Tarball conversion

1 files changed, 369 insertions, 0 deletions

diff --git a/mozilla/security/nss/lib/freebl/ecl/ec2_proj.c b/mozilla/security/nss/lib/freebl/ecl/ec2_proj.c
new file mode 100644
index 0000000..340e47d
--- /dev/null
+++ b/mozilla/security/nss/lib/freebl/ecl/ec2_proj.c
@@ -0,0 +1,369 @@
+/* 
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the elliptic curve math library for binary polynomial field curves.
+ *
+ * The Initial Developer of the Original Code is
+ * Sun Microsystems, Inc.
+ * Portions created by the Initial Developer are Copyright (C) 2003
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Sheueling Chang-Shantz <sheueling.chang@sun.com>,
+ *   Stephen Fung <fungstep@hotmail.com>, and
+ *   Douglas Stebila <douglas@stebila.ca>, Sun Microsystems Laboratories.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "ec2.h"
+#include "mplogic.h"
+#include "mp_gf2m.h"
+#include <stdlib.h>
+#ifdef ECL_DEBUG
+#include <assert.h>
+#endif
+
+/* by default, these routines are unused and thus don't need to be compiled */
+#ifdef ECL_ENABLE_GF2M_PROJ
+/* Converts a point P(px, py) from affine coordinates to projective
+ * coordinates R(rx, ry, rz). Assumes input is already field-encoded using 
+ * field_enc, and returns output that is still field-encoded. */
+mp_err
+ec_GF2m_pt_aff2proj(const mp_int *px, const mp_int *py, mp_int *rx,
+					mp_int *ry, mp_int *rz, const ECGroup *group)
+{
+	mp_err res = MP_OKAY;
+
+	MP_CHECKOK(mp_copy(px, rx));
+	MP_CHECKOK(mp_copy(py, ry));
+	MP_CHECKOK(mp_set_int(rz, 1));
+	if (group->meth->field_enc) {
+		MP_CHECKOK(group->meth->field_enc(rz, rz, group->meth));
+	}
+  CLEANUP:
+	return res;
+}
+
+/* Converts a point P(px, py, pz) from projective coordinates to affine
+ * coordinates R(rx, ry).  P and R can share x and y coordinates. Assumes
+ * input is already field-encoded using field_enc, and returns output that
+ * is still field-encoded. */
+mp_err
+ec_GF2m_pt_proj2aff(const mp_int *px, const mp_int *py, const mp_int *pz,
+					mp_int *rx, mp_int *ry, const ECGroup *group)
+{
+	mp_err res = MP_OKAY;
+	mp_int z1, z2;
+
+	MP_DIGITS(&z1) = 0;
+	MP_DIGITS(&z2) = 0;
+	MP_CHECKOK(mp_init(&z1));
+	MP_CHECKOK(mp_init(&z2));
+
+	/* if point at infinity, then set point at infinity and exit */
+	if (ec_GF2m_pt_is_inf_proj(px, py, pz) == MP_YES) {
+		MP_CHECKOK(ec_GF2m_pt_set_inf_aff(rx, ry));
+		goto CLEANUP;
+	}
+
+	/* transform (px, py, pz) into (px / pz, py / pz^2) */
+	if (mp_cmp_d(pz, 1) == 0) {
+		MP_CHECKOK(mp_copy(px, rx));
+		MP_CHECKOK(mp_copy(py, ry));
+	} else {
+		MP_CHECKOK(group->meth->field_div(NULL, pz, &z1, group->meth));
+		MP_CHECKOK(group->meth->field_sqr(&z1, &z2, group->meth));
+		MP_CHECKOK(group->meth->field_mul(px, &z1, rx, group->meth));
+		MP_CHECKOK(group->meth->field_mul(py, &z2, ry, group->meth));
+	}
+
+  CLEANUP:
+	mp_clear(&z1);
+	mp_clear(&z2);
+	return res;
+}
+
+/* Checks if point P(px, py, pz) is at infinity. Uses projective
+ * coordinates. */
+mp_err
+ec_GF2m_pt_is_inf_proj(const mp_int *px, const mp_int *py,
+					   const mp_int *pz)
+{
+	return mp_cmp_z(pz);
+}
+
+/* Sets P(px, py, pz) to be the point at infinity.  Uses projective
+ * coordinates. */
+mp_err
+ec_GF2m_pt_set_inf_proj(mp_int *px, mp_int *py, mp_int *pz)
+{
+	mp_zero(pz);
+	return MP_OKAY;
+}
+
+/* Computes R = P + Q where R is (rx, ry, rz), P is (px, py, pz) and Q is
+ * (qx, qy, 1).  Elliptic curve points P, Q, and R can all be identical.
+ * Uses mixed projective-affine coordinates. Assumes input is already
+ * field-encoded using field_enc, and returns output that is still
+ * field-encoded. Uses equation (3) from Hankerson, Hernandez, Menezes.
+ * Software Implementation of Elliptic Curve Cryptography Over Binary
+ * Fields. */
+mp_err
+ec_GF2m_pt_add_proj(const mp_int *px, const mp_int *py, const mp_int *pz,
+					const mp_int *qx, const mp_int *qy, mp_int *rx,
+					mp_int *ry, mp_int *rz, const ECGroup *group)
+{
+	mp_err res = MP_OKAY;
+	mp_int A, B, C, D, E, F, G;
+
+	/* If either P or Q is the point at infinity, then return the other
+	 * point */
+	if (ec_GF2m_pt_is_inf_proj(px, py, pz) == MP_YES) {
+		return ec_GF2m_pt_aff2proj(qx, qy, rx, ry, rz, group);
+	}
+	if (ec_GF2m_pt_is_inf_aff(qx, qy) == MP_YES) {
+		MP_CHECKOK(mp_copy(px, rx));
+		MP_CHECKOK(mp_copy(py, ry));
+		return mp_copy(pz, rz);
+	}
+
+	MP_DIGITS(&A) = 0;
+	MP_DIGITS(&B) = 0;
+	MP_DIGITS(&C) = 0;
+	MP_DIGITS(&D) = 0;
+	MP_DIGITS(&E) = 0;
+	MP_DIGITS(&F) = 0;
+	MP_DIGITS(&G) = 0;
+	MP_CHECKOK(mp_init(&A));
+	MP_CHECKOK(mp_init(&B));
+	MP_CHECKOK(mp_init(&C));
+	MP_CHECKOK(mp_init(&D));
+	MP_CHECKOK(mp_init(&E));
+	MP_CHECKOK(mp_init(&F));
+	MP_CHECKOK(mp_init(&G));
+
+	/* D = pz^2 */
+	MP_CHECKOK(group->meth->field_sqr(pz, &D, group->meth));
+
+	/* A = qy * pz^2 + py */
+	MP_CHECKOK(group->meth->field_mul(qy, &D, &A, group->meth));
+	MP_CHECKOK(group->meth->field_add(&A, py, &A, group->meth));
+
+	/* B = qx * pz + px */
+	MP_CHECKOK(group->meth->field_mul(qx, pz, &B, group->meth));
+	MP_CHECKOK(group->meth->field_add(&B, px, &B, group->meth));
+
+	/* C = pz * B */
+	MP_CHECKOK(group->meth->field_mul(pz, &B, &C, group->meth));
+
+	/* D = B^2 * (C + a * pz^2) (using E as a temporary variable) */
+	MP_CHECKOK(group->meth->
+			   field_mul(&group->curvea, &D, &D, group->meth));
+	MP_CHECKOK(group->meth->field_add(&C, &D, &D, group->meth));
+	MP_CHECKOK(group->meth->field_sqr(&B, &E, group->meth));
+	MP_CHECKOK(group->meth->field_mul(&E, &D, &D, group->meth));
+
+	/* rz = C^2 */
+	MP_CHECKOK(group->meth->field_sqr(&C, rz, group->meth));
+
+	/* E = A * C */
+	MP_CHECKOK(group->meth->field_mul(&A, &C, &E, group->meth));
+
+	/* rx = A^2 + D + E */
+	MP_CHECKOK(group->meth->field_sqr(&A, rx, group->meth));
+	MP_CHECKOK(group->meth->field_add(rx, &D, rx, group->meth));
+	MP_CHECKOK(group->meth->field_add(rx, &E, rx, group->meth));
+
+	/* F = rx + qx * rz */
+	MP_CHECKOK(group->meth->field_mul(qx, rz, &F, group->meth));
+	MP_CHECKOK(group->meth->field_add(rx, &F, &F, group->meth));
+
+	/* G = rx + qy * rz */
+	MP_CHECKOK(group->meth->field_mul(qy, rz, &G, group->meth));
+	MP_CHECKOK(group->meth->field_add(rx, &G, &G, group->meth));
+
+	/* ry = E * F + rz * G (using G as a temporary variable) */
+	MP_CHECKOK(group->meth->field_mul(rz, &G, &G, group->meth));
+	MP_CHECKOK(group->meth->field_mul(&E, &F, ry, group->meth));
+	MP_CHECKOK(group->meth->field_add(ry, &G, ry, group->meth));
+
+  CLEANUP:
+	mp_clear(&A);
+	mp_clear(&B);
+	mp_clear(&C);
+	mp_clear(&D);
+	mp_clear(&E);
+	mp_clear(&F);
+	mp_clear(&G);
+	return res;
+}
+
+/* Computes R = 2P.  Elliptic curve points P and R can be identical.  Uses 
+ * projective coordinates.
+ *
+ * Assumes input is already field-encoded using field_enc, and returns 
+ * output that is still field-encoded.
+ *
+ * Uses equation (3) from Hankerson, Hernandez, Menezes. Software 
+ * Implementation of Elliptic Curve Cryptography Over Binary Fields.
+ */
+mp_err
+ec_GF2m_pt_dbl_proj(const mp_int *px, const mp_int *py, const mp_int *pz,
+					mp_int *rx, mp_int *ry, mp_int *rz,
+					const ECGroup *group)
+{
+	mp_err res = MP_OKAY;
+	mp_int t0, t1;
+
+	if (ec_GF2m_pt_is_inf_proj(px, py, pz) == MP_YES) {
+		return ec_GF2m_pt_set_inf_proj(rx, ry, rz);
+	}
+
+	MP_DIGITS(&t0) = 0;
+	MP_DIGITS(&t1) = 0;
+	MP_CHECKOK(mp_init(&t0));
+	MP_CHECKOK(mp_init(&t1));
+
+	/* t0 = px^2 */
+	/* t1 = pz^2 */
+	MP_CHECKOK(group->meth->field_sqr(px, &t0, group->meth));
+	MP_CHECKOK(group->meth->field_sqr(pz, &t1, group->meth));
+
+	/* rz = px^2 * pz^2 */
+	MP_CHECKOK(group->meth->field_mul(&t0, &t1, rz, group->meth));
+
+	/* t0 = px^4 */
+	/* t1 = b * pz^4 */
+	MP_CHECKOK(group->meth->field_sqr(&t0, &t0, group->meth));
+	MP_CHECKOK(group->meth->field_sqr(&t1, &t1, group->meth));
+	MP_CHECKOK(group->meth->
+			   field_mul(&group->curveb, &t1, &t1, group->meth));
+
+	/* rx = px^4 + b * pz^4 */
+	MP_CHECKOK(group->meth->field_add(&t0, &t1, rx, group->meth));
+
+	/* ry = b * pz^4 * rz + rx * (a * rz + py^2 + b * pz^4) */
+	MP_CHECKOK(group->meth->field_sqr(py, ry, group->meth));
+	MP_CHECKOK(group->meth->field_add(ry, &t1, ry, group->meth));
+	/* t0 = a * rz */
+	MP_CHECKOK(group->meth->
+			   field_mul(&group->curvea, rz, &t0, group->meth));
+	MP_CHECKOK(group->meth->field_add(&t0, ry, ry, group->meth));
+	MP_CHECKOK(group->meth->field_mul(rx, ry, ry, group->meth));
+	/* t1 = b * pz^4 * rz */
+	MP_CHECKOK(group->meth->field_mul(&t1, rz, &t1, group->meth));
+	MP_CHECKOK(group->meth->field_add(&t1, ry, ry, group->meth));
+
+  CLEANUP:
+	mp_clear(&t0);
+	mp_clear(&t1);
+	return res;
+}
+
+/* Computes R = nP where R is (rx, ry) and P is (px, py). The parameters
+ * a, b and p are the elliptic curve coefficients and the prime that
+ * determines the field GF2m.  Elliptic curve points P and R can be
+ * identical.  Uses mixed projective-affine coordinates. Assumes input is
+ * already field-encoded using field_enc, and returns output that is still
+ * field-encoded. Uses 4-bit window method. */
+mp_err
+ec_GF2m_pt_mul_proj(const mp_int *n, const mp_int *px, const mp_int *py,
+					mp_int *rx, mp_int *ry, const ECGroup *group)
+{
+	mp_err res = MP_OKAY;
+	mp_int precomp[16][2], rz;
+	mp_digit precomp_arr[ECL_MAX_FIELD_SIZE_DIGITS * 16 * 2], *t;
+	int i, ni, d;
+
+	ARGCHK(group != NULL, MP_BADARG);
+	ARGCHK((n != NULL) && (px != NULL) && (py != NULL), MP_BADARG);
+
+	/* initialize precomputation table */
+	t = precomp_arr;
+	for (i = 0; i < 16; i++) {
+		/* x co-ord */
+		MP_SIGN(&precomp[i][0]) = MP_ZPOS;
+		MP_ALLOC(&precomp[i][0]) = ECL_MAX_FIELD_SIZE_DIGITS;
+		MP_USED(&precomp[i][0]) = 1;
+		*t = 0;
+		MP_DIGITS(&precomp[i][0]) = t;
+		t += ECL_MAX_FIELD_SIZE_DIGITS;
+		/* y co-ord */
+		MP_SIGN(&precomp[i][1]) = MP_ZPOS;
+		MP_ALLOC(&precomp[i][1]) = ECL_MAX_FIELD_SIZE_DIGITS;
+		MP_USED(&precomp[i][1]) = 1;
+		*t = 0;
+		MP_DIGITS(&precomp[i][1]) = t;
+		t += ECL_MAX_FIELD_SIZE_DIGITS;
+	}
+
+	/* fill precomputation table */
+	mp_zero(&precomp[0][0]);
+	mp_zero(&precomp[0][1]);
+	MP_CHECKOK(mp_copy(px, &precomp[1][0]));
+	MP_CHECKOK(mp_copy(py, &precomp[1][1]));
+	for (i = 2; i < 16; i++) {
+		MP_CHECKOK(group->
+				   point_add(&precomp[1][0], &precomp[1][1],
+							 &precomp[i - 1][0], &precomp[i - 1][1],
+							 &precomp[i][0], &precomp[i][1], group));
+	}
+
+	d = (mpl_significant_bits(n) + 3) / 4;
+
+	/* R = inf */
+	MP_DIGITS(&rz) = 0;
+	MP_CHECKOK(mp_init(&rz));
+	MP_CHECKOK(ec_GF2m_pt_set_inf_proj(rx, ry, &rz));
+
+	for (i = d - 1; i >= 0; i--) {
+		/* compute window ni */
+		ni = MP_GET_BIT(n, 4 * i + 3);
+		ni <<= 1;
+		ni |= MP_GET_BIT(n, 4 * i + 2);
+		ni <<= 1;
+		ni |= MP_GET_BIT(n, 4 * i + 1);
+		ni <<= 1;
+		ni |= MP_GET_BIT(n, 4 * i);
+		/* R = 2^4 * R */
+		MP_CHECKOK(ec_GF2m_pt_dbl_proj(rx, ry, &rz, rx, ry, &rz, group));
+		MP_CHECKOK(ec_GF2m_pt_dbl_proj(rx, ry, &rz, rx, ry, &rz, group));
+		MP_CHECKOK(ec_GF2m_pt_dbl_proj(rx, ry, &rz, rx, ry, &rz, group));
+		MP_CHECKOK(ec_GF2m_pt_dbl_proj(rx, ry, &rz, rx, ry, &rz, group));
+		/* R = R + (ni * P) */
+		MP_CHECKOK(ec_GF2m_pt_add_proj
+				   (rx, ry, &rz, &precomp[ni][0], &precomp[ni][1], rx, ry,
+					&rz, group));
+	}
+
+	/* convert result S to affine coordinates */
+	MP_CHECKOK(ec_GF2m_pt_proj2aff(rx, ry, &rz, rx, ry, group));
+
+  CLEANUP:
+	mp_clear(&rz);
+	return res;
+}
+#endif