1 // SPDX-License-Identifier: GPL-2.0-only 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> 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 int ret; 27 28 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); 29 if (!aead_req) 30 return -ENOMEM; 31 32 __aad = (u8 *)aead_req + reqsize; 33 memcpy(__aad, aad, aad_len); 34 35 sg_init_table(sg, 3); 36 sg_set_buf(&sg[0], __aad, aad_len); 37 sg_set_buf(&sg[1], data, data_len); 38 sg_set_buf(&sg[2], mic, mic_len); 39 40 aead_request_set_tfm(aead_req, tfm); 41 aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); 42 aead_request_set_ad(aead_req, sg[0].length); 43 44 ret = crypto_aead_encrypt(aead_req); 45 kfree_sensitive(aead_req); 46 47 return ret; 48 } 49 50 int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len, 51 u8 *data, size_t data_len, u8 *mic) 52 { 53 size_t mic_len = crypto_aead_authsize(tfm); 54 struct scatterlist sg[3]; 55 struct aead_request *aead_req; 56 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); 57 u8 *__aad; 58 int err; 59 60 if (data_len == 0) 61 return -EINVAL; 62 63 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); 64 if (!aead_req) 65 return -ENOMEM; 66 67 __aad = (u8 *)aead_req + reqsize; 68 memcpy(__aad, aad, aad_len); 69 70 sg_init_table(sg, 3); 71 sg_set_buf(&sg[0], __aad, aad_len); 72 sg_set_buf(&sg[1], data, data_len); 73 sg_set_buf(&sg[2], mic, mic_len); 74 75 aead_request_set_tfm(aead_req, tfm); 76 aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0); 77 aead_request_set_ad(aead_req, sg[0].length); 78 79 err = crypto_aead_decrypt(aead_req); 80 kfree_sensitive(aead_req); 81 82 return err; 83 } 84 85 struct crypto_aead * 86 aead_key_setup_encrypt(const char *alg, const u8 key[], 87 size_t key_len, size_t mic_len) 88 { 89 struct crypto_aead *tfm; 90 int err; 91 92 tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC); 93 if (IS_ERR(tfm)) 94 return tfm; 95 96 err = crypto_aead_setkey(tfm, key, key_len); 97 if (err) 98 goto free_aead; 99 err = crypto_aead_setauthsize(tfm, mic_len); 100 if (err) 101 goto free_aead; 102 103 return tfm; 104 105 free_aead: 106 crypto_free_aead(tfm); 107 return ERR_PTR(err); 108 } 109 110 void aead_key_free(struct crypto_aead *tfm) 111 { 112 crypto_free_aead(tfm); 113 } 114