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Created page with "=Request= {| class="wikitable" border="1" |- ! Index Word ! Description |- | 0 | Header code [0x00470104] |- | 1 | Output buffer size |- | 2 | Input buffer size |- | 3 | Block ..."
=Request=
{| class="wikitable" border="1"
|-
! Index Word
! Description
|-
| 0
| Header code [0x00470104]
|-
| 1
| Output buffer size
|-
| 2
| Input buffer size
|-
| 3
| Block size
|-
| 4
| Nonce size, size 12 is used if this is >12.
|-
| 5
| (inputbufsize<<4) <nowiki>|</nowiki> 10
|-
| 6
| Input encrypted data buffer ptr
|-
| 7
| (outputbufsize<<4) <nowiki>|</nowiki> 12
|-
| 8
| Output cleartext data buffer ptr
|}
=Response=
{| class="wikitable" border="1"
|-
! Index Word
! Description
|-
| 0
| Header code
|-
| 1
| Result code
|}
=Description=
This decrypts the input data with [[PS:EncryptSignDecryptVerifyAesCcm|AES-CCM]] using keytype2. The 12-byte nonce buffer used by NS is cleared to all-zero, then the nonce from inputbuf+0 with the noncesize is copied to this nonce buffer. NS then uses [[PS:EncryptSignDecryptVerifyAesCcm]] with keytype2 and with the above nonce buffer, where the inputptr is inputbuf+noncesize, outputptr is outputbuf+0, and size is inputbuffersize - noncesize - 16.
After decryption, NS copies the data at outbuf+blocksize to outbuf+blocksize+noncesize, with size inputbuffersize-blocksize-16. NS then copies the nonce from inputbuf+0 with the noncesize, to outbuf+blocksize.
{| class="wikitable" border="1"
|-
! Index Word
! Description
|-
| 0
| Header code [0x00470104]
|-
| 1
| Output buffer size
|-
| 2
| Input buffer size
|-
| 3
| Block size
|-
| 4
| Nonce size, size 12 is used if this is >12.
|-
| 5
| (inputbufsize<<4) <nowiki>|</nowiki> 10
|-
| 6
| Input encrypted data buffer ptr
|-
| 7
| (outputbufsize<<4) <nowiki>|</nowiki> 12
|-
| 8
| Output cleartext data buffer ptr
|}
=Response=
{| class="wikitable" border="1"
|-
! Index Word
! Description
|-
| 0
| Header code
|-
| 1
| Result code
|}
=Description=
This decrypts the input data with [[PS:EncryptSignDecryptVerifyAesCcm|AES-CCM]] using keytype2. The 12-byte nonce buffer used by NS is cleared to all-zero, then the nonce from inputbuf+0 with the noncesize is copied to this nonce buffer. NS then uses [[PS:EncryptSignDecryptVerifyAesCcm]] with keytype2 and with the above nonce buffer, where the inputptr is inputbuf+noncesize, outputptr is outputbuf+0, and size is inputbuffersize - noncesize - 16.
After decryption, NS copies the data at outbuf+blocksize to outbuf+blocksize+noncesize, with size inputbuffersize-blocksize-16. NS then copies the nonce from inputbuf+0 with the noncesize, to outbuf+blocksize.