// 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 <ard.biesheuvel@linaro.org> */ #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);}