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crypto.go
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crypto.go
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package vm
import (
"crypto/sha256"
"hash"
"golang.org/x/crypto/sha3"
"github.com/bytom/crypto"
"github.com/bytom/crypto/ed25519"
"github.com/bytom/math/checked"
)
func opSha256(vm *virtualMachine) error {
return doHash(vm, sha256.New)
}
func opSha3(vm *virtualMachine) error {
return doHash(vm, sha3.New256)
}
func doHash(vm *virtualMachine, hashFactory func() hash.Hash) error {
x, err := vm.pop(false)
if err != nil {
return err
}
cost := int64(len(x))
if cost < 64 {
cost = 64
}
err = vm.applyCost(cost)
if err != nil {
return err
}
h := hashFactory()
_, err = h.Write(x)
if err != nil {
return err
}
return vm.push(h.Sum(nil), false)
}
func opCheckSig(vm *virtualMachine) error {
err := vm.applyCost(1024)
if err != nil {
return err
}
pubkeyBytes, err := vm.pop(true)
if err != nil {
return err
}
msg, err := vm.pop(true)
if err != nil {
return err
}
sig, err := vm.pop(true)
if err != nil {
return err
}
if len(msg) != 32 {
return ErrBadValue
}
if len(pubkeyBytes) != ed25519.PublicKeySize {
return vm.pushBool(false, true)
}
return vm.pushBool(ed25519.Verify(ed25519.PublicKey(pubkeyBytes), msg, sig), true)
}
func opCheckMultiSig(vm *virtualMachine) error {
numPubkeys, err := vm.popInt64(true)
if err != nil {
return err
}
pubCost, ok := checked.MulInt64(numPubkeys, 1024)
if numPubkeys < 0 || !ok {
return ErrBadValue
}
err = vm.applyCost(pubCost)
if err != nil {
return err
}
numSigs, err := vm.popInt64(true)
if err != nil {
return err
}
if numSigs < 0 || numSigs > numPubkeys || (numPubkeys > 0 && numSigs == 0) {
return ErrBadValue
}
pubkeyByteses := make([][]byte, 0, numPubkeys)
for i := int64(0); i < numPubkeys; i++ {
pubkeyBytes, err := vm.pop(true)
if err != nil {
return err
}
pubkeyByteses = append(pubkeyByteses, pubkeyBytes)
}
msg, err := vm.pop(true)
if err != nil {
return err
}
if len(msg) != 32 {
return ErrBadValue
}
sigs := make([][]byte, 0, numSigs)
for i := int64(0); i < numSigs; i++ {
sig, err := vm.pop(true)
if err != nil {
return err
}
sigs = append(sigs, sig)
}
pubkeys := make([]ed25519.PublicKey, 0, numPubkeys)
for _, p := range pubkeyByteses {
if len(p) != ed25519.PublicKeySize {
return vm.pushBool(false, true)
}
pubkeys = append(pubkeys, ed25519.PublicKey(p))
}
for len(sigs) > 0 && len(pubkeys) > 0 {
if ed25519.Verify(pubkeys[0], msg, sigs[0]) {
sigs = sigs[1:]
}
pubkeys = pubkeys[1:]
}
return vm.pushBool(len(sigs) == 0, true)
}
func opTxSigHash(vm *virtualMachine) error {
err := vm.applyCost(256)
if err != nil {
return err
}
if vm.context.TxSigHash == nil {
return ErrContext
}
return vm.push(vm.context.TxSigHash(), false)
}
func opHash160(vm *virtualMachine) error {
data, err := vm.pop(false)
if err != nil {
return err
}
cost := int64(len(data) + 64)
if err = vm.applyCost(cost); err != nil {
return err
}
return vm.push(crypto.Ripemd160(data), false)
}