ATECC508A datasheet(89/109 Pages) MICROCHIP

89 / 109 page

ECDSA Verify message is composed of KeyID and TempKey, formatted as below. Only KeyIDs 8 to

15 can be validated, so this command will return an error if KeyID is 0 – 7.

–

If the ECC verification passes, then the most significant four bits of the first byte of Block 0 of

the public key at KeyID will be set to 0x5. See Section Created ECC Keys.

–

Key validation takes place regardless of the state of the LockValue byte and/or the

SlotLocked bit corresponding to this slot.

–

If the X509format<KeyConfig.X509id> is zero, then the Verify command will return an error.

–

Data1 and Data2 sizes must be 32 bytes each. Data3 and Data4 should both be zero length.

Table 9-54. Input Parameters

Name

Size

Notes

Opcode

Verify

0x45

Param1

Mode

Bits 7-3:

Must be zero.

Bits 2-0:

000 = Stored Mode.

001 = ValidateExternal Mode.

010 = External Mode.

011 = Validate Mode.

111 = Invalidate Mode.

100-110 = Do not use

Param2

KeyID

If Mode<2:0> is Stored Mode, KeyID contains the number of the slot containing the

public key to be used for the verification. KeyConfig.KeyType determines the curve to

be used.

If Mode<2:0> is ValidateExternal Mode, KeyID contains the number of the slot

containing the public key to be validated which must have been specified by a

previous SHA(Public) command. The parent key to be used to perform the validation

is stored in SlotConfig.ReadKey and KeyConfig<ParentKey>.KeyType determines

the curve to be used.

If Mode<2:0> is External Mode, KeyID contains the curve type to be used to Verify

the signature. The value in this field is encoded identically to the KeyType field in the

KeyConfig words within the Configuration zone.

If Mode<2:0> is Validate or Invalidate mode, KeyID contains the number of the slot

containing the public key to be (in)validated. The parent key to be used to perform

the (in)validation is stored in SlotConfig.ReadKey. SlotConfig<ParentKey>.KeyType

determines the curve to be used.

Data1

The R component of the ECDSA signature to be verified.

Data2

The S component of the ECDSA signature to be verified.

Data3

0 or 32 The X component of the public key to be used for verification if Mode<2:0> is

External.

Data4

0 or 32 The Y component of the public key to be used for verification if Mode<2:0> is

External.

Data5

OtherData 0 or 19 If Validate mode, the bytes used to generate the message for the validation. X and Y

should be zero length in this mode and this parameter comes immediately after S in

the input parameter stream. Should be zero length for all other modes.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 89

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