1 files changed, 25 insertions, 101 deletions

diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c
index d0bd5fff5f0a..2fb65588490c 100644
--- a/net/mac80211/aes_cmac.c
+++ b/net/mac80211/aes_cmac.c
@@ -22,126 +22,50 @@
 #define CMAC_TLEN_256 16 /* CMAC TLen = 128 bits (16 octets) */
 #define AAD_LEN 20
 
+static const u8 zero[CMAC_TLEN_256];
 
-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;
-}
-
-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);
-}
-
-
-void ieee80211_aes_cmac(struct crypto_cipher *tfm, const u8 *aad,
+void ieee80211_aes_cmac(struct crypto_shash *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];
+	SHASH_DESC_ON_STACK(desc, tfm);
+	u8 out[AES_BLOCK_SIZE];
 
-	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;
+	desc->tfm = tfm;
 
-	aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN);
+	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);
+
+	memcpy(mic, out, CMAC_TLEN);
 }
 
-void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
+void ieee80211_aes_cmac_256(struct crypto_shash *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];
+	SHASH_DESC_ON_STACK(desc, 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;
+	desc->tfm = tfm;
 
-	aes_cmac_vector(tfm, 3, addr, len, mic, 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);
 }
 
-struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
-						   size_t key_len)
+struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
+						  size_t key_len)
 {
-	struct crypto_cipher *tfm;
+	struct crypto_shash *tfm;
 
-	tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
+	tfm = crypto_alloc_shash("cmac(aes)", 0, 0);
 	if (!IS_ERR(tfm))
-		crypto_cipher_setkey(tfm, key, key_len);
+		crypto_shash_setkey(tfm, key, key_len);
 
 	return tfm;
 }
 
-
-void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm)
+void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
 {
-	crypto_free_cipher(tfm);
+	crypto_free_shash(tfm);
 }