The great merge

ethutil/helpers.go

@@ -0,0 +1,61 @@
+package ethutil
+
+import (
+	"code.google.com/p/go.crypto/ripemd160"
+	"crypto/sha256"
+	"encoding/hex"
+	"github.com/obscuren/sha3"
+	"strconv"
+)
+
+func Uitoa(i uint32) string {
+	return strconv.FormatUint(uint64(i), 10)
+}
+
+func Sha256Bin(data []byte) []byte {
+	hash := sha256.Sum256(data)
+
+	return hash[:]
+}
+
+func Ripemd160(data []byte) []byte {
+	ripemd := ripemd160.New()
+	ripemd.Write(data)
+
+	return ripemd.Sum(nil)
+}
+
+func Sha3Bin(data []byte) []byte {
+	d := sha3.NewKeccak256()
+	d.Reset()
+	d.Write(data)
+
+	return d.Sum(nil)
+}
+
+// Helper function for comparing slices
+func CompareIntSlice(a, b []int) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i, v := range a {
+		if v != b[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// Returns the amount of nibbles that match each other from 0 ...
+func MatchingNibbleLength(a, b []int) int {
+	i := 0
+	for CompareIntSlice(a[:i+1], b[:i+1]) && i < len(b) {
+		i += 1
+	}
+
+	return i
+}
+
+func Hex(d []byte) string {
+	return hex.EncodeToString(d)
+}