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