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* [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32
@ 2019-10-06 14:07 Thomas Meyer
  2019-10-07 14:09 ` Dan Carpenter
  0 siblings, 1 reply; 5+ messages in thread
From: Thomas Meyer @ 2019-10-06 14:07 UTC (permalink / raw)
  To: gregkh; +Cc: devel, Thomas Meyer

Use lib/crc32 instead of another implementation.

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
---
 drivers/staging/wlan-ng/p80211wep.c | 64 ++---------------------------
 1 file changed, 3 insertions(+), 61 deletions(-)

diff --git a/drivers/staging/wlan-ng/p80211wep.c b/drivers/staging/wlan-ng/p80211wep.c
index 8bd92bba0ac15..51d917c8cdc82 100644
--- a/drivers/staging/wlan-ng/p80211wep.c
+++ b/drivers/staging/wlan-ng/p80211wep.c
@@ -49,6 +49,7 @@
 /*================================================================*/
 /* System Includes */
 
+#include <linux/crc32.h>
 #include <linux/netdevice.h>
 #include <linux/wireless.h>
 #include <linux/random.h>
@@ -61,61 +62,6 @@
 
 #define WEP_KEY(x)       (((x) & 0xC0) >> 6)
 
-static const u32 wep_crc32_table[256] = {
-	0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
-	0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
-	0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
-	0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
-	0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
-	0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
-	0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
-	0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
-	0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
-	0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
-	0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
-	0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
-	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
-	0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
-	0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
-	0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
-	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
-	0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
-	0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
-	0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
-	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
-	0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
-	0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
-	0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
-	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
-	0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
-	0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
-	0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
-	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
-	0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
-	0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
-	0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
-	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
-	0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
-	0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
-	0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
-	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
-	0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
-	0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
-	0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
-	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
-	0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
-	0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
-	0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
-	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
-	0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
-	0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
-	0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
-	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
-	0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
-	0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
-	0x2d02ef8dL
-};
-
 /* keylen in bytes! */
 
 int wep_change_key(struct wlandevice *wlandev, int keynum, u8 *key, int keylen)
@@ -184,7 +130,6 @@ int wep_decrypt(struct wlandevice *wlandev, u8 *buf, u32 len, int key_override,
 	}
 
 	/* Apply the RC4 to the data, update the CRC32 */
-	crc = ~0;
 	i = 0;
 	j = 0;
 	for (k = 0; k < len; k++) {
@@ -192,9 +137,8 @@ int wep_decrypt(struct wlandevice *wlandev, u8 *buf, u32 len, int key_override,
 		j = (j + s[i]) & 0xff;
 		swap(i, j);
 		buf[k] ^= s[(s[i] + s[j]) & 0xff];
-		crc = wep_crc32_table[(crc ^ buf[k]) & 0xff] ^ (crc >> 8);
 	}
-	crc = ~crc;
+	crc = ~crc32_le(~0, buf, len);
 
 	/* now let's check the crc */
 	c_crc[0] = crc;
@@ -257,17 +201,15 @@ int wep_encrypt(struct wlandevice *wlandev, u8 *buf,
 	}
 
 	/* Update CRC32 then apply RC4 to the data */
-	crc = ~0;
 	i = 0;
 	j = 0;
 	for (k = 0; k < len; k++) {
-		crc = wep_crc32_table[(crc ^ buf[k]) & 0xff] ^ (crc >> 8);
 		i = (i + 1) & 0xff;
 		j = (j + s[i]) & 0xff;
 		swap(i, j);
 		dst[k] = buf[k] ^ s[(s[i] + s[j]) & 0xff];
 	}
-	crc = ~crc;
+	crc = ~crc32_le(~0, buf, len);
 
 	/* now let's encrypt the crc */
 	icv[0] = crc;
-- 
2.21.0

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http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32
  2019-10-06 14:07 [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32 Thomas Meyer
@ 2019-10-07 14:09 ` Dan Carpenter
  2019-10-07 16:15   ` Thomas Meyer
  0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2019-10-07 14:09 UTC (permalink / raw)
  To: Thomas Meyer; +Cc: devel, gregkh

On Sun, Oct 06, 2019 at 04:07:45PM +0200, Thomas Meyer wrote:
> Use lib/crc32 instead of another implementation.
> 
> Signed-off-by: Thomas Meyer <thomas@m3y3r.de>

I always get annoyed whenever anyone asks if people have tested their
patches, but have you tested this?  It's hard for me to review it
because I don't have the relevant background and because I'm a little
bit stupid.

regards,
dan carpenter

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32
  2019-10-07 14:09 ` Dan Carpenter
@ 2019-10-07 16:15   ` Thomas Meyer
  2019-10-08  6:17     ` Dan Carpenter
  0 siblings, 1 reply; 5+ messages in thread
From: Thomas Meyer @ 2019-10-07 16:15 UTC (permalink / raw)
  To: Dan Carpenter; +Cc: devel, gregkh

Dan Carpenter <dan.carpenter@oracle.com> writes:

> On Sun, Oct 06, 2019 at 04:07:45PM +0200, Thomas Meyer wrote:
>> Use lib/crc32 instead of another implementation.
>> 
>> Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
>
> I always get annoyed whenever anyone asks if people have tested their
> patches, but have you tested this?

no annoynence on my side, but... :-)

Good question. I tell you what I did and then you tell me if I did test!

So I did this: I did write a small C program that does contain a small
byte buffer and the extracted CRC32 logic from the wlan driver.
The program does calculate the CRC32 sum with the extracted logic and by
calling crc32_le function. but values are the same.

But as I don't own the hardware I couldn't do a real test with WEP (as
far as I understand only WEP on this hardware would be affected.)

So a better test would be to find someone which actually owns the
hardware and could test the change.

so... what do you think?

with kind regards
thomas

>It's hard for me to review it
> because I don't have the relevant background and because I'm a little
> bit stupid.
>
> regards,
> dan carpenter
_______________________________________________
devel mailing list
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^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32
  2019-10-07 16:15   ` Thomas Meyer
@ 2019-10-08  6:17     ` Dan Carpenter
  2019-10-08 19:01       ` Thomas Meyer
  0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2019-10-08  6:17 UTC (permalink / raw)
  To: Thomas Meyer; +Cc: devel, gregkh

On Mon, Oct 07, 2019 at 06:15:23PM +0200, Thomas Meyer wrote:
> Dan Carpenter <dan.carpenter@oracle.com> writes:
> 
> > On Sun, Oct 06, 2019 at 04:07:45PM +0200, Thomas Meyer wrote:
> >> Use lib/crc32 instead of another implementation.
> >> 
> >> Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
> >
> > I always get annoyed whenever anyone asks if people have tested their
> > patches, but have you tested this?
> 
> no annoynence on my side, but... :-)
> 
> Good question. I tell you what I did and then you tell me if I did test!
> 
> So I did this: I did write a small C program that does contain a small
> byte buffer and the extracted CRC32 logic from the wlan driver.
> The program does calculate the CRC32 sum with the extracted logic and by
> calling crc32_le function. but values are the same.
> 
> But as I don't own the hardware I couldn't do a real test with WEP (as
> far as I understand only WEP on this hardware would be affected.)
> 
> So a better test would be to find someone which actually owns the
> hardware and could test the change.
> 
> so... what do you think?

Could you send your test program?

Anyway your testing sounds reasonable so I'm fine with this change.

regards,
dan carpenter

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32
  2019-10-08  6:17     ` Dan Carpenter
@ 2019-10-08 19:01       ` Thomas Meyer
  0 siblings, 0 replies; 5+ messages in thread
From: Thomas Meyer @ 2019-10-08 19:01 UTC (permalink / raw)
  To: Dan Carpenter; +Cc: devel, gregkh

Dan Carpenter <dan.carpenter@oracle.com> writes:

> On Mon, Oct 07, 2019 at 06:15:23PM +0200, Thomas Meyer wrote:
>> Dan Carpenter <dan.carpenter@oracle.com> writes:
>> 
>> so... what do you think?
>
> Could you send your test program?

sure, here you go:

cc crc32.c -o crc32 lib/crc32.o

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

typedef uint8_t u8;
typedef uint32_t u32;

static const u32 wep_crc32_table[256] = {
       0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
       0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
       0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
       0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
       0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
       0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
       0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
       0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
       0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
       0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
       0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
       0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
       0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
       0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
       0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
       0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
       0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
       0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
       0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
       0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
       0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
       0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
       0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
       0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
       0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
       0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
       0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
       0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
       0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
       0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
       0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
       0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
       0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
       0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
       0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
       0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
       0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
       0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
       0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
       0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
       0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
       0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
       0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
       0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
       0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
       0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
       0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
       0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
       0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
       0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
       0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
       0x2d02ef8dL
};

u32 crc32_le(u32 crc, unsigned char const *p, size_t len);
u32 crc32_be(u32 crc, unsigned char const *p, size_t len);

void main(void) {
  u8 buf[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  int len = sizeof(buf);

  printf("sizeof buf=%d\n", len);

  u32 crc = ~0;
  u32 k;

// loop1
//  for (k = 0; k < len; k++) {
//       crc = wep_crc32_table[(crc ^ buf[k]) & 0xff] ^ (crc >> 8);
//       //               i = (i + 1) & 0xff;
//       //       j = (j + s[i]) & 0xff;
//       //       swap(i, j);
//       //       dst[k] = buf[k] ^ s[(s[i] + s[j]) & 0xff];
//  }

// loop2
  for (k = 0; k < len; k++) {
    //i = (i + 1) & 0xff;
    //j = (j + s[i]) & 0xff;
    //swap(i, j);
    //buf[k] ^= s[(s[i] + s[j]) & 0xff];
    crc = wep_crc32_table[(crc ^ buf[k]) & 0xff] ^ (crc >> 8);
  }

  crc = ~crc;
  printf("crc32_homemade= %x\n", crc);

  crc = ~crc32_le(~0, buf, len);
  printf("crc32_le= %x\n", crc);

  crc = ~crc32_be(~0, buf, len);
  printf("crc32_be= %x\n", crc);
}


I noticed that I only did test one of the two loops in the driver, but
as none of two seems to modify the buf content 
with kind regards
thomas
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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-06 14:07 [PATCH] staging: wlan-ng: p80211wep.c: use lib/crc32 Thomas Meyer
2019-10-07 14:09 ` Dan Carpenter
2019-10-07 16:15   ` Thomas Meyer
2019-10-08  6:17     ` Dan Carpenter
2019-10-08 19:01       ` Thomas Meyer

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