KawPow WIP

src/3rdparty/libethash/ethash_internal.h

@@ -0,0 +1,192 @@
+#pragma once
+#include "endian.h"
+#include "ethash.h"
+#include <stdio.h>
+
+#define ENABLE_SSE 0
+
+#if defined(_M_X64) && ENABLE_SSE
+#include <smmintrin.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// compile time settings
+#define NODE_WORDS (64/4)
+#define MIX_WORDS (ETHASH_MIX_BYTES/4)
+#define MIX_NODES (MIX_WORDS / NODE_WORDS)
+#include <stdint.h>
+
+typedef union node {
+	uint8_t bytes[NODE_WORDS * 4];
+	uint32_t words[NODE_WORDS];
+	uint64_t double_words[NODE_WORDS / 2];
+
+#if defined(_M_X64) && ENABLE_SSE
+	__m128i xmm[NODE_WORDS/4];
+#endif
+
+} node;
+
+static inline uint8_t ethash_h256_get(ethash_h256_t const* hash, unsigned int i)
+{
+	return hash->b[i];
+}
+
+static inline void ethash_h256_set(ethash_h256_t* hash, unsigned int i, uint8_t v)
+{
+	hash->b[i] = v;
+}
+
+static inline void ethash_h256_reset(ethash_h256_t* hash)
+{
+	memset(hash, 0, 32);
+}
+
+// Returns if hash is less than or equal to boundary (2^256/difficulty)
+static inline bool ethash_check_difficulty(
+	ethash_h256_t const* hash,
+	ethash_h256_t const* boundary
+)
+{
+	// Boundary is big endian
+	for (int i = 0; i < 32; i++) {
+		if (ethash_h256_get(hash, i) == ethash_h256_get(boundary, i)) {
+			continue;
+		}
+		return ethash_h256_get(hash, i) < ethash_h256_get(boundary, i);
+	}
+	return true;
+}
+
+/**
+ *  Difficulty quick check for POW preverification
+ *
+ * @param header_hash      The hash of the header
+ * @param nonce            The block's nonce
+ * @param mix_hash         The mix digest hash
+ * @param boundary         The boundary is defined as (2^256 / difficulty)
+ * @return                 true for succesful pre-verification and false otherwise
+ */
+bool ethash_quick_check_difficulty(
+	ethash_h256_t const* header_hash,
+	uint64_t const nonce,
+	ethash_h256_t const* mix_hash,
+	ethash_h256_t const* boundary
+);
+
+struct ethash_light {
+	void* cache;
+	uint64_t cache_size;
+	uint64_t block_number;
+
+	// Used for fast division
+	uint32_t num_parent_nodes;
+	uint32_t reciprocal;
+	uint32_t increment;
+	uint32_t shift;
+};
+
+/**
+ * Allocate and initialize a new ethash_light handler. Internal version
+ *
+ * @param cache_size    The size of the cache in bytes
+ * @param seed          Block seedhash to be used during the computation of the
+ *                      cache nodes
+ * @return              Newly allocated ethash_light handler or NULL in case of
+ *                      ERRNOMEM or invalid parameters used for @ref ethash_compute_cache_nodes()
+ */
+ethash_light_t ethash_light_new_internal(uint64_t cache_size, ethash_h256_t const* seed);
+
+/**
+ * Calculate the light client data. Internal version.
+ *
+ * @param light          The light client handler
+ * @param full_size      The size of the full data in bytes.
+ * @param header_hash    The header hash to pack into the mix
+ * @param nonce          The nonce to pack into the mix
+ * @return               The resulting hash.
+ */
+ethash_return_value_t ethash_light_compute_internal(
+	ethash_light_t light,
+	uint64_t full_size,
+	ethash_h256_t const header_hash,
+	uint64_t nonce
+);
+
+struct ethash_full {
+	FILE* file;
+	uint64_t file_size;
+	node* data;
+};
+
+/**
+ * Allocate and initialize a new ethash_full handler. Internal version.
+ *
+ * @param dirname        The directory in which to put the DAG file.
+ * @param seedhash       The seed hash of the block. Used in the DAG file naming.
+ * @param full_size      The size of the full data in bytes.
+ * @param cache          A cache object to use that was allocated with @ref ethash_cache_new().
+ *                       Iff this function succeeds the ethash_full_t will take memory
+ *                       memory ownership of the cache and free it at deletion. If
+ *                       not then the user still has to handle freeing of the cache himself.
+ * @param callback       A callback function with signature of @ref ethash_callback_t
+ *                       It accepts an unsigned with which a progress of DAG calculation
+ *                       can be displayed. If all goes well the callback should return 0.
+ *                       If a non-zero value is returned then DAG generation will stop.
+ * @return               Newly allocated ethash_full handler or NULL in case of
+ *                       ERRNOMEM or invalid parameters used for @ref ethash_compute_full_data()
+ */
+ethash_full_t ethash_full_new_internal(
+	char const* dirname,
+	ethash_h256_t const seed_hash,
+	uint64_t full_size,
+	ethash_light_t const light,
+	ethash_callback_t callback
+);
+
+void ethash_calculate_dag_item(
+	node* const ret,
+	uint32_t node_index,
+	uint32_t num_parents,
+	ethash_light_t const cache
+);
+
+void ethash_calculate_dag_item_opt(
+	node* const ret,
+	uint32_t node_index,
+	uint32_t num_parents,
+	ethash_light_t const cache
+);
+
+void ethash_quick_hash(
+	ethash_h256_t* return_hash,
+	ethash_h256_t const* header_hash,
+	const uint64_t nonce,
+	ethash_h256_t const* mix_hash
+);
+
+uint64_t ethash_get_datasize(uint64_t const block_number);
+uint64_t ethash_get_cachesize(uint64_t const block_number);
+
+/**
+ * Compute the memory data for a full node's memory
+ *
+ * @param mem         A pointer to an ethash full's memory
+ * @param full_size   The size of the full data in bytes
+ * @param cache       A cache object to use in the calculation
+ * @param callback    The callback function. Check @ref ethash_full_new() for details.
+ * @return            true if all went fine and false for invalid parameters
+ */
+bool ethash_compute_full_data(
+	void* mem,
+	uint64_t full_size,
+	ethash_light_t const light,
+	ethash_callback_t callback
+);
+
+#ifdef __cplusplus
+}
+#endif