357 lines
15 KiB
C
357 lines
15 KiB
C
/* Originally written by Bodo Moeller for the OpenSSL project.
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* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* Portions of the attached software ("Contribution") are developed by
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* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
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*
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* The Contribution is licensed pursuant to the OpenSSL open source
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* license provided above.
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*
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* The elliptic curve binary polynomial software is originally written by
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* Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems
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* Laboratories. */
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#ifndef OPENSSL_HEADER_EC_KEY_H
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#define OPENSSL_HEADER_EC_KEY_H
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#include <openssl/base.h>
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#include <openssl/ec.h>
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#include <openssl/engine.h>
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#include <openssl/ex_data.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// ec_key.h contains functions that handle elliptic-curve points that are
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// public/private keys.
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// EC key objects.
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//
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// An |EC_KEY| object represents a public or private EC key. A given object may
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// be used concurrently on multiple threads by non-mutating functions, provided
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// no other thread is concurrently calling a mutating function. Unless otherwise
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// documented, functions which take a |const| pointer are non-mutating and
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// functions which take a non-|const| pointer are mutating.
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// EC_KEY_new returns a fresh |EC_KEY| object or NULL on error.
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OPENSSL_EXPORT EC_KEY *EC_KEY_new(void);
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// EC_KEY_new_method acts the same as |EC_KEY_new|, but takes an explicit
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// |ENGINE|.
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OPENSSL_EXPORT EC_KEY *EC_KEY_new_method(const ENGINE *engine);
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// EC_KEY_new_by_curve_name returns a fresh EC_KEY for group specified by |nid|
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// or NULL on error.
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OPENSSL_EXPORT EC_KEY *EC_KEY_new_by_curve_name(int nid);
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// EC_KEY_free frees all the data owned by |key| and |key| itself.
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OPENSSL_EXPORT void EC_KEY_free(EC_KEY *key);
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// EC_KEY_dup returns a fresh copy of |src| or NULL on error.
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OPENSSL_EXPORT EC_KEY *EC_KEY_dup(const EC_KEY *src);
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// EC_KEY_up_ref increases the reference count of |key| and returns one. It does
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// not mutate |key| for thread-safety purposes and may be used concurrently.
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OPENSSL_EXPORT int EC_KEY_up_ref(EC_KEY *key);
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// EC_KEY_is_opaque returns one if |key| is opaque and doesn't expose its key
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// material. Otherwise it return zero.
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OPENSSL_EXPORT int EC_KEY_is_opaque(const EC_KEY *key);
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// EC_KEY_get0_group returns a pointer to the |EC_GROUP| object inside |key|.
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OPENSSL_EXPORT const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
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// EC_KEY_set_group sets the |EC_GROUP| object that |key| will use to |group|.
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// It returns one on success and zero if |key| is already configured with a
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// different group.
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OPENSSL_EXPORT int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
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// EC_KEY_get0_private_key returns a pointer to the private key inside |key|.
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OPENSSL_EXPORT const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
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// EC_KEY_set_private_key sets the private key of |key| to |priv|. It returns
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// one on success and zero otherwise. |key| must already have had a group
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// configured (see |EC_KEY_set_group| and |EC_KEY_new_by_curve_name|).
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OPENSSL_EXPORT int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
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// EC_KEY_get0_public_key returns a pointer to the public key point inside
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// |key|.
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OPENSSL_EXPORT const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
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// EC_KEY_set_public_key sets the public key of |key| to |pub|, by copying it.
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// It returns one on success and zero otherwise. |key| must already have had a
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// group configured (see |EC_KEY_set_group| and |EC_KEY_new_by_curve_name|), and
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// |pub| must also belong to that group.
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OPENSSL_EXPORT int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
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#define EC_PKEY_NO_PARAMETERS 0x001
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#define EC_PKEY_NO_PUBKEY 0x002
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// EC_KEY_get_enc_flags returns the encoding flags for |key|, which is a
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// bitwise-OR of |EC_PKEY_*| values.
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OPENSSL_EXPORT unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
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// EC_KEY_set_enc_flags sets the encoding flags for |key|, which is a
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// bitwise-OR of |EC_PKEY_*| values.
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OPENSSL_EXPORT void EC_KEY_set_enc_flags(EC_KEY *key, unsigned flags);
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// EC_KEY_get_conv_form returns the conversation form that will be used by
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// |key|.
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OPENSSL_EXPORT point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
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// EC_KEY_set_conv_form sets the conversion form to be used by |key|.
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OPENSSL_EXPORT void EC_KEY_set_conv_form(EC_KEY *key,
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point_conversion_form_t cform);
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// EC_KEY_check_key performs several checks on |key| (possibly including an
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// expensive check that the public key is in the primary subgroup). It returns
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// one if all checks pass and zero otherwise. If it returns zero then detail
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// about the problem can be found on the error stack.
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OPENSSL_EXPORT int EC_KEY_check_key(const EC_KEY *key);
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// EC_KEY_check_fips performs a signing pairwise consistency test (FIPS 140-2
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// 4.9.2). It returns one if it passes and zero otherwise.
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OPENSSL_EXPORT int EC_KEY_check_fips(const EC_KEY *key);
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// EC_KEY_set_public_key_affine_coordinates sets the public key in |key| to
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// (|x|, |y|). It returns one on success and zero otherwise.
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OPENSSL_EXPORT int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key,
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const BIGNUM *x,
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const BIGNUM *y);
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// EC_KEY_key2buf encodes the public key in |key| to an allocated octet string
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// and sets |*out_buf| to point to it. It returns the length of the encoded
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// octet string or zero if an error occurred.
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OPENSSL_EXPORT size_t EC_KEY_key2buf(EC_KEY *key, point_conversion_form_t form,
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unsigned char **out_buf, BN_CTX *ctx);
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// Key generation.
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// EC_KEY_generate_key generates a random, private key, calculates the
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// corresponding public key and stores both in |key|. It returns one on success
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// or zero otherwise.
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OPENSSL_EXPORT int EC_KEY_generate_key(EC_KEY *key);
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// EC_KEY_generate_key_fips behaves like |EC_KEY_generate_key| but performs
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// additional checks for FIPS compliance.
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OPENSSL_EXPORT int EC_KEY_generate_key_fips(EC_KEY *key);
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// Serialisation.
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// EC_KEY_parse_private_key parses a DER-encoded ECPrivateKey structure (RFC
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// 5915) from |cbs| and advances |cbs|. It returns a newly-allocated |EC_KEY| or
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// NULL on error. If |group| is non-null, the parameters field of the
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// ECPrivateKey may be omitted (but must match |group| if present). Otherwise,
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// the parameters field is required.
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OPENSSL_EXPORT EC_KEY *EC_KEY_parse_private_key(CBS *cbs,
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const EC_GROUP *group);
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// EC_KEY_marshal_private_key marshals |key| as a DER-encoded ECPrivateKey
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// structure (RFC 5915) and appends the result to |cbb|. It returns one on
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// success and zero on failure. |enc_flags| is a combination of |EC_PKEY_*|
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// values and controls whether corresponding fields are omitted.
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OPENSSL_EXPORT int EC_KEY_marshal_private_key(CBB *cbb, const EC_KEY *key,
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unsigned enc_flags);
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// EC_KEY_parse_curve_name parses a DER-encoded OBJECT IDENTIFIER as a curve
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// name from |cbs| and advances |cbs|. It returns a newly-allocated |EC_GROUP|
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// or NULL on error.
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OPENSSL_EXPORT EC_GROUP *EC_KEY_parse_curve_name(CBS *cbs);
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// EC_KEY_marshal_curve_name marshals |group| as a DER-encoded OBJECT IDENTIFIER
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// and appends the result to |cbb|. It returns one on success and zero on
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// failure.
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OPENSSL_EXPORT int EC_KEY_marshal_curve_name(CBB *cbb, const EC_GROUP *group);
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// EC_KEY_parse_parameters parses a DER-encoded ECParameters structure (RFC
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// 5480) from |cbs| and advances |cbs|. It returns a newly-allocated |EC_GROUP|
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// or NULL on error. It supports the namedCurve and specifiedCurve options, but
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// use of specifiedCurve is deprecated. Use |EC_KEY_parse_curve_name|
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// instead.
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OPENSSL_EXPORT EC_GROUP *EC_KEY_parse_parameters(CBS *cbs);
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// ex_data functions.
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//
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// These functions are wrappers. See |ex_data.h| for details.
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OPENSSL_EXPORT int EC_KEY_get_ex_new_index(long argl, void *argp,
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CRYPTO_EX_unused *unused,
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CRYPTO_EX_dup *dup_unused,
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CRYPTO_EX_free *free_func);
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OPENSSL_EXPORT int EC_KEY_set_ex_data(EC_KEY *r, int idx, void *arg);
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OPENSSL_EXPORT void *EC_KEY_get_ex_data(const EC_KEY *r, int idx);
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// ECDSA method.
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// ECDSA_FLAG_OPAQUE specifies that this ECDSA_METHOD does not expose its key
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// material. This may be set if, for instance, it is wrapping some other crypto
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// API, like a platform key store.
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#define ECDSA_FLAG_OPAQUE 1
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// ecdsa_method_st is a structure of function pointers for implementing ECDSA.
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// See engine.h.
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struct ecdsa_method_st {
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struct openssl_method_common_st common;
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void *app_data;
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int (*init)(EC_KEY *key);
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int (*finish)(EC_KEY *key);
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// group_order_size returns the number of bytes needed to represent the order
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// of the group. This is used to calculate the maximum size of an ECDSA
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// signature in |ECDSA_size|.
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size_t (*group_order_size)(const EC_KEY *key);
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// sign matches the arguments and behaviour of |ECDSA_sign|.
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int (*sign)(const uint8_t *digest, size_t digest_len, uint8_t *sig,
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unsigned int *sig_len, EC_KEY *eckey);
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int flags;
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};
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// Deprecated functions.
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// EC_KEY_set_asn1_flag does nothing.
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OPENSSL_EXPORT void EC_KEY_set_asn1_flag(EC_KEY *key, int flag);
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// d2i_ECPrivateKey parses an ASN.1, DER-encoded, private key from |len| bytes
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// at |*inp|. If |out_key| is not NULL then, on exit, a pointer to the result
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// is in |*out_key|. Note that, even if |*out_key| is already non-NULL on entry,
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// it * will not be written to. Rather, a fresh |EC_KEY| is allocated and the
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// previous * one is freed. On successful exit, |*inp| is advanced past the DER
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// structure. It returns the result or NULL on error.
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//
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// On input, if |*out_key| is non-NULL and has a group configured, the
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// parameters field may be omitted but must match that group if present.
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//
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// Use |EC_KEY_parse_private_key| instead.
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OPENSSL_EXPORT EC_KEY *d2i_ECPrivateKey(EC_KEY **out_key, const uint8_t **inp,
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long len);
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// i2d_ECPrivateKey marshals an EC private key from |key| to an ASN.1, DER
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// structure. If |outp| is not NULL then the result is written to |*outp| and
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// |*outp| is advanced just past the output. It returns the number of bytes in
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// the result, whether written or not, or a negative value on error.
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//
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// Use |EC_KEY_marshal_private_key| instead.
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OPENSSL_EXPORT int i2d_ECPrivateKey(const EC_KEY *key, uint8_t **outp);
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// d2i_ECParameters parses an ASN.1, DER-encoded, set of EC parameters from
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// |len| bytes at |*inp|. If |out_key| is not NULL then, on exit, a pointer to
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// the result is in |*out_key|. Note that, even if |*out_key| is already
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// non-NULL on entry, it will not be written to. Rather, a fresh |EC_KEY| is
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// allocated and the previous one is freed. On successful exit, |*inp| is
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// advanced past the DER structure. It returns the result or NULL on error.
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//
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// Use |EC_KEY_parse_parameters| or |EC_KEY_parse_curve_name| instead.
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OPENSSL_EXPORT EC_KEY *d2i_ECParameters(EC_KEY **out_key, const uint8_t **inp,
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long len);
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// i2d_ECParameters marshals EC parameters from |key| to an ASN.1, DER
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// structure. If |outp| is not NULL then the result is written to |*outp| and
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// |*outp| is advanced just past the output. It returns the number of bytes in
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// the result, whether written or not, or a negative value on error.
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//
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// Use |EC_KEY_marshal_curve_name| instead.
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OPENSSL_EXPORT int i2d_ECParameters(const EC_KEY *key, uint8_t **outp);
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// o2i_ECPublicKey parses an EC point from |len| bytes at |*inp| into
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// |*out_key|. Note that this differs from the d2i format in that |*out_key|
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// must be non-NULL with a group set. On successful exit, |*inp| is advanced by
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// |len| bytes. It returns |*out_key| or NULL on error.
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//
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// Use |EC_POINT_oct2point| instead.
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OPENSSL_EXPORT EC_KEY *o2i_ECPublicKey(EC_KEY **out_key, const uint8_t **inp,
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long len);
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// i2o_ECPublicKey marshals an EC point from |key|. If |outp| is not NULL then
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// the result is written to |*outp| and |*outp| is advanced just past the
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// output. It returns the number of bytes in the result, whether written or
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// not, or a negative value on error.
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//
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// Use |EC_POINT_point2cbb| instead.
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OPENSSL_EXPORT int i2o_ECPublicKey(const EC_KEY *key, unsigned char **outp);
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#if defined(__cplusplus)
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} // extern C
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extern "C++" {
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BSSL_NAMESPACE_BEGIN
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BORINGSSL_MAKE_DELETER(EC_KEY, EC_KEY_free)
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BORINGSSL_MAKE_UP_REF(EC_KEY, EC_KEY_up_ref)
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BSSL_NAMESPACE_END
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} // extern C++
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#endif
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#endif // OPENSSL_HEADER_EC_KEY_H
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