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libsec: add curve25519 and adjust ECpriv point access

--- a/libsec/Makefile

+++ b/libsec/Makefile

@@ -7,6 +7,7 @@

 	poly1305.$O chacha.$O chachablock.$O ccpoly.$O\

 	des.$O des3CBC.$O desmodes.$O\

 	ecc.$O jacobian.$O secp256k1.$O secp256r1.$O secp384r1.$O\

+	curve25519.$O curve25519_dh.$O\

 	genrandom.$O fastrand.$O nfastrand.$O prng.$O\

 	hmac.$O hkdf.$O pbkdf2.$O\

 	rsaalloc.$O rsadecrypt.$O rsaencrypt.$O\

--- a/libsec/tlshand.c

+++ b/libsec/tlshand.c

@@ -990,8 +990,8 @@

 			return nil;

 		memset(Q, 0, sizeof(*Q));

-		Q->x = mpnew(0);

-		Q->y = mpnew(0);

+		Q->a.x = mpnew(0);

+		Q->a.y = mpnew(0);

 		Q->d = mpnew(0);

 		memset(&K, 0, sizeof(K));

@@ -1004,7 +1004,7 @@

 		n = (mpsignif(dom->p)+7)/8;

 		setMasterSecret(sec, mptobytes(K.x, n));

 		Yc = newbytes(1 + 2*n);

-		Yc->len = ecencodepub(dom, Q, Yc->data, Yc->len);

+		Yc->len = ecencodepub(dom, &Q->a, Yc->data, Yc->len);

 		mpfree(K.x);

 		mpfree(K.y);

@@ -2084,8 +2084,8 @@

 	dh_finish(&c->sec->dh, nil);

-	mpfree(c->sec->ec.Q.x);

-	mpfree(c->sec->ec.Q.y);

+	mpfree(c->sec->ec.Q.a.x);

+	mpfree(c->sec->ec.Q.a.y);

 	mpfree(c->sec->ec.Q.d);

 	ecdomfree(&c->sec->ec.dom);

@@ -2559,8 +2559,8 @@

 	}else{

 		ecdominit(dom, sec->nc->init);

 		memset(Q, 0, sizeof(*Q));

-		Q->x = mpnew(0);

-		Q->y = mpnew(0);

+		Q->a.x = mpnew(0);

+		Q->a.y = mpnew(0);

 		Q->d = mpnew(0);

 		ecgen(dom, Q);

 		n = 1 + 2*((mpsignif(dom->p)+7)/8);

@@ -2567,7 +2567,7 @@

 		par = newbytes(1+2+1+n);

 		par->data[0] = 3;

 		put16(par->data+1, sec->nc->tlsid);

-		n = ecencodepub(dom, Q, par->data+4, par->len-4);

+		n = ecencodepub(dom, &Q->a, par->data+4, par->len-4);

 		par->data[3] = n;

 		par->len = 1+2+1+n;

 	}