Erlang integration (basic) done. Docs updated

include/base64.h

@@ -0,0 +1,7 @@
+#if !defined __AE__BASE64_H
+#define __AE__BASE64_H
+
+char *bin2hex(unsigned char*, int);
+unsigned char *hex2bin(const char*);
+
+#endif

include/ecrecover.h

@@ -1,2 +1,6 @@
+#if !defined __AE_ECRECOVER_H
+#define __AE_ECRECOVER_H
 
-void ecrecover(const unsigned char *input, unsigned char *output);
+int ecrecover(const unsigned char *input, unsigned char *output);
+
+#endif

include/erl_comm.h

@@ -0,0 +1,20 @@
+#if !defined __AE__ERL_COMM_H
+#define __AE__ERL_COMM_H
+
+#ifdef DEBUG
+#include <stdio.h>
+#define DEBUG_PRINTF printf
+#else
+#define DEBUG_PRINTF
+#endif
+
+typedef unsigned char byte;
+
+#define ECRECOVER_BUFFER_MAX 1024
+
+int read_cmd(byte *buf);
+int write_cmd(byte *buf, int len);
+int read_exact(byte *buf, int len);
+int write_exact(byte *buf, int len);
+
+#endif