Introduce samsungtools to decrypt samsung firmware

Samsung provides many firmware upgrade in the format of a .dat
file, at least for nearly all YP's (checked for Q2, R0, T10, Z5).
This is a simple cyclic xor which a fixed key, a md5 sum and a
header specifying the model/version/region.

Change-Id: Ib0461a74196383189fd2d8162da444a85a229c60

utils/samsungtools/Makefile

@@ -0,0 +1,17 @@
+DEFINES=
+CC=gcc
+LD=gcc
+CFLAGS=-g -std=c99 -W -Wall $(DEFINES) `pkg-config --cflags openssl`
+LDFLAGS=`pkg-config --libs openssl`
+BINS=fwdecrypt
+
+all: $(BINS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+fwdecrypt: fwdecrypt.o samsung.o
+	$(LD) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -fr *.o $(BINS)