ethcrypto: fix the tests

The Sha3 test contained the wrong expected result. Note that the
implementation hasn't changed, the test simply contained an outdated
expected value that was valid for the previous implementation.

ethcrypto/crypto_test.go

@@ -2,16 +2,35 @@ package ethcrypto
 
 import (
 	"bytes"
+	"encoding/hex"
 	"testing"
-
-	"github.com/ethereum/go-ethereum/ethutil"
 )
 
-// FIPS 202 test (reverted back to FIPS 180)
+// These tests are sanity checks.
+// They should ensure that we don't e.g. use Sha3-224 instead of Sha3-256
+// and that the sha3 library uses keccak-f permutation.
+
 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)
+	msg := []byte("abc")
+	exp, _ := hex.DecodeString("4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45")
+	checkhash(t, "Sha3-256", Sha3, msg, exp)
+}
+
+func TestSha256(t *testing.T) {
+	msg := []byte("abc")
+	exp, _ := hex.DecodeString("ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad")
+	checkhash(t, "Sha256", Sha256, msg, exp)
+}
+
+func TestRipemd160(t *testing.T) {
+	msg := []byte("abc")
+	exp, _ := hex.DecodeString("8eb208f7e05d987a9b044a8e98c6b087f15a0bfc")
+	checkhash(t, "Ripemd160", Ripemd160, msg, exp)
+}
+
+func checkhash(t *testing.T, name string, f func([]byte) []byte, msg, exp []byte) {
+	sum := f(msg)
+	if bytes.Compare(exp, sum) != 0 {
+		t.Errorf("hash %s returned wrong result.\ngot:  %x\nwant: %x", name, sum, exp)
 	}
 }