Host Protocols Direct Protocol ATCRYPTO class SIGN
April 13, 2023 at 2:39 AMSIGN instruction
Role
This instruction allows to compute a signature using one of the ECC private keys stored in the ATECC Secure Element. The SHA256 hash of the message shall be computed by the host.
Access condition
Depending on the configuration-defined access conditions and on the type of host interface (Local / Remote), this instruction may either be freely usable or restricted to authenticated communications.
Command
| Field | Value |
|---|---|
| CLA | 59 (ATCRYPTO) |
| INS | 46 |
| Data byte 0 | Key index (00 to 0D) |
| Data byte 1..32 | SHA256 hash of the message |
Response
| Field | Value |
|---|---|
| CLA | 59 (ATCRYPTO) |
| STA | 00 |
| Data bytes 0..N | Signature |