mirror of
https://github.com/nspcc-dev/neo-go.git
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127 lines
3 KiB
Go
127 lines
3 KiB
Go
package vm
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import (
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"encoding/binary"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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var (
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verifyInteropID = emit.InteropNameToID([]byte("Neo.Crypto.ECDsaVerify"))
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multisigInteropID = emit.InteropNameToID([]byte("Neo.Crypto.ECDsaCheckMultiSig"))
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)
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func getNumOfThingsFromInstr(instr opcode.Opcode, param []byte) (int, bool) {
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var nthings int
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switch {
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case opcode.PUSH1 <= instr && instr <= opcode.PUSH16:
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nthings = int(instr-opcode.PUSH1) + 1
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case instr <= opcode.PUSHINT256:
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n := emit.BytesToInt(param)
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if !n.IsInt64() || n.Int64() > MaxArraySize {
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return 0, false
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}
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nthings = int(n.Int64())
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default:
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return 0, false
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}
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if nthings < 1 || nthings > MaxArraySize {
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return 0, false
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}
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return nthings, true
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}
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// IsMultiSigContract checks whether the passed script is a multi-signature
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// contract.
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func IsMultiSigContract(script []byte) bool {
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_, _, ok := ParseMultiSigContract(script)
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return ok
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}
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// ParseMultiSigContract returns number of signatures and list of public keys
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// from the verification script of the contract.
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func ParseMultiSigContract(script []byte) (int, [][]byte, bool) {
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var nsigs, nkeys int
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ctx := NewContext(script)
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instr, param, err := ctx.Next()
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if err != nil {
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return nsigs, nil, false
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}
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nsigs, ok := getNumOfThingsFromInstr(instr, param)
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if !ok {
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return nsigs, nil, false
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}
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var pubs [][]byte
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for {
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instr, param, err = ctx.Next()
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if err != nil {
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return nsigs, nil, false
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}
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if instr != opcode.PUSHDATA1 {
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break
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}
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if len(param) < 33 {
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return nsigs, nil, false
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}
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pubs = append(pubs, param)
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nkeys++
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if nkeys > MaxArraySize {
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return nsigs, nil, false
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}
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}
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if nkeys < nsigs {
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return nsigs, nil, false
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}
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nkeys2, ok := getNumOfThingsFromInstr(instr, param)
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if !ok {
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return nsigs, nil, false
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}
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if nkeys2 != nkeys {
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return nsigs, nil, false
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}
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instr, _, err = ctx.Next()
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if err != nil || instr != opcode.PUSHNULL {
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return nsigs, nil, false
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}
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instr, param, err = ctx.Next()
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if err != nil || instr != opcode.SYSCALL || binary.LittleEndian.Uint32(param) != multisigInteropID {
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return nsigs, nil, false
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}
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instr, _, err = ctx.Next()
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if err != nil || instr != opcode.RET || ctx.ip != len(script) {
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return nsigs, nil, false
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}
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return nsigs, pubs, true
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}
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// IsSignatureContract checks whether the passed script is a signature check
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// contract.
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func IsSignatureContract(script []byte) bool {
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if len(script) != 41 {
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return false
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}
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ctx := NewContext(script)
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instr, param, err := ctx.Next()
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if err != nil || instr != opcode.PUSHDATA1 || len(param) != 33 {
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return false
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}
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instr, _, err = ctx.Next()
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if err != nil || instr != opcode.PUSHNULL {
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return false
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}
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instr, param, err = ctx.Next()
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if err != nil || instr != opcode.SYSCALL || binary.LittleEndian.Uint32(param) != verifyInteropID {
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return false
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}
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return true
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}
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// IsStandardContract checks whether the passed script is a signature or
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// multi-signature contract.
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func IsStandardContract(script []byte) bool {
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return IsSignatureContract(script) || IsMultiSigContract(script)
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}
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