/* Originally written by Bodo Moeller 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 of the attached software ("Contribution") are developed by * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. * * The Contribution is licensed pursuant to the OpenSSL open source * license provided above. * * The elliptic curve binary polynomial software is originally written by * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems * Laboratories. */ #include #include #include #include #include #include #include #include #include #include "internal.h" #include "../delocate.h" #include "../../internal.h" DEFINE_STATIC_EX_DATA_CLASS(g_ec_ex_data_class); EC_KEY *EC_KEY_new(void) { return EC_KEY_new_method(NULL); } EC_KEY *EC_KEY_new_method(const ENGINE *engine) { EC_KEY *ret = OPENSSL_malloc(sizeof(EC_KEY)); if (ret == NULL) { OPENSSL_PUT_ERROR(EC, ERR_R_MALLOC_FAILURE); return NULL; } OPENSSL_memset(ret, 0, sizeof(EC_KEY)); if (engine) { ret->ecdsa_meth = ENGINE_get_ECDSA_method(engine); } if (ret->ecdsa_meth) { METHOD_ref(ret->ecdsa_meth); } ret->conv_form = POINT_CONVERSION_UNCOMPRESSED; ret->references = 1; CRYPTO_new_ex_data(&ret->ex_data); if (ret->ecdsa_meth && ret->ecdsa_meth->init && !ret->ecdsa_meth->init(ret)) { CRYPTO_free_ex_data(g_ec_ex_data_class_bss_get(), ret, &ret->ex_data); if (ret->ecdsa_meth) { METHOD_unref(ret->ecdsa_meth); } OPENSSL_free(ret); return NULL; } return ret; } EC_KEY *EC_KEY_new_by_curve_name(int nid) { EC_KEY *ret = EC_KEY_new(); if (ret == NULL) { OPENSSL_PUT_ERROR(EC, ERR_R_MALLOC_FAILURE); 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) { if (r == NULL) { return; } if (!CRYPTO_refcount_dec_and_test_zero(&r->references)) { return; } if (r->ecdsa_meth) { if (r->ecdsa_meth->finish) { r->ecdsa_meth->finish(r); } METHOD_unref(r->ecdsa_meth); } EC_GROUP_free(r->group); EC_POINT_free(r->pub_key); BN_clear_free(r->priv_key); CRYPTO_free_ex_data(g_ec_ex_data_class_bss_get(), r, &r->ex_data); OPENSSL_cleanse((void *)r, sizeof(EC_KEY)); OPENSSL_free(r); } EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src) { if (dest == NULL || src == NULL) { OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER); return NULL; } /* Copy the parameters. */ if (src->group) { /* TODO(fork): duplicating the group seems wasteful. */ EC_GROUP_free(dest->group); dest->group = EC_GROUP_dup(src->group); if (dest->group == NULL) { return NULL; } } /* Copy the public key. */ if (src->pub_key && src->group) { EC_POINT_free(dest->pub_key); dest->pub_key = EC_POINT_dup(src->pub_key, src->group); if (dest->pub_key == NULL) { 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 */ if (src->ecdsa_meth) { METHOD_unref(dest->ecdsa_meth); dest->ecdsa_meth = src->ecdsa_meth; METHOD_ref(dest->ecdsa_meth); } CRYPTO_free_ex_data(g_ec_ex_data_class_bss_get(), dest, &dest->ex_data); if (!CRYPTO_dup_ex_data(g_ec_ex_data_class_bss_get(), &dest->ex_data, &src->ex_data)) { return NULL; } /* copy the rest */ dest->enc_flag = src->enc_flag; dest->conv_form = src->conv_form; 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) { CRYPTO_refcount_inc(&r->references); return 1; } int EC_KEY_is_opaque(const EC_KEY *key) { return key->ecdsa_meth && (key->ecdsa_meth->flags & ECDSA_FLAG_OPAQUE); } 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); /* TODO(fork): duplicating the group seems wasteful but see * |EC_KEY_set_conv_form|. */ key->group = EC_GROUP_dup(group); if (key->group == NULL) { return 0; } /* XXX: |BN_cmp| is not constant time. */ if (key->priv_key != NULL && BN_cmp(key->priv_key, EC_GROUP_get0_order(group)) >= 0) { return 0; } return 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) { /* XXX: |BN_cmp| is not constant time. */ if (key->group != NULL && BN_cmp(priv_key, EC_GROUP_get0_order(key->group)) >= 0) { OPENSSL_PUT_ERROR(EC, EC_R_WRONG_ORDER); return 0; } 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; } int EC_KEY_check_key(const EC_KEY *eckey) { int ok = 0; BN_CTX *ctx = NULL; EC_POINT *point = NULL; if (!eckey || !eckey->group || !eckey->pub_key) { OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER); return 0; } if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) { OPENSSL_PUT_ERROR(EC, EC_R_POINT_AT_INFINITY); goto err; } ctx = BN_CTX_new(); if (ctx == 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)) { OPENSSL_PUT_ERROR(EC, EC_R_POINT_IS_NOT_ON_CURVE); goto err; } /* in case the priv_key is present : * check if generator * priv_key == pub_key */ if (eckey->priv_key) { /* XXX: |BN_cmp| is not constant time. */ if (BN_cmp(eckey->priv_key, EC_GROUP_get0_order(eckey->group)) >= 0) { OPENSSL_PUT_ERROR(EC, EC_R_WRONG_ORDER); goto err; } point = EC_POINT_new(eckey->group); if (point == NULL || !EC_POINT_mul(eckey->group, point, eckey->priv_key, NULL, NULL, ctx)) { OPENSSL_PUT_ERROR(EC, ERR_R_EC_LIB); goto err; } if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) { OPENSSL_PUT_ERROR(EC, EC_R_INVALID_PRIVATE_KEY); goto err; } } ok = 1; err: BN_CTX_free(ctx); EC_POINT_free(point); return ok; } int EC_KEY_check_fips(const EC_KEY *key) { if (EC_KEY_is_opaque(key)) { /* Opaque keys can't be checked. */ OPENSSL_PUT_ERROR(EC, EC_R_PUBLIC_KEY_VALIDATION_FAILED); return 0; } if (!EC_KEY_check_key(key)) { return 0; } if (key->priv_key) { uint8_t data[16] = {0}; ECDSA_SIG *sig = ECDSA_do_sign(data, sizeof(data), key); #if defined(BORINGSSL_FIPS_BREAK_ECDSA_PWCT) data[0] = ~data[0]; #endif int ok = sig != NULL && ECDSA_do_verify(data, sizeof(data), sig, key); ECDSA_SIG_free(sig); if (!ok) { OPENSSL_PUT_ERROR(EC, EC_R_PUBLIC_KEY_VALIDATION_FAILED); return 0; } } return 1; } 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; if (!key || !key->group || !x || !y) { OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER); return 0; } ctx = BN_CTX_new(); if (ctx == NULL) { return 0; } BN_CTX_start(ctx); point = EC_POINT_new(key->group); if (point == NULL) { goto err; } tx = BN_CTX_get(ctx); ty = BN_CTX_get(ctx); if (tx == NULL || ty == NULL) { goto err; } if (!EC_POINT_set_affine_coordinates_GFp(key->group, point, x, y, ctx) || !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)) { OPENSSL_PUT_ERROR(EC, 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_end(ctx); BN_CTX_free(ctx); EC_POINT_free(point); return ok; } int EC_KEY_generate_key(EC_KEY *eckey) { int ok = 0; BIGNUM *priv_key = NULL; EC_POINT *pub_key = NULL; if (!eckey || !eckey->group) { OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER); return 0; } if (eckey->priv_key == NULL) { priv_key = BN_new(); if (priv_key == NULL) { goto err; } } else { priv_key = eckey->priv_key; } const BIGNUM *order = EC_GROUP_get0_order(eckey->group); /* Check that the size of the group order is FIPS compliant (FIPS 186-4 * B.4.2). */ if (BN_num_bits(order) < 160) { OPENSSL_PUT_ERROR(EC, EC_R_INVALID_GROUP_ORDER); goto err; } /* Generate the private key by testing candidates (FIPS 186-4 B.4.2). */ if (!BN_rand_range_ex(priv_key, 1, order)) { goto err; } if (eckey->pub_key == NULL) { pub_key = EC_POINT_new(eckey->group); if (pub_key == NULL) { goto err; } } else { pub_key = eckey->pub_key; } if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, NULL)) { goto err; } eckey->priv_key = priv_key; eckey->pub_key = pub_key; ok = 1; err: if (eckey->pub_key == NULL) { EC_POINT_free(pub_key); } if (eckey->priv_key == NULL) { BN_free(priv_key); } return ok; } int EC_KEY_generate_key_fips(EC_KEY *eckey) { return EC_KEY_generate_key(eckey) && EC_KEY_check_fips(eckey); } int EC_KEY_get_ex_new_index(long argl, void *argp, CRYPTO_EX_unused *unused, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) { int index; if (!CRYPTO_get_ex_new_index(g_ec_ex_data_class_bss_get(), &index, argl, argp, dup_func, free_func)) { return -1; } return index; } int EC_KEY_set_ex_data(EC_KEY *d, int idx, void *arg) { return CRYPTO_set_ex_data(&d->ex_data, idx, arg); } void *EC_KEY_get_ex_data(const EC_KEY *d, int idx) { return CRYPTO_get_ex_data(&d->ex_data, idx); } void EC_KEY_set_asn1_flag(EC_KEY *key, int flag) {}