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      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 
     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 
     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 
     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