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