Talk:PRX File Format
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From UOFW loadelf.h :
typedef struct {
/* PSP Header magic */
u8 magic[4]; //0
/* The module's attributes. One or more of ::SceModulePrivilegeLevel. */
u16 modAttribute; //4
/* The Compression attributes of the module. One of ::SceExecFileAttr. */
u16 compAttribute; //6
/* The minor module version. */
u8 moduleVerLo; //8
/* The major module version. */
u8 moduleVerHi; //9
/* The module's name. */
s8 modName[SCE_MODULE_NAME_LEN + 1]; //10
/* Module version. */
u8 modVersion; //38
/* The number of segment the module consists of. */
u8 nSegments; //39
/* The size of the uncompressed and decrypted module. */
u32 elfSize; //40
/* The size of the compressed/encrypted module. */
u32 pspSize; //44
/* The entry address of the module. It is the offset from the start of the TEXT segment to the program's entry point. */
u32 bootEntry; //48
/* The offset from the start address of the TEXT segment to the SceModuleInfo section. */
u32 modInfoOffset; //52
/* The size of the BSS segment. */
u32 bssSize; //56
/* An array containing the alignment information of each segment. */
u16 segAlign[SCE_KERNEL_MAX_MODULE_SEGMENT]; //60
/* An array containing the start address of each segment. */
u32 segAddress[SCE_KERNEL_MAX_MODULE_SEGMENT]; //68
/* An array containing the size of each segment. */
u32 segSize[SCE_KERNEL_MAX_MODULE_SEGMENT]; //84
/* Reserved. */
u32 reserved[5]; //100
/* The development kit version the module was compiled with. */
u32 devkitVersion; //120
/* The decryption mode. One of ::SceExecFileDecryptMode. */
u8 decryptMode; //124
/* Reserved. */
u8 padding; //125
/* The overlap size. */
u16 overlapSize; //126
/* The AES key data. */
u8 aesKey[AES_KEY_SIZE]; //128
/* THE CMAC key data. */
u8 cmacKey[CMAC_KEY_SIZE]; //144
/* The CMAC header hash. */
u8 cmacHeaderHash[CMAC_HEADER_HASH_SIZE]; //160
/* The size of the compressed ELF. */
u32 compSize; //176
/* Unknown. */
u32 unk180; //180
/* Unknown. */
u32 unk184; //184
/* Unknown. */
u32 unk188; //188
/* The CMAC Data hash. */
u8 cmacDataHash[CMAC_DATA_HASH_SIZE]; //192
/* Tag value. */
u32 tag; //208
/* Check. */
u8 sCheck[CHECK_SIZE]; //212
/* The SHA-1 hash. */
u8 sha1Hash[SHA1_HASH_SIZE]; //300
/* Key data. */
u8 keyData4[KEY_DATA_SIZE]; //320
} PspHeader; //size == 336
source (thanks artart78) :