providers/implementations/ciphers/cipher_aes_gcm.c

   1 /*
   2  * Copyright 2019-2020 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
  22 static void *aes_gcm_newctx(void *provctx, size_t keybits)
  23 {
  24     PROV_AES_GCM_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
  25
  26     if (ctx != NULL)
  27         gcm_initctx(provctx, &ctx->base, keybits, PROV_AES_HW_gcm(keybits), 8);
  28     return ctx;
  29 }
  30
  31 static OSSL_OP_cipher_freectx_fn aes_gcm_freectx;
  32 static void aes_gcm_freectx(void *vctx)
  33 {
  34     PROV_AES_GCM_CTX *ctx = (PROV_AES_GCM_CTX *)vctx;
  35
  36     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  37 }
  38
  39 /* aes128gcm_functions */
  40 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 128, 8, 96);
  41 /* aes192gcm_functions */
  42 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 192, 8, 96);
  43 /* aes256gcm_functions */
  44 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 256, 8, 96);