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Command: |
Verify a MAC on a binary message. |
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Note: |
If the Host is unable to support binary data transfers, the command can be used in standard 7-bit asynchronous mode, whereupon the message to be MACed is transferred in expanded hexadecimal notation. |
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Field |
Length & Type |
Details | |
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COMMAND MESSAGE |
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Message header |
m A |
(Subsequently returned to the Host unchanged). |
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Command code |
2 A |
Value MW. |
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Mode number |
1 N |
The MAC calculation mode number: 0 to 3. 0: The only block. 1: The first block. 2: A middle block. 3: The last block |
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Terminal authentication key |
16H or 1A+32H or 1A+48H |
TAK encrypted under LMK pair 16-17. |
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Initialization vector (IV) |
16 H |
Modes 2,3. IV returned from either mode 1 or 2 encrypted under variant 1 of LMK pair 16-17. |
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MAC |
8 H |
Modes 0,3. The MAC received with the unsolicited message. |
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EITHER |
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For Binary Communications Modes: |
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Message length |
3 H |
X’001 to X’320 indicating the length of the next field. |
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Message text |
n B |
1 to 800 bytes of message. |
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OR |
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For Standard Async Communications Mode: |
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Message length |
3 H |
X’002 to X’320 indicating the number of characters in the next field. |
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Message text |
n H |
2 to 800 hexadecimal characters representing 1 to 400 bytes of message. |
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End message delimiter |
1 C |
Optional. Must be present if a message trailer is present. Value X’19. |
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Message trailer |
n A |
Optional. Maximum length 32 characters. |
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Field |
Length & Type |
Details | |
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RESPONSE MESSAGE |
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Message header |
m A |
Returned to the Host unchanged. |
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Response code |
2 A |
Value MX. |
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Error code |
2 N |
00 : No errors. 01 : MAC verification failure. 10 : TAK parity error. 12 : No keys loaded in user storage. 13 : LMK error; report to supervisor. 15 : Error in input data. 21 : Invalid user storage index. 27 : TAK not single length. 80 : Message length error (including odd number of characters when using standard async mode). 90 : Communications link parity error. 91 : Communications link LRC error. 92 : Transparent async data length error. |
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IV |
16 H |
Present only in modes 1 and 2. The IV encrypted under variant 1 of LMK pair 16-17. |
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End message delimiter |
1 C |
Present only if present in the command message. Value X’19. |
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Message trailer |
n A |
Present only if present in the command message. Maximum length 32 characters. |
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