Updated to latest sha3 implementation. Fixes #48

ethcrypto/crypto.go

 package ethcrypto
 
 import (
+	"crypto/sha256"
+
 	"code.google.com/p/go.crypto/ripemd160"
 	"code.google.com/p/go.crypto/sha3"
-	"crypto/sha256"
 	"github.com/ethereum/eth-go/ethutil"
 )
 
@@ -21,7 +22,7 @@ func Ripemd160(data []byte) []byte {
 }
 
 func Sha3Bin(data []byte) []byte {
-	d := sha3.NewKeccak256()
+	d := sha3.New256()
 	d.Write(data)
 
 	return d.Sum(nil)

ethcrypto/crypto_test.go

+package ethcrypto
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/ethereum/eth-go/ethutil"
+)
+
+func TestSha3(t *testing.T) {
+	const exp = "3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532"
+	sha3_256 := Sha3Bin([]byte("abc"))
+	if bytes.Compare(sha3_256, ethutil.Hex2Bytes(exp)) != 0 {
+		t.Errorf("Sha3_256 failed. Incorrect result %x", sha3_256)
+	}
+}