--- /dev/null
+/* crypto/ec/ecp_mont.c */
+/*
+ * Originally written by Bodo Moeller for the OpenSSL project.
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ * Portions of this software developed by SUN MICROSYSTEMS, INC.,
+ * and contributed to the OpenSSL project.
+ */
+
+#include <openssl/err.h>
+
+#ifdef OPENSSL_FIPS
+#include <openssl/fips.h>
+#endif
+
+#include "ec_lcl.h"
+
+
+const EC_METHOD *EC_GFp_mont_method(void)
+ {
+ static const EC_METHOD ret = {
+ EC_FLAGS_DEFAULT_OCT,
+ NID_X9_62_prime_field,
+ ec_GFp_mont_group_init,
+ ec_GFp_mont_group_finish,
+ ec_GFp_mont_group_clear_finish,
+ ec_GFp_mont_group_copy,
+ ec_GFp_mont_group_set_curve,
+ ec_GFp_simple_group_get_curve,
+ ec_GFp_simple_group_get_degree,
+ ec_GFp_simple_group_check_discriminant,
+ ec_GFp_simple_point_init,
+ ec_GFp_simple_point_finish,
+ ec_GFp_simple_point_clear_finish,
+ ec_GFp_simple_point_copy,
+ ec_GFp_simple_point_set_to_infinity,
+ ec_GFp_simple_set_Jprojective_coordinates_GFp,
+ ec_GFp_simple_get_Jprojective_coordinates_GFp,
+ ec_GFp_simple_point_set_affine_coordinates,
+ ec_GFp_simple_point_get_affine_coordinates,
+ 0,0,0,
+ ec_GFp_simple_add,
+ ec_GFp_simple_dbl,
+ ec_GFp_simple_invert,
+ ec_GFp_simple_is_at_infinity,
+ ec_GFp_simple_is_on_curve,
+ ec_GFp_simple_cmp,
+ ec_GFp_simple_make_affine,
+ ec_GFp_simple_points_make_affine,
+ 0 /* mul */,
+ 0 /* precompute_mult */,
+ 0 /* have_precompute_mult */,
+ ec_GFp_mont_field_mul,
+ ec_GFp_mont_field_sqr,
+ 0 /* field_div */,
+ ec_GFp_mont_field_encode,
+ ec_GFp_mont_field_decode,
+ ec_GFp_mont_field_set_to_one };
+
+#ifdef OPENSSL_FIPS
+ if (FIPS_mode())
+ return fips_ec_gfp_mont_method();
+#endif
+
+ return &ret;
+ }
+
+
+int ec_GFp_mont_group_init(EC_GROUP *group)
+ {
+ int ok;
+
+ ok = ec_GFp_simple_group_init(group);
+ group->field_data1 = NULL;
+ group->field_data2 = NULL;
+ return ok;
+ }
+
+
+void ec_GFp_mont_group_finish(EC_GROUP *group)
+ {
+ if (group->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ }
+ if (group->field_data2 != NULL)
+ {
+ BN_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+ ec_GFp_simple_group_finish(group);
+ }
+
+
+void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
+ {
+ if (group->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ }
+ if (group->field_data2 != NULL)
+ {
+ BN_clear_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+ ec_GFp_simple_group_clear_finish(group);
+ }
+
+
+int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
+ {
+ if (dest->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(dest->field_data1);
+ dest->field_data1 = NULL;
+ }
+ if (dest->field_data2 != NULL)
+ {
+ BN_clear_free(dest->field_data2);
+ dest->field_data2 = NULL;
+ }
+
+ if (!ec_GFp_simple_group_copy(dest, src)) return 0;
+
+ if (src->field_data1 != NULL)
+ {
+ dest->field_data1 = BN_MONT_CTX_new();
+ if (dest->field_data1 == NULL) return 0;
+ if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
+ }
+ if (src->field_data2 != NULL)
+ {
+ dest->field_data2 = BN_dup(src->field_data2);
+ if (dest->field_data2 == NULL) goto err;
+ }
+
+ return 1;
+
+ err:
+ if (dest->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(dest->field_data1);
+ dest->field_data1 = NULL;
+ }
+ return 0;
+ }
+
+
+int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+ {
+ BN_CTX *new_ctx = NULL;
+ BN_MONT_CTX *mont = NULL;
+ BIGNUM *one = NULL;
+ int ret = 0;
+
+ if (group->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ }
+ if (group->field_data2 != NULL)
+ {
+ BN_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+
+ if (ctx == NULL)
+ {
+ ctx = new_ctx = BN_CTX_new();
+ if (ctx == NULL)
+ return 0;
+ }
+
+ mont = BN_MONT_CTX_new();
+ if (mont == NULL) goto err;
+ if (!BN_MONT_CTX_set(mont, p, ctx))
+ {
+ ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
+ goto err;
+ }
+ one = BN_new();
+ if (one == NULL) goto err;
+ if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
+
+ group->field_data1 = mont;
+ mont = NULL;
+ group->field_data2 = one;
+ one = NULL;
+
+ ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
+
+ if (!ret)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ BN_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+
+ err:
+ if (new_ctx != NULL)
+ BN_CTX_free(new_ctx);
+ if (mont != NULL)
+ BN_MONT_CTX_free(mont);
+ return ret;
+ }
+
+
+int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_from_montgomery(r, a, group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
+ {
+ if (group->field_data2 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ if (!BN_copy(r, group->field_data2)) return 0;
+ return 1;
+ }
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