Use the in-kernel function crypto_xor_cpy instead of the custom function
bitwise_xor, as using in-kernel functions is preferred over custom
implementations.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
---
 drivers/staging/rtl8723bs/core/rtw_security.c | 46 +++++++------------
 1 file changed, 17 insertions(+), 29 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_security.c b/drivers/staging/rtl8723bs/core/rtw_security.c
index e9f382c280d9..08d179857203 100644
--- a/drivers/staging/rtl8723bs/core/rtw_security.c
+++ b/drivers/staging/rtl8723bs/core/rtw_security.c
@@ -7,6 +7,7 @@
 #include <linux/crc32.h>
 #include <drv_types.h>
 #include <crypto/aes.h>
+#include <crypto/utils.h>
 
 static const char * const _security_type_str[] = {
 	"N/A",
@@ -641,7 +642,6 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
 /**** Function Prototypes ****/
 /*****************************/
 
-static void bitwise_xor(u8 *ina, u8 *inb, u8 *out);
 static void construct_mic_iv(u8 *mic_header1,
 			     signed int qc_exists,
 			     signed int a4_exists,
@@ -849,18 +849,6 @@ static void construct_ctr_preload(u8 *ctr_preload,
 	ctr_preload[15] =  (unsigned char) (c % 256);
 }
 
-/************************************/
-/* bitwise_xor()                    */
-/* A 128 bit, bitwise exclusive or  */
-/************************************/
-static void bitwise_xor(u8 *ina, u8 *inb, u8 *out)
-{
-		signed int i;
-
-		for (i = 0; i < 16; i++)
-			out[i] = ina[i] ^ inb[i];
-}
-
 static signed int aes_cipher(u8 *key, uint	hdrlen,
 			u8 *pframe, uint plen)
 {
@@ -941,13 +929,13 @@ static signed int aes_cipher(u8 *key, uint	hdrlen,
 
 	/* Calculate MIC */
 	aes128k128d(key, mic_iv, aes_out);
-	bitwise_xor(aes_out, mic_header1, chain_buffer);
+	crypto_xor_cpy(chain_buffer, aes_out, mic_header1, 16);
 	aes128k128d(key, chain_buffer, aes_out);
-	bitwise_xor(aes_out, mic_header2, chain_buffer);
+	crypto_xor_cpy(chain_buffer, aes_out, mic_header2, 16);
 	aes128k128d(key, chain_buffer, aes_out);
 
 	for (i = 0; i < num_blocks; i++) {
-		bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, &pframe[payload_index], 16);
 
 		payload_index += 16;
 		aes128k128d(key, chain_buffer, aes_out);
@@ -960,7 +948,7 @@ static signed int aes_cipher(u8 *key, uint	hdrlen,
 		for (j = 0; j < payload_remainder; j++)
 			padded_buffer[j] = pframe[payload_index++];
 
-		bitwise_xor(aes_out, padded_buffer, chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 		aes128k128d(key, chain_buffer, aes_out);
 	}
 
@@ -977,7 +965,7 @@ static signed int aes_cipher(u8 *key, uint	hdrlen,
 				      pn_vector, i+1, frtype);
 		/*  add for CONFIG_IEEE80211W, none 11w also can use */
 		aes128k128d(key, ctr_preload, aes_out);
-		bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, &pframe[payload_index], 16);
 		for (j = 0; j < 16; j++)
 			pframe[payload_index++] = chain_buffer[j];
 	}
@@ -995,7 +983,7 @@ static signed int aes_cipher(u8 *key, uint	hdrlen,
 			padded_buffer[j] = pframe[payload_index+j];
 
 		aes128k128d(key, ctr_preload, aes_out);
-		bitwise_xor(aes_out, padded_buffer, chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 		for (j = 0; j < payload_remainder; j++)
 			pframe[payload_index++] = chain_buffer[j];
 	}
@@ -1011,7 +999,7 @@ static signed int aes_cipher(u8 *key, uint	hdrlen,
 		padded_buffer[j] = pframe[j+hdrlen+8+plen];
 
 	aes128k128d(key, ctr_preload, aes_out);
-	bitwise_xor(aes_out, padded_buffer, chain_buffer);
+	crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 	for (j = 0; j < 8; j++)
 		pframe[payload_index++] = chain_buffer[j];
 
@@ -1137,7 +1125,7 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 				      frtype); /*  add for CONFIG_IEEE80211W, none 11w also can use */
 
 		aes128k128d(key, ctr_preload, aes_out);
-		bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, &pframe[payload_index], 16);
 
 		for (j = 0; j < 16; j++)
 			pframe[payload_index++] = chain_buffer[j];
@@ -1156,7 +1144,7 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 			padded_buffer[j] = pframe[payload_index+j];
 
 		aes128k128d(key, ctr_preload, aes_out);
-		bitwise_xor(aes_out, padded_buffer, chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 		for (j = 0; j < payload_remainder; j++)
 			pframe[payload_index++] = chain_buffer[j];
 	}
@@ -1187,13 +1175,13 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 
 	/* Calculate MIC */
 	aes128k128d(key, mic_iv, aes_out);
-	bitwise_xor(aes_out, mic_header1, chain_buffer);
+	crypto_xor_cpy(chain_buffer, aes_out, mic_header1, 16);
 	aes128k128d(key, chain_buffer, aes_out);
-	bitwise_xor(aes_out, mic_header2, chain_buffer);
+	crypto_xor_cpy(chain_buffer, aes_out, mic_header2, 16);
 	aes128k128d(key, chain_buffer, aes_out);
 
 	for (i = 0; i < num_blocks; i++) {
-		bitwise_xor(aes_out, &message[payload_index], chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, &message[payload_index], 16);
 
 		payload_index += 16;
 		aes128k128d(key, chain_buffer, aes_out);
@@ -1206,7 +1194,7 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 		for (j = 0; j < payload_remainder; j++)
 			padded_buffer[j] = message[payload_index++];
 
-		bitwise_xor(aes_out, padded_buffer, chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 		aes128k128d(key, chain_buffer, aes_out);
 	}
 
@@ -1223,7 +1211,7 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 				      frtype);
 		/*  add for CONFIG_IEEE80211W, none 11w also can use */
 		aes128k128d(key, ctr_preload, aes_out);
-		bitwise_xor(aes_out, &message[payload_index], chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, &message[payload_index], 16);
 		for (j = 0; j < 16; j++)
 			message[payload_index++] = chain_buffer[j];
 	}
@@ -1241,7 +1229,7 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 			padded_buffer[j] = message[payload_index+j];
 
 		aes128k128d(key, ctr_preload, aes_out);
-		bitwise_xor(aes_out, padded_buffer, chain_buffer);
+		crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 		for (j = 0; j < payload_remainder; j++)
 			message[payload_index++] = chain_buffer[j];
 	}
@@ -1256,7 +1244,7 @@ static signed int aes_decipher(u8 *key, uint	hdrlen,
 		padded_buffer[j] = message[j+hdrlen+8+plen-8];
 
 	aes128k128d(key, ctr_preload, aes_out);
-	bitwise_xor(aes_out, padded_buffer, chain_buffer);
+	crypto_xor_cpy(chain_buffer, aes_out, padded_buffer, 16);
 	for (j = 0; j < 8; j++)
 		message[payload_index++] = chain_buffer[j];
 
-- 
2.50.1