Adding the rest of files:

- ASM is disabled
- Neug needs full rewrite
- Flash is based on PiMoroni 4MB flash (needs adjust)

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

sha512.h

@@ -0,0 +1,17 @@
+#define SHA512_DIGEST_SIZE  64
+#define SHA512_BLOCK_SIZE   128
+
+typedef struct
+{
+  uint64_t total[2];
+  uint64_t state[8];
+  uint64_t wbuf[16];
+} sha512_context;
+
+void sha512 (const unsigned char *input, unsigned int ilen,
+	     unsigned char output[64]);
+void sha512_start (sha512_context *ctx);
+void sha512_finish (sha512_context *ctx, unsigned char output[64]);
+void sha512_update (sha512_context *ctx, const unsigned char *input,
+		    unsigned int ilen);
+void sha512_process (sha512_context *ctx);