Update NSS to NSS_3_15_BETA2.

nss/lib/freebl/ecl/ecp_384.c

+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ecp.h"
+#include "mpi.h"
+#include "mplogic.h"
+#include "mpi-priv.h"
+
+/* Fast modular reduction for p384 = 2^384 - 2^128 - 2^96 + 2^32 - 1.  a can be r. 
+ * Uses algorithm 2.30 from Hankerson, Menezes, Vanstone. Guide to 
+ * Elliptic Curve Cryptography. */
+static mp_err
+ec_GFp_nistp384_mod(const mp_int *a, mp_int *r, const GFMethod *meth)
+{
+        mp_err res = MP_OKAY;
+        int a_bits = mpl_significant_bits(a);
+        int i;
+
+        /* m1, m2 are statically-allocated mp_int of exactly the size we need */
+        mp_int m[10];
+
+#ifdef ECL_THIRTY_TWO_BIT
+        mp_digit s[10][12];
+        for (i = 0; i < 10; i++) {
+                MP_SIGN(&m[i]) = MP_ZPOS;
+                MP_ALLOC(&m[i]) = 12;
+                MP_USED(&m[i]) = 12;
+                MP_DIGITS(&m[i]) = s[i];
+        }
+#else
+        mp_digit s[10][6];
+        for (i = 0; i < 10; i++) {
+                MP_SIGN(&m[i]) = MP_ZPOS;
+                MP_ALLOC(&m[i]) = 6;
+                MP_USED(&m[i]) = 6;
+                MP_DIGITS(&m[i]) = s[i];
+        }
+#endif
+
+#ifdef ECL_THIRTY_TWO_BIT
+        /* for polynomials larger than twice the field size or polynomials 
+         * not using all words, use regular reduction */
+        if ((a_bits > 768) || (a_bits <= 736)) {
+                MP_CHECKOK(mp_mod(a, &meth->irr, r));
+        } else {
+                for (i = 0; i < 12; i++) {
+                        s[0][i] = MP_DIGIT(a, i);
+                }
+                s[1][0] = 0;
+                s[1][1] = 0;
+                s[1][2] = 0;
+                s[1][3] = 0;
+                s[1][4] = MP_DIGIT(a, 21);
+                s[1][5] = MP_DIGIT(a, 22);
+                s[1][6] = MP_DIGIT(a, 23);
+                s[1][7] = 0;
+                s[1][8] = 0;
+                s[1][9] = 0;
+                s[1][10] = 0;
+                s[1][11] = 0;
+                for (i = 0; i < 12; i++) {
+                        s[2][i] = MP_DIGIT(a, i+12);
+                }
+                s[3][0] = MP_DIGIT(a, 21);
+                s[3][1] = MP_DIGIT(a, 22);
+                s[3][2] = MP_DIGIT(a, 23);
+                for (i = 3; i < 12; i++) {
+                        s[3][i] = MP_DIGIT(a, i+9);
+                }
+                s[4][0] = 0;
+                s[4][1] = MP_DIGIT(a, 23);
+                s[4][2] = 0;
+                s[4][3] = MP_DIGIT(a, 20);
+                for (i = 4; i < 12; i++) {
+                        s[4][i] = MP_DIGIT(a, i+8);
+                }
+                s[5][0] = 0;
+                s[5][1] = 0;
+                s[5][2] = 0;
+                s[5][3] = 0;
+                s[5][4] = MP_DIGIT(a, 20);
+                s[5][5] = MP_DIGIT(a, 21);
+                s[5][6] = MP_DIGIT(a, 22);
+                s[5][7] = MP_DIGIT(a, 23);
+                s[5][8] = 0;
+                s[5][9] = 0;
+                s[5][10] = 0;
+                s[5][11] = 0;
+                s[6][0] = MP_DIGIT(a, 20);
+                s[6][1] = 0;
+                s[6][2] = 0;
+                s[6][3] = MP_DIGIT(a, 21);
+                s[6][4] = MP_DIGIT(a, 22);
+                s[6][5] = MP_DIGIT(a, 23);
+                s[6][6] = 0;
+                s[6][7] = 0;
+                s[6][8] = 0;
+                s[6][9] = 0;
+                s[6][10] = 0;
+                s[6][11] = 0;
+                s[7][0] = MP_DIGIT(a, 23);
+                for (i = 1; i < 12; i++) {
+                        s[7][i] = MP_DIGIT(a, i+11);
+                }
+                s[8][0] = 0;
+                s[8][1] = MP_DIGIT(a, 20);
+                s[8][2] = MP_DIGIT(a, 21);
+                s[8][3] = MP_DIGIT(a, 22);
+                s[8][4] = MP_DIGIT(a, 23);
+                s[8][5] = 0;
+                s[8][6] = 0;
+                s[8][7] = 0;
+                s[8][8] = 0;
+                s[8][9] = 0;
+                s[8][10] = 0;
+                s[8][11] = 0;
+                s[9][0] = 0;
+                s[9][1] = 0;
+                s[9][2] = 0;
+                s[9][3] = MP_DIGIT(a, 23);
+                s[9][4] = MP_DIGIT(a, 23);
+                s[9][5] = 0;
+                s[9][6] = 0;
+                s[9][7] = 0;
+                s[9][8] = 0;
+                s[9][9] = 0;
+                s[9][10] = 0;
+                s[9][11] = 0;
+
+                MP_CHECKOK(mp_add(&m[0], &m[1], r));
+                MP_CHECKOK(mp_add(r, &m[1], r));
+                MP_CHECKOK(mp_add(r, &m[2], r));
+                MP_CHECKOK(mp_add(r, &m[3], r));
+                MP_CHECKOK(mp_add(r, &m[4], r));
+                MP_CHECKOK(mp_add(r, &m[5], r));
+                MP_CHECKOK(mp_add(r, &m[6], r));
+                MP_CHECKOK(mp_sub(r, &m[7], r));
+                MP_CHECKOK(mp_sub(r, &m[8], r));
+                MP_CHECKOK(mp_submod(r, &m[9], &meth->irr, r));
+                s_mp_clamp(r);
+        }
+#else
+        /* for polynomials larger than twice the field size or polynomials 
+         * not using all words, use regular reduction */
+        if ((a_bits > 768) || (a_bits <= 736)) {
+                MP_CHECKOK(mp_mod(a, &meth->irr, r));
+        } else {
+                for (i = 0; i < 6; i++) {
+                        s[0][i] = MP_DIGIT(a, i);
+                }
+                s[1][0] = 0;
+                s[1][1] = 0;
+                s[1][2] = (MP_DIGIT(a, 10) >> 32) | (MP_DIGIT(a, 11) << 32);
+                s[1][3] = MP_DIGIT(a, 11) >> 32;
+                s[1][4] = 0;
+                s[1][5] = 0;
+                for (i = 0; i < 6; i++) {
+                        s[2][i] = MP_DIGIT(a, i+6);
+                }
+                s[3][0] = (MP_DIGIT(a, 10) >> 32) | (MP_DIGIT(a, 11) << 32);
+                s[3][1] = (MP_DIGIT(a, 11) >> 32) | (MP_DIGIT(a, 6) << 32);
+                for (i = 2; i < 6; i++) {
+                        s[3][i] = (MP_DIGIT(a, i+4) >> 32) | (MP_DIGIT(a, i+5) << 32);
+                }
+                s[4][0] = (MP_DIGIT(a, 11) >> 32) << 32;
+                s[4][1] = MP_DIGIT(a, 10) << 32;
+                for (i = 2; i < 6; i++) {
+                        s[4][i] = MP_DIGIT(a, i+4);
+                }
+                s[5][0] = 0;
+                s[5][1] = 0;
+                s[5][2] = MP_DIGIT(a, 10);
+                s[5][3] = MP_DIGIT(a, 11);
+                s[5][4] = 0;
+                s[5][5] = 0;
+                s[6][0] = (MP_DIGIT(a, 10) << 32) >> 32;
+                s[6][1] = (MP_DIGIT(a, 10) >> 32) << 32;
+                s[6][2] = MP_DIGIT(a, 11);
+                s[6][3] = 0;
+                s[6][4] = 0;
+                s[6][5] = 0;
+                s[7][0] = (MP_DIGIT(a, 11) >> 32) | (MP_DIGIT(a, 6) << 32);
+                for (i = 1; i < 6; i++) {
+                        s[7][i] = (MP_DIGIT(a, i+5) >> 32) | (MP_DIGIT(a, i+6) << 32);
+                }
+                s[8][0] = MP_DIGIT(a, 10) << 32;
+                s[8][1] = (MP_DIGIT(a, 10) >> 32) | (MP_DIGIT(a, 11) << 32);
+                s[8][2] = MP_DIGIT(a, 11) >> 32;
+                s[8][3] = 0;
+                s[8][4] = 0;
+                s[8][5] = 0;
+                s[9][0] = 0;
+                s[9][1] = (MP_DIGIT(a, 11) >> 32) << 32;
+                s[9][2] = MP_DIGIT(a, 11) >> 32;
+                s[9][3] = 0;
+                s[9][4] = 0;
+                s[9][5] = 0;
+
+                MP_CHECKOK(mp_add(&m[0], &m[1], r));
+                MP_CHECKOK(mp_add(r, &m[1], r));
+                MP_CHECKOK(mp_add(r, &m[2], r));
+                MP_CHECKOK(mp_add(r, &m[3], r));
+                MP_CHECKOK(mp_add(r, &m[4], r));
+                MP_CHECKOK(mp_add(r, &m[5], r));
+                MP_CHECKOK(mp_add(r, &m[6], r));
+                MP_CHECKOK(mp_sub(r, &m[7], r));
+                MP_CHECKOK(mp_sub(r, &m[8], r));
+                MP_CHECKOK(mp_submod(r, &m[9], &meth->irr, r));
+                s_mp_clamp(r);
+        }
+#endif
+
+  CLEANUP:
+        return res;
+}
+
+/* Compute the square of polynomial a, reduce modulo p384. Store the
+ * result in r.  r could be a.  Uses optimized modular reduction for p384. 
+ */
+static mp_err
+ec_GFp_nistp384_sqr(const mp_int *a, mp_int *r, const GFMethod *meth)
+{
+        mp_err res = MP_OKAY;
+
+        MP_CHECKOK(mp_sqr(a, r));
+        MP_CHECKOK(ec_GFp_nistp384_mod(r, r, meth));
+  CLEANUP:
+        return res;
+}
+
+/* Compute the product of two polynomials a and b, reduce modulo p384.
+ * Store the result in r.  r could be a or b; a could be b.  Uses
+ * optimized modular reduction for p384. */
+static mp_err
+ec_GFp_nistp384_mul(const mp_int *a, const mp_int *b, mp_int *r,
+                                        const GFMethod *meth)
+{
+        mp_err res = MP_OKAY;
+
+        MP_CHECKOK(mp_mul(a, b, r));
+        MP_CHECKOK(ec_GFp_nistp384_mod(r, r, meth));
+  CLEANUP:
+        return res;
+}
+
+/* Wire in fast field arithmetic and precomputation of base point for
+ * named curves. */
+mp_err
+ec_group_set_gfp384(ECGroup *group, ECCurveName name)
+{
+        if (name == ECCurve_NIST_P384) {
+                group->meth->field_mod = &ec_GFp_nistp384_mod;
+                group->meth->field_mul = &ec_GFp_nistp384_mul;
+                group->meth->field_sqr = &ec_GFp_nistp384_sqr;
+        }
+        return MP_OKAY;
+}