add example to doc

Author: TerenceGe

.gitignore

@@ -17,4 +17,3 @@ TAGS
 *pbxproj
 *xcodeproj
 build
-*print*

README.org

@@ -40,45 +40,52 @@ Add -DSR25519_FORCE_32BIT to force the use of 32 bit routines even when compilin
 cmake .. -DSR25519_FORCE_32BIT=true
 #+END_SRC
 
+* Test
+#+BEGIN_SRC sh
+./sr25519DonnaTests
+#+END_SRC
 * Integration
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/CMakeLists.txt#L13][example]]
 #+BEGIN_SRC cmake
 include_directories(../build/include/) # replace it with your sr25519-donna installed location if required
 link_directories(../build/lib/) # replace it with your sr25519-donna installed location if required
 
 add_executable(yourApp ${SOURCE_FILES})
 target_link_libraries(yourApp libsr25519_donna.dylib) # replace it with libsr25519_donna_static.a if you want to use static lib.
 
-#+END_SRC
-* Test
-#+BEGIN_SRC sh
-./sr25519DonnaTests
 #+END_SRC
 * Usage
 ** include
 #+BEGIN_SRC C
     #include "sr25519-donna.h"
 #+END_SRC
 ** create keypair from seed
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/src/main.c#L27][example]]
 #+BEGIN_SRC C
 void sr25519_keypair_from_seed(sr25519_keypair keypair, const sr25519_mini_secret_key seed);
 #+END_SRC
 ** sign message
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/src/main.c#L45][example]]
 #+BEGIN_SRC C
 void sr25519_sign(sr25519_signature signature, const sr25519_public_key public, const sr25519_secret_key secret, const uint8_t *message, unsigned long message_length);
 #+END_SRC
 ** verify message
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/src/main.c#L64][example]]
 #+BEGIN_SRC C
 bool sr25519_verify(const sr25519_signature signature, const uint8_t *message, unsigned long message_length, const sr25519_public_key public);
 #+END_SRC
 ** soft derive keypair
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/src/main.c#L77][example]]
 #+BEGIN_SRC C
 void sr25519_derive_keypair_soft(sr25519_keypair derived, const sr25519_keypair keypair, const sr25519_chain_code chain_code);
 #+END_SRC
 ** soft derive public key
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/src/main.c#L100][example]]
 #+BEGIN_SRC C
 void sr25519_derive_public_soft(sr25519_public_key derived_public, const sr25519_public_key public, const sr25519_chain_code chain_code);
 #+END_SRC
 ** hard derive keypair
+[[https://github.com/TerenceGe/sr25519-donna/blob/954fc1ff50aa919a05b23e28695dc92cab510467/example/src/main.c#L118][example]]
 #+BEGIN_SRC C
 void sr25519_derive_keypair_hard(sr25519_keypair derived, const sr25519_keypair keypair, const sr25519_chain_code chain_code);
 #+END_SRC

example/src/print.c

@@ -0,0 +1,8 @@
+#include "print.h"
+
+void print_hash(const uint8_t *hash, size_t len) {
+    for(int i = 0; i < len; i++) {
+        printf("%02x", hash[i]);
+    }
+    putchar( '\n' );
+}

example/src/print.h

@@ -0,0 +1,9 @@
+#ifndef __PRINT_H__
+#define __PRINT_H__
+
+#include <stdio.h>
+#include <stdint.h>
+
+void print_hash(const uint8_t *ptr, size_t len);
+
+#endif