/**
* Calculate the 'proof-of-work' hash (an expensive hash).
*
+ * @param salt salt to use in pow calculation
* @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,
+GNUNET_CRYPTO_pow_hash (const char *salt,
+ const void *buf,
size_t buf_len,
struct GNUNET_HashCode *result);