plugeth/vm/address.go

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package vm
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import (
"math/big"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/common"
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)
type Address interface {
Call(in []byte) []byte
}
type PrecompiledAccount struct {
Gas func(l int) *big.Int
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fn func(in []byte) []byte
}
func (self PrecompiledAccount) Call(in []byte) []byte {
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return self.fn(in)
}
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var Precompiled = PrecompiledContracts()
// XXX Could set directly. Testing requires resetting and setting of pre compiled contracts.
func PrecompiledContracts() map[string]*PrecompiledAccount {
return map[string]*PrecompiledAccount{
// ECRECOVER
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string(common.LeftPadBytes([]byte{1}, 20)): &PrecompiledAccount{func(l int) *big.Int {
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return GasEcrecover
}, ecrecoverFunc},
// SHA256
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string(common.LeftPadBytes([]byte{2}, 20)): &PrecompiledAccount{func(l int) *big.Int {
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n := big.NewInt(int64(l+31) / 32)
n.Mul(n, GasSha256Word)
return n.Add(n, GasSha256Base)
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}, sha256Func},
// RIPEMD160
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string(common.LeftPadBytes([]byte{3}, 20)): &PrecompiledAccount{func(l int) *big.Int {
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n := big.NewInt(int64(l+31) / 32)
n.Mul(n, GasRipemdWord)
return n.Add(n, GasRipemdBase)
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}, ripemd160Func},
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string(common.LeftPadBytes([]byte{4}, 20)): &PrecompiledAccount{func(l int) *big.Int {
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n := big.NewInt(int64(l+31) / 32)
n.Mul(n, GasIdentityWord)
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return n.Add(n, GasIdentityBase)
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}, memCpy},
}
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}
func sha256Func(in []byte) []byte {
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return crypto.Sha256(in)
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}
func ripemd160Func(in []byte) []byte {
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return common.LeftPadBytes(crypto.Ripemd160(in), 32)
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}
func ecrecoverFunc(in []byte) []byte {
// In case of an invalid sig. Defaults to return nil
defer func() { recover() }()
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hash := in[:32]
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v := common.BigD(in[32:64]).Bytes()[0] - 27
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sig := append(in[64:], v)
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return common.LeftPadBytes(crypto.Sha3(crypto.Ecrecover(append(hash, sig...))[1:])[12:], 32)
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}
func memCpy(in []byte) []byte {
return in
}