ATECC SIGN instruction

This command asks the SpringCore device to perform an ECDSA signature , using its ATECC Secure Element.

This instruction is not available and will return an error if the device does not feature an ATECC Secure Element.

The private key must have been loaded earlier using the ATECC LOAD KEY instruction.

Field Value Remark
P1 EC ECDSA signature
P2 Key Index 00 to 0D
Lc 20 DataIn is the SHA256 of the message to be signed. Therefore, its length is forced to 32 bytes
DataIn Input hash SHA256 of the message to be signed
Le 00


Field Value Remark
DataOut Computed signature 70, 71 or 72 bytes
SW 9000 on success Other values are documented in Status Words