fix typo

Author: kmyk

include/proofofwork.h

@@ -29,7 +29,7 @@ enum { pow_md5_digest_length = 16 };
 /**
  * @param [in]     mask       the length must be pow_md5_digest_length.
  * @param [in]     target     the length must be pow_md5_digest_length.
- * @param [in,out] buffer     the length must be pow_md5_digest_length.
+ * @param [in,out] buffer     the length must be at most pow_md5_block_length.
  * @param [in]     size
  * @param [in]     indices    indices of buffer to modify. the length must be pow_indices.
  * @return                    whether a text is found or not.

src/md5-avx2.c

@@ -38,7 +38,7 @@ bool pow_md5_mine(uint8_t const *mask, uint8_t const *target, uint8_t *buffer, u
         if (indices[i] < -1 or (int64_t)size <= indices[i]) return false;
     }
     if (indices[0] == -1) return false;
-    if (size > pow_sha1_block_length - sizeof(uint64_t) / CHAR_BIT - 1) return false;
+    if (size > pow_md5_block_length - sizeof(uint64_t) / CHAR_BIT - 1) return false;
 
     // load hash
     const uint32_t mask_a = ((uint32_t *)mask)[0];