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/*
* Copyright 2020-2021 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 <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "internal/cryptlib.h"
#include "crypto/ecx.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#ifdef S390X_EC_ASM
# include "s390x_arch.h"
#endif
static OSSL_FUNC_keyexch_newctx_fn x25519_newctx;
static OSSL_FUNC_keyexch_newctx_fn x448_newctx;
static OSSL_FUNC_keyexch_init_fn ecx_init;
static OSSL_FUNC_keyexch_set_peer_fn ecx_set_peer;
static OSSL_FUNC_keyexch_derive_fn ecx_derive;
static OSSL_FUNC_keyexch_freectx_fn ecx_freectx;
static OSSL_FUNC_keyexch_dupctx_fn ecx_dupctx;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes ECX_KEY structures, so
* we use that here too.
*/
typedef struct {
size_t keylen;
ECX_KEY *key;
ECX_KEY *peerkey;
} PROV_ECX_CTX;
static void *ecx_newctx(void *provctx, size_t keylen)
{
PROV_ECX_CTX *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(PROV_ECX_CTX));
if (ctx == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
ctx->keylen = keylen;
return ctx;
}
static void *x25519_newctx(void *provctx)
{
return ecx_newctx(provctx, X25519_KEYLEN);
}
static void *x448_newctx(void *provctx)
{
return ecx_newctx(provctx, X448_KEYLEN);
}
static int ecx_init(void *vecxctx, void *vkey,
ossl_unused const OSSL_PARAM params[])
{
PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
ECX_KEY *key = vkey;
if (!ossl_prov_is_running())
return 0;
if (ecxctx == NULL
|| key == NULL
|| key->keylen != ecxctx->keylen
|| !ossl_ecx_key_up_ref(key)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
return 0;
}
ossl_ecx_key_free(ecxctx->key);
ecxctx->key = key;
return 1;
}
static int ecx_set_peer(void *vecxctx, void *vkey)
{
PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
ECX_KEY *key = vkey;
if (!ossl_prov_is_running())
return 0;
if (ecxctx == NULL
|| key == NULL
|| key->keylen != ecxctx->keylen
|| !ossl_ecx_key_up_ref(key)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
return 0;
}
ossl_ecx_key_free(ecxctx->peerkey);
ecxctx->peerkey = key;
return 1;
}
static int ecx_derive(void *vecxctx, unsigned char *secret, size_t *secretlen,
size_t outlen)
{
PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
if (!ossl_prov_is_running())
return 0;
if (ecxctx->key == NULL
|| ecxctx->key->privkey == NULL
|| ecxctx->peerkey == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);
return 0;
}
if (!ossl_assert(ecxctx->keylen == X25519_KEYLEN
|| ecxctx->keylen == X448_KEYLEN)) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
if (secret == NULL) {
*secretlen = ecxctx->keylen;
return 1;
}
if (outlen < ecxctx->keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
if (ecxctx->keylen == X25519_KEYLEN) {
#ifdef S390X_EC_ASM
if (OPENSSL_s390xcap_P.pcc[1]
& S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X25519)) {
if (s390x_x25519_mul(secret, ecxctx->peerkey->pubkey,
ecxctx->key->privkey) == 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
return 0;
}
} else
#endif
if (X25519(secret, ecxctx->key->privkey, ecxctx->peerkey->pubkey) == 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
return 0;
}
} else {
#ifdef S390X_EC_ASM
if (OPENSSL_s390xcap_P.pcc[1]
& S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X448)) {
if (s390x_x448_mul(secret, ecxctx->peerkey->pubkey,
ecxctx->key->privkey) == 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
return 0;
}
} else
#endif
if (X448(secret, ecxctx->key->privkey, ecxctx->peerkey->pubkey) == 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
return 0;
}
}
*secretlen = ecxctx->keylen;
return 1;
}
static void ecx_freectx(void *vecxctx)
{
PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
ossl_ecx_key_free(ecxctx->key);
ossl_ecx_key_free(ecxctx->peerkey);
OPENSSL_free(ecxctx);
}
static void *ecx_dupctx(void *vecxctx)
{
PROV_ECX_CTX *srcctx = (PROV_ECX_CTX *)vecxctx;
PROV_ECX_CTX *dstctx;
if (!ossl_prov_is_running())
return NULL;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
*dstctx = *srcctx;
if (dstctx->key != NULL && !ossl_ecx_key_up_ref(dstctx->key)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
OPENSSL_free(dstctx);
return NULL;
}
if (dstctx->peerkey != NULL && !ossl_ecx_key_up_ref(dstctx->peerkey)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
ossl_ecx_key_free(dstctx->key);
OPENSSL_free(dstctx);
return NULL;
}
return dstctx;
}
const OSSL_DISPATCH ossl_x25519_keyexch_functions[] = {
{ OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))x25519_newctx },
{ OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))ecx_init },
{ OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))ecx_derive },
{ OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))ecx_set_peer },
{ OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))ecx_freectx },
{ OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))ecx_dupctx },
{ 0, NULL }
};
const OSSL_DISPATCH ossl_x448_keyexch_functions[] = {
{ OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))x448_newctx },
{ OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))ecx_init },
{ OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))ecx_derive },
{ OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))ecx_set_peer },
{ OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))ecx_freectx },
{ OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))ecx_dupctx },
{ 0, NULL }
};
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