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-rw-r--r--vm/address.go42
1 files changed, 42 insertions, 0 deletions
diff --git a/vm/address.go b/vm/address.go
new file mode 100644
index 000000000..c4aa1eb7c
--- /dev/null
+++ b/vm/address.go
@@ -0,0 +1,42 @@
+package vm
+
+import (
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/ethcrypto"
+ "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 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)
+}