/* $OpenBSD: ec_oct.c,v 1.19 2024/10/30 17:52:34 tb Exp $ */ /* * Originally written by Bodo Moeller for the OpenSSL project. */ /* ==================================================================== * Copyright (c) 1998-2003 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. * Binary polynomial ECC support in OpenSSL originally developed by * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */ #include #include #include #include #include #include "asn1_local.h" #include "ec_local.h" int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point, const BIGNUM *x, int y_bit, BN_CTX *ctx_in) { BN_CTX *ctx; int ret = 0; if ((ctx = ctx_in) == NULL) ctx = BN_CTX_new(); if (ctx == NULL) goto err; if (group->meth->point_set_compressed_coordinates == NULL) { ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); goto err; } if (group->meth != point->meth) { ECerror(EC_R_INCOMPATIBLE_OBJECTS); goto err; } ret = group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx); err: if (ctx != ctx_in) BN_CTX_free(ctx); return ret; } LCRYPTO_ALIAS(EC_POINT_set_compressed_coordinates); int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, const BIGNUM *x, int y_bit, BN_CTX *ctx) { return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx); } LCRYPTO_ALIAS(EC_POINT_set_compressed_coordinates_GFp); int ec_point_to_octets(const EC_GROUP *group, const EC_POINT *point, int form, unsigned char **out_buf, size_t *out_len, BN_CTX *ctx) { unsigned char *buf = NULL; size_t len = 0; int ret = 0; if (out_buf != NULL && *out_buf != NULL) goto err; *out_len = 0; if ((len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx)) == 0) goto err; if (out_buf == NULL) goto done; if ((buf = calloc(1, len)) == NULL) goto err; if (EC_POINT_point2oct(group, point, form, buf, len, ctx) != len) goto err; *out_buf = buf; buf = NULL; done: *out_len = len; ret = 1; err: freezero(buf, len); return ret; } int ec_point_from_octets(const EC_GROUP *group, const unsigned char *buf, size_t buf_len, EC_POINT **out_point, uint8_t *out_form, BN_CTX *ctx) { EC_POINT *point; int ret = 0; if ((point = *out_point) == NULL) point = EC_POINT_new(group); if (point == NULL) goto err; if (!EC_POINT_oct2point(group, point, buf, buf_len, ctx)) goto err; if (out_form != NULL) *out_form = buf[0] & ~1U; /* XXX - EC_OCT_YBIT */ *out_point = point; point = NULL; ret = 1; err: if (*out_point != point) EC_POINT_free(point); return ret; } size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form, unsigned char *buf, size_t len, BN_CTX *ctx_in) { BN_CTX *ctx; size_t ret = 0; if ((ctx = ctx_in) == NULL) ctx = BN_CTX_new(); if (ctx == NULL) goto err; if (group->meth->point2oct == NULL) { ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); goto err; } if (group->meth != point->meth) { ECerror(EC_R_INCOMPATIBLE_OBJECTS); goto err; } ret = group->meth->point2oct(group, point, form, buf, len, ctx); err: if (ctx != ctx_in) BN_CTX_free(ctx); return ret; } LCRYPTO_ALIAS(EC_POINT_point2oct); int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, const unsigned char *buf, size_t len, BN_CTX *ctx_in) { BN_CTX *ctx; int ret = 0; if ((ctx = ctx_in) == NULL) ctx = BN_CTX_new(); if (ctx == NULL) goto err; if (group->meth->oct2point == NULL) { ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); goto err; } if (group->meth != point->meth) { ECerror(EC_R_INCOMPATIBLE_OBJECTS); goto err; } ret = group->meth->oct2point(group, point, buf, len, ctx); err: if (ctx != ctx_in) BN_CTX_free(ctx); return ret; } LCRYPTO_ALIAS(EC_POINT_oct2point);