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Difference between revisions of "IM4P File Format"
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| + | #REDIRECT [[IMG4 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 newer, [[iPad mini 2]] and newer,[[N102AP|iPod touch 6G]], [[J42dAP|Apple TV 4G]] as well as [[Apple Watch]]. |
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| − | The file is encoded as an DER encoded asn.1 object, structured like this: |
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| − | <pre> |
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| − | sequence [ |
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| − | 0: string "IM4P" |
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| − | 1: string type - ibot, rdsk, sepi, ... |
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| − | 2: string description - 'iBoot-1940.1.75' |
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| − | 3: octetstring - the encrypted data |
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| − | 4: octetstring - containing asn1 encoded KBAG values |
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| − | sequence [ |
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| − | sequence [ |
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| − | 0: int: 01 |
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| − | 1: octetstring: iv |
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| − | 2: octetstring: key |
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| − | ] |
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| − | sequence [ |
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| − | 0: int: 02 |
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| − | 1: octetstring: iv |
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| − | 2: octetstring: key |
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| − | ] |
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| − | ] |
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| − | ] |
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| − | </pre> |
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| − | each .im4p file is accompanied with a .plist file containing the sha1 of the .im4p file. |
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| − | == External Links == |
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| − | * [https://twitter.com/i0n1c/status/501299082603020288 i0n1c's tweet] |
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| − | {{stub}} |
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| − | [[Category:File Formats]] |
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Latest revision as of 00:28, 5 April 2016
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