286 lines
6.6 KiB
Go
286 lines
6.6 KiB
Go
package cgokzg4844
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// #cgo CFLAGS: -I${SRCDIR}/../../src
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// #cgo CFLAGS: -I${SRCDIR}/blst_headers
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// #cgo CFLAGS: -DFIELD_ELEMENTS_PER_BLOB=4096
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// #include "c_kzg_4844.c"
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import "C"
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import (
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"unsafe"
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// So its functions are available during compilation.
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_ "github.com/supranational/blst/bindings/go"
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)
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const (
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BytesPerBlob = C.BYTES_PER_BLOB
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BytesPerCommitment = C.BYTES_PER_COMMITMENT
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BytesPerFieldElement = C.BYTES_PER_FIELD_ELEMENT
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BytesPerProof = C.BYTES_PER_PROOF
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FieldElementsPerBlob = C.FIELD_ELEMENTS_PER_BLOB
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)
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type (
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CKzgRet int
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Bytes32 [32]byte
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Bytes48 [48]byte
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KZGCommitment Bytes48
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KZGProof Bytes48
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Blob [BytesPerBlob]byte
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)
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const (
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C_KZG_OK CKzgRet = C.C_KZG_OK
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C_KZG_BADARGS CKzgRet = C.C_KZG_BADARGS
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C_KZG_ERROR CKzgRet = C.C_KZG_ERROR
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C_KZG_MALLOC CKzgRet = C.C_KZG_MALLOC
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)
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var (
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loaded = false
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settings = C.KZGSettings{}
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)
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///////////////////////////////////////////////////////////////////////////////
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// Public functions
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///////////////////////////////////////////////////////////////////////////////
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/*
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LoadTrustedSetup is the binding for:
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C_KZG_RET load_trusted_setup(
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KZGSettings *out,
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const uint8_t *g1_bytes,
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size_t n1,
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const uint8_t *g2_bytes,
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size_t n2);
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*/
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func LoadTrustedSetup(g1Bytes, g2Bytes []byte) CKzgRet {
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if loaded {
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panic("trusted setup is already loaded")
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}
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if len(g1Bytes)%48 != 0 {
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panic("len(g1Bytes) is not a multiple of 48")
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}
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if len(g2Bytes)%96 != 0 {
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panic("len(g2Bytes) is not a multiple of 96")
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}
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numG1Elements := len(g1Bytes) / 48
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numG2Elements := len(g2Bytes) / 96
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ret := C.load_trusted_setup(
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&settings,
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*(**C.uint8_t)(unsafe.Pointer(&g1Bytes)),
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(C.size_t)(numG1Elements),
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*(**C.uint8_t)(unsafe.Pointer(&g2Bytes)),
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(C.size_t)(numG2Elements))
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if CKzgRet(ret) == C_KZG_OK {
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loaded = true
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}
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return CKzgRet(ret)
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}
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/*
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LoadTrustedSetupFile is the binding for:
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C_KZG_RET load_trusted_setup_file(
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KZGSettings *out,
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FILE *in);
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*/
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func LoadTrustedSetupFile(trustedSetupFile string) CKzgRet {
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if loaded {
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panic("trusted setup is already loaded")
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}
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fp := C.fopen(C.CString(trustedSetupFile), C.CString("rb"))
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if fp == nil {
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panic("error reading trusted setup")
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}
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ret := C.load_trusted_setup_file(&settings, fp)
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C.fclose(fp)
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if CKzgRet(ret) == C_KZG_OK {
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loaded = true
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}
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return CKzgRet(ret)
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}
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/*
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FreeTrustedSetup is the binding for:
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void free_trusted_setup(
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KZGSettings *s);
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*/
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func FreeTrustedSetup() {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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C.free_trusted_setup(&settings)
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loaded = false
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}
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/*
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BlobToKZGCommitment is the binding for:
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C_KZG_RET blob_to_kzg_commitment(
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KZGCommitment *out,
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const Blob *blob,
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const KZGSettings *s);
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*/
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func BlobToKZGCommitment(blob Blob) (KZGCommitment, CKzgRet) {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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commitment := KZGCommitment{}
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ret := C.blob_to_kzg_commitment(
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(*C.KZGCommitment)(unsafe.Pointer(&commitment)),
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(*C.Blob)(unsafe.Pointer(&blob)),
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&settings)
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return commitment, CKzgRet(ret)
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}
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/*
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ComputeKZGProof is the binding for:
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C_KZG_RET compute_kzg_proof(
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KZGProof *proof_out,
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Bytes32 *y_out,
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const Blob *blob,
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const Bytes32 *z_bytes,
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const KZGSettings *s);
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*/
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func ComputeKZGProof(blob Blob, zBytes Bytes32) (KZGProof, Bytes32, CKzgRet) {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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proof := KZGProof{}
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y := Bytes32{}
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ret := C.compute_kzg_proof(
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(*C.KZGProof)(unsafe.Pointer(&proof)),
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(*C.Bytes32)(unsafe.Pointer(&y)),
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(*C.Blob)(unsafe.Pointer(&blob)),
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(*C.Bytes32)(unsafe.Pointer(&zBytes)),
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&settings)
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return proof, y, CKzgRet(ret)
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}
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/*
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ComputeBlobKZGProof is the binding for:
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C_KZG_RET compute_blob_kzg_proof(
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KZGProof *out,
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const Blob *blob,
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const Bytes48 *commitment_bytes,
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const KZGSettings *s);
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*/
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func ComputeBlobKZGProof(blob Blob, commitmentBytes Bytes48) (KZGProof, CKzgRet) {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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proof := KZGProof{}
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ret := C.compute_blob_kzg_proof(
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(*C.KZGProof)(unsafe.Pointer(&proof)),
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(*C.Blob)(unsafe.Pointer(&blob)),
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(*C.Bytes48)(unsafe.Pointer(&commitmentBytes)),
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&settings)
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return proof, CKzgRet(ret)
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}
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/*
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VerifyKZGProof is the binding for:
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C_KZG_RET verify_kzg_proof(
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bool *out,
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const Bytes48 *commitment_bytes,
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const Bytes32 *z_bytes,
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const Bytes32 *y_bytes,
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const Bytes48 *proof_bytes,
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const KZGSettings *s);
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*/
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func VerifyKZGProof(commitmentBytes Bytes48, zBytes, yBytes Bytes32, proofBytes Bytes48) (bool, CKzgRet) {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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var result C.bool
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ret := C.verify_kzg_proof(
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&result,
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(*C.Bytes48)(unsafe.Pointer(&commitmentBytes)),
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(*C.Bytes32)(unsafe.Pointer(&zBytes)),
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(*C.Bytes32)(unsafe.Pointer(&yBytes)),
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(*C.Bytes48)(unsafe.Pointer(&proofBytes)),
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&settings)
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return bool(result), CKzgRet(ret)
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}
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/*
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VerifyBlobKZGProof is the binding for:
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C_KZG_RET verify_blob_kzg_proof(
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bool *out,
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const Blob *blob,
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const Bytes48 *commitment_bytes,
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const Bytes48 *proof_bytes,
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const KZGSettings *s);
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*/
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func VerifyBlobKZGProof(blob Blob, commitmentBytes, proofBytes Bytes48) (bool, CKzgRet) {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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var result C.bool
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ret := C.verify_blob_kzg_proof(
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&result,
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(*C.Blob)(unsafe.Pointer(&blob)),
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(*C.Bytes48)(unsafe.Pointer(&commitmentBytes)),
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(*C.Bytes48)(unsafe.Pointer(&proofBytes)),
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&settings)
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return bool(result), CKzgRet(ret)
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}
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/*
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VerifyBlobKZGProofBatch is the binding for:
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C_KZG_RET verify_blob_kzg_proof_batch(
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bool *out,
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const Blob *blobs,
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const Bytes48 *commitments_bytes,
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const Bytes48 *proofs_bytes,
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const KZGSettings *s);
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*/
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func VerifyBlobKZGProofBatch(blobs []Blob, commitmentsBytes, proofsBytes []Bytes48) (bool, CKzgRet) {
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if !loaded {
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panic("trusted setup isn't loaded")
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}
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if len(blobs) != len(commitmentsBytes) || len(blobs) != len(proofsBytes) {
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return false, C_KZG_BADARGS
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}
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var result C.bool
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ret := C.verify_blob_kzg_proof_batch(
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&result,
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*(**C.Blob)(unsafe.Pointer(&blobs)),
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*(**C.Bytes48)(unsafe.Pointer(&commitmentsBytes)),
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*(**C.Bytes48)(unsafe.Pointer(&proofsBytes)),
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(C.size_t)(len(blobs)),
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&settings)
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return bool(result), CKzgRet(ret)
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}
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///////////////////////////////////////////////////////////////////////////////
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// Private functions
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///////////////////////////////////////////////////////////////////////////////
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/*
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sha256 is the binding for:
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void blst_sha256(
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byte out[32],
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const byte *msg,
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size_t msg_len);
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*/
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func sha256(msg []byte) Bytes32 {
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var out Bytes32
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C.blst_sha256(
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(*C.byte)(unsafe.Pointer(&out)),
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*(**C.byte)(unsafe.Pointer(&msg)),
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(C.size_t)(len(msg)))
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return out
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}
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