crypto/kzg4844: pull in the C and Go libs for KZG cryptography (#27155)

* cryto/kzg4844: pull in the C and Go libs for KZG cryptography

* go.mod: pull in the KZG libraries

* crypto/kzg4844: add basic becnhmarks for ballpark numbers

* cmd, crypto: integrate both CKZG and GoKZG all the time, add flag

* cmd/utils, crypto/kzg4844: run library init on startup

* crypto/kzg4844: make linter happy

* crypto/kzg4844: push missing file

* crypto/kzg4844: fully disable CKZG but leave in the sources

* build, crypto/kzg4844, internal: link CKZG by default and with portable mode

* crypto/kzg4844: drop verifying the trusted setup in gokzg

* internal/build: yolo until it works?

* cmd/utils: make flag description friendlier

Co-authored-by: Martin Holst Swende <martin@swende.se>

* crypto/ckzg: no need for double availability check

* build: tiny flag cleanup nitpick

---------

Co-authored-by: Martin Holst Swende <martin@swende.se>

cmd/geth/main.go

@@ -107,6 +107,7 @@ var (
 		utils.CachePreimagesFlag,
 		utils.CacheLogSizeFlag,
 		utils.FDLimitFlag,
+		utils.CryptoKZGFlag,
 		utils.ListenPortFlag,
 		utils.DiscoveryPortFlag,
 		utils.MaxPeersFlag,

cmd/utils/flags.go

@@ -45,6 +45,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/eth"
 	ethcatalyst "github.com/ethereum/go-ethereum/eth/catalyst"
 	"github.com/ethereum/go-ethereum/eth/downloader"
@@ -454,6 +455,12 @@ var (
 		Usage:    "Raise the open file descriptor resource limit (default = system fd limit)",
 		Category: flags.PerfCategory,
 	}
+	CryptoKZGFlag = &cli.StringFlag{
+		Name:     "crypto.kzg",
+		Usage:    "KZG library implementation to use; gokzg (recommended) or ckzg",
+		Value:    "gokzg",
+		Category: flags.PerfCategory,
+	}
 
 	// Miner settings
 	MiningEnabledFlag = &cli.BoolFlag{
@@ -1747,7 +1754,6 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 			cfg.EthDiscoveryURLs = SplitAndTrim(urls)
 		}
 	}
-
 	// Override any default configs for hard coded networks.
 	switch {
 	case ctx.Bool(MainnetFlag.Name):
@@ -1857,6 +1863,14 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 			SetDNSDiscoveryDefaults(cfg, params.MainnetGenesisHash)
 		}
 	}
+	// Set any dangling config values
+	if ctx.String(CryptoKZGFlag.Name) != "gokzg" && ctx.String(CryptoKZGFlag.Name) != "ckzg" {
+		Fatalf("--%s flag must be 'gokzg' or 'ckzg'", CryptoKZGFlag.Name)
+	}
+	log.Info("Initializing the KZG library", "backend", ctx.String(CryptoKZGFlag.Name))
+	if err := kzg4844.UseCKZG(ctx.String(CryptoKZGFlag.Name) == "ckzg"); err != nil {
+		Fatalf("Failed to set KZG library implementation to %s: %v", ctx.String(CryptoKZGFlag.Name), err)
+	}
 }
 
 // SetDNSDiscoveryDefaults configures DNS discovery with the given URL if