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blst.go
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blst.go
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// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// DO NOT MODIFY THIS FILE!!
// The file is generated from *.tgo by generate.py
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
/*
* Copyright Supranational LLC
* Licensed under the Apache License, Version 2.0, see LICENSE for details.
* SPDX-License-Identifier: Apache-2.0
*/
package blst
// #cgo CFLAGS: -I${SRCDIR}/.. -I${SRCDIR}/../../build -I${SRCDIR}/../../src -D__BLST_CGO__ -fno-builtin-memcpy -fno-builtin-memset
// #cgo amd64 CFLAGS: -D__ADX__ -mno-avx
// // no-asm 64-bit platforms from https://go.dev/doc/install/source
// #cgo loong64 mips64 mips64le ppc64 ppc64le riscv64 s390x CFLAGS: -D__BLST_NO_ASM__
//
// #include "blst.h"
//
// #if defined(__x86_64__) && (defined(__unix__) || defined(__APPLE__))
// # include <signal.h>
// # include <unistd.h>
// static void handler(int signum)
// { ssize_t n = write(2, "Caught SIGILL in blst_cgo_init, "
// "consult <blst>/bindings/go/README.md.\n", 70);
// _exit(128+SIGILL);
// (void)n;
// }
// __attribute__((constructor)) static void blst_cgo_init()
// { blst_fp temp = { 0 };
// struct sigaction act = { handler }, oact;
// sigaction(SIGILL, &act, &oact);
// blst_fp_sqr(&temp, &temp);
// sigaction(SIGILL, &oact, NULL);
// }
// #endif
//
// static void go_pairing_init(blst_pairing *new_ctx, bool hash_or_encode,
// const byte *DST, size_t DST_len)
// { if (DST != NULL) {
// byte *dst = (byte*)new_ctx + blst_pairing_sizeof();
// for(size_t i = 0; i < DST_len; i++) dst[i] = DST[i];
// DST = dst;
// }
// blst_pairing_init(new_ctx, hash_or_encode, DST, DST_len);
// }
// static void go_pairing_as_fp12(blst_fp12 *pt, blst_pairing *ctx)
// { *pt = *blst_pairing_as_fp12(ctx); }
//
// static void go_p1slice_to_affine(blst_p1_affine dst[],
// const blst_p1 points[], size_t npoints)
// { const blst_p1 *ppoints[2] = { points, NULL };
// blst_p1s_to_affine(dst, ppoints, npoints);
// }
// static void go_p1slice_add(blst_p1 *dst, const blst_p1_affine points[],
// size_t npoints)
// { const blst_p1_affine *ppoints[2] = { points, NULL };
// blst_p1s_add(dst, ppoints, npoints);
// }
// static void go_p2slice_to_affine(blst_p2_affine dst[],
// const blst_p2 points[], size_t npoints)
// { const blst_p2 *ppoints[2] = { points, NULL };
// blst_p2s_to_affine(dst, ppoints, npoints);
// }
// static void go_p2slice_add(blst_p2 *dst, const blst_p2_affine points[],
// size_t npoints)
// { const blst_p2_affine *ppoints[2] = { points, NULL };
// blst_p2s_add(dst, ppoints, npoints);
// }
//
// static void go_p1_mult_n_acc(blst_p1 *acc, const blst_fp *x, bool affine,
// const byte *scalar, size_t nbits)
// { blst_p1 m[1];
// const void *p = x;
// if (p == NULL)
// p = blst_p1_generator();
// else if (affine)
// blst_p1_from_affine(m, p), p = m;
// blst_p1_mult(m, p, scalar, nbits);
// blst_p1_add_or_double(acc, acc, m);
// }
// static void go_p2_mult_n_acc(blst_p2 *acc, const blst_fp2 *x, bool affine,
// const byte *scalar, size_t nbits)
// { blst_p2 m[1];
// const void *p = x;
// if (p == NULL)
// p = blst_p2_generator();
// else if (affine)
// blst_p2_from_affine(m, p), p = m;
// blst_p2_mult(m, p, scalar, nbits);
// blst_p2_add_or_double(acc, acc, m);
// }
//
// static void go_p1_sub_assign(blst_p1 *a, const blst_fp *x, bool affine)
// { blst_p1 minus_b;
// if (affine)
// blst_p1_from_affine(&minus_b, (const blst_p1_affine*)x);
// else
// minus_b = *(const blst_p1*)x;
// blst_p1_cneg(&minus_b, 1);
// blst_p1_add_or_double(a, a, &minus_b);
// }
//
// static void go_p2_sub_assign(blst_p2 *a, const blst_fp2 *x, bool affine)
// { blst_p2 minus_b;
// if (affine)
// blst_p2_from_affine(&minus_b, (const blst_p2_affine*)x);
// else
// minus_b = *(const blst_p2*)x;
// blst_p2_cneg(&minus_b, 1);
// blst_p2_add_or_double(a, a, &minus_b);
// }
//
// static bool go_scalar_from_bendian(blst_scalar *ret, const byte *in)
// { blst_scalar_from_bendian(ret, in);
// return blst_sk_check(ret);
// }
// static bool go_hash_to_scalar(blst_scalar *ret,
// const byte *msg, size_t msg_len,
// const byte *DST, size_t DST_len)
// { byte elem[48];
// blst_expand_message_xmd(elem, sizeof(elem), msg, msg_len, DST, DST_len);
// return blst_scalar_from_be_bytes(ret, elem, sizeof(elem));
// }
// static void go_miller_loop_n(blst_fp12 *dst, const blst_p2_affine Q[],
// const blst_p1_affine P[],
// size_t npoints, bool acc)
// { const blst_p2_affine *Qs[2] = { Q, NULL };
// const blst_p1_affine *Ps[2] = { P, NULL };
// if (acc) {
// blst_fp12 tmp;
// blst_miller_loop_n(&tmp, Qs, Ps, npoints);
// blst_fp12_mul(dst, dst, &tmp);
// } else {
// blst_miller_loop_n(dst, Qs, Ps, npoints);
// }
// }
// static void go_fp12slice_mul(blst_fp12 *dst, const blst_fp12 in[], size_t n)
// { size_t i;
// blst_fp12_mul(dst, &in[0], &in[1]);
// for (i = 2; i < n; i++)
// blst_fp12_mul(dst, dst, &in[i]);
// }
// static bool go_p1_affine_validate(const blst_p1_affine *p, bool infcheck)
// { if (infcheck && blst_p1_affine_is_inf(p))
// return 0;
// return blst_p1_affine_in_g1(p);
// }
// static bool go_p2_affine_validate(const blst_p2_affine *p, bool infcheck)
// { if (infcheck && blst_p2_affine_is_inf(p))
// return 0;
// return blst_p2_affine_in_g2(p);
// }
import "C"
import (
"fmt"
"math/bits"
"runtime"
"sync"
"sync/atomic"
)
const BLST_SCALAR_BYTES = 256 / 8
const BLST_FP_BYTES = 384 / 8
const BLST_P1_COMPRESS_BYTES = BLST_FP_BYTES
const BLST_P1_SERIALIZE_BYTES = BLST_FP_BYTES * 2
const BLST_P2_COMPRESS_BYTES = BLST_FP_BYTES * 2
const BLST_P2_SERIALIZE_BYTES = BLST_FP_BYTES * 4
type Scalar = C.blst_scalar
type Fp = C.blst_fp
type Fp2 = C.blst_fp2
type Fp6 = C.blst_fp6
type Fp12 = C.blst_fp12
type P1 = C.blst_p1
type P2 = C.blst_p2
type P1Affine = C.blst_p1_affine
type P2Affine = C.blst_p2_affine
type Message = []byte
type Pairing = []C.blst_pairing
type SecretKey = Scalar
type P1s []P1
type P2s []P2
type P1Affines []P1Affine
type P2Affines []P2Affine
//
// Configuration
//
var maxProcs = initMaxProcs()
func initMaxProcs() int {
maxProcs := runtime.GOMAXPROCS(0)
var version float32
_, err := fmt.Sscanf(runtime.Version(), "go%f", &version)
if err != nil || version < 1.14 {
// be cooperative and leave one processor for the application
maxProcs -= 1
}
if maxProcs <= 0 {
maxProcs = 1
}
return maxProcs
}
func SetMaxProcs(max int) {
if max <= 0 {
max = 1
}
maxProcs = max
}
func numThreads(maxThreads int) int {
numThreads := maxProcs
// take into consideration the possility that application reduced
// GOMAXPROCS after |maxProcs| was initialized
numProcs := runtime.GOMAXPROCS(0)
if maxProcs > numProcs {
numThreads = numProcs
}
if maxThreads > 0 && numThreads > maxThreads {
return maxThreads
}
return numThreads
}
var cgo_pairingSizeOf = C.blst_pairing_sizeof()
var cgo_p1Generator = *C.blst_p1_generator()
var cgo_p2Generator = *C.blst_p2_generator()
var cgo_fp12One = *C.blst_fp12_one()
// Secret key
func (sk *SecretKey) Zeroize() {
var zero SecretKey
*sk = zero
}
func KeyGen(ikm []byte, optional ...[]byte) *SecretKey {
var sk SecretKey
var info []byte
if len(optional) > 0 {
info = optional[0]
}
if len(ikm) < 32 {
return nil
}
C.blst_keygen(&sk, (*C.byte)(&ikm[0]), C.size_t(len(ikm)),
ptrOrNil(info), C.size_t(len(info)))
// Postponing secret key zeroing till garbage collection can be too
// late to be effective, but every little bit helps...
runtime.SetFinalizer(&sk, func(sk *SecretKey) { sk.Zeroize() })
return &sk
}
func KeyGenV3(ikm []byte, optional ...[]byte) *SecretKey {
if len(ikm) < 32 {
return nil
}
var sk SecretKey
var info []byte
if len(optional) > 0 {
info = optional[0]
}
C.blst_keygen_v3(&sk, (*C.byte)(&ikm[0]), C.size_t(len(ikm)),
ptrOrNil(info), C.size_t(len(info)))
// Postponing secret key zeroing till garbage collection can be too
// late to be effective, but every little bit helps...
runtime.SetFinalizer(&sk, func(sk *SecretKey) { sk.Zeroize() })
return &sk
}
func KeyGenV45(ikm []byte, salt []byte, optional ...[]byte) *SecretKey {
if len(ikm) < 32 {
return nil
}
var sk SecretKey
var info []byte
if len(optional) > 0 {
info = optional[0]
}
C.blst_keygen_v4_5(&sk, (*C.byte)(&ikm[0]), C.size_t(len(ikm)),
(*C.byte)(&salt[0]), C.size_t(len(salt)),
ptrOrNil(info), C.size_t(len(info)))
// Postponing secret key zeroing till garbage collection can be too
// late to be effective, but every little bit helps...
runtime.SetFinalizer(&sk, func(sk *SecretKey) { sk.Zeroize() })
return &sk
}
func KeyGenV5(ikm []byte, salt []byte, optional ...[]byte) *SecretKey {
if len(ikm) < 32 {
return nil
}
var sk SecretKey
var info []byte
if len(optional) > 0 {
info = optional[0]
}
C.blst_keygen_v5(&sk, (*C.byte)(&ikm[0]), C.size_t(len(ikm)),
(*C.byte)(&salt[0]), C.size_t(len(salt)),
ptrOrNil(info), C.size_t(len(info)))
// Postponing secret key zeroing till garbage collection can be too
// late to be effective, but every little bit helps...
runtime.SetFinalizer(&sk, func(sk *SecretKey) { sk.Zeroize() })
return &sk
}
func DeriveMasterEip2333(ikm []byte) *SecretKey {
if len(ikm) < 32 {
return nil
}
var sk SecretKey
C.blst_derive_master_eip2333(&sk, (*C.byte)(&ikm[0]), C.size_t(len(ikm)))
// Postponing secret key zeroing till garbage collection can be too
// late to be effective, but every little bit helps...
runtime.SetFinalizer(&sk, func(sk *SecretKey) { sk.Zeroize() })
return &sk
}
func (master *SecretKey) DeriveChildEip2333(child_index uint32) *SecretKey {
var sk SecretKey
C.blst_derive_child_eip2333(&sk, master, C.uint(child_index))
// Postponing secret key zeroing till garbage collection can be too
// late to be effective, but every little bit helps...
runtime.SetFinalizer(&sk, func(sk *SecretKey) { sk.Zeroize() })
return &sk
}
// Pairing
func pairingSizeOf(DST_len C.size_t) int {
return int((cgo_pairingSizeOf + DST_len + 7) / 8)
}
func PairingCtx(hash_or_encode bool, DST []byte) Pairing {
DST_len := C.size_t(len(DST))
ctx := make([]C.blst_pairing, pairingSizeOf(DST_len))
C.go_pairing_init(&ctx[0], C.bool(hash_or_encode), ptrOrNil(DST), DST_len)
return ctx
}
func PairingCommit(ctx Pairing) {
C.blst_pairing_commit(&ctx[0])
}
func PairingMerge(ctx Pairing, ctx1 Pairing) int {
r := C.blst_pairing_merge(&ctx[0], &ctx1[0])
return int(r)
}
func PairingFinalVerify(ctx Pairing, optional ...*Fp12) bool {
var gtsig *Fp12
if len(optional) > 0 {
gtsig = optional[0]
}
return bool(C.blst_pairing_finalverify(&ctx[0], gtsig))
}
func PairingRawAggregate(ctx Pairing, q *P2Affine, p *P1Affine) {
C.blst_pairing_raw_aggregate(&ctx[0], q, p)
}
func PairingAsFp12(ctx Pairing) *Fp12 {
var pt Fp12
C.go_pairing_as_fp12(&pt, &ctx[0])
return &pt
}
func Fp12One() Fp12 {
return cgo_fp12One
}
func Fp12FinalVerify(pt1 *Fp12, pt2 *Fp12) bool {
return bool(C.blst_fp12_finalverify(pt1, pt2))
}
func Fp12MillerLoop(q *P2Affine, p *P1Affine) *Fp12 {
var pt Fp12
C.blst_miller_loop(&pt, q, p)
return &pt
}
func Fp12MillerLoopN(qs []P2Affine, ps []P1Affine) *Fp12 {
if len(qs) != len(ps) || len(qs) == 0 {
panic("inputs' lengths mismatch")
}
nElems := uint32(len(qs))
nThreads := uint32(maxProcs)
if nThreads == 1 || nElems == 1 {
var pt Fp12
C.go_miller_loop_n(&pt, &qs[0], &ps[0], C.size_t(nElems), false)
return &pt
}
stride := (nElems + nThreads - 1) / nThreads
if stride > 16 {
stride = 16
}
strides := (nElems + stride - 1) / stride
if nThreads > strides {
nThreads = strides
}
msgsCh := make(chan Fp12, nThreads)
curElem := uint32(0)
for tid := uint32(0); tid < nThreads; tid++ {
go func() {
acc := Fp12One()
first := true
for {
work := atomic.AddUint32(&curElem, stride) - stride
if work >= nElems {
break
}
n := nElems - work
if n > stride {
n = stride
}
C.go_miller_loop_n(&acc, &qs[work], &ps[work], C.size_t(n),
C.bool(!first))
first = false
}
msgsCh <- acc
}()
}
var ret = make([]Fp12, nThreads)
for i := range ret {
ret[i] = <-msgsCh
}
var pt Fp12
C.go_fp12slice_mul(&pt, &ret[0], C.size_t(nThreads))
return &pt
}
func (pt *Fp12) MulAssign(p *Fp12) {
C.blst_fp12_mul(pt, pt, p)
}
func (pt *Fp12) FinalExp() {
C.blst_final_exp(pt, pt)
}
func (pt *Fp12) InGroup() bool {
return bool(C.blst_fp12_in_group(pt))
}
func (pt *Fp12) ToBendian() []byte {
var out [BLST_FP_BYTES * 12]byte
C.blst_bendian_from_fp12((*C.byte)(&out[0]), pt)
return out[:]
}
func (pt1 *Fp12) Equals(pt2 *Fp12) bool {
return *pt1 == *pt2
}
func ptrOrNil(bytes []byte) *C.byte {
var ptr *C.byte
if len(bytes) > 0 {
ptr = (*C.byte)(&bytes[0])
}
return ptr
}
//
// MIN-PK
//
//
// PublicKey
//
func (pk *P1Affine) From(s *Scalar) *P1Affine {
C.blst_sk_to_pk2_in_g1(nil, pk, s)
return pk
}
func (pk *P1Affine) KeyValidate() bool {
return bool(C.go_p1_affine_validate(pk, true))
}
// sigInfcheck, check for infinity, is a way to avoid going
// into resource-consuming verification. Passing 'false' is
// always cryptographically safe, but application might want
// to guard against obviously bogus individual[!] signatures.
func (sig *P2Affine) SigValidate(sigInfcheck bool) bool {
return bool(C.go_p2_affine_validate(sig, C.bool(sigInfcheck)))
}
//
// Sign
//
func (sig *P2Affine) Sign(sk *SecretKey, msg []byte, dst []byte,
optional ...interface{}) *P2Affine {
augSingle, aug, useHash, ok := parseOpts(optional...)
if !ok || len(aug) != 0 {
return nil
}
var q *P2
if useHash {
q = HashToG2(msg, dst, augSingle)
} else {
q = EncodeToG2(msg, dst, augSingle)
}
C.blst_sign_pk2_in_g1(nil, sig, q, sk)
return sig
}
//
// Signature
//
// Functions to return a signature and public key+augmentation tuple.
// This enables point decompression (if needed) to happen in parallel.
type sigGetterP2 func() *P2Affine
type pkGetterP1 func(i uint32, temp *P1Affine) (*P1Affine, []byte)
// Single verify with decompressed pk
func (sig *P2Affine) Verify(sigGroupcheck bool, pk *P1Affine, pkValidate bool,
msg Message, dst []byte,
optional ...interface{}) bool { // useHash bool, aug []byte
aug, _, useHash, ok := parseOpts(optional...)
if !ok {
return false
}
return sig.AggregateVerify(sigGroupcheck, []*P1Affine{pk}, pkValidate,
[]Message{msg}, dst, useHash, [][]byte{aug})
}
// Single verify with compressed pk
// Uses a dummy signature to get the correct type
func (dummy *P2Affine) VerifyCompressed(sig []byte, sigGroupcheck bool,
pk []byte, pkValidate bool, msg Message, dst []byte,
optional ...bool) bool { // useHash bool, usePksAsAugs bool
return dummy.AggregateVerifyCompressed(sig, sigGroupcheck,
[][]byte{pk}, pkValidate,
[]Message{msg}, dst, optional...)
}
// Aggregate verify with uncompressed signature and public keys
// Note that checking message uniqueness, if required, is left to the user.
// Not all signature schemes require it and this keeps the binding minimal
// and fast. Refer to the Uniq function for one method method of performing
// this check.
func (sig *P2Affine) AggregateVerify(sigGroupcheck bool,
pks []*P1Affine, pksVerify bool, msgs []Message, dst []byte,
optional ...interface{}) bool { // useHash bool, augs [][]byte
// sanity checks and argument parsing
n := len(pks)
if n == 0 || len(msgs) != n {
return false
}
_, augs, useHash, ok := parseOpts(optional...)
useAugs := len(augs) != 0
if !ok || (useAugs && len(augs) != n) {
return false
}
sigFn := func() *P2Affine {
return sig
}
pkFn := func(i uint32, _ *P1Affine) (*P1Affine, []byte) {
if useAugs {
return pks[i], augs[i]
}
return pks[i], nil
}
return coreAggregateVerifyPkInG1(sigFn, sigGroupcheck, pkFn, pksVerify,
msgs, dst, useHash)
}
// Aggregate verify with compressed signature and public keys
// Uses a dummy signature to get the correct type
func (_ *P2Affine) AggregateVerifyCompressed(sig []byte, sigGroupcheck bool,
pks [][]byte, pksVerify bool, msgs []Message, dst []byte,
optional ...bool) bool { // useHash bool, usePksAsAugs bool
// sanity checks and argument parsing
if len(pks) != len(msgs) {
return false
}
useHash := true
if len(optional) > 0 {
useHash = optional[0]
}
usePksAsAugs := false
if len(optional) > 1 {
usePksAsAugs = optional[1]
}
sigFn := func() *P2Affine {
sigP := new(P2Affine)
if sigP.Uncompress(sig) == nil {
return nil
}
return sigP
}
pkFn := func(i uint32, pk *P1Affine) (*P1Affine, []byte) {
bytes := pks[i]
if len(bytes) == BLST_P1_SERIALIZE_BYTES && (bytes[0]&0x80) == 0 {
// Not compressed
if pk.Deserialize(bytes) == nil {
return nil, nil
}
} else if len(bytes) == BLST_P1_COMPRESS_BYTES && (bytes[0]&0x80) != 0 {
if pk.Uncompress(bytes) == nil {
return nil, nil
}
} else {
return nil, nil
}
if usePksAsAugs {
return pk, bytes
}
return pk, nil
}
return coreAggregateVerifyPkInG1(sigFn, sigGroupcheck, pkFn, pksVerify,
msgs, dst, useHash)
}
func coreAggregateVerifyPkInG1(sigFn sigGetterP2, sigGroupcheck bool,
pkFn pkGetterP1, pkValidate bool, msgs []Message, dst []byte,
optional ...bool) bool { // useHash
n := len(msgs)
if n == 0 {
return false
}
useHash := true
if len(optional) > 0 {
useHash = optional[0]
}
numCores := runtime.GOMAXPROCS(0)
numThreads := numThreads(n)
// Each thread will determine next message to process by atomically
// incrementing curItem, process corresponding pk,msg[,aug] tuple and
// repeat until n is exceeded. The resulting accumulations will be
// fed into the msgsCh channel.
msgsCh := make(chan Pairing, numThreads)
valid := int32(1)
curItem := uint32(0)
mutex := sync.Mutex{}
mutex.Lock()
for tid := 0; tid < numThreads; tid++ {
go func() {
pairing := PairingCtx(useHash, dst)
var temp P1Affine
for atomic.LoadInt32(&valid) > 0 {
// Get a work item
work := atomic.AddUint32(&curItem, 1) - 1
if work >= uint32(n) {
break
} else if work == 0 && maxProcs == numCores-1 &&
numThreads == maxProcs {
// Avoid consuming all cores by waiting until the
// main thread has completed its miller loop before
// proceeding.
mutex.Lock()
mutex.Unlock() //nolint:staticcheck
}
// Pull Public Key and augmentation blob
curPk, aug := pkFn(work, &temp)
if curPk == nil {
atomic.StoreInt32(&valid, 0)
break
}
// Pairing and accumulate
ret := PairingAggregatePkInG1(pairing, curPk, pkValidate,
nil, false, msgs[work], aug)
if ret != C.BLST_SUCCESS {
atomic.StoreInt32(&valid, 0)
break
}
// application might have some async work to do
runtime.Gosched()
}
if atomic.LoadInt32(&valid) > 0 {
PairingCommit(pairing)
msgsCh <- pairing
} else {
msgsCh <- nil
}
}()
}
// Uncompress and check signature
var gtsig Fp12
sig := sigFn()
if sig == nil {
atomic.StoreInt32(&valid, 0)
}
if atomic.LoadInt32(&valid) > 0 && sigGroupcheck &&
!sig.SigValidate(false) {
atomic.StoreInt32(&valid, 0)
}
if atomic.LoadInt32(&valid) > 0 {
C.blst_aggregated_in_g2(>sig, sig)
}
mutex.Unlock()
// Accumulate the thread results
var pairings Pairing
for i := 0; i < numThreads; i++ {
msg := <-msgsCh
if msg != nil {
if pairings == nil {
pairings = msg
} else {
ret := PairingMerge(pairings, msg)
if ret != C.BLST_SUCCESS {
atomic.StoreInt32(&valid, 0)
}
}
}
}
if atomic.LoadInt32(&valid) == 0 || pairings == nil {
return false
}
return PairingFinalVerify(pairings, >sig)
}
func CoreVerifyPkInG1(pk *P1Affine, sig *P2Affine, hash_or_encode bool,
msg Message, dst []byte, optional ...[]byte) int {
var aug []byte
if len(optional) > 0 {
aug = optional[0]
}
if runtime.NumGoroutine() < maxProcs {
sigFn := func() *P2Affine {
return sig
}
pkFn := func(_ uint32, _ *P1Affine) (*P1Affine, []byte) {
return pk, aug
}
if !coreAggregateVerifyPkInG1(sigFn, true, pkFn, true, []Message{msg},
dst, hash_or_encode) {
return C.BLST_VERIFY_FAIL
}
return C.BLST_SUCCESS
}
return int(C.blst_core_verify_pk_in_g1(pk, sig, C.bool(hash_or_encode),
ptrOrNil(msg), C.size_t(len(msg)),
ptrOrNil(dst), C.size_t(len(dst)),
ptrOrNil(aug), C.size_t(len(aug))))
}
// pks are assumed to be verified for proof of possession,
// which implies that they are already group-checked
func (sig *P2Affine) FastAggregateVerify(sigGroupcheck bool,
pks []*P1Affine, msg Message, dst []byte,
optional ...interface{}) bool { // pass-through to Verify
n := len(pks)
// TODO: return value for length zero?
if n == 0 {
return false
}
aggregator := new(P1Aggregate)
if !aggregator.Aggregate(pks, false) {
return false
}
pkAff := aggregator.ToAffine()
// Verify
return sig.Verify(sigGroupcheck, pkAff, false, msg, dst, optional...)
}
func (_ *P2Affine) MultipleAggregateVerify(sigs []*P2Affine,
sigsGroupcheck bool, pks []*P1Affine, pksVerify bool,
msgs []Message, dst []byte, randFn func(*Scalar), randBits int,
optional ...interface{}) bool { // useHash
// Sanity checks and argument parsing
n := len(pks)
if n == 0 || len(msgs) != n || len(sigs) != n {
return false
}
_, augs, useHash, ok := parseOpts(optional...)
useAugs := len(augs) != 0
if !ok || (useAugs && len(augs) != n) {
return false
}
paramsFn :=
func(work uint32, _ *P2Affine, _ *P1Affine, rand *Scalar) (
*P2Affine, *P1Affine, *Scalar, []byte) {
randFn(rand)
var aug []byte
if useAugs {
aug = augs[work]
}
return sigs[work], pks[work], rand, aug
}
return multipleAggregateVerifyPkInG1(paramsFn, sigsGroupcheck, pksVerify,
msgs, dst, randBits, useHash)
}
type mulAggGetterPkInG1 func(work uint32, sig *P2Affine, pk *P1Affine,
rand *Scalar) (*P2Affine, *P1Affine, *Scalar, []byte)
func multipleAggregateVerifyPkInG1(paramsFn mulAggGetterPkInG1,
sigsGroupcheck bool, pksVerify bool, msgs []Message,
dst []byte, randBits int,
optional ...bool) bool { // useHash
n := len(msgs)
if n == 0 {
return false
}
useHash := true
if len(optional) > 0 {
useHash = optional[0]
}
numThreads := numThreads(n)
// Each thread will determine next message to process by atomically
// incrementing curItem, process corresponding pk,msg[,aug] tuple and
// repeat until n is exceeded. The resulting accumulations will be
// fed into the msgsCh channel.
msgsCh := make(chan Pairing, numThreads)
valid := int32(1)
curItem := uint32(0)
for tid := 0; tid < numThreads; tid++ {
go func() {
pairing := PairingCtx(useHash, dst)
var tempRand Scalar
var tempPk P1Affine
var tempSig P2Affine
for atomic.LoadInt32(&valid) > 0 {
// Get a work item
work := atomic.AddUint32(&curItem, 1) - 1
if work >= uint32(n) {
break
}
curSig, curPk, curRand, aug := paramsFn(work, &tempSig,
&tempPk, &tempRand)
if PairingMulNAggregatePkInG1(pairing, curPk, pksVerify,
curSig, sigsGroupcheck, curRand,
randBits, msgs[work], aug) !=
C.BLST_SUCCESS {
atomic.StoreInt32(&valid, 0)
break
}
// application might have some async work to do
runtime.Gosched()
}
if atomic.LoadInt32(&valid) > 0 {
PairingCommit(pairing)
msgsCh <- pairing
} else {
msgsCh <- nil
}
}()
}
// Accumulate the thread results
var pairings Pairing
for i := 0; i < numThreads; i++ {
msg := <-msgsCh
if msg != nil {
if pairings == nil {
pairings = msg
} else {
ret := PairingMerge(pairings, msg)
if ret != C.BLST_SUCCESS {
atomic.StoreInt32(&valid, 0)
}
}
}
}
if atomic.LoadInt32(&valid) == 0 || pairings == nil {
return false
}
return PairingFinalVerify(pairings, nil)
}
//
// Aggregate P2
//
type aggGetterP2 func(i uint32, temp *P2Affine) *P2Affine
type P2Aggregate struct {
v *P2
}
// Aggregate uncompressed elements
func (agg *P2Aggregate) Aggregate(elmts []*P2Affine,
groupcheck bool) bool {
if len(elmts) == 0 {
return true
}
getter := func(i uint32, _ *P2Affine) *P2Affine { return elmts[i] }
return agg.coreAggregate(getter, groupcheck, len(elmts))
}
func (agg *P2Aggregate) AggregateWithRandomness(pointsIf interface{},
scalarsIf interface{}, nbits int, groupcheck bool) bool {
if groupcheck && !P2AffinesValidate(pointsIf) {
return false
}
agg.v = P2AffinesMult(pointsIf, scalarsIf, nbits)
return true
}
// Aggregate compressed elements
func (agg *P2Aggregate) AggregateCompressed(elmts [][]byte,
groupcheck bool) bool {
if len(elmts) == 0 {
return true
}
getter := func(i uint32, p *P2Affine) *P2Affine {
bytes := elmts[i]
if p.Uncompress(bytes) == nil {
return nil
}
return p
}
return agg.coreAggregate(getter, groupcheck, len(elmts))
}
func (agg *P2Aggregate) AddAggregate(other *P2Aggregate) {
if other.v == nil {
// do nothing
} else if agg.v == nil {
agg.v = other.v
} else {
C.blst_p2_add_or_double(agg.v, agg.v, other.v)
}
}
func (agg *P2Aggregate) Add(elmt *P2Affine, groupcheck bool) bool {
if groupcheck && !bool(C.blst_p2_affine_in_g2(elmt)) {
return false
}
if agg.v == nil {
agg.v = new(P2)
C.blst_p2_from_affine(agg.v, elmt)
} else {
C.blst_p2_add_or_double_affine(agg.v, agg.v, elmt)
}
return true
}
func (agg *P2Aggregate) ToAffine() *P2Affine {
if agg.v == nil {
return new(P2Affine)
}
return agg.v.ToAffine()
}
func (agg *P2Aggregate) coreAggregate(getter aggGetterP2, groupcheck bool,
n int) bool {
if n == 0 {
return true
}
// operations are considered short enough for not to care about
// keeping one core free...
numThreads := runtime.GOMAXPROCS(0)
if numThreads > n {
numThreads = n
}
valid := int32(1)
type result struct {