Process Services PXI
Process Services PXI "pxi:ps9"[edit]
| Command Header (Pre 2.0) | Command Header (Post 2.0) | Available since system version | Description |
|---|---|---|---|
| 0x000100C6 | 0x000100C6 | 1.0.0-0 | This crypts a raw message with RSA. |
| 0x00020284 | 0x00020284 | 1.0.0-0 | SignRsaSha256 |
| 0x00030284 | 0x00030284 | 1.0.0-0 | VerifyRsaSha256 |
| 0x00040140 | Removed | 1.0.0-0, removed with 2.0.0-2 | SetAesKey |
| 0x000501C4 | 0x000401C4 | 1.0.0-0 | EncryptDecryptAes |
| 0x00060284 | 0x00050284 | 1.0.0-0 | EncryptSignDecryptVerifyAesCcm |
| 0x00070000 | 0x00060000 | 1.0.0-0 | GetRomId. This reads 0x40-bytes from 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 | 1.0.0-0 | GetRomId2. The first u8 this returns is from GetRomMakerCode, the following 0x10-bytes are from encrypting the 0x10-bytes which GetRomId also returns. This is encrypted with AES-CBC, the regular normal-key and IV set by Process9 for this are loaded from the Process9 .rodata section. |
| 0x00090000 | 0x00080000 | 1.0.0-0 | GetCTRCardAutoStartupBit |
| 0x000A0000 | 0x00090000 | 1.0.0-0 | GetRomMakerCode |
| 0x000B0000 | 0x000A0000 | 1.0.0-0 | GetLocalFriendCodeSeed |
| 0x000C0000 | 0x000B0000 | 1.0.0-0 | GetDeviceId |
| 0x000D0042 | 0x000C0042 | 1.0.0-0 | SeedRNG |
| 0x000E0042 | 0x000D0042 | 1.0.0-0 | GenerateRandomBytes |
| 0x04010084 | 0x04010084 | 8.1.0-0_New3DS | GenerateAmiiboHMAC. New_3DS-only. cmd[1] = insize, cmd[2] = outsize, cmd[3] = (insize<<8) | 0x4, cmd[4] = inbufptr, cmd[5] = (outsize<<8) | 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) | 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-module.
Command 0x04010084[edit]
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[edit]
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:
| 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 here. |
Command 0x04030044[edit]
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[edit]
Similar to 0x04030044, except this is devunit-only with dev-only keys.
RSA Context[edit]
| 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.