md5 testing fail big and small letter difference?

Shou Miko · Jun 30, 2012

i downloaded a mkv test file and it's md5 file and when i checked with Exact File 1.0.0.15 Beta it failed, than i decided to make the md5 myself and it's the same just with small letters not big as in the md5 can that really be corrupted file or just my checking program that files?

Code:

md5 (that came with the file):	B8B0EE60F76BE1D67DC946C963686796

md5 (i made with Exact File): 	b8b0ee60f76be1d67dc946c963686796

when i look they r exactly the same, but can big and small letters really cause the md5 to fail? :wtf:

FordGT90Concept · Jun 30, 2012

MD5 hashes only has 16 values per digit (0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f). They are case insensitive.

If you really want to make sure it is a match, download the trial of Hex Workshop from Breakingpoint Software, go to Tools -> Compare -> Compare Files and do a resync compare of the files. If it doesn't say the result is completely matched, they aren't identical. It can generate MD5s, SHA-1, CRC, etc. hashes too ("Generate Checksum" option).

If a program compares the string case sensitively, they don't match. If they compare case insensitively, they do. Here's the hex...

Code:

B8B0EE60F76BE1D67DC946C963686796 = 42:38:42:30:45:45:36:30:46:37:36:42:45:31:44:36:37:44:43:39:34:36:43:39:36:33:36:38:36:37:39:36
b8b0ee60f76be1d67dc946c963686796 = 62:38:62:30:65:65:36:30:66:37:36:62:65:31:64:36:37:64:63:39:34:36:63:39:36:33:36:38:36:37:39:36

42 is obviously not equal to 62. If it were case insensitive, they would equal.

Shou Miko · Jun 30, 2012

oki, so can u tell me why Exact File says fail and QuickSFV just says "FAILED. Could not find related SFV file" and there was only a md5 with it.

well not gonna go that deep just wondering if it was the difference between big and small letters that did the difference ^^

FordGT90Concept · Jun 30, 2012

Edited my post.

I don't bother with SFV files and I don't know why anyone does. The transmission protocol itself is supposed to take care of that.

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System Name	Lynni PS \ Lenowo TwinkPad T480
Processor	AMD Ryzen 7 7700 Raphael \ i7-8550U Kaby Lake-R
Motherboard	ASRock B650M PG Riptide Bios v. 2.02 AMD AGESA 1.1.0.0 \ Lenowo 20L60036MX Bios 1.47
Cooling	Noctua NH-D15 Chromax.Black (Only middle fan) \ Lenowo WN-2
Memory	G.Skill Flare X5 2x16GB DDR5 6000MHZ CL36-36-36-96 AMD EXPO \ Willk Elektronik 2x16GB 2666MHZ CL17
Video Card(s)	Asus GeForce RTX™ 4070 Dual OC GPU: 2325-2355 MEM: 1462\| Nvidia GeForce MX™ 150 2GB GDDR5 Micron
Storage	Gigabyte M30 1TB\|Sabrent Rocket 2TB\| HDD: 10TB\|1TB \ SKHynix 256GB 2242 3x2 \| WD SN700 1TB
Display(s)	LG UltraGear 27GP850-B 1440p@165Hz \| LG 48CX OLED 4K HDR \| AUO 14" 1440p IPS
Case	Asus Prime AP201 White Mesh \| Lenowo T480 chassis
Audio Device(s)	Steelseries Arctis Pro Wireless
Power Supply	Be Quiet! Pure Power 12 M 750W Goldie \| 65W
Mouse	Logitech G305 Lightspeedy Wireless \| Lenowo TouchPad & Logitech G305
Keyboard	Akko 3108 DS Horizon V2 Cream Yellow \| T480 UK Lumi
Software	Win11 Pro 23H2 UK
Benchmark Scores	3DMARK: https://www.3dmark.com/3dm/89434432? GPU-Z: https://www.techpowerup.com/gpuz/details/v3zbr

System Name	BY-2021
Processor	AMD Ryzen 7 5800X (65w eco profile)
Motherboard	MSI B550 Gaming Plus
Cooling	Scythe Mugen (rev 5)
Memory	2 x Kingston HyperX DDR4-3200 32 GiB
Video Card(s)	AMD Radeon RX 7900 XT
Storage	Samsung 980 Pro, Seagate Exos X20 TB 7200 RPM
Display(s)	Nixeus NX-EDG274K (3840x2160@144 DP) + Samsung SyncMaster 906BW (1440x900@60 HDMI-DVI)
Case	Coolermaster HAF 932 w/ USB 3.0 5.25" bay + USB 3.2 (A+C) 3.5" bay
Audio Device(s)	Realtek ALC1150, Micca OriGen+
Power Supply	Enermax Platimax 850w
Mouse	Nixeus REVEL-X
Keyboard	Tesoro Excalibur
Software	Windows 10 Home 64-bit
Benchmark Scores	Faster than the tortoise; slower than the hare.

md5 testing fail big and small letter difference?

Shou Miko

FordGT90Concept

"I go fast!1!11!1!"

Shou Miko

FordGT90Concept

"I go fast!1!11!1!"