/ifsf-h2h-security

Compute security fields for IFSF H2H financial transaction messages

Primary LanguageJavaMIT LicenseMIT

IFSF Security Fields Processor

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Compute security fields for IFSF Host-to-Host Interface financial transaction messages under ANSI X9.24 version 2004 and ANSI X9.24 2009 encryption schemes.

IFSF Host-to-Host standard in an adaption of ISO 8583 mainly devised for fuel payment transactions, but also used in several other applications.

Using this library, the following fields can be easily calculated and parsed:

  • Personal Identification Number DE-52;
  • Encrypted sensitive data DE-127;
  • Message authentication code DE-64, DE-128.

To ease handling of field DE-52, utility methods to build and parse ISO 9564-1 Format 0 PIN blocks are also provided.

Formatting sensitive data in TLV format, hashing of the message for which ISO-9797-1 MAC has to be computed, and padding (using ether method 1 or method 2) are not in the scope of this library.

The library should only be used for testing purposes as it does not provide any sort of security.

Algorithm explanations and pseudo-code

Sources