forked from cerc-io/plugeth
47 lines
995 B
Go
47 lines
995 B
Go
package vm
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/ethutil"
|
|
)
|
|
|
|
type Address interface {
|
|
Call(in []byte) []byte
|
|
}
|
|
|
|
type PrecompiledAddress struct {
|
|
Gas *big.Int
|
|
fn func(in []byte) []byte
|
|
}
|
|
|
|
func (self PrecompiledAddress) Call(in []byte) []byte {
|
|
return self.fn(in)
|
|
}
|
|
|
|
var Precompiled = map[uint64]*PrecompiledAddress{
|
|
1: &PrecompiledAddress{big.NewInt(500), ecrecoverFunc},
|
|
2: &PrecompiledAddress{big.NewInt(100), sha256Func},
|
|
3: &PrecompiledAddress{big.NewInt(100), ripemd160Func},
|
|
}
|
|
|
|
func sha256Func(in []byte) []byte {
|
|
return crypto.Sha256(in)
|
|
}
|
|
|
|
func ripemd160Func(in []byte) []byte {
|
|
return ethutil.LeftPadBytes(crypto.Ripemd160(in), 32)
|
|
}
|
|
|
|
func ecrecoverFunc(in []byte) []byte {
|
|
// In case of an invalid sig. Defaults to return nil
|
|
defer func() { recover() }()
|
|
|
|
hash := in[:32]
|
|
v := ethutil.BigD(in[32:64]).Bytes()[0] - 27
|
|
sig := append(in[64:], v)
|
|
|
|
return crypto.Sha3(crypto.Ecrecover(append(hash, sig...))[1:])
|
|
}
|