Added sha512 encoding

crypto/Makefile

@@ -2,7 +2,7 @@ CC = gcc
 CFLAGS = -O0 -I../include -g3
 LFLAGS =
 DEPS = 
-OBJS = rsa.o sha256.o
+OBJS = rsa.o sha256.o sha512.o
 
 %.o: %.c $(DEPS)
 	$(CC) -c -o $@ $< $(CFLAGS)

crypto/sha512.c

@@ -0,0 +1,13 @@
+#include "mbedtls/sha512.h"
+
+/***
+ * hash a string using SHA512
+ * @param input the input string
+ * @param input_length the length of the input string
+ * @param output where to place the results
+ * @returns 1
+ */
+int libp2p_crypto_hashing_sha512(const unsigned char* input, size_t input_length, unsigned char output[128]) {
+	mbedtls_sha512(input, input_length, output, 0);
+	return 1;
+}

include/libp2p/crypto/sha512.h

@@ -0,0 +1,11 @@
+#pragma once
+
+/***
+ * hash a string using SHA512
+ * @param input the input string
+ * @param input_length the length of the input string
+ * @param output where to place the results
+ * @returns 1
+ */
+int libp2p_crypto_hashing_sha512(const unsigned char* input, size_t input_length, unsigned char output[128]);
+