librecmc-fossil/trunk/package/kernel/mac80211/patches/100-remove-cryptoapi-dependencies.patch

--- a/net/mac80211/Kconfig
+++ b/net/mac80211/Kconfig
@@ -5,8 +5,6 @@ config MAC80211
 	depends on CRYPTO
 	depends on CRYPTO_ARC4
 	depends on CRYPTO_AES
-	select BPAUTO_CRYPTO_CCM
-	depends on CRYPTO_GCM
 	depends on CRC32
 	select BPAUTO_AVERAGE
 	---help---
--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -15,9 +15,7 @@ mac80211-y := \
 	michael.o \
 	tkip.o \
 	aes_ccm.o \
-	aes_gcm.o \
 	aes_cmac.o \
-	aes_gmac.o \
 	cfg.o \
 	ethtool.o \
 	rx.o \
--- a/net/mac80211/aes_ccm.c
+++ b/net/mac80211/aes_ccm.c
@@ -13,89 +13,132 @@
 #include <linux/types.h>
 #include <linux/err.h>
 #include <crypto/aead.h>
+#include <crypto/aes.h>
 
 #include <net/mac80211.h>
 #include "key.h"
 #include "aes_ccm.h"
 
-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
-			       u8 *data, size_t data_len, u8 *mic,
-			       size_t mic_len)
+static void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *b_0, u8 *aad, u8 *s_0,
+			    u8 *a, u8 *b)
 {
-	struct scatterlist sg[3];
+	int i;
+
+	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);
 
-	char aead_req_data[sizeof(struct aead_request) +
-			   crypto_aead_reqsize(tfm)]
-		__aligned(__alignof__(struct aead_request));
-	struct aead_request *aead_req = (void *) aead_req_data;
+	/* Mask out bits from auth-only-b_0 */
+	b_0[0] &= 0x07;
 
-	memset(aead_req, 0, sizeof(aead_req_data));
+	/* 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);
+}
 
-	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, mic_len);
 
-	aead_request_set_tfm(aead_req, tfm);
-	aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
-	aead_request_set_ad(aead_req, sg[0].length);
+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
+			       u8 *data, size_t data_len, u8 *mic,
+			       size_t mic_len)
+{
+	int i, j, last_len, num_blocks;
+	u8 b[AES_BLOCK_SIZE];
+	u8 s_0[AES_BLOCK_SIZE];
+	u8 e[AES_BLOCK_SIZE];
+	u8 *pos, *cpos;
+
+	num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
+	last_len = data_len % AES_BLOCK_SIZE;
+	aes_ccm_prepare(tfm, b_0, aad, s_0, b, b);
+
+	/* Process payload blocks */
+	pos = data;
+	cpos = data;
+	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];
+	}
 
-	crypto_aead_encrypt(aead_req);
+	for (i = 0; i < mic_len; i++)
+		mic[i] = b[i] ^ s_0[i];
 }
 
-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
 			      u8 *data, size_t data_len, u8 *mic,
 			      size_t mic_len)
 {
-	struct scatterlist sg[3];
-	char aead_req_data[sizeof(struct aead_request) +
-			   crypto_aead_reqsize(tfm)]
-		__aligned(__alignof__(struct aead_request));
-	struct aead_request *aead_req = (void *) aead_req_data;
-
-	if (data_len == 0)
-		return -EINVAL;
-
-	memset(aead_req, 0, sizeof(aead_req_data));
-
-	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, mic_len);
-
-	aead_request_set_tfm(aead_req, tfm);
-	aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
-	aead_request_set_ad(aead_req, sg[0].length);
+	int i, j, last_len, num_blocks;
+	u8 *pos, *cpos;
+	u8 a[AES_BLOCK_SIZE];
+	u8 b[AES_BLOCK_SIZE];
+	u8 s_0[AES_BLOCK_SIZE];
+
+	num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
+	last_len = data_len % AES_BLOCK_SIZE;
+	aes_ccm_prepare(tfm, b_0, aad, s_0, a, b);
+
+	/* Process payload blocks */
+	cpos = data;
+	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 < mic_len; i++) {
+		if ((mic[i] ^ s_0[i]) != a[i])
+			return -1;
+	}
 
-	return crypto_aead_decrypt(aead_req);
+	return 0;
 }
 
-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[],
-						    size_t key_len,
-						    size_t mic_len)
+struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[],
+						      size_t key_len,
+						      size_t mic_len)
 {
-	struct crypto_aead *tfm;
-	int err;
+	struct crypto_cipher *tfm;
 
-	tfm = crypto_alloc_aead("ccm(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, mic_len);
-	if (err)
-		goto free_aead;
+	tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
+	if (!IS_ERR(tfm))
+		crypto_cipher_setkey(tfm, key, key_len);
 
 	return tfm;
-
-free_aead:
-	crypto_free_aead(tfm);
-	return ERR_PTR(err);
 }
 
-void ieee80211_aes_key_free(struct crypto_aead *tfm)
+
+void ieee80211_aes_key_free(struct crypto_cipher *tfm)
 {
-	crypto_free_aead(tfm);
+	crypto_free_cipher(tfm);
 }
--- a/net/mac80211/aes_ccm.h
+++ b/net/mac80211/aes_ccm.h
@@ -12,15 +12,15 @@
 
 #include <linux/crypto.h>
 
-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[],
-						    size_t key_len,
-						    size_t mic_len);
-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[],
+						      size_t key_len,
+						      size_t mic_len);
+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
 			       u8 *data, size_t data_len, u8 *mic,
 			       size_t mic_len);
-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
 			      u8 *data, size_t data_len, u8 *mic,
 			      size_t mic_len);
-void ieee80211_aes_key_free(struct crypto_aead *tfm);
+void ieee80211_aes_key_free(struct crypto_cipher *tfm);
 
 #endif /* AES_CCM_H */
--- a/net/mac80211/aes_gcm.h
+++ b/net/mac80211/aes_gcm.h
@@ -11,12 +11,28 @@
 
 #include <linux/crypto.h>
 
-void ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
-			       u8 *data, size_t data_len, u8 *mic);
-int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
-			      u8 *data, size_t data_len, u8 *mic);
-struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
-							size_t key_len);
-void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm);
+static inline void
+ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
+			  u8 *data, size_t data_len, u8 *mic)
+{
+}
+
+static inline int
+ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
+			  u8 *data, size_t data_len, u8 *mic)
+{
+    return -EOPNOTSUPP;
+}
+
+static inline struct crypto_aead *
+ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], size_t key_len)
+{
+    return NULL;
+}
+
+static inline void
+ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
+{
+}
 
 #endif /* AES_GCM_H */
--- a/net/mac80211/aes_gmac.h
+++ b/net/mac80211/aes_gmac.h
@@ -11,10 +11,22 @@
 
 #include <linux/crypto.h>
 
-struct crypto_aead *ieee80211_aes_gmac_key_setup(const u8 key[],
-						 size_t key_len);
-int ieee80211_aes_gmac(struct crypto_aead *tfm, const u8 *aad, u8 *nonce,
-		       const u8 *data, size_t data_len, u8 *mic);
-void ieee80211_aes_gmac_key_free(struct crypto_aead *tfm);
+static inline struct crypto_aead *
+ieee80211_aes_gmac_key_setup(const u8 key[], size_t key_len)
+{
+	return NULL;
+}
+
+static inline int
+ieee80211_aes_gmac(struct crypto_aead *tfm, const u8 *aad, u8 *nonce,
+		   const u8 *data, size_t data_len, u8 *mic)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void
+ieee80211_aes_gmac_key_free(struct crypto_aead *tfm)
+{
+}
 
 #endif /* AES_GMAC_H */
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -84,7 +84,7 @@ struct ieee80211_key {
 			 * Management frames.
 			 */
 			u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
-			struct crypto_aead *tfm;
+			struct crypto_cipher *tfm;
 			u32 replays; /* dot11RSNAStatsCCMPReplays */
 		} ccmp;
 		struct {
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -304,7 +304,8 @@ ieee80211_crypto_tkip_decrypt(struct iee
 }
 
 
-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
+static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
+				u16 data_len)
 {
 	__le16 mask_fc;
 	int a4_included, mgmt;
@@ -334,14 +335,8 @@ static void ccmp_special_blocks(struct s
 	else
 		qos_tid = 0;
 
-	/* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
-	 * mode authentication are not allowed to collide, yet both are derived
-	 * from this vector b_0. We only set L := 1 here to indicate that the
-	 * data size can be represented in (L+1) bytes. The CCM layer will take
-	 * care of storing the data length in the top (L+1) bytes and setting
-	 * and clearing the other bits as is required to derive the two IVs.
-	 */
-	b_0[0] = 0x1;
+	/* First block, b_0 */
+	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
 
 	/* Nonce: Nonce Flags | A2 | PN
 	 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
@@ -349,6 +344,8 @@ static void ccmp_special_blocks(struct s
 	b_0[1] = qos_tid | (mgmt << 4);
 	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
 	memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
+	/* l(m) */
+	put_unaligned_be16(data_len, &b_0[14]);
 
 	/* AAD (extra authenticate-only data) / masked 802.11 header
 	 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
@@ -460,7 +457,7 @@ static int ccmp_encrypt_skb(struct ieee8
 		return 0;
 
 	pos += IEEE80211_CCMP_HDR_LEN;
-	ccmp_special_blocks(skb, pn, b_0, aad);
+	ccmp_special_blocks(skb, pn, b_0, aad, len);
 	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
 				  skb_put(skb, mic_len), mic_len);
 
@@ -531,7 +528,7 @@ ieee80211_crypto_ccmp_decrypt(struct iee
 			u8 aad[2 * AES_BLOCK_SIZE];
 			u8 b_0[AES_BLOCK_SIZE];
 			/* hardware didn't decrypt/verify MIC */
-			ccmp_special_blocks(skb, pn, b_0, aad);
+			ccmp_special_blocks(skb, pn, b_0, aad, data_len);
 
 			if (ieee80211_aes_ccm_decrypt(
 				    key->u.ccmp.tfm, b_0, aad,