| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2003-2004, Instant802 Networks, Inc. |
| 3 | * Copyright 2005-2006, Devicescape Software, Inc. |
| 4 | * Copyright 2014-2015, Qualcomm Atheros, Inc. |
| 5 | * |
| 6 | * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/scatterlist.h> |
| 17 | #include <crypto/aead.h> |
| 18 | |
| 19 | #include "aead_api.h" |
| 20 | |
| 21 | int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len, |
| 22 | u8 *data, size_t data_len, u8 *mic) |
| 23 | { |
| 24 | size_t mic_len = crypto_aead_authsize(tfm); |
| 25 | struct scatterlist sg[3]; |
| 26 | struct aead_request *aead_req; |
| 27 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); |
| 28 | u8 *__aad; |
| 29 | |
| 30 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
| 31 | if (!aead_req) |
| 32 | return -ENOMEM; |
| 33 | |
| 34 | __aad = (u8 *)aead_req + reqsize; |
| 35 | memcpy(__aad, aad, aad_len); |
| 36 | |
| 37 | sg_init_table(sg, 3); |
| 38 | sg_set_buf(&sg[0], __aad, aad_len); |
| 39 | sg_set_buf(&sg[1], data, data_len); |
| 40 | sg_set_buf(&sg[2], mic, mic_len); |
| 41 | |
| 42 | aead_request_set_tfm(aead_req, tfm); |
| 43 | aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); |
| 44 | aead_request_set_ad(aead_req, sg[0].length); |
| 45 | |
| 46 | crypto_aead_encrypt(aead_req); |
| 47 | kzfree(aead_req); |
| 48 | |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len, |
| 53 | u8 *data, size_t data_len, u8 *mic) |
| 54 | { |
| 55 | size_t mic_len = crypto_aead_authsize(tfm); |
| 56 | struct scatterlist sg[3]; |
| 57 | struct aead_request *aead_req; |
| 58 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); |
| 59 | u8 *__aad; |
| 60 | int err; |
| 61 | |
| 62 | if (data_len == 0) |
| 63 | return -EINVAL; |
| 64 | |
| 65 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
| 66 | if (!aead_req) |
| 67 | return -ENOMEM; |
| 68 | |
| 69 | __aad = (u8 *)aead_req + reqsize; |
| 70 | memcpy(__aad, aad, aad_len); |
| 71 | |
| 72 | sg_init_table(sg, 3); |
| 73 | sg_set_buf(&sg[0], __aad, aad_len); |
| 74 | sg_set_buf(&sg[1], data, data_len); |
| 75 | sg_set_buf(&sg[2], mic, mic_len); |
| 76 | |
| 77 | aead_request_set_tfm(aead_req, tfm); |
| 78 | aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0); |
| 79 | aead_request_set_ad(aead_req, sg[0].length); |
| 80 | |
| 81 | err = crypto_aead_decrypt(aead_req); |
| 82 | kzfree(aead_req); |
| 83 | |
| 84 | return err; |
| 85 | } |
| 86 | |
| 87 | struct crypto_aead * |
| 88 | aead_key_setup_encrypt(const char *alg, const u8 key[], |
| 89 | size_t key_len, size_t mic_len) |
| 90 | { |
| 91 | struct crypto_aead *tfm; |
| 92 | int err; |
| 93 | |
| 94 | tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC); |
| 95 | if (IS_ERR(tfm)) |
| 96 | return tfm; |
| 97 | |
| 98 | err = crypto_aead_setkey(tfm, key, key_len); |
| 99 | if (err) |
| 100 | goto free_aead; |
| 101 | err = crypto_aead_setauthsize(tfm, mic_len); |
| 102 | if (err) |
| 103 | goto free_aead; |
| 104 | |
| 105 | return tfm; |
| 106 | |
| 107 | free_aead: |
| 108 | crypto_free_aead(tfm); |
| 109 | return ERR_PTR(err); |
| 110 | } |
| 111 | |
| 112 | void aead_key_free(struct crypto_aead *tfm) |
| 113 | { |
| 114 | crypto_free_aead(tfm); |
| 115 | } |