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__TOC__
{{Anchor|PSPXI}}{{Anchor|pxi:ps9}}
=Process Services PXI "pxi:ps9"=
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
!  Command Header
!  Command Header (Pre 2.0)
!  Command Header (Post 2.0)
!  Available since system version
!  Description
!  Description
|-
|-
| 0x000100C6
| 0x000100C6
| [[1.0.0-0]]
| This crypts a raw message with RSA.
|-
| 0x00020284
| 0x00020284
| 0x00020284
| [[1.0.0-0]]
| SignRsaSha256
| SignRsaSha256
|-
|-
| 0x00030284
| 0x00030284
| 0x00030284
| [[1.0.0-0]]
| VerifyRsaSha256
| VerifyRsaSha256
|-
|-
| 0x00040140
| Removed
| [[1.0.0-0]], removed with [[2.0.0-2]]
| SetAesKey
|-
| 0x000501C4
| 0x000401C4
| 0x000401C4
| EncryptDecryptAes
| [[1.0.0-0]]
| [[PSPXI:EncryptDecryptAes|EncryptDecryptAes]]
|-
|-
| 0x00060284
| 0x00050284
| 0x00050284
| EncryptSignDecryptVerifyAesCcm
| [[1.0.0-0]]
| [[PSPXI:EncryptSignDecryptVerifyAesCcm|EncryptSignDecryptVerifyAesCcm]]
|-
|-
| 0x00070000
| 0x00060000
| 0x00060000
| GetRomId
| [[1.0.0-0]]
| GetRomId. This reads 0x40-bytes from [[Gamecards|gamecard]] command 0xC6 (gamecard-uniqueID), and returns the first 0x10-bytes from that since the rest of the command reply is all 0xFF-bytes.
|-
|-
| 0x00080000
| 0x00070000
| 0x00070000
| GetRomId2
| [[1.0.0-0]]
| GetRomId2. The first u8 this returns is from GetRomMakerCode, the following 0x10-bytes are from [[AES|encrypting]] the 0x10-bytes which GetRomId also returns. This is encrypted with AES-CBC, the regular normal-key and IV set by [[FIRM|Process9]] for this are loaded from the Process9 .rodata section.
|-
|-
| 0x00090000
| 0x00080000
| 0x00080000
| GetCTRCardAutoStartupBit
| [[1.0.0-0]]
| [[PSPXI:GetCTRCardAutoStartupBit|GetCTRCardAutoStartupBit]]
|-
|-
| 0x000A0000
| 0x00090000
| 0x00090000
| [[1.0.0-0]]
| GetRomMakerCode
| GetRomMakerCode
|-
|-
| 0x000B0000
| 0x000A0000
| 0x000A0000
| GetLocalFriendCodeSeed
| [[1.0.0-0]]
| [[PSPXI:GetLocalFriendCodeSeed|GetLocalFriendCodeSeed]]
|-
|-
| 0x000C0000
| 0x000B0000
| 0x000B0000
| GetDeviceId
| [[1.0.0-0]]
| [[PSPXI:GetDeviceId|GetDeviceId]]
|-
|-
| 0x000D0042
| 0x000C0042
| 0x000C0042
| GatherEntropy
| [[1.0.0-0]]
| SeedRNG
|-
|-
| 0x000E0042
| 0x000D0042
| 0x000D0042
| GenerateRandomBytes
| [[1.0.0-0]]
| [[PSPXI:GenerateRandomBytes|GenerateRandomBytes]]
|-
| 0x04010084
| 0x04010084
| [[8.1.0-0_New3DS]]
| GenerateAmiiboHMAC. [[New_3DS]]-only. cmd[1] = insize, cmd[2] = outsize, cmd[3] = (insize<<8) <nowiki>|</nowiki> 0x4, cmd[4] = inbufptr, cmd[5] = (outsize<<8) <nowiki>|</nowiki> 0x14, and cmd[6] = outbufptr.
|-
| 0x04020082
| 0x04020082
| [[8.1.0-0_New3DS]]
| GenerateAmiiboKeyData. [[New_3DS]]-only. cmd[1] = insize, cmd[2] = u8 flag, cmd[3] = (insize<<8) <nowiki>|</nowiki> 0x4, cmd[4] = inbufptr.
|-
| 0x04030044
| 0x04030044
| [[8.1.0-0_New3DS]]
| AmiiboEncryptDecrypt. [[New_3DS]]-only.
|-
| 0x04040044
| 0x04040044
| [[8.1.0-0_New3DS]]
| AmiiboEncryptDecryptDev. [[New_3DS]]-only.
|}
 
These RSA commands are an interface for using the [[RSA]] engine. The system will hang when it attempts to use a >RSA-2048 RSA bit-size with the RSA engine, since the [[RSA]] engine does not support >RSA-2048. These RSA commands have an input field specifying what RSA bit-size to use, but the RSA padding code is hard-coded to use RSA-2048.
 
The New3DS 0x040X commands(used for [[Amiibo]] crypto) were removed with [[9.3.0-21]], the code for that was moved into [[NFC_Services|NFC]]-module.
 
=Command 0x04010084=
The input buffer size must be <=0x1E0-bytes, and the out buffer size must be >0 and <=0x20-bytes. This calculates a SHA256-HMAC over the input buffer using the current already-generated [[Amiibo]] HMAC key(generated_amiibodata+0x20), the output hash is then written to the out buffer.
 
=Command 0x04020082=
This is used for [[Amiibo]] key generation. 0x30-bytes are generated. The input buffer size must be 0x40-bytes.
 
The input u8 must be either zero or non-zero, the used value varies depending on what crypto(AES/HMAC) operation is done after the crypto init.
 
Structure of the input buffer:
{| class="wikitable" border="1"
|-
!  Offset
!  Size
!  Description
|-
| 0x0
| 0x2
| This is the raw [[Amiibo]]-write counter u16 from page[4] byte1.
|-
| 0x2
| 0xE
| All-zero.
|-
| 0x10
| 0x8
| This is the first 8-bytes of the NFC tag serial-number(page0-1).
|-
| 0x18
| 0x8
| Same 8-bytes as above.
|-
| 0x20
| 0x20
| This is the plaintext hash from NFC tag page[0x18], which is the hash listed under the page 0x15 section [[Amiibo|here]].
|}
 
=Command 0x04030044=
This is used for the actual [[Amiibo]] AES crypto, max input buffer size is same as command 0x04010084. AES-CTR is used here. Normal-key = generated_amiibodata+0x0, CTR = generated_amiibodata+0x10(see command 0x04010084 regarding generated_amiibodata).
 
=Command 0x04040044=
Similar to 0x04030044, except this is devunit-only with dev-only keys.
 
=RSA Context=
{| class="wikitable" border="1"
|-
!  Offset
!  Size
!  Description
|-
| 0x0
| 0x100
| Modulo
|-
| 0x100
| 0x100
| Exponent
|-
| 0x200
| 0x4
| RSA bit-size.
|-
| 0x204
| 0x1
| Exponent Type. 0 = Short Exponent, 1 = Long Exponent. See notes below.
|-
| 0x205
| 0x3
| Padding
|}
|}
This context structure is fixed to 0x208-bytes.
Notes on exponents:
* When the type is a short exponent, the exponent field is used as an u32 field with little endianness.
** An example use of this type is to load the common public exponent, 0x10001.
* When a long exponent is set, the exponent field is a buffer of a big endian number instead.
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