ref: 8bc69a872883224675a55db51ac8f60ab5ed9e5a
dir: /third_party/boringssl/src/crypto/evp/p_ec.c/
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 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
* licensing@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). */
#include <openssl/evp.h>
#include <string.h>
#include <openssl/bn.h>
#include <openssl/digest.h>
#include <openssl/ec.h>
#include <openssl/ec_key.h>
#include <openssl/ecdh.h>
#include <openssl/ecdsa.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/nid.h>
#include "internal.h"
#include "../fipsmodule/ec/internal.h"
#include "../internal.h"
typedef struct {
// message digest
const EVP_MD *md;
EC_GROUP *gen_group;
} EC_PKEY_CTX;
static int pkey_ec_init(EVP_PKEY_CTX *ctx) {
EC_PKEY_CTX *dctx;
dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
if (!dctx) {
return 0;
}
OPENSSL_memset(dctx, 0, sizeof(EC_PKEY_CTX));
ctx->data = dctx;
return 1;
}
static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) {
EC_PKEY_CTX *dctx, *sctx;
if (!pkey_ec_init(dst)) {
return 0;
}
sctx = src->data;
dctx = dst->data;
dctx->md = sctx->md;
return 1;
}
static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) {
EC_PKEY_CTX *dctx = ctx->data;
if (!dctx) {
return;
}
EC_GROUP_free(dctx->gen_group);
OPENSSL_free(dctx);
}
static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen,
const uint8_t *tbs, size_t tbslen) {
unsigned int sltmp;
EC_KEY *ec = ctx->pkey->pkey.ec;
if (!sig) {
*siglen = ECDSA_size(ec);
return 1;
} else if (*siglen < (size_t)ECDSA_size(ec)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (!ECDSA_sign(0, tbs, tbslen, sig, &sltmp, ec)) {
return 0;
}
*siglen = (size_t)sltmp;
return 1;
}
static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen,
const uint8_t *tbs, size_t tbslen) {
return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->pkey->pkey.ec);
}
static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key,
size_t *keylen) {
int ret;
size_t outlen;
const EC_POINT *pubkey = NULL;
EC_KEY *eckey;
if (!ctx->pkey || !ctx->peerkey) {
OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET);
return 0;
}
eckey = ctx->pkey->pkey.ec;
if (!key) {
const EC_GROUP *group;
group = EC_KEY_get0_group(eckey);
*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
return 1;
}
pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
// NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
// not an error, the result is truncated.
outlen = *keylen;
ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
if (ret < 0) {
return 0;
}
*keylen = ret;
return 1;
}
static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
EC_PKEY_CTX *dctx = ctx->data;
switch (type) {
case EVP_PKEY_CTRL_MD:
if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_DIGEST_TYPE);
return 0;
}
dctx->md = p2;
return 1;
case EVP_PKEY_CTRL_GET_MD:
*(const EVP_MD **)p2 = dctx->md;
return 1;
case EVP_PKEY_CTRL_PEER_KEY:
// Default behaviour is OK
return 1;
case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: {
EC_GROUP *group = EC_GROUP_new_by_curve_name(p1);
if (group == NULL) {
return 0;
}
EC_GROUP_free(dctx->gen_group);
dctx->gen_group = group;
return 1;
}
default:
OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED);
return 0;
}
}
static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
EC_PKEY_CTX *dctx = ctx->data;
const EC_GROUP *group = dctx->gen_group;
if (group == NULL) {
if (ctx->pkey == NULL) {
OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET);
return 0;
}
group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
}
EC_KEY *ec = EC_KEY_new();
if (ec == NULL ||
!EC_KEY_set_group(ec, group) ||
!EC_KEY_generate_key(ec)) {
EC_KEY_free(ec);
return 0;
}
EVP_PKEY_assign_EC_KEY(pkey, ec);
return 1;
}
static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
EC_PKEY_CTX *dctx = ctx->data;
if (dctx->gen_group == NULL) {
OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET);
return 0;
}
EC_KEY *ec = EC_KEY_new();
if (ec == NULL ||
!EC_KEY_set_group(ec, dctx->gen_group)) {
EC_KEY_free(ec);
return 0;
}
EVP_PKEY_assign_EC_KEY(pkey, ec);
return 1;
}
const EVP_PKEY_METHOD ec_pkey_meth = {
EVP_PKEY_EC,
pkey_ec_init,
pkey_ec_copy,
pkey_ec_cleanup,
pkey_ec_keygen,
pkey_ec_sign,
NULL /* sign_message */,
pkey_ec_verify,
NULL /* verify_message */,
NULL /* verify_recover */,
NULL /* encrypt */,
NULL /* decrypt */,
pkey_ec_derive,
pkey_ec_paramgen,
pkey_ec_ctrl,
};
int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_TYPE_GEN,
EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID, nid, NULL);
}
int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int encoding) {
// BoringSSL only supports named curve syntax.
if (encoding != OPENSSL_EC_NAMED_CURVE) {
OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_PARAMETERS);
return 0;
}
return 1;
}