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8168724: ECDSA signing improvments

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Reviewed-by: valeriep, vinnie, ahgross, asmotrak, robm
This commit is contained in:
Xue-Lei Andrew Fan 2016-11-10 15:52:48 +00:00
parent ec3a122b19
commit fc58c85eb4
1 changed files with 11 additions and 1 deletions
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12
jdk/src/jdk.crypto.ec/share/native/libsunec/impl/ec.c
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@ -34,7 +34,7 @@
* Dr Vipul Gupta <vipul.gupta@sun.com> and
* Douglas Stebila <douglas@stebila.ca>, Sun Microsystems Laboratories
*
* Last Modified Date from the Original Code: Nov 2016
* Last Modified Date from the Original Code: November 2016
*********************************************************************** */
#include "mplogic.h"
@ -714,6 +714,16 @@ ECDSA_SignDigestWithSeed(ECPrivateKey *key, SECItem *signature,
goto cleanup;
}
/*
* Using an equivalent exponent of fixed length (same as n or 1 bit less
* than n) to keep the kG timing relatively constant.
*
* Note that this is an extra step on top of the approach defined in
* ANSI X9.62 so as to make a fixed length K.
*/
CHECK_MPI_OK( mp_add(&k, &n, &k) );
CHECK_MPI_OK( mp_div_2(&k, &k) );
/*
** ANSI X9.62, Section 5.3.2, Step 2
**