providers/implementations/ciphers/cipher_aes_gcm.c

   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 (ctx == NULL)
  43         return NULL;
  44
  45     dctx = OPENSSL_memdup(ctx, sizeof(*ctx));
  46     if (dctx != NULL && dctx->base.gcm.key != NULL)
  47         dctx->base.gcm.key = &dctx->ks.ks;
  48
  49     return dctx;
  50 }
  51
  52 static OSSL_FUNC_cipher_freectx_fn aes_gcm_freectx;
  53 static void aes_gcm_freectx(void *vctx)
  54 {
  55     PROV_AES_GCM_CTX *ctx = (PROV_AES_GCM_CTX *)vctx;
  56
  57     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  58 }
  59
  60 /* ossl_aes128gcm_functions */
  61 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 128, 8, 96);
  62 /* ossl_aes192gcm_functions */
  63 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 192, 8, 96);
  64 /* ossl_aes256gcm_functions */
  65 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 256, 8, 96);