--- /dev/null
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sat, 7 Oct 2017 09:37:28 +0200
+Subject: [PATCH] Revert "mac80211: aes-cmac: switch to shash CMAC
+ driver"
+
+This reverts commit 26717828b75dd5c46e97f7f4a9b937d038bb2852.
+Reduces mac80211 dependencies for LEDE
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/aes_cmac.c
++++ b/net/mac80211/aes_cmac.c
+@@ -22,50 +22,126 @@
+ #define CMAC_TLEN_256 16 /* CMAC TLen = 128 bits (16 octets) */
+ #define AAD_LEN 20
+
+-static const u8 zero[CMAC_TLEN_256];
+
+-void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
+- const u8 *data, size_t data_len, u8 *mic)
++void gf_mulx(u8 *pad)
+ {
+- SHASH_DESC_ON_STACK(desc, tfm);
+- u8 out[AES_BLOCK_SIZE];
++ int i, carry;
+
+- desc->tfm = tfm;
++ 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;
++}
+
+- crypto_shash_init(desc);
+- crypto_shash_update(desc, aad, AAD_LEN);
+- crypto_shash_update(desc, data, data_len - CMAC_TLEN);
+- crypto_shash_finup(desc, zero, CMAC_TLEN, out);
++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;
+
+- memcpy(mic, out, CMAC_TLEN);
++ 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);
+ }
+
+-void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad,
++
++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);
++}
++
++void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
+ const u8 *data, size_t data_len, u8 *mic)
+ {
+- SHASH_DESC_ON_STACK(desc, tfm);
++ const u8 *addr[3];
++ size_t len[3];
++ u8 zero[CMAC_TLEN_256];
+
+- desc->tfm = tfm;
++ 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;
+
+- crypto_shash_init(desc);
+- crypto_shash_update(desc, aad, AAD_LEN);
+- crypto_shash_update(desc, data, data_len - CMAC_TLEN_256);
+- crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic);
++ aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN_256);
+ }
+
+-struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
+- size_t key_len)
++struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
++ size_t key_len)
+ {
+- struct crypto_shash *tfm;
++ struct crypto_cipher *tfm;
+
+- tfm = crypto_alloc_shash("cmac(aes)", 0, 0);
++ tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
+ if (!IS_ERR(tfm))
+- crypto_shash_setkey(tfm, key, key_len);
++ crypto_cipher_setkey(tfm, key, key_len);
+
+ return tfm;
+ }
+
+-void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
++
++void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm)
+ {
+- crypto_free_shash(tfm);
++ crypto_free_cipher(tfm);
+ }
+--- a/net/mac80211/aes_cmac.h
++++ b/net/mac80211/aes_cmac.h
+@@ -10,14 +10,13 @@
+ #define AES_CMAC_H
+
+ #include <linux/crypto.h>
+-#include <crypto/hash.h>
+
+-struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
+- size_t key_len);
+-void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
++struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
++ size_t key_len);
++void ieee80211_aes_cmac(struct crypto_cipher *tfm, const u8 *aad,
+ const u8 *data, size_t data_len, u8 *mic);
+-void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad,
++void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
+ const u8 *data, size_t data_len, u8 *mic);
+-void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm);
++void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm);
+
+ #endif /* AES_CMAC_H */
+--- a/net/mac80211/key.h
++++ b/net/mac80211/key.h
+@@ -93,7 +93,7 @@ struct ieee80211_key {
+ } ccmp;
+ struct {
+ u8 rx_pn[IEEE80211_CMAC_PN_LEN];
+- struct crypto_shash *tfm;
++ struct crypto_cipher *tfm;
+ u32 replays; /* dot11RSNAStatsCMACReplays */
+ u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
+ } aes_cmac;
projects / openwrt / staging / jow.git / blobdiff