test vectors and generation code

In this commit, we add test vectors for filter and header construction and
the code to generate them. The included test vectors are for testnet with a
value of 20 for P. The code generates filters and headers for values of 1
through 32 for P using testnet blocks. Currently, to run the code,
the `Roasbeef` fork of `btcd` (at https://github.com/roasbeef/btcd) is
required to be running locally in testnet mode; this will be changed in a
future commit after the code is merged into the `btcsuite` mainline.

2 files changed, 375 insertions, 0 deletions

diff --git a/bip-0158/gentestvectors.go b/bip-0158/gentestvectors.go
new file mode 100644
index 0000000..f6560cb
--- /dev/null
+++ b/bip-0158/gentestvectors.go
@@ -0,0 +1,368 @@
+// This program connects to your local btcd and generates test vectors for
+// 5 blocks and collision space sizes of 1-32 bits. Change the RPC cert path
+// and credentials to run on your system. The program assumes you're running
+// a btcd with cfilter support, which mainline btcd doesn't have; in order to
+// circumvent this assumption, comment out the if block that checks for
+// filter size of DefaultP.
+
+package main
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path"
+
+	"github.com/roasbeef/btcd/chaincfg"
+	"github.com/roasbeef/btcd/chaincfg/chainhash"
+	"github.com/roasbeef/btcd/rpcclient"
+	"github.com/roasbeef/btcd/wire"
+	"github.com/roasbeef/btcutil/gcs"
+	"github.com/roasbeef/btcutil/gcs/builder"
+)
+
+func main() {
+	err := os.Mkdir("gcstestvectors", os.ModeDir|0755)
+	if err != nil { // Don't overwrite existing output if any
+		fmt.Println("Couldn't create directory: ", err)
+		return
+	}
+	files := make([]*os.File, 33)
+	prevBasicHeaders := make([]chainhash.Hash, 33)
+	prevExtHeaders := make([]chainhash.Hash, 33)
+	for i := 1; i <= 32; i++ { // Min 1 bit of collision space, max 32
+		var blockBuf bytes.Buffer
+		fName := fmt.Sprintf("gcstestvectors/testnet-%02d.csv", i)
+		file, err := os.Create(fName)
+		if err != nil {
+			fmt.Println("Error creating CSV file: ", err.Error())
+			return
+		}
+		_, err = file.WriteString("Block Height,Block Hash,Block,Previous Basic Header,Previous Ext Header,Basic Filter,Ext Filter,Basic Header,Ext Header\n")
+		if err != nil {
+			fmt.Println("Error writing to CSV file: ", err.Error())
+			return
+		}
+		files[i] = file
+		basicFilter, err := buildBasicFilter(
+			chaincfg.TestNet3Params.GenesisBlock, uint8(i))
+		if err != nil {
+			fmt.Println("Error generating basic filter: ", err.Error())
+			return
+		}
+		prevBasicHeaders[i], err = builder.MakeHeaderForFilter(basicFilter,
+			chaincfg.TestNet3Params.GenesisBlock.Header.PrevBlock)
+		if err != nil {
+			fmt.Println("Error generating header for filter: ", err.Error())
+			return
+		}
+		if basicFilter == nil {
+			basicFilter = &gcs.Filter{}
+		}
+		extFilter, err := buildExtFilter(
+			chaincfg.TestNet3Params.GenesisBlock, uint8(i))
+		if err != nil {
+			fmt.Println("Error generating ext filter: ", err.Error())
+			return
+		}
+		prevExtHeaders[i], err = builder.MakeHeaderForFilter(extFilter,
+			chaincfg.TestNet3Params.GenesisBlock.Header.PrevBlock)
+		if err != nil {
+			fmt.Println("Error generating header for filter: ", err.Error())
+			return
+		}
+		if extFilter == nil {
+			extFilter = &gcs.Filter{}
+		}
+		err = chaincfg.TestNet3Params.GenesisBlock.Serialize(&blockBuf)
+		if err != nil {
+			fmt.Println("Error serializing block to buffer: ", err.Error())
+			return
+		}
+		bfBytes, err := basicFilter.NBytes()
+		if err != nil {
+			fmt.Println("Couldn't get NBytes(): ", err)
+			return
+		}
+		efBytes, err := extFilter.NBytes()
+		if err != nil {
+			fmt.Println("Couldn't get NBytes(): ", err)
+			return
+		}
+		err = writeCSVRow(
+			file,
+			0, // Height
+			*chaincfg.TestNet3Params.GenesisHash,
+			blockBuf.Bytes(),
+			chaincfg.TestNet3Params.GenesisBlock.Header.PrevBlock,
+			chaincfg.TestNet3Params.GenesisBlock.Header.PrevBlock,
+			bfBytes,
+			efBytes,
+			prevBasicHeaders[i],
+			prevExtHeaders[i],
+		)
+		if err != nil {
+			fmt.Println("Error writing to CSV file: ", err.Error())
+			return
+		}
+	}
+	cert, err := ioutil.ReadFile(
+		path.Join(os.Getenv("HOME"), "/.btcd/rpc.cert"))
+	if err != nil {
+		fmt.Println("Couldn't read RPC cert: ", err.Error())
+		return
+	}
+	conf := rpcclient.ConnConfig{
+		Host:         "127.0.0.1:18334",
+		Endpoint:     "ws",
+		User:         "kek",
+		Pass:         "kek",
+		Certificates: cert,
+	}
+	client, err := rpcclient.New(&conf, nil)
+	if err != nil {
+		fmt.Println("Couldn't create a new client: ", err.Error())
+		return
+	}
+	for height := 1; height < 988000; height++ {
+		fmt.Printf("Height: %d\n", height)
+		blockHash, err := client.GetBlockHash(int64(height))
+		if err != nil {
+			fmt.Println("Couldn't get block hash: ", err.Error())
+			return
+		}
+		block, err := client.GetBlock(blockHash)
+		if err != nil {
+			fmt.Println("Couldn't get block hash: ", err.Error())
+			return
+		}
+		var blockBuf bytes.Buffer
+		err = block.Serialize(&blockBuf)
+		if err != nil {
+			fmt.Println("Error serializing block to buffer: ", err.Error())
+			return
+		}
+		blockBytes := blockBuf.Bytes()
+		for i := 1; i <= 32; i++ {
+			basicFilter, err := buildBasicFilter(block, uint8(i))
+			if err != nil {
+				fmt.Println("Error generating basic filter: ", err.Error())
+				return
+			}
+			basicHeader, err := builder.MakeHeaderForFilter(basicFilter,
+				prevBasicHeaders[i])
+			if err != nil {
+				fmt.Println("Error generating header for filter: ", err.Error())
+				return
+			}
+			if basicFilter == nil {
+				basicFilter = &gcs.Filter{}
+			}
+			extFilter, err := buildExtFilter(block, uint8(i))
+			if err != nil {
+				fmt.Println("Error generating ext filter: ", err.Error())
+				return
+			}
+			extHeader, err := builder.MakeHeaderForFilter(extFilter,
+				prevExtHeaders[i])
+			if err != nil {
+				fmt.Println("Error generating header for filter: ", err.Error())
+				return
+			}
+			if extFilter == nil {
+				extFilter = &gcs.Filter{}
+			}
+			if i == builder.DefaultP { // This is the default filter size so we can check against the server's info
+				filter, err := client.GetCFilter(blockHash, wire.GCSFilterRegular)
+				if err != nil {
+					fmt.Println("Error getting basic filter: ", err.Error())
+					return
+				}
+				nBytes, err := basicFilter.NBytes()
+				if err != nil {
+					fmt.Println("Couldn't get NBytes(): ", err)
+					return
+				}
+				if !bytes.Equal(filter.Data, nBytes) {
+					// Don't error on empty filters
+					fmt.Println("Basic filter doesn't match!\n", filter.Data, "\n", nBytes)
+					return
+				}
+				filter, err = client.GetCFilter(blockHash, wire.GCSFilterExtended)
+				if err != nil {
+					fmt.Println("Error getting extended filter: ", err.Error())
+					return
+				}
+				nBytes, err = extFilter.NBytes()
+				if err != nil {
+					fmt.Println("Couldn't get NBytes(): ", err)
+					return
+				}
+				if !bytes.Equal(filter.Data, nBytes) {
+					fmt.Println("Extended filter doesn't match!")
+					return
+				}
+				header, err := client.GetCFilterHeader(blockHash, wire.GCSFilterRegular)
+				if err != nil {
+					fmt.Println("Error getting basic header: ", err.Error())
+					return
+				}
+				if !bytes.Equal(header.PrevFilterHeader[:], basicHeader[:]) {
+					fmt.Println("Basic header doesn't match!")
+					return
+				}
+				header, err = client.GetCFilterHeader(blockHash, wire.GCSFilterExtended)
+				if err != nil {
+					fmt.Println("Error getting extended header: ", err.Error())
+					return
+				}
+				if !bytes.Equal(header.PrevFilterHeader[:], extHeader[:]) {
+					fmt.Println("Extended header doesn't match!")
+					return
+				}
+				fmt.Println("Verified against server")
+			}
+			switch height {
+			case 1, 2, 3, 926485, 987876: // Blocks for test cases
+				var bfBytes []byte
+				var efBytes []byte
+				if basicFilter.N() > 0 {
+					bfBytes, err = basicFilter.NBytes()
+					if err != nil {
+						fmt.Println("Couldn't get NBytes(): ", err)
+						return
+					}
+				}
+				if extFilter.N() > 0 { // Exclude special case for block 987876
+					efBytes, err = extFilter.NBytes()
+					if err != nil {
+						fmt.Println("Couldn't get NBytes(): ", err)
+						return
+					}
+				}
+				writeCSVRow(
+					files[i],
+					height,
+					*blockHash,
+					blockBytes,
+					prevBasicHeaders[i],
+					prevExtHeaders[i],
+					bfBytes,
+					efBytes,
+					basicHeader,
+					extHeader)
+			}
+			prevBasicHeaders[i] = basicHeader
+			prevExtHeaders[i] = extHeader
+		}
+	}
+}
+
+// writeCSVRow writes a test vector to a CSV file.
+func writeCSVRow(file *os.File, height int, blockHash chainhash.Hash,
+	blockBytes []byte, prevBasicHeader, prevExtHeader chainhash.Hash,
+	basicFilter, extFilter []byte, basicHeader, extHeader chainhash.Hash) error {
+	row := fmt.Sprintf("%d,%s,%s,%s,%s,%s,%s,%s,%s\n",
+		height,
+		blockHash.String(),
+		hex.EncodeToString(blockBytes),
+		prevBasicHeader.String(),
+		prevExtHeader.String(),
+		hex.EncodeToString(basicFilter),
+		hex.EncodeToString(extFilter),
+		basicHeader.String(),
+		extHeader.String(),
+	)
+	_, err := file.WriteString(row)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// buildBasicFilter builds a basic GCS filter from a block. A basic GCS filter
+// will contain all the previous outpoints spent within a block, as well as the
+// data pushes within all the outputs created within a block. p is specified as
+// an argument in order to create test vectors with various values for p.
+func buildBasicFilter(block *wire.MsgBlock, p uint8) (*gcs.Filter, error) {
+	blockHash := block.BlockHash()
+	b := builder.WithKeyHashP(&blockHash, p)
+
+	// If the filter had an issue with the specified key, then we force it
+	// to bubble up here by calling the Key() function.
+	_, err := b.Key()
+	if err != nil {
+		return nil, err
+	}
+
+	// In order to build a basic filter, we'll range over the entire block,
+	// adding the outpoint data as well as the data pushes within the
+	// pkScript.
+	for i, tx := range block.Transactions {
+		// First we'll compute the bash of the transaction and add that
+		// directly to the filter.
+		txHash := tx.TxHash()
+		b.AddHash(&txHash)
+
+		// Skip the inputs for the coinbase transaction
+		if i != 0 {
+			// Each each txin, we'll add a serialized version of
+			// the txid:index to the filters data slices.
+			for _, txIn := range tx.TxIn {
+				b.AddOutPoint(txIn.PreviousOutPoint)
+			}
+		}
+
+		// For each output in a transaction, we'll add each of the
+		// individual data pushes within the script.
+		for _, txOut := range tx.TxOut {
+			b.AddEntry(txOut.PkScript)
+		}
+	}
+
+	return b.Build()
+}
+
+// buildExtFilter builds an extended GCS filter from a block. An extended
+// filter supplements a regular basic filter by include all the _witness_ data
+// found within a block. This includes all the data pushes within any signature
+// scripts as well as each element of an input's witness stack. Additionally,
+// the _hashes_ of each transaction are also inserted into the filter. p is
+// specified as an argument in order to create test vectors with various values
+// for p.
+func buildExtFilter(block *wire.MsgBlock, p uint8) (*gcs.Filter, error) {
+	blockHash := block.BlockHash()
+	b := builder.WithKeyHashP(&blockHash, p)
+
+	// If the filter had an issue with the specified key, then we force it
+	// to bubble up here by calling the Key() function.
+	_, err := b.Key()
+	if err != nil {
+		return nil, err
+	}
+
+	// In order to build an extended filter, we add the hash of each
+	// transaction as well as each piece of witness data included in both
+	// the sigScript and the witness stack of an input.
+	for i, tx := range block.Transactions {
+		// Skip the inputs for the coinbase transaction
+		if i != 0 {
+			// Next, for each input, we'll add the sigScript (if
+			// it's present), and also the witness stack (if it's
+			// present)
+			for _, txIn := range tx.TxIn {
+				if txIn.SignatureScript != nil {
+					b.AddScript(txIn.SignatureScript)
+				}
+
+				if len(txIn.Witness) != 0 {
+					b.AddWitness(txIn.Witness)
+				}
+			}
+		}
+	}
+
+	return b.Build()
+}
diff --git a/bip-0158/testnet-20.csv b/bip-0158/testnet-20.csv
new file mode 100644
index 0000000..606e40d
--- /dev/null
+++ b/bip-0158/testnet-20.csv
@@ -0,0 +1,7 @@
+Block Height,Block Hash,Block,Previous Basic Header,Previous Ext Header,Basic Filter,Ext Filter,Basic Header,Ext Header
+0,000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943,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,0000000000000000000000000000000000000000000000000000000000000000,0000000000000000000000000000000000000000000000000000000000000000,0285c7cdbe33a0,00,c0589c7f567cffaf7bc0c9f6ad61710b78d3c1afef5d65a2a08e8a753173aa54,753e0d1c28585269ab770b166ca2cd1b32f9bc918750547941ed4849d5a80ba8
+1,00000000b873e79784647a6c82962c70d228557d24a747ea4d1b8bbe878e1206,0100000043497fd7f826957108f4a30fd9cec3aeba79972084e90ead01ea330900000000bac8b0fa927c0ac8234287e33c5f74d38d354820e24756ad709d7038fc5f31f020e7494dffff001d03e4b6720101000000010000000000000000000000000000000000000000000000000000000000000000ffffffff0e0420e7494d017f062f503253482fffffffff0100f2052a010000002321021aeaf2f8638a129a3156fbe7e5ef635226b0bafd495ff03afe2c843d7e3a4b51ac00000000,c0589c7f567cffaf7bc0c9f6ad61710b78d3c1afef5d65a2a08e8a753173aa54,753e0d1c28585269ab770b166ca2cd1b32f9bc918750547941ed4849d5a80ba8,026929d09bee00,,81e4f3e934488be62758f0b88037aa558262da3190ca018329997a319a0f8b5b,31b674ab635e074717329dabdb25d3cb0e14cb2526000cc2cedac7b5f2595110
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