X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;ds=inline;f=ucw%2Fdoc%2Fhash.txt;h=3e01b94156c23de6d9a79f7732f7992954787a89;hb=f501fcf311379b78506474478a17d82382b753e4;hp=bac3b9c9aeb1f3d44adc5ea6988f9ba243302052;hpb=b5b7b2641b00a18b53c48a1335846133f1d53168;p=libucw.git

diff --git a/ucw/doc/hash.txt b/ucw/doc/hash.txt
index bac3b9c9..3e01b941 100644
--- a/ucw/doc/hash.txt
+++ b/ucw/doc/hash.txt
@@ -6,33 +6,38 @@ Libucw contains two cryptographic hash algorithms: MD5 (RFC 1321) and SHA1 (RFC
 
 There are non-cryptographic hashes as well.
 
-Cryptographic ones
-------------------
+<<crypto,Cryptographic ones>>:
 
 - <<md5,MD5>>
 - <<sha1,SHA1>>
 - <<sha1:sha1_hmac(),SHA1_HMAC>>
 - <<usage,Common usage>>
 
-Non-cryptographic ones
-----------------------
+<<checksum,Checksums>>:
+- <<crypto:adler,Adler-32>>
+
+<<nocrypto,Non-cryptographic ones>>:
 
 - <<strhash,String & block hashes>>
 - <<inthash,Integer hashes>>
 
+[[crypto]]
+Cryptographic hashes
+--------------------
+
 [[md5]]
 MD5
----
+~~~
 !!ucw/md5.h
 
 [[sha1]]
 SHA1
-----
+~~~~
 !!ucw/sha1.h
 
 [[usage]]
 Common usage
-------------
+~~~~~~~~~~~~
 
 There are two ways you can use the hashing routines.
 
@@ -61,4 +66,23 @@ SHA1 has the same interface, so the same two ways apply.
 
 See also <<string:mem_to_hex()>>.
 
+[[checksum]]
+Checksums
+---------
+
+Their purpose is checking against random data changes, hardware
+failures and alike. They are not to be used against aimed attacks.
+
+The <<compress:adler,Adler-32 checksum>> is documented in the
+<<compression,compression capter>>.
+
+[[nocrypto]]
+Non-cryptographic hashes
+------------------------
+
+They are usually used to identify values in hash tables.
+
+All these functions expect to be moduled by the size of a hash table.
+The size should be a prime number (it gives better distribution).
+
 !!ucw/hashfunc.h