diff options
Diffstat (limited to 'third_party/boringssl/src/crypto/ec/ec_key.c')
| -rw-r--r-- | third_party/boringssl/src/crypto/ec/ec_key.c | 503 |
1 files changed, 503 insertions, 0 deletions
diff --git a/third_party/boringssl/src/crypto/ec/ec_key.c b/third_party/boringssl/src/crypto/ec/ec_key.c new file mode 100644 index 0000000000..0defa98ab9 --- /dev/null +++ b/third_party/boringssl/src/crypto/ec/ec_key.c @@ -0,0 +1,503 @@ +/* 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 <openssl/ec_key.h> + +#include <string.h> + +#include <openssl/ec.h> +#include <openssl/engine.h> +#include <openssl/err.h> +#include <openssl/ex_data.h> +#include <openssl/mem.h> +#include <openssl/thread.h> + +#include "internal.h" +#include "../internal.h" + + +static CRYPTO_EX_DATA_CLASS g_ex_data_class = CRYPTO_EX_DATA_CLASS_INIT; + +EC_KEY *EC_KEY_new(void) { return EC_KEY_new_method(NULL); } + +EC_KEY *EC_KEY_new_method(const ENGINE *engine) { + EC_KEY *ret = (EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY)); + if (ret == NULL) { + OPENSSL_PUT_ERROR(EC, ERR_R_MALLOC_FAILURE); + return NULL; + } + + 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->version = 1; + ret->conv_form = POINT_CONVERSION_UNCOMPRESSED; + ret->references = 1; + + if (!CRYPTO_new_ex_data(&g_ex_data_class, ret, &ret->ex_data)) { + goto err1; + } + + if (ret->ecdsa_meth && ret->ecdsa_meth->init && !ret->ecdsa_meth->init(ret)) { + goto err2; + } + + return ret; + +err2: + CRYPTO_free_ex_data(&g_ex_data_class, ret, &ret->ex_data); +err1: + if (ret->ecdsa_meth) { + METHOD_unref(ret->ecdsa_meth); + } + OPENSSL_free(ret); + return NULL; +} + +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_ex_data_class, 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_ex_data_class, dest, &dest->ex_data); + if (!CRYPTO_dup_ex_data(&g_ex_data_class, &dest->ex_data, + &src->ex_data)) { + return NULL; + } + + /* 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) { + 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); + 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; +} + +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_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) { + 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(); + point = EC_POINT_new(eckey->group); + + if (ctx == NULL || + point == 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; + } + /* testing whether pub_key * order is the point at infinity */ + /* TODO(fork): can this be skipped if the cofactor is one or if we're about + * to check the private key, below? */ + order = &eckey->group->order; + if (BN_is_zero(order)) { + OPENSSL_PUT_ERROR(EC, EC_R_INVALID_GROUP_ORDER); + goto err; + } + if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) { + OPENSSL_PUT_ERROR(EC, ERR_R_EC_LIB); + goto err; + } + if (!EC_POINT_is_at_infinity(eckey->group, point)) { + OPENSSL_PUT_ERROR(EC, 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) { + OPENSSL_PUT_ERROR(EC, EC_R_WRONG_ORDER); + goto err; + } + if (!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_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(); + point = EC_POINT_new(key->group); + + if (ctx == NULL || + point == NULL) { + goto err; + } + + tx = BN_CTX_get(ctx); + ty = BN_CTX_get(ctx); + + 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_free(ctx); + EC_POINT_free(point); + return ok; +} + +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) { + OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + + order = BN_new(); + ctx = BN_CTX_new(); + + if (order == NULL || + ctx == NULL) { + goto err; + } + + if (eckey->priv_key == NULL) { + priv_key = BN_new(); + if (priv_key == NULL) { + goto err; + } + } else { + priv_key = eckey->priv_key; + } + + if (!EC_GROUP_get_order(eckey->group, order, ctx)) { + goto err; + } + + do { + if (!BN_rand_range(priv_key, order)) { + goto err; + } + } while (BN_is_zero(priv_key)); + + 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, 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_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, + CRYPTO_EX_dup *dup_func, + CRYPTO_EX_free *free_func) { + int index; + if (!CRYPTO_get_ex_new_index(&g_ex_data_class, &index, argl, argp, new_func, + 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) {} |