Release 4.7 net/mac80211/aes_cmac.c
/*
* AES-128-CMAC with TLen 16 for IEEE 802.11w BIP
* Copyright 2008, Jouni Malinen <j@w1.fi>
*
* 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/export.h>
#include <linux/err.h>
#include <crypto/aes.h>
#include <net/mac80211.h>
#include "key.h"
#include "aes_cmac.h"
#define CMAC_TLEN 8
/* CMAC TLen = 64 bits (8 octets) */
#define CMAC_TLEN_256 16
/* CMAC TLen = 128 bits (16 octets) */
#define AAD_LEN 20
static void gf_mulx(u8 *pad)
{
int i, carry;
carry = pad[0] & 0x80;
for (i = 0; i < AES_BLOCK_SIZE - 1; i++)
pad[i] = (pad[i] << 1) | (pad[i + 1] >> 7);
pad[AES_BLOCK_SIZE - 1] <<= 1;
if (carry)
pad[AES_BLOCK_SIZE - 1] ^= 0x87;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 86 | 100.00% | 1 | 100.00% |
| Total | 86 | 100.00% | 1 | 100.00% |
static void aes_cmac_vector(struct crypto_cipher *tfm, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac,
size_t mac_len)
{
u8 cbc[AES_BLOCK_SIZE], pad[AES_BLOCK_SIZE];
const u8 *pos, *end;
size_t i, e, left, total_len;
memset(cbc, 0, AES_BLOCK_SIZE);
total_len = 0;
for (e = 0; e < num_elem; e++)
total_len += len[e];
left = total_len;
e = 0;
pos = addr[0];
end = pos + len[0];
while (left >= AES_BLOCK_SIZE) {
for (i = 0; i < AES_BLOCK_SIZE; i++) {
cbc[i] ^= *pos++;
if (pos >= end) {
e++;
pos = addr[e];
end = pos + len[e];
}
}
if (left > AES_BLOCK_SIZE)
crypto_cipher_encrypt_one(tfm, cbc, cbc);
left -= AES_BLOCK_SIZE;
}
memset(pad, 0, AES_BLOCK_SIZE);
crypto_cipher_encrypt_one(tfm, pad, pad);
gf_mulx(pad);
if (left || total_len == 0) {
for (i = 0; i < left; i++) {
cbc[i] ^= *pos++;
if (pos >= end) {
e++;
pos = addr[e];
end = pos + len[e];
}
}
cbc[left] ^= 0x80;
gf_mulx(pad);
}
for (i = 0; i < AES_BLOCK_SIZE; i++)
pad[i] ^= cbc[i];
crypto_cipher_encrypt_one(tfm, pad, pad);
memcpy(mac, pad, mac_len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 325 | 97.89% | 2 | 50.00% |
johannes berg | johannes berg | 7 | 2.11% | 2 | 50.00% |
| Total | 332 | 100.00% | 4 | 100.00% |
void ieee80211_aes_cmac(struct crypto_cipher *tfm, const u8 *aad,
const u8 *data, size_t data_len, u8 *mic)
{
const u8 *addr[3];
size_t len[3];
u8 zero[CMAC_TLEN];
memset(zero, 0, CMAC_TLEN);
addr[0] = aad;
len[0] = AAD_LEN;
addr[1] = data;
len[1] = data_len - CMAC_TLEN;
addr[2] = zero;
len[2] = CMAC_TLEN;
aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 115 | 100.00% | 2 | 100.00% |
| Total | 115 | 100.00% | 2 | 100.00% |
void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
const u8 *data, size_t data_len, u8 *mic)
{
const u8 *addr[3];
size_t len[3];
u8 zero[CMAC_TLEN_256];
memset(zero, 0, CMAC_TLEN_256);
addr[0] = aad;
len[0] = AAD_LEN;
addr[1] = data;
len[1] = data_len - CMAC_TLEN_256;
addr[2] = zero;
len[2] = CMAC_TLEN_256;
aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN_256);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 115 | 100.00% | 2 | 100.00% |
| Total | 115 | 100.00% | 2 | 100.00% |
struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
size_t key_len)
{
struct crypto_cipher *tfm;
tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
if (!IS_ERR(tfm))
crypto_cipher_setkey(tfm, key, key_len);
return tfm;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 50 | 98.04% | 2 | 66.67% |
ben hutchings | ben hutchings | 1 | 1.96% | 1 | 33.33% |
| Total | 51 | 100.00% | 3 | 100.00% |
void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm)
{
crypto_free_cipher(tfm);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jouni malinen | jouni malinen | 742 | 98.15% | 2 | 28.57% |
johannes berg | johannes berg | 10 | 1.32% | 3 | 42.86% |
emmanuel grumbach | emmanuel grumbach | 3 | 0.40% | 1 | 14.29% |
ben hutchings | ben hutchings | 1 | 0.13% | 1 | 14.29% |
| Total | 756 | 100.00% | 7 | 100.00% |
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