1 /*
2  * Copyright 2019-2024 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 CCM mode */
18 
19 #include "cipher_aes_ccm.h"
20 #include "prov/implementations.h"
21 #include "prov/providercommon.h"
22 
23 static void *aes_ccm_newctx(void *provctx, size_t keybits)
24 {
25     PROV_AES_CCM_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_ccm_initctx(&ctx->base, keybits, ossl_prov_aes_hw_ccm(keybits));
33     return ctx;
34 }
35 
36 static void *aes_ccm_dupctx(void *provctx)
37 {
38     PROV_AES_CCM_CTX *ctx = provctx;
39     PROV_AES_CCM_CTX *dupctx = NULL;
40 
41     if (ctx == NULL)
42         return NULL;
43     dupctx = OPENSSL_memdup(provctx, sizeof(*ctx));
44     if (dupctx == NULL)
45         return NULL;
46     /*
47      * ossl_cm_initctx, via the ossl_prov_aes_hw_ccm functions assign a
48      * provctx->ccm.ks.ks to the ccm context key so we need to point it to
49      * the memduped copy
50      */
51     dupctx->base.ccm_ctx.key = &dupctx->ccm.ks.ks;
52 
53     return dupctx;
54 }
55 
56 static OSSL_FUNC_cipher_freectx_fn aes_ccm_freectx;
57 static void aes_ccm_freectx(void *vctx)
58 {
59     PROV_AES_CCM_CTX *ctx = (PROV_AES_CCM_CTX *)vctx;
60 
61     OPENSSL_clear_free(ctx,  sizeof(*ctx));
62 }
63 
64 /* ossl_aes128ccm_functions */
65 IMPLEMENT_aead_cipher(aes, ccm, CCM, AEAD_FLAGS, 128, 8, 96);
66 /* ossl_aes192ccm_functions */
67 IMPLEMENT_aead_cipher(aes, ccm, CCM, AEAD_FLAGS, 192, 8, 96);
68 /* ossl_aes256ccm_functions */
69 IMPLEMENT_aead_cipher(aes, ccm, CCM, AEAD_FLAGS, 256, 8, 96);
70