initial commit

src/ntlm/helpers.go

@@ -0,0 +1,48 @@
+package ntlm
+
+import (
+	"bytes"
+	"crypto/rand"
+	"unicode/utf16"
+)
+
+// Concatenate two byte slices into a new slice
+func concat(ar ...[]byte) []byte {
+	return bytes.Join(ar, nil)
+}
+
+// Create a 0 initialized slice of bytes
+func zeroBytes(length int) []byte {
+	return make([]byte, length, length)
+}
+
+func randomBytes(length int) []byte {
+	randombytes := make([]byte, length)
+	_, err := rand.Read(randombytes)
+	if err != nil {
+	} // TODO: What to do with err here
+	return randombytes
+}
+
+// Zero pad the input byte slice to the given size
+// bytes - input byte slice
+// offset - where to start taking the bytes from the input slice
+// size - size of the output byte slize
+func zeroPaddedBytes(bytes []byte, offset int, size int) []byte {
+	newSlice := zeroBytes(size)
+	for i := 0; i < size && i+offset < len(bytes); i++ {
+		newSlice[i] = bytes[i+offset]
+	}
+	return newSlice
+}
+
+func utf16FromString(s string) []byte {
+	encoded := utf16.Encode([]rune(s))
+	// TODO: I'm sure there is an easier way to do the conversion from utf16 to bytes
+	result := zeroBytes(len(encoded) * 2)
+	for i := 0; i < len(encoded); i++ {
+		result[i*2] = byte(encoded[i])
+		result[i*2+1] = byte(encoded[i] << 8)
+	}
+	return result
+}