Verify a MAC on a Public Key

Command:

Verify a MAC on a public key, using LMK pair 36-37.

Notes:

This command requires the optional RSA licence, error code 67 will be returned if the command is not licenced.

See: Using the RSA cryptosystem for details of where valid values of the common parameters can be found.

Field

Length & Type

Details

COMMAND MESSAGE

Message header

m A

(Subsequently returned to the Host unchanged).

Command code

2 A

Value EQ.

MAC

4 B

MAC on the public key and authentication data, calculated using LMK pair 36-37.

Public key

n B

Public key, DER encoded in ASN.1 format (sequence of modulus, exponent).

Authentication data

n B

Optional. Additional data to be included in the MAC calculation (must not include “;”).

End message delimiter

1 C

Optional.  Must be present if a message trailer is present. Value X’19.

Message trailer

n A

Optional.  Maximum length 32 characters.

RESPONSE MESSAGE

Message header

m A

Returned to the Host unchanged.

Response code

2 A

Value ER.

Error code

2 N

00 : No error

01 : MAC verification failure

04 : Public key does not conform to encoding rules

13 : LMK error; report to supervisor

15 : Error in input data

End message delimiter

1 C

Present only if present in the command message. Value X’19.