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clarify comment

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This commit is contained in:
Dr. Stephen Henson 2010-06-16 13:17:22 +00:00
parent e97359435e
commit daac87be95
1 changed files with 7 additions and 4 deletions
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11
crypto/rand/md_rand.c
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@ -476,11 +476,14 @@ static int ssleay_rand_bytes(unsigned char *buf, int num)
MD_Update(&m,(unsigned char *)&(md_c[0]),sizeof(md_c)); MD_Update(&m,(unsigned char *)&(md_c[0]),sizeof(md_c));
#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.
*/
MD_Update(&m,buf,j); MD_Update(&m,buf,j);
/* 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;