X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/8276a9c565bc29afbc6cc120dfde0801c06c2bbd..7b0d1a63587f3cb1ae3bb8b248bbb1b82bdca7bd:/pub/ed448.c

diff --git a/pub/ed448.c b/pub/ed448.c
index a3a94214..60328021 100644
--- a/pub/ed448.c
+++ b/pub/ed448.c
@@ -237,7 +237,7 @@ static void ptdbl(fgoldi *X, fgoldi *Y, fgoldi *Z,
   fgoldi_sub(&t1, &t1, &t2);		/* t1 = C - D */
   fgoldi_sub(X, &t0, Y);		/* X = c (B - E) */
   fgoldi_sqr(&t0, Z0);			/* t0 = H = (c Z0)^2 */
-  fgoldi_mulconst(&t0, &t0, 2);		/* t0 = 2 H */
+  fgoldi_add(&t0, &t0, &t0);		/* t0 = 2 H */
   fgoldi_sub(&t0, Y, &t0);		/* t0 = J = E - 2 H */
   fgoldi_mul(X, X, &t0);		/* X = c (B - E) J */
   fgoldi_mul(Z, Y, &t0);		/* Z = E J */
@@ -317,7 +317,7 @@ void ed448_sign(octet sig[ED448_SIGSZ],
 		const void *m, size_t msz)
 {
   shake_ctx h;
-  scaf_piece a[NPIECE], r[NPIECE], t[NPIECE], scratch[3*NPIECE + 1];
+  scaf_piece a[NPIECE], r[NPIECE], t[NPIECE], scratch[3*NPIECE];
   scaf_dblpiece tt[2*NPIECE];
   fgoldi RX, RY, RZ;
   octet h1[57], pb[PREFIX_BUFSZ], rb[114];
@@ -376,7 +376,7 @@ int ed448_verify(const octet K[ED448_PUBSZ],
 		 const octet sig[ED448_SIGSZ])
 {
   shake_ctx h;
-  scaf_piece s[NPIECE], t[NPIECE], scratch[3*NPIECE + 1];
+  scaf_piece s[NPIECE], t[NPIECE], scratch[3*NPIECE];
   scaf_dblpiece tt[2*NPIECE];
   fgoldi AX, AY, AZ, RX, RY, RZ;
   octet b[PREFIX_BUFSZ];
@@ -424,6 +424,8 @@ int ed448_verify(const octet K[ED448_PUBSZ],
 #include <mLib/report.h>
 #include <mLib/testrig.h>
 
+#include "ct.h"
+
 static int vrf_pubkey(dstr dv[])
 {
   dstr dpub = DSTR_INIT;
@@ -431,8 +433,10 @@ static int vrf_pubkey(dstr dv[])
 
   if (dv[1].len != ED448_PUBSZ) die(1, "bad pub length");
 
+  ct_poison(dv[0].buf, dv[0].len);
   dstr_ensure(&dpub, ED448_PUBSZ); dpub.len = ED448_PUBSZ;
   ed448_pubkey((octet *)dpub.buf, dv[0].buf, dv[0].len);
+  ct_remedy(dpub.buf, dpub.len);
   if (memcmp(dpub.buf, dv[1].buf, ED448_PUBSZ) != 0) {
     ok = 0;
     fprintf(stderr, "failed!");
@@ -456,6 +460,7 @@ static int vrf_sign(dstr *priv, int phflag, dstr *perso,
 
   if (want->len != ED448_SIGSZ) die(1, "bad result length");
 
+  ct_poison(priv->buf, priv->len);
   dstr_ensure(&dsig, ED448_SIGSZ); dsig.len = ED448_SIGSZ;
   if (phflag <= 0)
     m = msg;
@@ -470,6 +475,7 @@ static int vrf_sign(dstr *priv, int phflag, dstr *perso,
   ed448_sign((octet *)dsig.buf, priv->buf, priv->len, K,
 	     phflag, perso ? perso->buf : 0, perso ? perso->len : 0,
 	     m->buf, m->len);
+  ct_remedy(dsig.buf, dsig.len);
   if (memcmp(dsig.buf, want->buf, ED448_SIGSZ) != 0) {
     ok = 0;
     fprintf(stderr, "failed!");