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      1 /*
      2  * Copyright 2019-2023 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 /*
     11  * AES low level APIs are deprecated for public use, but still ok for internal
     12  * use where we're using them to implement the higher level EVP interface, as is
     13  * the case here.
     14  */
     15 #include "internal/deprecated.h"
     16 
     17 /* Dispatch functions for AES GCM mode */
     18 
     19 #include "cipher_aes_gcm.h"
     20 #include "prov/implementations.h"
     21 #include "prov/providercommon.h"
     22 
     23 static void *aes_gcm_newctx(void *provctx, size_t keybits)
     24 {
     25     PROV_AES_GCM_CTX *ctx;
     26 
     27     if (!ossl_prov_is_running())
     28         return NULL;
     29 
     30     ctx = OPENSSL_zalloc(sizeof(*ctx));
     31     if (ctx != NULL)
     32         ossl_gcm_initctx(provctx, &ctx->base, keybits,
     33             ossl_prov_aes_hw_gcm(keybits));
     34     return ctx;
     35 }
     36 
     37 static void *aes_gcm_dupctx(void *provctx)
     38 {
     39     PROV_AES_GCM_CTX *ctx = provctx;
     40     PROV_AES_GCM_CTX *dctx = NULL;
     41 
     42     if (!ossl_prov_is_running())
     43         return NULL;
     44 
     45     if (ctx == NULL)
     46         return NULL;
     47 
     48     dctx = OPENSSL_memdup(ctx, sizeof(*ctx));
     49     if (dctx != NULL && dctx->base.gcm.key != NULL)
     50         dctx->base.gcm.key = &dctx->ks.ks;
     51 
     52     return dctx;
     53 }
     54 
     55 static OSSL_FUNC_cipher_freectx_fn aes_gcm_freectx;
     56 static void aes_gcm_freectx(void *vctx)
     57 {
     58     PROV_AES_GCM_CTX *ctx = (PROV_AES_GCM_CTX *)vctx;
     59 
     60     OPENSSL_clear_free(ctx, sizeof(*ctx));
     61 }
     62 
     63 /* ossl_aes128gcm_functions */
     64 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 128, 8, 96);
     65 /* ossl_aes192gcm_functions */
     66 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 192, 8, 96);
     67 /* ossl_aes256gcm_functions */
     68 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 256, 8, 96);
     69