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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright 2003-2004, Instant802 Networks, Inc.
- * Copyright 2005-2006, Devicescape Software, Inc.
- * Copyright 2014-2015, Qualcomm Atheros, Inc.
- *
- * Rewrite: Copyright (C) 2013 Linaro Ltd <[email protected]>
- */
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/err.h>
- #include <linux/scatterlist.h>
- #include <crypto/aead.h>
- #include "aead_api.h"
- int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
- u8 *data, size_t data_len, u8 *mic)
- {
- size_t mic_len = crypto_aead_authsize(tfm);
- struct scatterlist sg[3];
- struct aead_request *aead_req;
- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
- u8 *__aad;
- int ret;
- aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
- if (!aead_req)
- return -ENOMEM;
- __aad = (u8 *)aead_req + reqsize;
- memcpy(__aad, aad, aad_len);
- sg_init_table(sg, 3);
- sg_set_buf(&sg[0], __aad, aad_len);
- sg_set_buf(&sg[1], data, data_len);
- sg_set_buf(&sg[2], mic, mic_len);
- aead_request_set_tfm(aead_req, tfm);
- aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
- aead_request_set_ad(aead_req, sg[0].length);
- ret = crypto_aead_encrypt(aead_req);
- kfree_sensitive(aead_req);
- return ret;
- }
- int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
- u8 *data, size_t data_len, u8 *mic)
- {
- size_t mic_len = crypto_aead_authsize(tfm);
- struct scatterlist sg[3];
- struct aead_request *aead_req;
- int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
- u8 *__aad;
- int err;
- if (data_len == 0)
- return -EINVAL;
- aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
- if (!aead_req)
- return -ENOMEM;
- __aad = (u8 *)aead_req + reqsize;
- memcpy(__aad, aad, aad_len);
- sg_init_table(sg, 3);
- sg_set_buf(&sg[0], __aad, aad_len);
- sg_set_buf(&sg[1], data, data_len);
- sg_set_buf(&sg[2], mic, mic_len);
- aead_request_set_tfm(aead_req, tfm);
- aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
- aead_request_set_ad(aead_req, sg[0].length);
- err = crypto_aead_decrypt(aead_req);
- kfree_sensitive(aead_req);
- return err;
- }
- struct crypto_aead *
- aead_key_setup_encrypt(const char *alg, const u8 key[],
- size_t key_len, size_t mic_len)
- {
- struct crypto_aead *tfm;
- int err;
- tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(tfm))
- return tfm;
- err = crypto_aead_setkey(tfm, key, key_len);
- if (err)
- goto free_aead;
- err = crypto_aead_setauthsize(tfm, mic_len);
- if (err)
- goto free_aead;
- return tfm;
- free_aead:
- crypto_free_aead(tfm);
- return ERR_PTR(err);
- }
- void aead_key_free(struct crypto_aead *tfm)
- {
- crypto_free_aead(tfm);
- }
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