pcr2.1 seed key algo

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Topic: pcr2.1 seed key algo (Read 3695 times)

proel

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	pcr2.1 seed key algo « on: March 26, 2020, 02:08:58 PM »

Hi,

is there an seed/key algo for this ecu.
i tried some calculations but without success

i have some correct seed/keys

seed: 84 A7 09 90
key : 84 A7 76 D3

seed: FB F6 A4 BE
key : FB F7 12 01

seed: AF 92 94 3D
key : AF 93 01 80

seed: 83 39 F4 1E
key: 83 3A 61 61


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gremlin

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	Re: pcr2.1 seed key algo « Reply #1 on: March 27, 2020, 09:15:25 AM »

mov eax, Seed
for (i = 1; i <= 3; i++)
{
ror eax, 1
jno L0
for (i = 1; i <= 6; i++)
{
sub eax, 0x06200617
jno L1
xor eax, 0x01200309
L1:
ror eax, 1
}
L0:
for (i = 1; i <= 4; i++)
{
add eax, 0x74191119
}
ror eax, 1
jno L2
xor eax, 0x25010720
L2:
rol eax, 1
jno L3
rol eax, 1
L3:
}
mov Key, eax
ret


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Geremia

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	Re: pcr2.1 seed key algo « Reply #2 on: March 29, 2020, 06:15:57 AM »

key = seed+0x6D43, nothing fancy


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sanyagans

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	Re: pcr2.1 seed key algo « Reply #3 on: October 25, 2022, 11:34:20 AM »

Quote from: Geremia on March 29, 2020, 06:15:57 AM

key = seed+0x6D43, nothing fancy


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