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add kzg context to erigon-lib (#984)
Both the core erigon client and the erigon-lib txpool need to access kzg functionality for EIP-4844, so moving this here where it can be reused across both.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package kzg | ||
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| import ( | ||
| "crypto/sha256" | ||
| "fmt" | ||
| "sync" | ||
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| gokzg4844 "github.com/crate-crypto/go-kzg-4844" | ||
| ) | ||
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| const ( | ||
| BlobCommitmentVersionKZG uint8 = 0x01 | ||
| ) | ||
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| type VersionedHash [32]byte | ||
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| var gCryptoCtx gokzg4844.Context | ||
| var initCryptoCtx sync.Once | ||
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| // InitializeCryptoCtx initializes the global context object returned via CryptoCtx | ||
| func InitializeCryptoCtx() { | ||
| initCryptoCtx.Do(func() { | ||
| // Initialize context to match the configurations that the | ||
| // specs are using. | ||
| ctx, err := gokzg4844.NewContext4096Insecure1337() | ||
| if err != nil { | ||
| panic(fmt.Sprintf("could not create context, err : %v", err)) | ||
| } | ||
| gCryptoCtx = *ctx | ||
| }) | ||
| } | ||
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| // Ctx returns a context object that stores all of the necessary configurations to allow one to | ||
| // create and verify blob proofs. This function is expensive to run if the crypto context isn't | ||
| // initialized, so production services should pre-initialize by calling InitializeCryptoCtx. | ||
| func Ctx() gokzg4844.Context { | ||
| InitializeCryptoCtx() | ||
| return gCryptoCtx | ||
| } | ||
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| // KZGToVersionedHash implements kzg_to_versioned_hash from EIP-4844 | ||
| func KZGToVersionedHash(kzg gokzg4844.KZGCommitment) VersionedHash { | ||
| h := sha256.Sum256(kzg[:]) | ||
| h[0] = BlobCommitmentVersionKZG | ||
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| return VersionedHash(h) | ||
| } |
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