providers/implementations/ciphers/cipher_aes_gcm.c

   1 /*
   2  * Copyright 2019 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 AES GCM mode */
  11
  12 #include "prov/ciphercommon.h"
  13 #include "prov/cipher_gcm.h"
  14 #include "internal/provider_algs.h"
  15
  16 static void *aes_gcm_newctx(void *provctx, size_t keybits)
  17 {
  18     PROV_AES_GCM_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
  19
  20     if (ctx != NULL)
  21         gcm_initctx(provctx, &ctx->base, keybits, PROV_AES_HW_gcm(keybits), 8);
  22     return ctx;
  23 }
  24
  25 static OSSL_OP_cipher_freectx_fn aes_gcm_freectx;
  26 static void aes_gcm_freectx(void *vctx)
  27 {
  28     PROV_AES_GCM_CTX *ctx = (PROV_AES_GCM_CTX *)vctx;
  29
  30     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  31 }
  32
  33 /* aes128gcm_functions */
  34 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 128, 8, 96);
  35 /* aes192gcm_functions */
  36 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 192, 8, 96);
  37 /* aes256gcm_functions */
  38 IMPLEMENT_aead_cipher(aes, gcm, GCM, AEAD_FLAGS, 256, 8, 96);