/* $OpenBSD: ec_key.c,v 1.22 2018/11/09 23:39:45 tb Exp $ */ /* * Written by Nils Larsch for the OpenSSL project. */ /* ==================================================================== * Copyright (c) 1998-2005 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 originally developed by SUN MICROSYSTEMS, INC., and * contributed to the OpenSSL project. */ #include #include #include "bn_lcl.h" #include "ec_lcl.h" #include EC_KEY * EC_KEY_new(void) { EC_KEY *ret; ret = malloc(sizeof(EC_KEY)); if (ret == NULL) { ECerror(ERR_R_MALLOC_FAILURE); return (NULL); } ret->version = 1; ret->flags = 0; ret->group = NULL; ret->pub_key = NULL; ret->priv_key = NULL; ret->enc_flag = 0; ret->conv_form = POINT_CONVERSION_UNCOMPRESSED; ret->references = 1; ret->method_data = NULL; return (ret); } EC_KEY * EC_KEY_new_by_curve_name(int nid) { EC_KEY *ret = EC_KEY_new(); if (ret == NULL) return NULL; ret->group = EC_GROUP_new_by_curve_name(nid); if (ret->group == NULL) { EC_KEY_free(ret); return NULL; } return ret; } void EC_KEY_free(EC_KEY * r) { int i; if (r == NULL) return; i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC); if (i > 0) return; EC_GROUP_free(r->group); EC_POINT_free(r->pub_key); BN_clear_free(r->priv_key); EC_EX_DATA_free_all_data(&r->method_data); freezero(r, sizeof(EC_KEY)); } EC_KEY * EC_KEY_copy(EC_KEY * dest, const EC_KEY * src) { EC_EXTRA_DATA *d; if (dest == NULL || src == NULL) { ECerror(ERR_R_PASSED_NULL_PARAMETER); return NULL; } /* copy the parameters */ if (src->group) { const EC_METHOD *meth = EC_GROUP_method_of(src->group); /* clear the old group */ EC_GROUP_free(dest->group); dest->group = EC_GROUP_new(meth); if (dest->group == NULL) return NULL; if (!EC_GROUP_copy(dest->group, src->group)) return NULL; } /* copy the public key */ if (src->pub_key && src->group) { EC_POINT_free(dest->pub_key); dest->pub_key = EC_POINT_new(src->group); if (dest->pub_key == NULL) return NULL; if (!EC_POINT_copy(dest->pub_key, src->pub_key)) return NULL; } /* copy the private key */ if (src->priv_key) { if (dest->priv_key == NULL) { dest->priv_key = BN_new(); if (dest->priv_key == NULL) return NULL; } if (!BN_copy(dest->priv_key, src->priv_key)) return NULL; } /* copy method/extra data */ EC_EX_DATA_free_all_data(&dest->method_data); for (d = src->method_data; d != NULL; d = d->next) { void *t = d->dup_func(d->data); if (t == NULL) return 0; if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func, d->free_func, d->clear_free_func)) return 0; } /* copy the rest */ dest->enc_flag = src->enc_flag; dest->conv_form = src->conv_form; dest->version = src->version; dest->flags = src->flags; return dest; } EC_KEY * EC_KEY_dup(const EC_KEY * ec_key) { EC_KEY *ret = EC_KEY_new(); if (ret == NULL) return NULL; if (EC_KEY_copy(ret, ec_key) == NULL) { EC_KEY_free(ret); return NULL; } return ret; } int EC_KEY_up_ref(EC_KEY * r) { int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC); return ((i > 1) ? 1 : 0); } int EC_KEY_generate_key(EC_KEY *eckey) { int ok = 0; BN_CTX *ctx = NULL; BIGNUM *priv_key = NULL, *order = NULL; EC_POINT *pub_key = NULL; if (!eckey || !eckey->group) { ECerror(ERR_R_PASSED_NULL_PARAMETER); return 0; } if ((order = BN_new()) == NULL) goto err; if ((ctx = BN_CTX_new()) == NULL) goto err; if ((priv_key = eckey->priv_key) == NULL) { if ((priv_key = BN_new()) == NULL) goto err; } if (!EC_GROUP_get_order(eckey->group, order, ctx)) goto err; if (!bn_rand_interval(priv_key, BN_value_one(), order)) goto err; if ((pub_key = eckey->pub_key) == NULL) { if ((pub_key = EC_POINT_new(eckey->group)) == NULL) goto err; } if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) goto err; eckey->priv_key = priv_key; eckey->pub_key = pub_key; ok = 1; err: BN_free(order); if (eckey->pub_key == NULL) EC_POINT_free(pub_key); if (eckey->priv_key == NULL) BN_free(priv_key); BN_CTX_free(ctx); return (ok); } int EC_KEY_check_key(const EC_KEY * eckey) { int ok = 0; BN_CTX *ctx = NULL; const BIGNUM *order = NULL; EC_POINT *point = NULL; if (!eckey || !eckey->group || !eckey->pub_key) { ECerror(ERR_R_PASSED_NULL_PARAMETER); return 0; } if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key) > 0) { ECerror(EC_R_POINT_AT_INFINITY); goto err; } if ((ctx = BN_CTX_new()) == NULL) goto err; if ((point = EC_POINT_new(eckey->group)) == NULL) goto err; /* testing whether the pub_key is on the elliptic curve */ if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) { ECerror(EC_R_POINT_IS_NOT_ON_CURVE); goto err; } /* testing whether pub_key * order is the point at infinity */ order = &eckey->group->order; if (BN_is_zero(order)) { ECerror(EC_R_INVALID_GROUP_ORDER); goto err; } if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) { ECerror(ERR_R_EC_LIB); goto err; } if (EC_POINT_is_at_infinity(eckey->group, point) <= 0) { ECerror(EC_R_WRONG_ORDER); goto err; } /* * in case the priv_key is present : check if generator * priv_key == * pub_key */ if (eckey->priv_key) { if (BN_cmp(eckey->priv_key, order) >= 0) { ECerror(EC_R_WRONG_ORDER); goto err; } if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, NULL, NULL, ctx)) { ECerror(ERR_R_EC_LIB); goto err; } if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) { ECerror(EC_R_INVALID_PRIVATE_KEY); goto err; } } ok = 1; err: BN_CTX_free(ctx); EC_POINT_free(point); return (ok); } int EC_KEY_set_public_key_affine_coordinates(EC_KEY * key, BIGNUM * x, BIGNUM * y) { BN_CTX *ctx = NULL; BIGNUM *tx, *ty; EC_POINT *point = NULL; int ok = 0, tmp_nid, is_char_two = 0; if (!key || !key->group || !x || !y) { ECerror(ERR_R_PASSED_NULL_PARAMETER); return 0; } ctx = BN_CTX_new(); if (!ctx) goto err; point = EC_POINT_new(key->group); if (!point) goto err; tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group)); if (tmp_nid == NID_X9_62_characteristic_two_field) is_char_two = 1; if ((tx = BN_CTX_get(ctx)) == NULL) goto err; if ((ty = BN_CTX_get(ctx)) == NULL) goto err; #ifndef OPENSSL_NO_EC2M if (is_char_two) { if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point, x, y, ctx)) goto err; if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point, tx, ty, ctx)) goto err; } else #endif { if (!EC_POINT_set_affine_coordinates_GFp(key->group, point, x, y, ctx)) goto err; if (!EC_POINT_get_affine_coordinates_GFp(key->group, point, tx, ty, ctx)) goto err; } /* * Check if retrieved coordinates match originals: if not values are * out of range. */ if (BN_cmp(x, tx) || BN_cmp(y, ty)) { ECerror(EC_R_COORDINATES_OUT_OF_RANGE); goto err; } if (!EC_KEY_set_public_key(key, point)) goto err; if (EC_KEY_check_key(key) == 0) goto err; ok = 1; err: BN_CTX_free(ctx); EC_POINT_free(point); return ok; } const EC_GROUP * EC_KEY_get0_group(const EC_KEY * key) { return key->group; } int EC_KEY_set_group(EC_KEY * key, const EC_GROUP * group) { EC_GROUP_free(key->group); key->group = EC_GROUP_dup(group); return (key->group == NULL) ? 0 : 1; } const BIGNUM * EC_KEY_get0_private_key(const EC_KEY * key) { return key->priv_key; } int EC_KEY_set_private_key(EC_KEY * key, const BIGNUM * priv_key) { BN_clear_free(key->priv_key); key->priv_key = BN_dup(priv_key); return (key->priv_key == NULL) ? 0 : 1; } const EC_POINT * EC_KEY_get0_public_key(const EC_KEY * key) { return key->pub_key; } int EC_KEY_set_public_key(EC_KEY * key, const EC_POINT * pub_key) { EC_POINT_free(key->pub_key); key->pub_key = EC_POINT_dup(pub_key, key->group); return (key->pub_key == NULL) ? 0 : 1; } unsigned int EC_KEY_get_enc_flags(const EC_KEY * key) { return key->enc_flag; } void EC_KEY_set_enc_flags(EC_KEY * key, unsigned int flags) { key->enc_flag = flags; } point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY * key) { return key->conv_form; } void EC_KEY_set_conv_form(EC_KEY * key, point_conversion_form_t cform) { key->conv_form = cform; if (key->group != NULL) EC_GROUP_set_point_conversion_form(key->group, cform); } void * EC_KEY_get_key_method_data(EC_KEY *key, void *(*dup_func) (void *), void (*free_func) (void *), void (*clear_free_func) (void *)) { void *ret; CRYPTO_r_lock(CRYPTO_LOCK_EC); ret = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func); CRYPTO_r_unlock(CRYPTO_LOCK_EC); return ret; } void * EC_KEY_insert_key_method_data(EC_KEY * key, void *data, void *(*dup_func) (void *), void (*free_func) (void *), void (*clear_free_func) (void *)) { EC_EXTRA_DATA *ex_data; CRYPTO_w_lock(CRYPTO_LOCK_EC); ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func); if (ex_data == NULL) EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func); CRYPTO_w_unlock(CRYPTO_LOCK_EC); return ex_data; } void EC_KEY_set_asn1_flag(EC_KEY * key, int flag) { if (key->group != NULL) EC_GROUP_set_asn1_flag(key->group, flag); } int EC_KEY_precompute_mult(EC_KEY * key, BN_CTX * ctx) { if (key->group == NULL) return 0; return EC_GROUP_precompute_mult(key->group, ctx); } int EC_KEY_get_flags(const EC_KEY * key) { return key->flags; } void EC_KEY_set_flags(EC_KEY * key, int flags) { key->flags |= flags; } void EC_KEY_clear_flags(EC_KEY * key, int flags) { key->flags &= ~flags; }