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[ctrtool] Fixed decryption of exefs.

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This commit is contained in:
jakcron
2017-07-12 16:34:07 +10:00
parent e5b79babc8
commit b14842897c
1 changed files with 21 additions and 10 deletions
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ctrtool/exefs.c
+21 -10
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@@ -73,7 +73,7 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
u8* decompressedbuffer = 0; u8* decompressedbuffer = 0;
filepath* dirpath = 0; filepath* dirpath = 0;
// determine offset/size of target
offset = getle32(section->offset) + sizeof(exefs_header); offset = getle32(section->offset) + sizeof(exefs_header);
size = getle32(section->size); size = getle32(section->size);
dirpath = settings_get_exefs_dir_path(ctx->usersettings); dirpath = settings_get_exefs_dir_path(ctx->usersettings);
@@ -87,6 +87,7 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
return; return;
} }
// create new file
memset(name, 0, sizeof(name)); memset(name, 0, sizeof(name));
memcpy(name, section->name, 8); memcpy(name, section->name, 8);
@@ -108,11 +109,24 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
goto clean; goto clean;
} }
// seek in source file to location of target data
fseeko64(ctx->file, ctx->offset + offset, SEEK_SET); fseeko64(ctx->file, ctx->offset + offset, SEEK_SET);
ctr_init_key(&ctx->aes, ctx->key[0]);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);
// do decryption prep
if (ctx->encrypted)
{
// setup aes counter
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);
// setup key
if (strncmp((const char*)section->name, "icon", 8) == 0 || strncmp((const char*)section->name, "banner", 8) == 0)
ctr_init_key(&ctx->aes, ctx->key[0]);
else
ctr_init_key(&ctx->aes, ctx->key[1]);
}
// if this is file0, and compression is set or forced: decompress section
if (index == 0 && (ctx->compressedflag || (flags & DecompressCodeFlag)) && ((flags & RawFlag) == 0)) if (index == 0 && (ctx->compressedflag || (flags & DecompressCodeFlag)) && ((flags & RawFlag) == 0))
{ {
fprintf(stdout, "Decompressing section %s to %s...\n", name, outfname); fprintf(stdout, "Decompressing section %s to %s...\n", name, outfname);
@@ -131,12 +145,9 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
goto clean; goto clean;
} }
if (ctx->encrypted) { // decrypt if required
if (strncmp((const char*)section->name, "icon", 8) == 0 || strncmp((const char*)section->name, "banner", 8) == 0) if (ctx->encrypted)
ctr_init_key(&ctx->aes, ctx->key[0]); ctr_crypt_counter(&ctx->aes, compressedbuffer, compressedbuffer, compressedsize);
else
ctr_init_key(&ctx->aes, ctx->key[1]);
}
decompressedsize = lzss_get_decompressed_size(compressedbuffer, compressedsize); decompressedsize = lzss_get_decompressed_size(compressedbuffer, compressedsize);