/* * Copyright 2014-2015, Qualcomm Atheros, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include "key.h" #include "aes_gcm.h" int ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, u8 *data, size_t data_len, u8 *mic) { struct scatterlist sg[3]; struct aead_request *aead_req; int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); u8 *__aad; aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC); if (!aead_req) return -ENOMEM; __aad = (u8 *)aead_req + reqsize; memcpy(__aad, aad, GCM_AAD_LEN); sg_init_table(sg, 3); sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad)); sg_set_buf(&sg[1], data, data_len); sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); aead_request_set_tfm(aead_req, tfm); aead_request_set_crypt(aead_req, sg, sg, data_len, j_0); aead_request_set_ad(aead_req, sg[0].length); crypto_aead_encrypt(aead_req); kzfree(aead_req); return 0; } int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, u8 *data, size_t data_len, u8 *mic) { 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 + GCM_AAD_LEN, GFP_ATOMIC); if (!aead_req) return -ENOMEM; __aad = (u8 *)aead_req + reqsize; memcpy(__aad, aad, GCM_AAD_LEN); sg_init_table(sg, 3); sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad)); sg_set_buf(&sg[1], data, data_len); sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); aead_request_set_tfm(aead_req, tfm); aead_request_set_crypt(aead_req, sg, sg, data_len + IEEE80211_GCMP_MIC_LEN, j_0); aead_request_set_ad(aead_req, sg[0].length); err = crypto_aead_decrypt(aead_req); kzfree(aead_req); return err; } struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], size_t key_len) { struct crypto_aead *tfm; int err; tfm = crypto_alloc_aead("gcm(aes)", 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, IEEE80211_GCMP_MIC_LEN); if (err) goto free_aead; return tfm; free_aead: crypto_free_aead(tfm); return ERR_PTR(err); } void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm) { crypto_free_aead(tfm); }

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