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Difference between revisions of "8900 File Format"
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| − | This is the file format used by the [[S5L8900]] |
+ | This is the file format used by the [[S5L8900]]. Usually this wraps around an [[IMG2 File Format|IMG2]] file. |
==Header== |
==Header== |
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Revision as of 23:28, 27 July 2008
This is the file format used by the S5L8900. Usually this wraps around an IMG2 file.
Header
typedef struct {
uchar magic[4]; // string "8900"
uchar version[3]; // string "1.0"
uint8 format; // plaintext format is 0x4, encrypted with GID-key format is 0x3, boot plaintext is 0x2, boot encrypted with UID-key is 0x1.
uint32 unknown1;
uint32 sizeOfData; // size of data (ie, filesize - header(0x800) - footer signature(0x80) - footer certificate(0xC0A))
uint32 footerSignatureOffset; // offset to footer signature
uint32 footerCertOffset; // offset to footer certificate, from end of header (0x800)
uint32 footerCertLen;
uchar salt[0x20]; // a seemingly random salt (an awfully big one though... needs more attention)
uint16 unknown2;
uint16 epoch; // the security epoch of the file
uchar headerSignature[0x10]; // encrypt(sha1(header[0:0x40])[0:0x10], key_0x837, zero_iv)
uchar padding[0x7B0];
} Apple8900Header;
