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/*
* Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/deprecated.h"
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/ec.h>
#include "crypto/evp.h"
#include "crypto/ec.h"
/*
* This file is meant to contain functions to provide EVP_PKEY support for EC
* keys.
*/
static ossl_inline
int evp_pkey_ctx_getset_ecdh_param_checks(const EVP_PKEY_CTX *ctx)
{
if (ctx == NULL || !EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
/* Uses the same return values as EVP_PKEY_CTX_ctrl */
return -2;
}
/* If key type not EC return error */
if (evp_pkey_ctx_is_legacy(ctx)
&& ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_EC)
return -1;
return 1;
}
int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode)
{
int ret;
OSSL_PARAM params[2], *p = params;
ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
if (ret != 1)
return ret;
/*
* Valid input values are:
* * 0 for disable
* * 1 for enable
* * -1 for reset to default for associated priv key
*/
if (cofactor_mode < -1 || cofactor_mode > 1) {
/* Uses the same return value of pkey_ec_ctrl() */
return -2;
}
*p++ = OSSL_PARAM_construct_int(OSSL_EXCHANGE_PARAM_EC_ECDH_COFACTOR_MODE,
&cofactor_mode);
*p++ = OSSL_PARAM_construct_end();
ret = evp_pkey_ctx_set_params_strict(ctx, params);
if (ret == -2)
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
return ret;
}
int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx)
{
int ret, mode;
OSSL_PARAM params[2], *p = params;
ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
if (ret != 1)
return ret;
*p++ = OSSL_PARAM_construct_int(OSSL_EXCHANGE_PARAM_EC_ECDH_COFACTOR_MODE,
&mode);
*p++ = OSSL_PARAM_construct_end();
ret = evp_pkey_ctx_get_params_strict(ctx, params);
switch (ret) {
case -2:
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
break;
case 1:
ret = mode;
if (mode < 0 || mode > 1) {
/*
* The provider should return either 0 or 1, any other value is a
* provider error.
*/
ret = -1;
}
break;
default:
ret = -1;
break;
}
return ret;
}
/*
* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
* simply because that's easier.
*/
int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf)
{
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_DERIVE,
EVP_PKEY_CTRL_EC_KDF_TYPE, kdf, NULL);
}
/*
* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
* simply because that's easier.
*/
int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx)
{
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_DERIVE,
EVP_PKEY_CTRL_EC_KDF_TYPE, -2, NULL);
}
/*
* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
* simply because that's easier.
*/
int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
{
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_DERIVE,
EVP_PKEY_CTRL_EC_KDF_MD, 0, (void *)(md));
}
/*
* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
* simply because that's easier.
*/
int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **pmd)
{
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_DERIVE,
EVP_PKEY_CTRL_GET_EC_KDF_MD, 0, (void *)(pmd));
}
int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int outlen)
{
int ret;
size_t len = outlen;
OSSL_PARAM params[2], *p = params;
ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
if (ret != 1)
return ret;
if (outlen <= 0) {
/*
* This would ideally be -1 or 0, but we have to retain compatibility
* with legacy behaviour of EVP_PKEY_CTX_ctrl() which returned -2 if
* in <= 0
*/
return -2;
}
*p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN,
&len);
*p++ = OSSL_PARAM_construct_end();
ret = evp_pkey_ctx_set_params_strict(ctx, params);
if (ret == -2)
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
return ret;
}
int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *plen)
{
size_t len = UINT_MAX;
int ret;
OSSL_PARAM params[2], *p = params;
ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
if (ret != 1)
return ret;
*p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN,
&len);
*p++ = OSSL_PARAM_construct_end();
ret = evp_pkey_ctx_get_params_strict(ctx, params);
switch (ret) {
case -2:
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
break;
case 1:
if (len <= INT_MAX)
*plen = (int)len;
else
ret = -1;
break;
default:
ret = -1;
break;
}
return ret;
}
int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len)
{
int ret;
OSSL_PARAM params[2], *p = params;
ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
if (ret != 1)
return ret;
*p++ = OSSL_PARAM_construct_octet_string(OSSL_EXCHANGE_PARAM_KDF_UKM,
/*
* Cast away the const. This is read
* only so should be safe
*/
(void *)ukm,
(size_t)len);
*p++ = OSSL_PARAM_construct_end();
ret = evp_pkey_ctx_set_params_strict(ctx, params);
switch (ret) {
case -2:
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
break;
case 1:
OPENSSL_free(ukm);
break;
}
return ret;
}
#ifndef OPENSSL_NO_DEPRECATED_3_0
int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
{
size_t ukmlen;
int ret;
OSSL_PARAM params[2], *p = params;
ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
if (ret != 1)
return ret;
*p++ = OSSL_PARAM_construct_octet_ptr(OSSL_EXCHANGE_PARAM_KDF_UKM,
(void **)pukm, 0);
*p++ = OSSL_PARAM_construct_end();
ret = evp_pkey_ctx_get_params_strict(ctx, params);
switch (ret) {
case -2:
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
break;
case 1:
ret = -1;
ukmlen = params[0].return_size;
if (ukmlen <= INT_MAX)
ret = (int)ukmlen;
break;
default:
ret = -1;
break;
}
return ret;
}
#endif
#ifndef FIPS_MODULE
/*
* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
* simply because that's easier.
* ASN1_OBJECT (which would be converted to text internally)?
*/
int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid)
{
int keytype = nid == EVP_PKEY_SM2 ? EVP_PKEY_SM2 : EVP_PKEY_EC;
return EVP_PKEY_CTX_ctrl(ctx, keytype, EVP_PKEY_OP_TYPE_GEN,
EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID,
nid, NULL);
}
/*
* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
* simply because that's easier.
*/
int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int param_enc)
{
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_TYPE_GEN,
EVP_PKEY_CTRL_EC_PARAM_ENC, param_enc, NULL);
}
#endif
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