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changes.mady.by.user Alexandre Munsch

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changes.mady.by.user Alexandre Munsch

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Key

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Object

Length (bytes)

Comments

x

1

Length

1

PIN

4 to 16

Non-used digits set to random padding

Example

Below is an example of data received after a successful PIN entry:

Code Block
3cb9dd2f5021af506a74a0b14bf1d67479173e1302404d645fe2ddd382a26097be43c799a6d79bd759e3a
e0cabab835b31cb859ed8d900264522c2cef426de597becad0738c78578aa5538df3ad9f9f6a0c5c25e45
30d1754021c99faa037aabfe90cd1af8c3a68ebeabd9dce2df3cdf9208a55e7c94a13331b362fc3fedc57
e766c8aa8bc3ce750196857b832ff81027bd4168422a7b8ca1334a9df358038c48f9fb3d96c80f06d2899
87ffd313984cd540faa08e280911524fde4956091c8704455d7c652022a244955d6c60407b32a31c52f23
c93896f292f489e9c9349047997024ae33cf997bb5436bfdfb53eed28021354baab0fecd30bf3c58cacf0
d6a309d25919948c521e8d795d16b74a3fe4a114709e

Which can be split into:

  • The key ID:

Code Block
3cb9dd2f50

  • The encrypted KEK:

Code Block
21af506a74a0b14bf1d67479173e1302404d645fe2ddd382a26097be43c799a6d79bd759e3ae0cabab835
b31cb859ed8d900264522c2cef426de597becad0738c78578aa5538df3ad9f9f6a0c5c25e4530d1754021
c99faa037aabfe90cd1af8c3a68ebeabd9dce2df3cdf9208a55e7c94a13331b362fc3fedc57e766c8aa8b
c3ce750196857b832ff81027bd4168422a7b8ca1334a9df358038c48f9fb3d96c80f06d289987ffd31398
4cd540faa08e280911524fde4956091c8704455d7c652022a244955d6c60407b32a31c52f23c93896f292
f489e9c9349047997024ae33cf997bb5436bfdfb53eed28021354baab0fecd30bf3c58cacf0d6a309d259
19

  • The encrypted pseudo PIN-block:

Code Block
948c521e8d795d16b74a3fe4a114709e

Applying an RSA decryption (RSA/ECB/OAEPWithSHA-256AndMGF1Padding) on the “encrypted KEK” block will lead to:

  • The KEK:

Code Block
eaa5e9bbd66899cc561ee20ca9b3e775

  • The IV:

Code Block
00000000000000000000000000000000

Applying a AES decryption (AES/CBC/NoPadding) on the “encrypted pseudo PIN-block” will provide the following pseudo PIN block data:

Code Block
1415958944b2c2d77cb7fad1622bb213

Which can be split into:

  • The PIN:

Code Block
1595

  • The random padding:

Code Block
8944b2c2d77cb7fad1622bb213