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-rw-r--r--security/nss/lib/freebl/ecl/ecl.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/ecl/ecl.c b/security/nss/lib/freebl/ecl/ecl.c
new file mode 100644
index 000000000..3540af781
--- /dev/null
+++ b/security/nss/lib/freebl/ecl/ecl.c
@@ -0,0 +1,301 @@
+/* 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 "mpi.h"
+#include "mplogic.h"
+#include "ecl.h"
+#include "ecl-priv.h"
+#include "ecp.h"
+#include <stdlib.h>
+#include <string.h>
+
+/* Allocate memory for a new ECGroup object. */
+ECGroup *
+ECGroup_new()
+{
+ mp_err res = MP_OKAY;
+ ECGroup *group;
+ group = (ECGroup *)malloc(sizeof(ECGroup));
+ if (group == NULL)
+ return NULL;
+ group->constructed = MP_YES;
+ group->meth = NULL;
+ group->text = NULL;
+ MP_DIGITS(&group->curvea) = 0;
+ MP_DIGITS(&group->curveb) = 0;
+ MP_DIGITS(&group->genx) = 0;
+ MP_DIGITS(&group->geny) = 0;
+ MP_DIGITS(&group->order) = 0;
+ group->base_point_mul = NULL;
+ group->points_mul = NULL;
+ group->validate_point = NULL;
+ group->extra1 = NULL;
+ group->extra2 = NULL;
+ group->extra_free = NULL;
+ MP_CHECKOK(mp_init(&group->curvea));
+ MP_CHECKOK(mp_init(&group->curveb));
+ MP_CHECKOK(mp_init(&group->genx));
+ MP_CHECKOK(mp_init(&group->geny));
+ MP_CHECKOK(mp_init(&group->order));
+
+CLEANUP:
+ if (res != MP_OKAY) {
+ ECGroup_free(group);
+ return NULL;
+ }
+ return group;
+}
+
+/* Construct a generic ECGroup for elliptic curves over prime fields. */
+ECGroup *
+ECGroup_consGFp(const mp_int *irr, const mp_int *curvea,
+ const mp_int *curveb, const mp_int *genx,
+ const mp_int *geny, const mp_int *order, int cofactor)
+{
+ mp_err res = MP_OKAY;
+ ECGroup *group = NULL;
+
+ group = ECGroup_new();
+ if (group == NULL)
+ return NULL;
+
+ group->meth = GFMethod_consGFp(irr);
+ if (group->meth == NULL) {
+ res = MP_MEM;
+ goto CLEANUP;
+ }
+ MP_CHECKOK(mp_copy(curvea, &group->curvea));
+ MP_CHECKOK(mp_copy(curveb, &group->curveb));
+ MP_CHECKOK(mp_copy(genx, &group->genx));
+ MP_CHECKOK(mp_copy(geny, &group->geny));
+ MP_CHECKOK(mp_copy(order, &group->order));
+ group->cofactor = cofactor;
+ group->point_add = &ec_GFp_pt_add_aff;
+ group->point_sub = &ec_GFp_pt_sub_aff;
+ group->point_dbl = &ec_GFp_pt_dbl_aff;
+ group->point_mul = &ec_GFp_pt_mul_jm_wNAF;
+ group->base_point_mul = NULL;
+ group->points_mul = &ec_GFp_pts_mul_jac;
+ group->validate_point = &ec_GFp_validate_point;
+
+CLEANUP:
+ if (res != MP_OKAY) {
+ ECGroup_free(group);
+ return NULL;
+ }
+ return group;
+}
+
+/* Construct a generic ECGroup for elliptic curves over prime fields with
+ * field arithmetic implemented in Montgomery coordinates. */
+ECGroup *
+ECGroup_consGFp_mont(const mp_int *irr, const mp_int *curvea,
+ const mp_int *curveb, const mp_int *genx,
+ const mp_int *geny, const mp_int *order, int cofactor)
+{
+ mp_err res = MP_OKAY;
+ ECGroup *group = NULL;
+
+ group = ECGroup_new();
+ if (group == NULL)
+ return NULL;
+
+ group->meth = GFMethod_consGFp_mont(irr);
+ if (group->meth == NULL) {
+ res = MP_MEM;
+ goto CLEANUP;
+ }
+ MP_CHECKOK(group->meth->field_enc(curvea, &group->curvea, group->meth));
+ MP_CHECKOK(group->meth->field_enc(curveb, &group->curveb, group->meth));
+ MP_CHECKOK(group->meth->field_enc(genx, &group->genx, group->meth));
+ MP_CHECKOK(group->meth->field_enc(geny, &group->geny, group->meth));
+ MP_CHECKOK(mp_copy(order, &group->order));
+ group->cofactor = cofactor;
+ group->point_add = &ec_GFp_pt_add_aff;
+ group->point_sub = &ec_GFp_pt_sub_aff;
+ group->point_dbl = &ec_GFp_pt_dbl_aff;
+ group->point_mul = &ec_GFp_pt_mul_jm_wNAF;
+ group->base_point_mul = NULL;
+ group->points_mul = &ec_GFp_pts_mul_jac;
+ group->validate_point = &ec_GFp_validate_point;
+
+CLEANUP:
+ if (res != MP_OKAY) {
+ ECGroup_free(group);
+ return NULL;
+ }
+ return group;
+}
+
+/* Construct ECGroup from hex parameters and name, if any. Called by
+ * ECGroup_fromHex and ECGroup_fromName. */
+ECGroup *
+ecgroup_fromNameAndHex(const ECCurveName name,
+ const ECCurveParams *params)
+{
+ mp_int irr, curvea, curveb, genx, geny, order;
+ int bits;
+ ECGroup *group = NULL;
+ mp_err res = MP_OKAY;
+
+ /* initialize values */
+ MP_DIGITS(&irr) = 0;
+ MP_DIGITS(&curvea) = 0;
+ MP_DIGITS(&curveb) = 0;
+ MP_DIGITS(&genx) = 0;
+ MP_DIGITS(&geny) = 0;
+ MP_DIGITS(&order) = 0;
+ MP_CHECKOK(mp_init(&irr));
+ MP_CHECKOK(mp_init(&curvea));
+ MP_CHECKOK(mp_init(&curveb));
+ MP_CHECKOK(mp_init(&genx));
+ MP_CHECKOK(mp_init(&geny));
+ MP_CHECKOK(mp_init(&order));
+ MP_CHECKOK(mp_read_radix(&irr, params->irr, 16));
+ MP_CHECKOK(mp_read_radix(&curvea, params->curvea, 16));
+ MP_CHECKOK(mp_read_radix(&curveb, params->curveb, 16));
+ MP_CHECKOK(mp_read_radix(&genx, params->genx, 16));
+ MP_CHECKOK(mp_read_radix(&geny, params->geny, 16));
+ MP_CHECKOK(mp_read_radix(&order, params->order, 16));
+
+ /* determine number of bits */
+ bits = mpl_significant_bits(&irr) - 1;
+ if (bits < MP_OKAY) {
+ res = bits;
+ goto CLEANUP;
+ }
+
+ /* determine which optimizations (if any) to use */
+ if (params->field == ECField_GFp) {
+ switch (name) {
+ case ECCurve_SECG_PRIME_256R1:
+ group =
+ ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,
+ &order, params->cofactor);
+ if (group == NULL) {
+ res = MP_UNDEF;
+ goto CLEANUP;
+ }
+ MP_CHECKOK(ec_group_set_gfp256(group, name));
+ MP_CHECKOK(ec_group_set_gfp256_32(group, name));
+ break;
+ case ECCurve_SECG_PRIME_521R1:
+ group =
+ ECGroup_consGFp(&irr, &curvea, &curveb, &genx, &geny,
+ &order, params->cofactor);
+ if (group == NULL) {
+ res = MP_UNDEF;
+ goto CLEANUP;
+ }
+ MP_CHECKOK(ec_group_set_gfp521(group, name));
+ break;
+ default:
+ /* use generic arithmetic */
+ group =
+ ECGroup_consGFp_mont(&irr, &curvea, &curveb, &genx, &geny,
+ &order, params->cofactor);
+ if (group == NULL) {
+ res = MP_UNDEF;
+ goto CLEANUP;
+ }
+ }
+ } else {
+ res = MP_UNDEF;
+ goto CLEANUP;
+ }
+
+ /* set name, if any */
+ if ((group != NULL) && (params->text != NULL)) {
+ group->text = strdup(params->text);
+ if (group->text == NULL) {
+ res = MP_MEM;
+ }
+ }
+
+CLEANUP:
+ mp_clear(&irr);
+ mp_clear(&curvea);
+ mp_clear(&curveb);
+ mp_clear(&genx);
+ mp_clear(&geny);
+ mp_clear(&order);
+ if (res != MP_OKAY) {
+ ECGroup_free(group);
+ return NULL;
+ }
+ return group;
+}
+
+/* Construct ECGroup from hexadecimal representations of parameters. */
+ECGroup *
+ECGroup_fromHex(const ECCurveParams *params)
+{
+ return ecgroup_fromNameAndHex(ECCurve_noName, params);
+}
+
+/* Construct ECGroup from named parameters. */
+ECGroup *
+ECGroup_fromName(const ECCurveName name)
+{
+ ECGroup *group = NULL;
+ ECCurveParams *params = NULL;
+ mp_err res = MP_OKAY;
+
+ params = EC_GetNamedCurveParams(name);
+ if (params == NULL) {
+ res = MP_UNDEF;
+ goto CLEANUP;
+ }
+
+ /* construct actual group */
+ group = ecgroup_fromNameAndHex(name, params);
+ if (group == NULL) {
+ res = MP_UNDEF;
+ goto CLEANUP;
+ }
+
+CLEANUP:
+ EC_FreeCurveParams(params);
+ if (res != MP_OKAY) {
+ ECGroup_free(group);
+ return NULL;
+ }
+ return group;
+}
+
+/* Validates an EC public key as described in Section 5.2.2 of X9.62. */
+mp_err
+ECPoint_validate(const ECGroup *group, const mp_int *px, const mp_int *py)
+{
+ /* 1: Verify that publicValue is not the point at infinity */
+ /* 2: Verify that the coordinates of publicValue are elements
+ * of the field.
+ */
+ /* 3: Verify that publicValue is on the curve. */
+ /* 4: Verify that the order of the curve times the publicValue
+ * is the point at infinity.
+ */
+ return group->validate_point(px, py, group);
+}
+
+/* Free the memory allocated (if any) to an ECGroup object. */
+void
+ECGroup_free(ECGroup *group)
+{
+ if (group == NULL)
+ return;
+ GFMethod_free(group->meth);
+ if (group->constructed == MP_NO)
+ return;
+ mp_clear(&group->curvea);
+ mp_clear(&group->curveb);
+ mp_clear(&group->genx);
+ mp_clear(&group->geny);
+ mp_clear(&group->order);
+ if (group->text != NULL)
+ free(group->text);
+ if (group->extra_free != NULL)
+ group->extra_free(group);
+ free(group);
+}
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