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ctrtool: Add support for inline decryption

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This commit is contained in:
Michael Scire
2017-05-19 08:34:50 -07:00
parent 7dcc166403
commit 4c63561224
17 changed files with 502 additions and 148 deletions
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ctrtool/exefs.c
+13 -21
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@@ -48,9 +48,10 @@ void exefs_set_encrypted(exefs_context* ctx, u32 encrypted)
ctx->encrypted = encrypted;
}
void exefs_set_key(exefs_context* ctx, u8 key[16])
void exefs_set_keys(exefs_context* ctx, u8 key[16], u8 special_key[16])
{
memcpy(ctx->key, key, 16);
memcpy(ctx->special_key, special_key, 16);
}
void exefs_set_counter(exefs_context* ctx, u8 counter[16])
@@ -58,22 +59,6 @@ void exefs_set_counter(exefs_context* ctx, u8 counter[16])
memcpy(ctx->counter, counter, 16);
}
void exefs_determine_key(exefs_context* ctx, u32 actions)
{
u8* key = settings_get_ncch_key(ctx->usersettings);
if (actions & PlainFlag)
ctx->encrypted = 0;
else
{
if (key)
{
ctx->encrypted = 1;
memcpy(ctx->key, key, 0x10);
}
}
}
void exefs_save(exefs_context* ctx, u32 index, u32 flags)
{
exefs_sectionheader* section = (exefs_sectionheader*)(ctx->header.section + index);
@@ -146,8 +131,14 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
goto clean;
}
if (ctx->encrypted)
if (ctx->encrypted) {
// .code and .firm use a special key on 7.0+
if (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES)
ctr_init_key(&ctx->aes, ctx->special_key);
ctr_crypt_counter(&ctx->aes, compressedbuffer, compressedbuffer, compressedsize);
if (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES)
ctr_init_key(&ctx->aes, ctx->key);
}
decompressedsize = lzss_get_decompressed_size(compressedbuffer, compressedsize);
@@ -228,8 +219,6 @@ void exefs_process(exefs_context* ctx, u32 actions)
{
u32 i;
exefs_determine_key(ctx, actions);
exefs_read_header(ctx, actions);
if (actions & VerifyFlag)
@@ -272,7 +261,10 @@ int exefs_verify(exefs_context* ctx, u32 index, u32 flags)
return 0;
fseeko64(ctx->file, ctx->offset + offset, SEEK_SET);
ctr_init_key(&ctx->aes, ctx->key);
if (index == 0 && (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES))
ctr_init_key(&ctx->aes, ctx->special_key);
else
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);