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[ctrtool] Improved efficiency of aes-ctr operations.

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This commit is contained in:
jakcron
2016-06-14 20:35:05 +08:00
parent de5c4e1b2a
commit 01cd4cba7b
8 changed files with 96 additions and 44 deletions
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ctrtool/romfs.c
+6 -2
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@@ -38,6 +38,7 @@ void romfs_set_encrypted(romfs_context* ctx, u32 encrypted)
void romfs_set_key(romfs_context* ctx, u8 key[16])
{
memcpy(ctx->key, key, 16);
ctr_init_key(&ctx->aes, key);
}
void romfs_set_counter(romfs_context* ctx, u8 counter[16])
@@ -49,8 +50,11 @@ void romfs_fseek(romfs_context* ctx, u64 offset)
{
u64 data_pos = offset - ctx->offset;
fseeko64(ctx->file, offset, SEEK_SET);
ctr_init_counter(&ctx->aes, ctx->key, ctx->counter);
ctr_add_counter(&ctx->aes, (u32) (data_pos / 0x10));
if (ctx->encrypted) {
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, (u32)(data_pos / 0x10));
}
}
size_t romfs_fread(romfs_context* ctx, void* buffer, size_t size, size_t count)