Difference between revisions of "Talk:Boot.efi Information"

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(New page: So, has any effort been made to decypher the checksum? That seems to be the missing link to a lot of stuff (Patchstick, Linux, etc) being made freely available without concern of copyright...)
 
(RSA 1024bit signed?)
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So, has any effort been made to decypher the checksum? That seems to be the missing link to a lot of stuff (Patchstick, Linux, etc) being made freely available without concern of copyright issues. [[User:Timdorr|Timdorr]]
 
So, has any effort been made to decypher the checksum? That seems to be the missing link to a lot of stuff (Patchstick, Linux, etc) being made freely available without concern of copyright issues. [[User:Timdorr|Timdorr]]
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== RSA 1024bit signed? ==
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(sorry for my poor English)
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I found that each section have 32+256+256 bytes optional data, from 0x23fe8.
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boot.efi
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0x23de8-0x23e07 thumbnail of public key?
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0x23e08-0x23f07 public key, 1024 bit, little-endian => n
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0x23f08-0x24007 signature,  1024 bit, little-endian => a
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I calculated RSA b= a^65537 mod n, it generates
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b= (little endian)
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70 fa 16 88 f7 26 d4 3c cd fe 9d 86 99 d8 65 b6
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21 98 5b 0d 7a 3f b7 53 38 0b f9 31 91 56 21 bb
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20 04 00 05 01 02 04 03 65 01 48 86 60 09 06 0d
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30 31 30 00 ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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ff ff ff ff ff ff ff ff ff ff ff ff ff ff 01
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I think this is made from SHA-1 checksum of PE executables.

Revision as of 06:52, 30 April 2007

So, has any effort been made to decypher the checksum? That seems to be the missing link to a lot of stuff (Patchstick, Linux, etc) being made freely available without concern of copyright issues. Timdorr

RSA 1024bit signed?

(sorry for my poor English) I found that each section have 32+256+256 bytes optional data, from 0x23fe8. boot.efi 0x23de8-0x23e07 thumbnail of public key? 0x23e08-0x23f07 public key, 1024 bit, little-endian => n 0x23f08-0x24007 signature, 1024 bit, little-endian => a

I calculated RSA b= a^65537 mod n, it generates b= (little endian) 70 fa 16 88 f7 26 d4 3c cd fe 9d 86 99 d8 65 b6 21 98 5b 0d 7a 3f b7 53 38 0b f9 31 91 56 21 bb 20 04 00 05 01 02 04 03 65 01 48 86 60 09 06 0d 30 31 30 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 01

I think this is made from SHA-1 checksum of PE executables.