create crypto_pow, in preparation for #3795

1 files changed, 2 insertions, 25 deletions

diff --git a/src/nse/gnunet-service-nse.c b/src/nse/gnunet-service-nse.c
index 3e72be1c5..3f04314a6 100644
--- a/src/nse/gnunet-service-nse.c
+++ b/src/nse/gnunet-service-nse.c
@@ -488,29 +488,6 @@ get_delay_randomization (uint32_t matching_bits)
 
 
 /**
- * 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
- */
-static void
-pow_hash (const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
-{
-  GNUNET_break (
-    0 == gcry_kdf_derive (buf,
-                          buf_len,
-                          GCRY_KDF_SCRYPT,
-                          1 /* subalgo */,
-                          "gnunet-proof-of-work",
-                          strlen ("gnunet-proof-of-work"),
-                          2 /* iterations; keep cost of individual op small */,
-                          sizeof(struct GNUNET_HashCode),
-                          result));
-}
-
-
-/**
  * Get the number of matching bits that the given timestamp has to the given peer ID.
  *
  * @param timestamp time to generate key
@@ -828,7 +805,7 @@ check_proof_of_work (const struct GNUNET_CRYPTO_EddsaPublicKey *pkey,
   GNUNET_memcpy (&buf[sizeof(val)],
                  pkey,
                  sizeof(struct GNUNET_CRYPTO_EddsaPublicKey));
-  pow_hash (buf, sizeof(buf), &result);
+  GNUNET_CRYPTO_pow_hash (buf, sizeof(buf), &result);
   return (count_leading_zeroes (&result) >= nse_work_required) ? GNUNET_YES
          : GNUNET_NO;
 }
@@ -880,7 +857,7 @@ find_proof (void *cls)
   while ((counter != UINT64_MAX) && (i < ROUND_SIZE))
   {
     GNUNET_memcpy (buf, &counter, sizeof(uint64_t));
-    pow_hash (buf, sizeof(buf), &result);
+    GNUNET_CRYPTO_pow_hash (buf, sizeof(buf), &result);
     if (nse_work_required <= count_leading_zeroes (&result))
     {
       my_proof = counter;