ProgPoW spec v0.9.1

 * and support progpow_light_compute()
 * remove duplication codes.
 * fixed misc bugs.
 * See also:
   - chfast/ethash#108
   - ethereum/go-ethereum#17731
   - https://github.com/ifdefelse/cpp-ethereum/tree/a998c9e9335f4f8bfc89a4f9598d1cce8fad3330

src/libethash/ethash.h

@@ -46,6 +46,11 @@
 extern "C" {
 #endif
 
+typedef struct
+{
+	uint32_t uint32s[32 / sizeof(uint32_t)];
+} hash32_t;
+
 /// Type of a seedhash/blockhash e.t.c.
 typedef struct ethash_h256 { uint8_t b[32]; } ethash_h256_t;
 
@@ -132,7 +137,23 @@ ethash_return_value_t ethash_full_compute(
 );
 
 /**
- * Calculate the full client data
+ * Calculate the light client data of the ProgPow
+ *
+ * @param light          The light client handler
+ * @param header_hash    The header hash to pack into the mix
+ * @param nonce          The nonce to pack into the mix
+ * @param block_number   The block_number
+ * @return               an object of ethash_return_value_t holding the return values
+ */
+ethash_return_value_t progpow_light_compute(
+	ethash_light_t light,
+	ethash_h256_t const header_hash,
+	uint64_t nonce,
+	uint64_t block_number
+);
+
+/**
+ * Calculate the full client data of the ProgPoW
  *
  * @param full           The full client handler
  * @param header_hash    The header hash to pack into the mix

src/libethash/internal.h

@@ -106,6 +106,7 @@ ethash_light_t ethash_light_new_internal(uint64_t cache_size, ethash_h256_t cons
  * @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
+ * @param block_number   The block_number
  * @return               The resulting hash.
  */
 ethash_return_value_t ethash_light_compute_internal(
@@ -115,6 +116,29 @@ ethash_return_value_t ethash_light_compute_internal(
 	uint64_t nonce
 );
 
+void keccak_f800_round(uint32_t st[25], const int r);
+uint64_t keccak_f800(hash32_t header, uint64_t seed, uint32_t *result);
+uint32_t progpowMath(uint32_t a, uint32_t b, uint32_t r);
+void merge(uint32_t *a, uint32_t b, uint32_t r);
+
+/**
+ * Calculate the light client data of the ProgPow. 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
+ * @param block_number   The block_number
+ * @return               The resulting hash.
+ */
+ethash_return_value_t progpow_light_compute_internal(
+	ethash_light_t light,
+	uint64_t full_size,
+	ethash_h256_t const header_hash,
+	uint64_t nonce,
+	uint64_t block_number
+);
+
 struct ethash_full {
 	FILE* file;
 	uint64_t file_size;