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ACF, certainly standing for Activation Code File, is a data structure present in the [[Serial Flash]] [[Non Volatile Storage]] of a PS4 Dev/Test Kit or prototype when it is activated.
ACF, certainly standing for Activation Code/Control/Console File/Flag, is a data structure present in the [[Serial Flash]] [[Non Volatile Storage]] of a PS4 Dev/Test Kit or prototype when it is activated.


On PS Vita, compared to PS4, it is named "act" instead of "acf" and is stored in Syscon NVS instead of Serial Flash NVS. On PS5, Kit activation requires a [https://www.psdevwiki.com/ps5/CP_Box Communication Processor Box] and so may be contained in the [https://www.psdevwiki.com/ps5/CP_Box_Non_Volatile_Storage PS5 CP Box NVS].
On PS Vita, compared to PS4, it is named "act" instead of "acf" and is stored in Syscon NVS instead of Serial Flash NVS. On PS5, Kit activation requires a [https://www.psdevwiki.com/ps5/CP_Box Communication Processor Box] and so may be contained in the [https://www.psdevwiki.com/ps5/CP_Box_Non_Volatile_Storage PS5 CP Box NVS].
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See also [https://wiki.henkaku.xyz/vita/AFV PS Vita Activation AFV especially its token] and [https://wiki.henkaku.xyz/vita/Ernie#NVS PS Vita Syscon NVS Activation Data].
See also [https://wiki.henkaku.xyz/vita/AFV PS Vita Activation AFV especially its token] and [https://wiki.henkaku.xyz/vita/Ernie#NVS PS Vita Syscon NVS Activation Data].


The PS4 ACF is completed by a RSA-2048 signature stored as well in the [[Serial Flash]] [[NVS]].
The PS4 ACF is completed by a RSA signature stored in a different area of the Serial Flash NVS.
 
The PS4 ACF is checked in the sceSblDevActVerifyCheckExpire kernel function.


= Structure =
= Structure =


Total length is 0x68 bytes. It may also be 0x6C bytes for some PS4 consoles, according to zecoxao.
Total length is 0x68 bytes. It may also be 0x6C bytes for some PS4 consoles, according to zecoxao. It is written to a 0x80-byte area in [[Serial Flash]] [[Non Volatile Storage]].
 
It is written to a 0x80-byte area in [[Serial Flash]] [[Non Volatile Storage]] bank 0 block 4 offset 0x80.


{| class="wikitable"
{| class="wikitable"
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| 0 || 4 || '''Magic'''. Always "acf\0" on PS4, "act\0" on PS Vita.
| 0 || 4 || '''Magic'''. Always "acf\0" on PS4, "act\0" on PS Vita.
|-
|-
| 4 || 1 || '''Format Version'''. Always 1 on PS4 and PS Vita.
| 4 || 4 || '''Format Version'''. Contains format_major_ver and format_minor_ver. Always 01 02 00 00 on PS4, 01 00 00 00 on PS Vita.
|-
| 5 || 1 || '''Format Minor Version'''. Always 2 on PS4, 0 on PS Vita.
|-
| 6 || 2 || '''Reserved'''. Padding. Always zeroed on PS4 and PS Vita.
|-
|-
| 8 || 0x10 || '''Activation Key'''. Likely derived from OpenPsId.
| 8 || 0x10 || '''Activation Key'''. Likely derived from OpenPsId.
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| 0x1C || 4 || '''Start Date'''. Little Endian.
| 0x1C || 4 || '''Start Date'''. Little Endian.
|-
|-
| 0x20 || 4 || '''End Date'''. Little Endian. Usually 90 days after Start Date.
| 0x20 || 4 || '''Expire Date'''. Little Endian. Usually 90 days since Start Date.
|-
|-
| 0x24 || 4 || '''Reserved'''. Always zeroed.
| 0x24 || 4 || '''Reserved'''. Always zeroed.
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|}
|}


<syntaxhighlight lang="C">
<source lang="C">
  typedef struct SceAcf {
  typedef struct SceAcf {
     char magic[4];
     char magic[4];
     uint8_t format_ver;
     uint32_t format_ver;
    uint8_t format_minor_ver;
    uint16_t reserved;
     char activation_key[16];
     char activation_key[16];
     uint32_t issue_no;  
     uint32_t issue_no;  
     uint32_t start_date;
     uint32_t start_date;
     uint32_t end_date;
     uint32_t expire_date;
     uint32_t reserved;
     uint32_t reserved;
     char key_hash[64];
     char key_hash[64];
  } SceAcf;
  } SceAcf;
</syntaxhighlight>
</source>
 
= RSA-2048 Signature =
 
A RSA-2048 signature of the ACF is present in [[Serial Flash]] [[NVS]] bank 0 block 4 offset 0x900.
 
On PS Vita, the RSA-2048 signature is only present since System Software version 2.10 and is stored in the eMMC in the tm0:act/actsig.dat file instead of the NVS.


= Example =
= Example =
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