1 /*
2 * Copyright 2021-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /* Dispatch functions for SM4 GCM mode */
11
12 #include "cipher_sm4_gcm.h"
13 #include "prov/implementations.h"
14 #include "prov/providercommon.h"
15
16 static OSSL_FUNC_cipher_freectx_fn sm4_gcm_freectx;
17
sm4_gcm_newctx(void * provctx,size_t keybits)18 static void *sm4_gcm_newctx(void *provctx, size_t keybits)
19 {
20 PROV_SM4_GCM_CTX *ctx;
21
22 if (!ossl_prov_is_running())
23 return NULL;
24
25 ctx = OPENSSL_zalloc(sizeof(*ctx));
26 if (ctx != NULL)
27 ossl_gcm_initctx(provctx, &ctx->base, keybits,
28 ossl_prov_sm4_hw_gcm(keybits));
29 return ctx;
30 }
31
sm4_gcm_dupctx(void * provctx)32 static void *sm4_gcm_dupctx(void *provctx)
33 {
34 PROV_SM4_GCM_CTX *ctx = provctx;
35 PROV_SM4_GCM_CTX *dctx = NULL;
36
37 if (ctx == NULL)
38 return NULL;
39
40 dctx = OPENSSL_memdup(ctx, sizeof(*ctx));
41 if (dctx != NULL && dctx->base.gcm.key != NULL)
42 dctx->base.gcm.key = &dctx->ks.ks;
43
44 return dctx;
45 }
46
sm4_gcm_freectx(void * vctx)47 static void sm4_gcm_freectx(void *vctx)
48 {
49 PROV_SM4_GCM_CTX *ctx = (PROV_SM4_GCM_CTX *)vctx;
50
51 OPENSSL_clear_free(ctx, sizeof(*ctx));
52 }
53
54 /* ossl_sm4128gcm_functions */
55 IMPLEMENT_aead_cipher(sm4, gcm, GCM, AEAD_FLAGS, 128, 8, 96);
56
