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clarify comment

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This commit is contained in:
Dr. Stephen Henson 2010-06-16 13:15:31 +00:00
parent c8bbd98a2b
commit a7c64928c8
1 changed files with 7 additions and 4 deletions
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11
crypto/rand/md_rand.c
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@ -492,12 +492,15 @@ static int ssleay_rand_bytes(unsigned char *buf, int num)
goto err; goto err;
#ifndef PURIFY /* purify complains */ #ifndef PURIFY /* purify complains */
/* DO NOT REMOVE THE FOLLOWING CALL TO MD_Update()! */ /* The following line uses the supplied buffer as a small
* source of entropy: since this buffer is often uninitialised
* it may cause programs such as purify or valgrind to
* complain. So for those builds it is not used: the removal
* of such a small source of entropy has negligible impact on
* security.
*/
if (!MD_Update(&m,buf,j)) if (!MD_Update(&m,buf,j))
goto err; goto err;
/* We know that line may cause programs such as
purify and valgrind to complain about use of
uninitialized data. */
#endif #endif
k=(st_idx+MD_DIGEST_LENGTH/2)-st_num; k=(st_idx+MD_DIGEST_LENGTH/2)-st_num;