| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright 2003-2004, Instant802 Networks, Inc. |
| 4 | * Copyright 2005-2006, Devicescape Software, Inc. |
| 5 | * Copyright 2014-2015, Qualcomm Atheros, Inc. |
| 6 | * |
| 7 | * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/scatterlist.h> |
| 14 | #include <crypto/aead.h> |
| 15 | |
| 16 | #include "aead_api.h" |
| 17 | |
| 18 | int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len, |
| 19 | u8 *data, size_t data_len, u8 *mic) |
| 20 | { |
| 21 | size_t mic_len = crypto_aead_authsize(tfm); |
| 22 | struct scatterlist sg[3]; |
| 23 | struct aead_request *aead_req; |
| 24 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); |
| 25 | u8 *__aad; |
| 26 | |
| 27 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
| 28 | if (!aead_req) |
| 29 | return -ENOMEM; |
| 30 | |
| 31 | __aad = (u8 *)aead_req + reqsize; |
| 32 | memcpy(__aad, aad, aad_len); |
| 33 | |
| 34 | sg_init_table(sg, 3); |
| 35 | sg_set_buf(&sg[0], __aad, aad_len); |
| 36 | sg_set_buf(&sg[1], data, data_len); |
| 37 | sg_set_buf(&sg[2], mic, mic_len); |
| 38 | |
| 39 | aead_request_set_tfm(aead_req, tfm); |
| 40 | aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); |
| 41 | aead_request_set_ad(aead_req, sg[0].length); |
| 42 | |
| 43 | crypto_aead_encrypt(aead_req); |
| 44 | kzfree(aead_req); |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len, |
| 50 | u8 *data, size_t data_len, u8 *mic) |
| 51 | { |
| 52 | size_t mic_len = crypto_aead_authsize(tfm); |
| 53 | struct scatterlist sg[3]; |
| 54 | struct aead_request *aead_req; |
| 55 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); |
| 56 | u8 *__aad; |
| 57 | int err; |
| 58 | |
| 59 | if (data_len == 0) |
| 60 | return -EINVAL; |
| 61 | |
| 62 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
| 63 | if (!aead_req) |
| 64 | return -ENOMEM; |
| 65 | |
| 66 | __aad = (u8 *)aead_req + reqsize; |
| 67 | memcpy(__aad, aad, aad_len); |
| 68 | |
| 69 | sg_init_table(sg, 3); |
| 70 | sg_set_buf(&sg[0], __aad, aad_len); |
| 71 | sg_set_buf(&sg[1], data, data_len); |
| 72 | sg_set_buf(&sg[2], mic, mic_len); |
| 73 | |
| 74 | aead_request_set_tfm(aead_req, tfm); |
| 75 | aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0); |
| 76 | aead_request_set_ad(aead_req, sg[0].length); |
| 77 | |
| 78 | err = crypto_aead_decrypt(aead_req); |
| 79 | kzfree(aead_req); |
| 80 | |
| 81 | return err; |
| 82 | } |
| 83 | |
| 84 | struct crypto_aead * |
| 85 | aead_key_setup_encrypt(const char *alg, const u8 key[], |
| 86 | size_t key_len, size_t mic_len) |
| 87 | { |
| 88 | struct crypto_aead *tfm; |
| 89 | int err; |
| 90 | |
| 91 | tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC); |
| 92 | if (IS_ERR(tfm)) |
| 93 | return tfm; |
| 94 | |
| 95 | err = crypto_aead_setkey(tfm, key, key_len); |
| 96 | if (err) |
| 97 | goto free_aead; |
| 98 | err = crypto_aead_setauthsize(tfm, mic_len); |
| 99 | if (err) |
| 100 | goto free_aead; |
| 101 | |
| 102 | return tfm; |
| 103 | |
| 104 | free_aead: |
| 105 | crypto_free_aead(tfm); |
| 106 | return ERR_PTR(err); |
| 107 | } |
| 108 | |
| 109 | void aead_key_free(struct crypto_aead *tfm) |
| 110 | { |
| 111 | crypto_free_aead(tfm); |
| 112 | } |