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https://github.com/d0k3/GodMode9.git
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49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
#include "agbsave.h"
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#include "sha.h"
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#include "aes.h"
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u32 GetAgbSaveSize(u32 nand_src) {
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AgbSave* agbsave = (AgbSave*) NAND_BUFFER;
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if (ReadNandSectors((u8*) agbsave, SECTOR_AGBSAVE, 1, 0x07, nand_src) != 0)
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return 0;
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return agbsave->save_size; // it's recommended to also check the CMAC
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}
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u32 CheckAgbSaveCmac(u32 nand_src) {
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u8 magic[] = { AGBSAVE_MAGIC };
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AgbSave* agbsave = (AgbSave*) NAND_BUFFER;
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if ((ReadNandSectors((u8*) agbsave, SECTOR_AGBSAVE, 1, 0x07, nand_src) != 0) ||
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(memcmp(agbsave->magic, magic, sizeof(magic)) != 0) ||
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(ReadNandBytes(agbsave->savegame, (SECTOR_AGBSAVE+1) * 0x200, agbsave->save_size, 0x07, nand_src) != 0))
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return 1;
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u8 cmac[16] __attribute__((aligned(32)));
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u8 shasum[32];
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sha_quick(shasum, ((u8*) agbsave) + 0x30, (0x200 - 0x30) + agbsave->save_size, SHA256_MODE);
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use_aeskey(0x24);
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aes_cmac(shasum, cmac, 2);
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return (memcmp(cmac, agbsave->cmac, 16) == 0) ? 0 : 1;
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}
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u32 FixAgbSaveCmac(u32 nand_dst) {
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AgbSave* agbsave = (AgbSave*) NAND_BUFFER;
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if ((ReadNandSectors((u8*) agbsave, SECTOR_AGBSAVE, 1, 0x07, nand_dst) != 0) ||
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(ReadNandBytes(agbsave->savegame, (SECTOR_AGBSAVE+1) * 0x200, agbsave->save_size, 0x07, nand_dst) != 0))
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return 1;
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u8 cmac[16] __attribute__((aligned(32)));
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u8 shasum[32];
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sha_quick(shasum, ((u8*) agbsave) + 0x30, (0x200 - 0x30) + agbsave->save_size, SHA256_MODE);
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use_aeskey(0x24);
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aes_cmac(shasum, cmac, 2);
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memcpy(agbsave->cmac, cmac, 16);
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// set CFG_BOOTENV = 0x7 so the save is taken over
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// https://www.3dbrew.org/wiki/CONFIG_Registers#CFG_BOOTENV
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*(u32*) 0x10010000 = 0x7;
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return (WriteNandSectors((u8*) agbsave, SECTOR_AGBSAVE, 1, 0x07, nand_dst) == 0) ? 0 : 1;
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}
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