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update PRNG documentation/comments

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Bodo Möller
2000-01-22 23:11:13 +00:00
parent 2a99e8b9df
commit c88a900fa1
3 changed files with 20 additions and 16 deletions
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14
crypto/rand/md_rand.c
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@@ -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'