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Secure_Messaging_for_PINs CCA Release 2.54
Secure_Messaging_for_PINs (CSNBSPN)
Platform/
Product
OS/2 AIX Win NT/
2000
OS/400
IBM 4758-23 X
Use the Secure_Messaging_for_PINs verb to decrypt an input PIN-block, optionally
reformat the PIN-block, and incorporate the PIN-block into a text block you also
supply. The text block is then encrypted within the verb to preserve the security of
the PIN value. The encrypted text block, normally the “value” field in a TLV
3
item,
can be incorporated into a message sent to an EMV smart card.
The processing is consistent with the specifications provided in these documents:
EMV 2000 Integrated Circuit Card Specification for Payment Systems Version
4.0 (EMV4.0) Book 2
Design VISA Integrated Circuit Card Specification Manual.
You specify:
Whether the text block shall be CBC or ECB encrypted
Whether the PIN block shall be self-encrypted
The encrypted input_PIN_block
The key to decrypt the input_PIN_block
The PIN profile for the input_PIN_block
When the PIN profile specifies an ISO-0 PIN-block format, the PAN data to
recover the PIN
The key to encipher the “secure message” text block, the secmsg_key
The PIN profile for the PIN-block included within the output message
When the PIN profile specifies an ISO-0 PIN-block format, the PAN data to
obscure the PIN
The clear_text to be encrypted along with its length and the offset within the
text for placement of the PIN block. The text you supply must be a multiple of
eight bytes.
You also supply the encryption initialization_vector and the variable for
receiving the initialization vector for encrypting additional message text. The
verb design presumes that the supplied text is a portion of a larger message
you are preparing for an EMV smart card. The encrypted text must be on an
8-byte boundary within the complete message. The initialization_vector would
normally be the encrypted eight bytes just prior to the text prepared within this
verb.
The variable to receive the enciphered_text
The variable to receive a copy of the last eight bytes of enciphered text. This
can be used as an initialization vector for enciphering subsequent message
text.
3
TLV (Tag, Length, Value) is defined in ISO 7816-4
8-62 IBM 4758 CCA Basic Services, Release 2.54, February 2005