diff options
Diffstat (limited to 'net/mac80211/aes_ccm.c')
| -rw-r--r-- | net/mac80211/aes_ccm.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/net/mac80211/aes_ccm.c b/net/mac80211/aes_ccm.c deleted file mode 100644 index be7614b9ed27..000000000000 --- a/net/mac80211/aes_ccm.c +++ /dev/null @@ -1,150 +0,0 @@ -/* - * Copyright 2003-2004, Instant802 Networks, Inc. - * Copyright 2005-2006, Devicescape Software, 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 <linux/kernel.h> -#include <linux/types.h> -#include <linux/crypto.h> -#include <linux/err.h> -#include <crypto/aes.h> - -#include <net/mac80211.h> -#include "key.h" -#include "aes_ccm.h" - -static void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *scratch, u8 *a) -{ - int i; - u8 *b_0, *aad, *b, *s_0; - - b_0 = scratch + 3 * AES_BLOCK_SIZE; - aad = scratch + 4 * AES_BLOCK_SIZE; - b = scratch; - s_0 = scratch + AES_BLOCK_SIZE; - - crypto_cipher_encrypt_one(tfm, b, b_0); - - /* Extra Authenticate-only data (always two AES blocks) */ - for (i = 0; i < AES_BLOCK_SIZE; i++) - aad[i] ^= b[i]; - crypto_cipher_encrypt_one(tfm, b, aad); - - aad += AES_BLOCK_SIZE; - - for (i = 0; i < AES_BLOCK_SIZE; i++) - aad[i] ^= b[i]; - crypto_cipher_encrypt_one(tfm, a, aad); - - /* Mask out bits from auth-only-b_0 */ - b_0[0] &= 0x07; - - /* S_0 is used to encrypt T (= MIC) */ - b_0[14] = 0; - b_0[15] = 0; - crypto_cipher_encrypt_one(tfm, s_0, b_0); -} - - -void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch, - u8 *data, size_t data_len, - u8 *cdata, u8 *mic) -{ - int i, j, last_len, num_blocks; - u8 *pos, *cpos, *b, *s_0, *e, *b_0; - - b = scratch; - s_0 = scratch + AES_BLOCK_SIZE; - e = scratch + 2 * AES_BLOCK_SIZE; - b_0 = scratch + 3 * AES_BLOCK_SIZE; - - num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE); - last_len = data_len % AES_BLOCK_SIZE; - aes_ccm_prepare(tfm, scratch, b); - - /* Process payload blocks */ - pos = data; - cpos = cdata; - for (j = 1; j <= num_blocks; j++) { - int blen = (j == num_blocks && last_len) ? - last_len : AES_BLOCK_SIZE; - - /* Authentication followed by encryption */ - for (i = 0; i < blen; i++) - b[i] ^= pos[i]; - crypto_cipher_encrypt_one(tfm, b, b); - - b_0[14] = (j >> 8) & 0xff; - b_0[15] = j & 0xff; - crypto_cipher_encrypt_one(tfm, e, b_0); - for (i = 0; i < blen; i++) - *cpos++ = *pos++ ^ e[i]; - } - - for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++) - mic[i] = b[i] ^ s_0[i]; -} - - -int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch, - u8 *cdata, size_t data_len, u8 *mic, u8 *data) -{ - int i, j, last_len, num_blocks; - u8 *pos, *cpos, *b, *s_0, *a, *b_0; - - b = scratch; - s_0 = scratch + AES_BLOCK_SIZE; - a = scratch + 2 * AES_BLOCK_SIZE; - b_0 = scratch + 3 * AES_BLOCK_SIZE; - - num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE); - last_len = data_len % AES_BLOCK_SIZE; - aes_ccm_prepare(tfm, scratch, a); - - /* Process payload blocks */ - cpos = cdata; - pos = data; - for (j = 1; j <= num_blocks; j++) { - int blen = (j == num_blocks && last_len) ? - last_len : AES_BLOCK_SIZE; - - /* Decryption followed by authentication */ - b_0[14] = (j >> 8) & 0xff; - b_0[15] = j & 0xff; - crypto_cipher_encrypt_one(tfm, b, b_0); - for (i = 0; i < blen; i++) { - *pos = *cpos++ ^ b[i]; - a[i] ^= *pos++; - } - crypto_cipher_encrypt_one(tfm, a, a); - } - - for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++) { - if ((mic[i] ^ s_0[i]) != a[i]) - return -1; - } - - return 0; -} - - -struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[]) -{ - struct crypto_cipher *tfm; - - tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); - if (!IS_ERR(tfm)) - crypto_cipher_setkey(tfm, key, WLAN_KEY_LEN_CCMP); - - return tfm; -} - - -void ieee80211_aes_key_free(struct crypto_cipher *tfm) -{ - crypto_free_cipher(tfm); -} |