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Difference between revisions of "IM4P File Format"
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| − | The '''IM4P''' file format is a replacement of the [[IMG3 File Format]] used on older devices. It was introduced with [[iOS]] 7.0.1 and appears to be exclusive to the [[iPhone 5s]] and newer, [[iPad Air]] and [[iPad mini 2]]. |
+ | The '''IM4P''' file format is a replacement of the [[IMG3 File Format]] used on older devices. It was introduced with [[iOS]] 7.0.1 and appears to be exclusive to the [[iPhone 5s]] and newer, [[iPad Air]] and newer, [[iPad mini 2]] and newer as well as [[Apple Watch]]. |
The file is encoded as an DER encoded asn.1 object, structured like this: |
The file is encoded as an DER encoded asn.1 object, structured like this: |
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Revision as of 23:54, 23 April 2015
The IM4P file format is a replacement of the IMG3 File Format used on older devices. It was introduced with iOS 7.0.1 and appears to be exclusive to the iPhone 5s and newer, iPad Air and newer, iPad mini 2 and newer as well as Apple Watch.
The file is encoded as an DER encoded asn.1 object, structured like this:
sequence [
0: string "IM4P"
1: string type - ibot, rdsk, sepi, ...
2: string description - 'iBoot-1940.1.75'
3: octetstring - the encrypted data
4: octetstring - containing asn1 encoded KBAG values
sequence [
sequence [
0: int: 01
1: octetstring: iv
2: octetstring: key
]
sequence [
0: int: 02
1: octetstring: iv
2: octetstring: key
]
]
]
each .im4p file is accompanied with a .plist file containing the sha1 of the .im4p file.
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