update PRNG documentation/comments

[openssl.git] / crypto / rand / md_rand.c

diff --git a/crypto/rand/md_rand.c b/crypto/rand/md_rand.c
index 2836a4d40976346cf9b409988a7a721a718a9a2a..88095b109d68f65e2644847e84be6a7268a7314e 100644 (file)
--- a/crypto/rand/md_rand.c
+++ b/crypto/rand/md_rand.c
@@ -186,7 +186,7 @@ static void ssleay_rand_add(const void *buf, int num, int add)
        /*
         * (Based on the rand(3) manpage)
         *
-        * The input is chopped up into units of 16 bytes (or less for
+        * The input is chopped up into units of 20 bytes (or less for
         * the last block).  Each of these blocks is run through the hash
         * function as follows:  The data passed to the hash function
         * is the current 'md', the same number of bytes from the 'state'
@@ -324,13 +324,15 @@ static int ssleay_rand_bytes(unsigned char *buf, int num)
        /*
         * (Based on the rand(3) manpage:)
         *
-        * For each group of 8 bytes (or less), we do the following:
+        * For each group of 10 bytes (or less), we do the following:
         *
-        * Input into the hash function the top 8 bytes from 'md', the bytes
-        * that are to be overwritten by the random bytes, and bytes from the
+        * Input into the hash function the top 10 bytes from the
+        * local 'md' (which is initialized from the global 'md'
+        * before any bytes are generated), the bytes that are
+        * to be overwritten by the random bytes, and bytes from the
         * 'state' (incrementing looping index).  From this digest output
-        * (which is kept in 'md'), the top (upto) 8 bytes are
-        * returned to the caller and the bottom (upto) 8 bytes are xored
+        * (which is kept in 'md'), the top (up to) 10 bytes are
+        * returned to the caller and the bottom (up to) 10 bytes are xored
         * into the 'state'.
         * Finally, after we have finished 'num' random bytes for the
         * caller, 'count' (which is incremented) and the local and global 'md'