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Asked: 2026-05-11T09:31:17+00:00

I have a series of hex bytes. Theoretically, the last 20 bytes are the

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I have a series of hex bytes. Theoretically, the last 20 bytes are the sha1 hash of the first part:

3F F4 E5 25 98 20 52 70 01 63 00 68 00 75 00 79 00 69 00 00 00 74 28 96 10 09 9D C9 01 00 74 A0 D7 DB 0B 9D C9 01 4D 00 79 00 47 00 72 00 6F 00 75 00 70 00 00 00 2F 00 00 00 BD 0D EA 71 BE 0B 25 75 E7 5C 58 20 31 57 F3 9A EF 69 1B FD

If I apply sha1 to them in PHP like this:

echo sha1('3FF4E525982052700163006800750079006900000074289610099DC9010074A0D7DB0B9DC9014D007900470072006F007500700000002F000000');

I get back:

d68ca0839df6e5ac7069cc548d82f249752f3acb

But I’m looking for this value: 

bd0dea71be0b2575e75c58203157f39aef691bfd    (BD 0D EA 71 BE 0B 25 75 E7 5C 58 20 31 57 F3 9A EF 69 1B FD)

Is it because I’m treating the hex values as a string? What do I need to do?

Edit:

Here’s the original information I am working from:

ticketBytes {byte[0x0000003a]}     [0x00000000]: 0x3f     [0x00000001]: 0xf4     [0x00000002]: 0xe5     [0x00000003]: 0x25     [0x00000004]: 0x98     [0x00000005]: 0x20     [0x00000006]: 0x52     [0x00000007]: 0x70     [0x00000008]: 0x01     [0x00000009]: 0x63     [0x0000000a]: 0x00     [0x0000000b]: 0x68     [0x0000000c]: 0x00     [0x0000000d]: 0x75     [0x0000000e]: 0x00     [0x0000000f]: 0x79     [0x00000010]: 0x00     [0x00000011]: 0x69     [0x00000012]: 0x00     [0x00000013]: 0x00     [0x00000014]: 0x00     [0x00000015]: 0x74     [0x00000016]: 0x28     [0x00000017]: 0x96     [0x00000018]: 0x10     [0x00000019]: 0x09     [0x0000001a]: 0x9d     [0x0000001b]: 0xc9     [0x0000001c]: 0x01     [0x0000001d]: 0x00     [0x0000001e]: 0x74     [0x0000001f]: 0xa0     [0x00000020]: 0xd7     [0x00000021]: 0xdb     [0x00000022]: 0x0b     [0x00000023]: 0x9d     [0x00000024]: 0xc9     [0x00000025]: 0x01     [0x00000026]: 0x4d     [0x00000027]: 0x00     [0x00000028]: 0x79     [0x00000029]: 0x00     [0x0000002a]: 0x47     [0x0000002b]: 0x00     [0x0000002c]: 0x72     [0x0000002d]: 0x00     [0x0000002e]: 0x6f     [0x0000002f]: 0x00     [0x00000030]: 0x75     [0x00000031]: 0x00     [0x00000032]: 0x70     [0x00000033]: 0x00     [0x00000034]: 0x00     [0x00000035]: 0x00     [0x00000036]: 0x2f     [0x00000037]: 0x00     [0x00000038]: 0x00     [0x00000039]: 0x00  hashed {byte[0x00000014]}     [0x00000000]: 0xbd     [0x00000001]: 0x0d     [0x00000002]: 0xea     [0x00000003]: 0x71     [0x00000004]: 0xbe     [0x00000005]: 0x0b     [0x00000006]: 0x25     [0x00000007]: 0x75     [0x00000008]: 0xe7     [0x00000009]: 0x5c     [0x0000000a]: 0x58     [0x0000000b]: 0x20     [0x0000000c]: 0x31     [0x0000000d]: 0x57     [0x0000000e]: 0xf3     [0x0000000f]: 0x9a     [0x00000010]: 0xef     [0x00000011]: 0x69     [0x00000012]: 0x1b     [0x00000013]: 0xfd
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1 Answer

  1. Something is very wrong here. SHA1 digests are 160 bits, which is 20 hexadecimal numbers, which is represented by 40 characters. The value you’re expecting is 32 characters, which means it’s not a SHA1 digest – or something else is missing that I don’t yet understand.

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