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In fallback mode, use value of buffer to improve quality of hash.

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This commit is contained in:
Kurt Zeilenga 1999-10-27 19:42:27 +00:00
parent f804da9bef
commit c52dc059e6
1 changed files with 10 additions and 2 deletions
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12
libraries/liblutil/entropy.c
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@ -24,6 +24,10 @@
/*
* lutil_entropy() provides nbytes of entropy in buf.
* Quality offerred is suitable for one-time uses, such as "once" keys.
*
* Note: Callers are encouraged to provide additional bytes of
* of entropy in the buf argument. This information is used in
* fallback mode to improve the quality of bytes returned.
*/
int lutil_entropy( char *buf, int nbytes )
{
@ -75,7 +79,7 @@ int lutil_entropy( char *buf, int nbytes )
* MD5 is a strong cryptographic hash, this should
* be fairly resistant to attack
*/
static int counter = 0;
static sig_atomic_t counter = 0;
int n;
struct rdata_s {
@ -119,10 +123,14 @@ int lutil_entropy( char *buf, int nbytes )
lutil_MD5Init( &ctx );
lutil_MD5Update( &ctx, (char *) &rdata, sizeof( rdata ) );
/* use caller to provided information */
lutil_MD5Update( &ctx, (char *) &buf, nbytes );
lutil_MD5Final( digest, &ctx );
memcpy( &buf[n], digest,
nbytes - n > 16 ? 16 : nbytes - n );
nbytes - n >= 16 ? 16 : nbytes - n );
}
return 0;