go-ethereum/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"
"github.com/ethereum/go-ethereum/ethutil"
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)
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 {
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return crypto.Sha256(in)
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}
func ripemd160Func(in []byte) []byte {
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return ethutil.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]
v := ethutil.BigD(in[32:64]).Bytes()[0] - 27
sig := append(in[64:], v)
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return ethutil.LeftPadBytes(crypto.Sha3(crypto.Ecrecover(append(hash, sig...))[1:])[12:], 32)
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}