create crypto_pow, in preparation for #3795

1 files changed, 13 insertions, 0 deletions

diff --git a/src/include/gnunet_crypto_lib.h b/src/include/gnunet_crypto_lib.h
index 507705e50..4a42c5c74 100644
--- a/src/include/gnunet_crypto_lib.h
+++ b/src/include/gnunet_crypto_lib.h
@@ -655,6 +655,19 @@ GNUNET_CRYPTO_hash (const void *block,
 
 
 /**
+ * Calculate the 'proof-of-work' hash (an expensive hash).
+ *
+ * @param buf data to hash
+ * @param buf_len number of bytes in @a buf
+ * @param result where to write the resulting hash
+ */
+void
+GNUNET_CRYPTO_pow_hash (const void *buf,
+                        size_t buf_len,
+                        struct GNUNET_HashCode *result);
+
+
+/**
  * Context for cummulative hashing.
  */
 struct GNUNET_HashContext;