Precompiled crypto contracts

1 files changed, 44 insertions, 0 deletions

diff --git a/ethvm/address.go b/ethvm/address.go
new file mode 100644
index 000000000..51e0d1cd7
--- /dev/null
+++ b/ethvm/address.go
@@ -0,0 +1,44 @@
+package ethvm
+
+import (
+	"math/big"
+
+	"github.com/ethereum/eth-go/ethcrypto"
+	"github.com/ethereum/eth-go/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},
+}
+
+var NoAddr = PrecompiledAddress{}
+
+func sha256Func(in []byte) []byte {
+	return ethcrypto.Sha256(in)
+}
+
+func ripemd160Func(in []byte) []byte {
+	return ethutil.RightPadBytes(ethcrypto.Ripemd160(in), 32)
+}
+
+func ecrecoverFunc(in []byte) []byte {
+	// In case of an invalid sig. Defaults to return nil
+	defer func() { recover() }()
+
+	return ethcrypto.Ecrecover(in)
+}