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[openssl.git] / doc / crypto / rand.pod

diff --git a/doc/crypto/rand.pod b/doc/crypto/rand.pod
index a6dbf516b39278d611420c211d46d1814459caab..6d748c1bb67e3bd61ad6a9d41228ee32759bbe1a 100644 (file)
--- a/doc/crypto/rand.pod
+++ b/doc/crypto/rand.pod
@@ -101,12 +101,12 @@ the RNG state or the next random number.
 The algorithm is as follows.
 
 There is global state made up of a 1023 byte buffer (the 'state'), a
-working hash function ('md') and a counter ('count').
+working hash value ('md'), and a counter ('count').
 
 Whenever seed data is added, it is inserted into the 'state' as
 follows.
 
-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'
@@ -121,13 +121,15 @@ SHA-1), 3 (the 'state'), 4 (via the 'md'), 5 (by the use of a hash
 function and xor).
 
 When bytes are extracted from the RNG, the following process is used.
-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 'state'
-(incrementing looping index).  From this hash function output (which
-is kept in 'md'), the top (upto) 8 bytes are returned to the caller
-and the bottom (upto) 8 bytes are xored into the 'state'.
+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 (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' are fed
@@ -135,11 +137,11 @@ into the hash function and the results are kept in the global 'md'.
 
 I believe the above addressed points 1 (use of SHA-1), 6 (by hashing
 into the 'state' the 'old' data from the caller that is about to be
-overwritten) and 7 (by not using the 8 bytes given to the caller to
+overwritten) and 7 (by not using the 10 bytes given to the caller to
 update the 'state', but they are used to update 'md').
 
 So of the points raised, only 2 is not addressed (but see
-L<RAND_add()>).
+L<RAND_add(3)>).
 
 =head1 SEE ALSO