116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/*
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* Copyright 2003-2004, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2014-2015, Qualcomm Atheros, Inc.
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*
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* Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/scatterlist.h>
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#include <crypto/aead.h>
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#include "aead_api.h"
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int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
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u8 *data, size_t data_len, u8 *mic)
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{
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size_t mic_len = crypto_aead_authsize(tfm);
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struct scatterlist sg[3];
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struct aead_request *aead_req;
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int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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u8 *__aad;
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aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
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if (!aead_req)
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return -ENOMEM;
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__aad = (u8 *)aead_req + reqsize;
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memcpy(__aad, aad, aad_len);
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sg_init_table(sg, 3);
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sg_set_buf(&sg[0], __aad, aad_len);
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sg_set_buf(&sg[1], data, data_len);
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sg_set_buf(&sg[2], mic, mic_len);
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
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aead_request_set_ad(aead_req, sg[0].length);
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crypto_aead_encrypt(aead_req);
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kzfree(aead_req);
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return 0;
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}
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int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
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u8 *data, size_t data_len, u8 *mic)
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{
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size_t mic_len = crypto_aead_authsize(tfm);
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struct scatterlist sg[3];
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struct aead_request *aead_req;
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int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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u8 *__aad;
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int err;
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if (data_len == 0)
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return -EINVAL;
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aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
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if (!aead_req)
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return -ENOMEM;
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__aad = (u8 *)aead_req + reqsize;
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memcpy(__aad, aad, aad_len);
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sg_init_table(sg, 3);
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sg_set_buf(&sg[0], __aad, aad_len);
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sg_set_buf(&sg[1], data, data_len);
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sg_set_buf(&sg[2], mic, mic_len);
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
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aead_request_set_ad(aead_req, sg[0].length);
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err = crypto_aead_decrypt(aead_req);
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kzfree(aead_req);
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return err;
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}
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struct crypto_aead *
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aead_key_setup_encrypt(const char *alg, const u8 key[],
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size_t key_len, size_t mic_len)
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{
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struct crypto_aead *tfm;
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int err;
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tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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return tfm;
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err = crypto_aead_setkey(tfm, key, key_len);
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if (err)
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goto free_aead;
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err = crypto_aead_setauthsize(tfm, mic_len);
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if (err)
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goto free_aead;
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return tfm;
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free_aead:
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crypto_free_aead(tfm);
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return ERR_PTR(err);
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}
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void aead_key_free(struct crypto_aead *tfm)
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{
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crypto_free_aead(tfm);
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}
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