Build wallet with Android NDK

src/crypto/CMakeLists.txt

@@ -89,3 +89,14 @@ if (ARM)
       PROPERTY COMPILE_DEFINITIONS "NO_OPTIMIZED_MULTIPLY_ON_ARM")
   endif()
 endif()
+
+# Because of the way Qt works on android with JNI, the code does not live in the main android thread
+# So this code runs with a 1 MB default stack size. 
+# This will force the use of the heap for the allocation of the scratchpad
+if (ANDROID)
+  if( BUILD_GUI_DEPS )
+    add_definitions(-DFORCE_USE_HEAP=1)
+  endif()
+endif()
+
+

src/crypto/oaes_lib.c

@@ -39,8 +39,8 @@
  #include <malloc.h>
 #endif
 
-// FreeBSD, and OpenBSD also don't need timeb.h
-#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
+// ANDROID, FreeBSD, and OpenBSD also don't need timeb.h
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__ANDROID__)
  #include <sys/timeb.h>
 #else
  #include <sys/time.h>
@@ -499,7 +499,7 @@ static void oaes_get_seed( char buf[RANDSIZ + 1] )
 #else
 static uint32_t oaes_get_seed(void)
 {
-        #if !defined(__FreeBSD__) && !defined(__OpenBSD__)
+        #if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__ANDROID__)
 	struct timeb timer;
 	struct tm *gmTimer;
 	char * _test = NULL;

src/crypto/slow-hash.c

@@ -1052,7 +1052,6 @@ STATIC INLINE void xor_blocks(uint8_t* a, const uint8_t* b)
 
 void cn_slow_hash(const void *data, size_t length, char *hash)
 {
-    uint8_t long_state[MEMORY];
     uint8_t text[INIT_SIZE_BYTE];
     uint8_t a[AES_BLOCK_SIZE];
     uint8_t b[AES_BLOCK_SIZE];
@@ -1070,6 +1069,13 @@ void cn_slow_hash(const void *data, size_t length, char *hash)
         hash_extra_blake, hash_extra_groestl, hash_extra_jh, hash_extra_skein
     };
 
+#ifndef FORCE_USE_HEAP
+    uint8_t long_state[MEMORY];
+#else
+    uint8_t *long_state = NULL;
+    long_state = (uint8_t *)malloc(MEMORY);
+#endif
+
     hash_process(&state.hs, data, length);
     memcpy(text, state.init, INIT_SIZE_BYTE);
 
@@ -1129,6 +1135,9 @@ void cn_slow_hash(const void *data, size_t length, char *hash)
     memcpy(state.init, text, INIT_SIZE_BYTE);
     hash_permutation(&state.hs);
     extra_hashes[state.hs.b[0] & 3](&state, 200, hash);
+#ifdef FORCE_USE_HEAP
+    free(long_state);
+#endif
 }
 #endif /* !aarch64 || !crypto */