Editing User talk:Masterzorag
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| Latest revision | Your text | ||
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We got info0 + info1, 64bytes each | We got info0 + info1, 64bytes each | ||
content is 2845bytes, total is data | content is 2845bytes, total is data lenght 2973 | ||
info0, info1 are not encrypted | info0, info1 are not encrypted | ||
</pre> | </pre> | ||
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{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
|'''m'''<br />You have already seen differences between two files, but maybe some other not. Here a png.<br />Page is telling me that at 0xB0 there is an ECDSA signature, and you are pointing out that we have the same (ECDSA) signature on two different files !?!<br />1. I see your "same signature", but how do you get "metadata digest = DA39A3EE5E6B4B0D3255BFEF95601890AFD80709" from both?<br />2. Conclusion to me are that at 0xB0 there is not an ECDSA signature, so: have you checked? Have you validated? Have you proven that r, s is the valid signature for the digest?<br />3. There is also another aspect to not forget: alignment (%16 = 0), so there is an ECDSA signature in 40 bytes? does not sound good to me...<br />4. SHA-1 produces a fixed | |'''m'''<br />You have already seen differences between two files, but maybe some other not. Here a png.<br />Page is telling me that at 0xB0 there is an ECDSA signature, and you are pointing out that we have the same (ECDSA) signature on two different files !?!<br />1. I see your "same signature", but how do you get "metadata digest = DA39A3EE5E6B4B0D3255BFEF95601890AFD80709" from both?<br />2. Conclusion to me are that at 0xB0 there is not an ECDSA signature, so: have you checked? Have you validated? Have you proven that r, s is the valid signature for the digest?<br />3. There is also another aspect to not forget: alignment (%16 = 0), so there is an ECDSA signature in 40 bytes? does not sound good to me...<br />4. SHA-1 produces a fixed lenght of 20 bytes: at wiki page I read "''0x40 QA digest, size 0x10 (seems like to be a SHA-1 hash of the non-finalized file) ... Can be ... zeroed on forged file.''" !?!<br />5. There are two ECDSA signatures on an EDAT file and only one to protect CORE_OS_PACKAGE.pkg from alteration !?!?! || [[File:EDATs diff.png|thumbnail|100px]] | ||
|} | |} | ||
<br /> | <br /> | ||
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r = 00a2732e0161e20c290108fdd0b567120c42aab3d2 | r = 00a2732e0161e20c290108fdd0b567120c42aab3d2 | ||
s = 00b894e8775aff90a3cbb6cc08bc918c14f759d439 | s = 00b894e8775aff90a3cbb6cc08bc918c14f759d439 | ||
hash = da39a3ee5e6b4b0d3255bfef95601890afd80709 < | hash = da39a3ee5e6b4b0d3255bfef95601890afd80709 < zerolenght metadata digest | ||
call to check_ecdsa return 1, signature is VALID! | call to check_ecdsa return 1, signature is VALID! | ||
r = 00ff83adbd03d9ba619f3a6d80efef6408561f08d2 | r = 00ff83adbd03d9ba619f3a6d80efef6408561f08d2 | ||
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*conclusion<br /> | *conclusion<br /> | ||
when you EDAT have your famous zero metadata | when you EDAT have your famous zero metadata lenght, so the same digest, they MUST use EVER the same signature, else they let us solve the math!<br /> | ||
that's the real reason that explain also your wrong think about "''there is only one signature''" for a digest. | that's the real reason that explain also your wrong think about "''there is only one signature''" for a digest. | ||