Editing User talk:Masterzorag

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We got info0 + info1, 64bytes each
We got info0 + info1, 64bytes each
content is 2845bytes, total is data length 2973
content is 2845bytes, total is data lenght 2973
info0, info1 are not encrypted
info0, info1 are not encrypted
</pre>
</pre>
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=questions=
=questions=
'''z'''<br />
why you collect these hashes and signatures?<br />
why you collect these hashes and signatures?<br />
Now if 2 digests are different then R signatures would be diffenet too. Pseudo Random number (that used to creating signature) now is F(digest);<br />
Now if 2 digests are different then R signatures would be diffenet too. Pseudo Random number (that used to creating signature) now is F(digest);<br />
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<br />
<br />


'''m'''<br />
_Reply_<br />
ECDSA signature is the (r, s) keypair:<br />
ECDSA signature is the (r, s) keypair:<br />
http://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm#Signature_generation_algorithm
http://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm#Signature_generation_algorithm
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*those two needs investigation
*those two needs investigation
{|
1. For every digest, we have 1 and only 1 signature (R,S).<br />
| 1. "''For every digest, we have 1 and only 1 signature (R,S).''"<br />Sorry, but don't think so, because as you can have read, r comes from a random number.<br />2. "''Pseudo Random number (that used to creating signature) now is F(digest);''"<br />They can't be so idiots, since digest is ever known...<br /> || [[File:Signing with my keypair.png|100px|thumbnail]]
Sorry , but don't think so, because as you can have read, r comes from a random number. (I'll check)<br />
|}
2. Pseudo Random number (that used to creating signature) now is F(digest);<br />
*example of different signatures from custom keypair to test for dig: da39a3ee5e6b4b0d3255bfef95601890afd80709<br />
They can't be so idiots, since digest is ever known...<br />
pub: df4222f3bff899845d203cd9373358ff7a0752f501c7f378195c0ac7e157f61e14ff231d73a0137f<br />
_EndOfReply_<br /><br />
sig0: 008e8eaee8452d2915ef2186358079ee82a7c90d410063de8d98f012778596c14eb0df17f7464da65a02<br />
sig1: 00fdb20299e37c4a23a6cdc07ee0e91539e58ae62b00fc8ec36e79d2de33b4569f7968ea2211a4a92bef<br />
sig2: 0067af6858bf5bc2eb239dfcb997bc0c21fbaf16dc002f1c4cd4dcc5d71037d65caf05bbbccfce4f7fc1<br />


=playing on the vsh curve=
*So I will show for you that R = Function(digest) and what this fail is not so critical.
{| class="wikitable"
|-
|'''z'''<br />
So I will show for you that R = Function(digest) and what this fail is not so critical.
I was interested for edat algorithm and figured out how edats (and sdat) files are signed.<br />
I was interested for edat algorithm and figured out how edats (and sdat) files are signed.<br />
It contains 2 non-randomfailed ecdsa signatures. http://www.psdevwiki.com/ps3/EDAT_files#Structure_.28Encrypted_Format.29<br />
It contains 2 non-randomfailed ecdsa signatures. http://www.psdevwiki.com/ps3/EDAT_files#Structure_.28Encrypted_Format.29<br />
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So if digests are same then pseudo_random_numbers are same and signatures are same.<br />
So if digests are same then pseudo_random_numbers are same and signatures are same.<br />
Please make your conclusions.<br />
Please make your conclusions.<br />
|}
{| 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 length 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 />
{| class="wikitable"
|-
|'''z'''<br />
1. metadata length = 0 bytes for both files, so digest for empty message is DA39A3EE5E6B4B0D3255BFEF95601890AFD80709.<br />
2. r,s validated and valid of course. so you can use make_npdata the newest version for validate signatures into edats. there are no mistakes, it is realy ecdsa sig.<br />
3. Both signatures has 40 bytes, first 20 bytes is R , second 20 bytes is S.<br />
4. Sony used full 20 bytes length sha1 hash for validate ECDSA signatures.<br />
5. Correct info. SCE pkg file have only header signature. edat have metadata sig and header sig.<br />
|}
{| class="wikitable"
|-
|'''m'''<br />You are right, I've verified all, as you can see in my shots.<br />I've also noticed one thing that explain something: with zeroed ECDSA signature every digest results in a valid signature!<br />Why?<br />Because the signature becomes the point at infinity!<br />That's because on signature generation when r = 0 you have to select another random integer, as 0 < rand < n! And the same applies for s.<br />But really cool stuff can happen exacly with this kind of crazyness!||[[File:EDAT signatures on vsh curve 1.png|thumbnail|100px]] || [[File:EDAT signatures on vsh curve 2.png|thumbnail|100px]]
|}
<br />
{| class="wikitable"
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|'''z'''<br />Im verified metadata and header signatures for both edat files. Check my screenshotes please. || [[File:Hdd_package_key.edat_ECDSA_validation.jpg|thumbnail|100px]] || [[File:Destiny.edat_ECDSA_validation.jpg|thumbnail|100px]]
|}
{| class="wikitable"
|-
|'''m'''<br />
Checked your data, validated the same:
r =    00a2732e0161e20c290108fdd0b567120c42aab3d2
s =    00b894e8775aff90a3cbb6cc08bc918c14f759d439
hash =  da39a3ee5e6b4b0d3255bfef95601890afd80709 < zerolength metadata digest
call to check_ecdsa return 1, signature is VALID!
r =    00ff83adbd03d9ba619f3a6d80efef6408561f08d2
s =    009c3102a2852cdda21648014c4d0a1471bd6512fc
hash =  c9210133558bedda8981e5e06d6189be0dee84f3
call to check_ecdsa return 1, signature is VALID!
r =    0011f2e3ded044e3ace8e4513306a81ee124356e7a
s =    00ac9e20528900839f7a577c4b84e026539b89425e
hash =  6db5d204d7f9fa19442209a27647c3973a7e7232
call to check_ecdsa return 1, signature is VALID!
||
I can confirm your two signatures EDATs, when metadata length is zero the signature is valid as you told me and verified.<br />
could you try to validate a zeroed signature on two random hash with your implementation?<br />
f0f's one (and derived make_npdata) does not check for 1 < (r, s) < N - 1 as stated in signature verification algorithm, so a zeroed sig is valid for us!!<br />
|}
<br />
<br />
{| class="wikitable"
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|'''z'''<br />Im tryed to validate a zeroed signature on two random hashes. Check my screenshot please. My Conclusion. Signatures R would be same only when random numbers are same. -->> Random numbers are not random again! So you can find another examples with another same digests and same signatures(R,S) -->> Random number are depends of digest. If we find algorithm how the "Random" numbers depends of the digests , we can calculate the "Random" number itself and obtain the private key.|| [[File:Zeroed_signature_validation.jpg|thumbnail|100px]]
|}
*conclusion<br />
when you EDAT have your famous zero metadata length, 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.
* [https://www.youtube.com/watch?v=9UbTT_2yxeM sample psl1ght app: ec_gmp]
[https://github.com/andoma/ps3toolchain ps3toolchain and psl1ght from andoma], [https://gmplib.org gmplib] port, [https://github.com/masterzorag/xbm_tools xbm font] in [https://scognito.wordpress.com/2010/11/07/sconsole-a-simple-function-for-printing-strings-on-ps3 sconsole]: compute P = kG to eternity


=Petitboot NAND/NOR precompiled images=
_Reply_<br />
[[File:EDATs diff.png|thumbnail]]
You have already seen differences between two files, but maybe some other not. Here a png.<br />
First of all, that wiki page have a lot of "?", so something can be (really) different from what I've read.<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 !?!?!<br />
_EndOfReply_<br /><br />


* Not sure what is happening with you right now, but do you have some petitboot precompiled images? That'd be nice contribution for the wiki. Thanks :)
_Reply for reply_<br />
1. metadata length = 0 bytes for both files, so digest for empty message is DA39A3EE5E6B4B0D3255BFEF95601890AFD80709.
2. r,s validated and valid of course. so you can use make_npdata the newest version for validate signatures into edats. there are no mistakes, it is realy ecdsa sig.
3. Both signatures has 40 bytes, first 20 bytes is R , second 20 bytes is S.
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