First commit, Vystem v0.1

Blastproof/initfsgen/utils.h

@@ -0,0 +1,64 @@
+#ifndef SPX_UTILS_H
+#define SPX_UTILS_H
+
+#include <stdint.h>
+#include "params.h"
+#include "context.h"
+
+
+/* To support MSVC use alloca() instead of VLAs. See #20. */
+#ifdef _MSC_VER
+/* MSVC defines _alloca in malloc.h */
+# include <malloc.h>
+/* Note: _malloca(), which is recommended over deprecated _alloca,
+   requires that you call _freea(). So we stick with _alloca */ 
+# define SPX_VLA(__t,__x,__s) __t *__x = (__t*)_alloca((__s)*sizeof(__t))
+#else
+# define SPX_VLA(__t,__x,__s) __t __x[__s]
+#endif
+
+/**
+ * Converts the value of 'in' to 'outlen' bytes in big-endian byte order.
+ */
+#define ull_to_bytes SPX_NAMESPACE(ull_to_bytes)
+void ull_to_bytes(unsigned char *out, unsigned int outlen,
+                  unsigned long long in);
+#define u32_to_bytes SPX_NAMESPACE(u32_to_bytes)
+void u32_to_bytes(unsigned char *out, uint32_t in);
+
+/**
+ * Converts the inlen bytes in 'in' from big-endian byte order to an integer.
+ */
+#define bytes_to_ull SPX_NAMESPACE(bytes_to_ull)
+unsigned long long bytes_to_ull(const unsigned char *in, unsigned int inlen);
+
+/**
+ * Computes a root node given a leaf and an auth path.
+ * Expects address to be complete other than the tree_height and tree_index.
+ */
+#define compute_root SPX_NAMESPACE(compute_root)
+void compute_root(unsigned char *root, const unsigned char *leaf,
+                  uint32_t leaf_idx, uint32_t idx_offset,
+                  const unsigned char *auth_path, uint32_t tree_height,
+                  const spx_ctx *ctx, uint32_t addr[8]);
+
+/**
+ * For a given leaf index, computes the authentication path and the resulting
+ * root node using Merkle's TreeHash algorithm.
+ * Expects the layer and tree parts of the tree_addr to be set, as well as the
+ * tree type (i.e. SPX_ADDR_TYPE_HASHTREE or SPX_ADDR_TYPE_FORSTREE).
+ * Applies the offset idx_offset to indices before building addresses, so that
+ * it is possible to continue counting indices across trees.
+ */
+#define treehash SPX_NAMESPACE(treehash)
+void treehash(unsigned char *root, unsigned char *auth_path,
+              const spx_ctx* ctx,
+              uint32_t leaf_idx, uint32_t idx_offset, uint32_t tree_height,
+              void (*gen_leaf)(
+                 unsigned char* /* leaf */,
+                 const spx_ctx* ctx /* ctx */,
+                 uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */),
+              uint32_t tree_addr[8]);
+
+
+#endif