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4,207 bytes added ,  19:49, 16 December 2016
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=Process Services PXI "pxi:ps9"=
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
 
!  Command Header
 
!  Command Header
 +
!  Available since system version
 
!  Description
 
!  Description
 
|-
 
|-
| 0x00180000
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| 0x000100C6
| GetCardType
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| [[1.0.0-0]]
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| This crypts a raw message with RSA.
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|-
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| 0x00020284
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| [[1.0.0-0]]
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| SignRsaSha256
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|-
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| 0x00030284
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| [[1.0.0-0]]
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| VerifyRsaSha256
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|-
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| 0x000401C4
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| [[1.0.0-0]]
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| [[PSPXI:EncryptDecryptAes|EncryptDecryptAes]]
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|-
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| 0x00050284
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| [[1.0.0-0]]
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| [[PSPXI:EncryptSignDecryptVerifyAesCcm|EncryptSignDecryptVerifyAesCcm]]
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|-
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| 0x00060000
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| [[1.0.0-0]]
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| 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.
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|-
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| 0x00070000
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| [[1.0.0-0]]
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| 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.
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|-
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| 0x00080000
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| [[1.0.0-0]]
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| [[PSPXI:GetCTRCardAutoStartupBit|GetCTRCardAutoStartupBit]]
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|-
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| 0x00090000
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| [[1.0.0-0]]
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| GetRomMakerCode
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|-
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| 0x000A0000
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| [[1.0.0-0]]
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| [[PSPXI:GetLocalFriendCodeSeed|GetLocalFriendCodeSeed]]
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|-
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| 0x000B0000
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| [[1.0.0-0]]
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| [[PSPXI:GetDeviceId|GetDeviceId]]
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|-
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| 0x000C0042
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| [[1.0.0-0]]
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| SeedRNG
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|-
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| 0x000D0042
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| [[1.0.0-0]]
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| [[PSPXI:GenerateRandomBytes|GenerateRandomBytes]]
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|-
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| 0x000E0042
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| [[1.0.0-0]], removed with [[2.0.0-2]]
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| With [[2.0.0-2]] the system no longer handles this command at all. This was mostly the same as GenerateRandomBytes.
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|-
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| 0x04010084
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| [[8.1.0-0_New3DS]]
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| [[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.
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|-
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| 0x04020082
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| [[8.1.0-0_New3DS]]
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| [[New_3DS]]-only. cmd[1] = insize, cmd[2] = u8 flag, cmd[3] = (insize<<8) <nowiki>|</nowiki> 0x4, cmd[4] = inbufptr.
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|-
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| 0x04030044
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| [[8.1.0-0_New3DS]]
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| [[New_3DS]]-only.
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|-
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| 0x04040044
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| [[8.1.0-0_New3DS]]
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| [[New_3DS]]-only.
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|}
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 +
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.
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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.
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=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.
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=Command 0x04020082=
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This is used for [[Amiibo]] key generation. 0x30-bytes are generated. The input buffer size must be 0x40-bytes.
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 +
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.
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 +
Structure of the input buffer:
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{| class="wikitable" border="1"
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|-
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!  Offset
 +
!  Size
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!  Description
 +
|-
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| 0x0
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| 0x2
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| This is the raw [[Amiibo]]-write counter u16 from page[4] byte1.
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|-
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| 0x2
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| 0xE
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| All-zero.
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|-
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| 0x10
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| 0x8
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| This is the first 8-bytes of the NFC tag serial-number(page0-1).
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|-
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| 0x18
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| 0x8
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| Same 8-bytes as above.
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|-
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| 0x20
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| 0x20
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| This is the plaintext hash from NFC tag page[0x18], which is the hash listed under the page 0x15 section [[Amiibo|here]].
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|}
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=Command 0x04030044=
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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).
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=Command 0x04040044=
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Similar to 0x04030044, except this is devunit-only with dev-only keys.
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=RSA Context=
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{| class="wikitable" border="1"
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|-
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!  Offset
 +
!  Size
 +
!  Description
 +
|-
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| 0x0
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| 0x100
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| Modulo
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|-
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| 0x100
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| 0x100
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| Exponent
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|-
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| 0x200
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| 0x4
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| RSA bit-size.
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|-
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| 0x204
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| 0x4
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| Normally zero?
 
|}
 
|}
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 +
This context structure is fixed to 0x208-bytes.