View source for NCA

The entire raw NCAs are encrypted.

The only known area which is not encrypted in the raw NCA is the logo section, when the NCA includes that section. Everything else documented on this page is for the plaintext version of that data.

=Header=
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x100
| RSA-2048 signature over the 0x200-bytes starting at offset 0x200.
|-
| 0x100
| 0x100
| Unknown. All-zero in some NCAs, non-zero for others. Presumably a RSA signature?
|-
| 0x200
| 0x4
| Magicnum "NCA3"
|-
| 0x208
| 0x8?
| Size of the entire NCA.
|-
| 0x210
| 0x8
| titleID
|-
| 0x230
| 0x8
| Big-endian titleID.
|-
| 0x240
| 0x10*0x4(0x40)
| Table for each section, see below.
|-
| 0x280
| 0x20*0x4(0x80)
| Table of SHA256 hashes, over each 0x200-byte Section Header Block.
|}

The header is 0x400-bytes, at NCA+0.

==Section Table Entry==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Media offset
|-
| 0x4
| 0x4
| Media end-offset
|-
| 0x8
| 0x4
| Unknown
|-
| 0xC
| 0x4
| Unknown
|}

Entry size is 0x10-bytes.

Media offset is absoluteoffset/{mediasize}, where mediasize is hard-coded to 0x200.

=Section Header Block=
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x1
| ?
|-
|-
| 0x1
| 0x1
| ?
|-
| 0x2
| 0x1
| ?
|-
| 0x3
| 0x1
| ?
|-
| 0x4
| 0x1
| Crypto type. 0 and >4 are invalid. 1 = none(plaintext from raw NCA). 2 = other crypto. 3 = regular crypto. 4 = unknown.
|-
| 0x5
| 0x1
| Padding?
|-
| 0x8
| 
| Start of the fs-specific header data.
|}

The Section Header Block for each section is at absoluteoffset+0x400+(sectionid*0x200), where sectionid corresponds to the index used with the entry/hash tables.

The total size is 0x200-bytes.

==Logo section==
This is a PFS0. See [[NCA_Content_FS|here]] for the mounted-FS logo contents.

==ExeFS section ==
This is a PFS0.

See [[ExeFS|here]] for mounted-FS ExeFS contents.

=PFS0=
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| X
| Table of hashes.
|-
| X
| Y
| Zeros for alignment to {alignment size}.
|-
| X+Y
| 
| Start of the PFS0 header.
|}

This is the FS which has magicnum "PFS0" at header+0.