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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package crypto
// #cgo CFLAGS: -Wall -std=c99
// #cgo darwin,amd64 CFLAGS: -I${SRCDIR}/libs/darwin/amd64/include
// #cgo darwin,amd64 LDFLAGS: ${SRCDIR}/libs/darwin/amd64/lib/libsodium.a
// #cgo darwin,arm64 CFLAGS: -I${SRCDIR}/libs/darwin/arm64/include
// #cgo darwin,arm64 LDFLAGS: ${SRCDIR}/libs/darwin/arm64/lib/libsodium.a
// #cgo linux,amd64 CFLAGS: -I${SRCDIR}/libs/linux/amd64/include
// #cgo linux,amd64 LDFLAGS: ${SRCDIR}/libs/linux/amd64/lib/libsodium.a
// #cgo linux,arm64 CFLAGS: -I${SRCDIR}/libs/linux/arm64/include
// #cgo linux,arm64 LDFLAGS: ${SRCDIR}/libs/linux/arm64/lib/libsodium.a
// #cgo linux,arm CFLAGS: -I${SRCDIR}/libs/linux/arm/include
// #cgo linux,arm LDFLAGS: ${SRCDIR}/libs/linux/arm/lib/libsodium.a
// #cgo windows,amd64 CFLAGS: -I${SRCDIR}/libs/windows/amd64/include
// #cgo windows,amd64 LDFLAGS: ${SRCDIR}/libs/windows/amd64/lib/libsodium.a
// #include <stdint.h>
// enum {
// sizeofPtr = sizeof(void*),
// sizeofULongLong = sizeof(unsigned long long),
// };
// int ed25519_batch_wrapper(const unsigned char **messages2D,
// const unsigned char **publicKeys2D,
// const unsigned char **signatures2D,
// const unsigned char *messages1D,
// const unsigned long long *mlen,
// const unsigned char *publicKeys1D,
// const unsigned char *signatures1D,
// size_t num,
// int *valid_p);
import "C"
import (
"errors"
"unsafe"
)
// BatchVerifier enqueues signatures to be validated in batch.
type BatchVerifier struct {
messages []Hashable // contains a slice of messages to be hashed. Each message is varible length
publicKeys []SignatureVerifier // contains a slice of public keys. Each individual public key is 32 bytes.
signatures []Signature // contains a slice of signatures keys. Each individual signature is 64 bytes.
}
const minBatchVerifierAlloc = 16
// Batch verifications errors
var (
ErrBatchHasFailedSigs = errors.New("At least one signature didn't pass verification")
)
//export ed25519_randombytes_unsafe
func ed25519_randombytes_unsafe(p unsafe.Pointer, len C.size_t) {
randBuf := (*[1 << 30]byte)(p)[:len:len]
RandBytes(randBuf)
}
// MakeBatchVerifier creates a BatchVerifier instance.
func MakeBatchVerifier() *BatchVerifier {
return MakeBatchVerifierWithHint(minBatchVerifierAlloc)
}
// MakeBatchVerifierWithHint creates a BatchVerifier instance. This function pre-allocates
// amount of free space to enqueue signatures without expanding
func MakeBatchVerifierWithHint(hint int) *BatchVerifier {
// preallocate enough storage for the expected usage. We will reallocate as needed.
if hint < minBatchVerifierAlloc {
hint = minBatchVerifierAlloc
}
return &BatchVerifier{
messages: make([]Hashable, 0, hint),
publicKeys: make([]SignatureVerifier, 0, hint),
signatures: make([]Signature, 0, hint),
}
}
// EnqueueSignature enqueues a signature to be enqueued
func (b *BatchVerifier) EnqueueSignature(sigVerifier SignatureVerifier, message Hashable, sig Signature) {
// do we need to reallocate ?
if len(b.messages) == cap(b.messages) {
b.expand()
}
b.messages = append(b.messages, message)
b.publicKeys = append(b.publicKeys, sigVerifier)
b.signatures = append(b.signatures, sig)
}
func (b *BatchVerifier) expand() {
messages := make([]Hashable, len(b.messages), len(b.messages)*2)
publicKeys := make([]SignatureVerifier, len(b.publicKeys), len(b.publicKeys)*2)
signatures := make([]Signature, len(b.signatures), len(b.signatures)*2)
copy(messages, b.messages)
copy(publicKeys, b.publicKeys)
copy(signatures, b.signatures)
b.messages = messages
b.publicKeys = publicKeys
b.signatures = signatures
}
// GetNumberOfEnqueuedSignatures returns the number of signatures currently enqueued into the BatchVerifier
func (b *BatchVerifier) GetNumberOfEnqueuedSignatures() int {
return len(b.messages)
}
// Verify verifies that all the signatures are valid. in that case nil is returned
func (b *BatchVerifier) Verify() error {
_, err := b.VerifyWithFeedback()
return err
}
// VerifyWithFeedback verifies that all the signatures are valid.
// if all sigs are valid, nil will be returned for err (failed will have all false)
// if some signatures are invalid, true will be set in failed at the corresponding indexes, and
// ErrBatchVerificationFailed for err
func (b *BatchVerifier) VerifyWithFeedback() (failed []bool, err error) {
if len(b.messages) == 0 {
return nil, nil
}
const estimatedMessageSize = 64
msgLengths := make([]uint64, 0, len(b.messages))
var messages = make([]byte, 0, len(b.messages)*estimatedMessageSize)
lenWas := 0
for i := range b.messages {
messages = HashRepToBuff(b.messages[i], messages)
msgLengths = append(msgLengths, uint64(len(messages)-lenWas))
lenWas = len(messages)
}
allValid, failed := batchVerificationImpl(messages, msgLengths, b.publicKeys, b.signatures)
if allValid {
return failed, nil
}
return failed, ErrBatchHasFailedSigs
}
// batchVerificationImpl invokes the ed25519 batch verification algorithm.
// it returns true if all the signatures were authentically signed by the owners
// otherwise, returns false, and sets the indexes of the failed sigs in failed
func batchVerificationImpl(messages []byte, msgLengths []uint64, publicKeys []SignatureVerifier, signatures []Signature) (allSigsValid bool, failed []bool) {
numberOfSignatures := len(msgLengths)
valid := make([]C.int, numberOfSignatures)
messages2D := make([]*C.uchar, numberOfSignatures)
publicKeys2D := make([]*C.uchar, numberOfSignatures)
signatures2D := make([]*C.uchar, numberOfSignatures)
// call the batch verifier
allValid := C.ed25519_batch_wrapper(
&messages2D[0], &publicKeys2D[0], &signatures2D[0],
(*C.uchar)(&messages[0]),
(*C.ulonglong)(&msgLengths[0]),
(*C.uchar)(&publicKeys[0][0]),
(*C.uchar)(&signatures[0][0]),
C.size_t(numberOfSignatures),
(*C.int)(&valid[0]))
failed = make([]bool, numberOfSignatures)
for i := 0; i < numberOfSignatures; i++ {
failed[i] = (valid[i] == 0)
}
return allValid == 0, failed
}
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