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/*
* Simple library to detect and validate SSN and Credit Card numbers.
*
* Copyright (C) 2007-2008 Sourcefire, Inc.
*
* Authors: Martin Roesch <roesch@sourcefire.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#ifndef __DLP_H_
#define __DLP_H_
#include <stdio.h>
/* these macros define the SSN string format to search for */
#define SSN_FORMAT_HYPHENS 0 /* xxx-yy-zzzz */
#define SSN_FORMAT_STRIPPED 1 /* xxxyyzzzz */
/*
* will check if a valid credit card number exists within the
* first 16 bytes of the supplied buffer. Validation supplied
* via the Luhn algorithm.
* Params:
* buffer => data buffer to be validated.
* length => length of supplied buffer. Values greater than 16 are
* truncated to 16. Values less than 13 are rejected.
* Returns:
* 1 on a find, 0 on a miss
*/
int dlp_is_valid_cc(const unsigned char *buffer, int length);
/* Searches the supplied buffer for credit card numbers and returns
* the number of CC's found.
* Params:
* buffer => data buffer to be analyzed.
* length => length of buffer.
* Returns:
* Count of detected CC #'s.
*/
int dlp_get_cc_count(const unsigned char *buffer, int length);
/* Searches the supplied buffer for CC #'s. Bails out as soon as a
* validated number is detected.
* Params:
* buffer => data buffer to be analyzed.
* length => length of buffer.
* Returns:
* 1 on detect, 0 on fail
*/
int dlp_has_cc(const unsigned char *buffer, int length);
/* Checks the supplied buffer for a valid SSN number. Validation
* is supplied via area and group number validation. Valid numbers
* which are not in circulation (666 series, 000 series) are NOT
* detected, only numbers that can be valid in the real world. Searches
* only the first 11 or 9 bytes (based on the selected format)!
* Params:
* buffer => buffer to be validated
* length => length of buffer to validate
* Returns:
* 1 on detect, 0 on failure
*/
int dlp_is_valid_ssn(const unsigned char *buffer, int length, int format);
/* Searches the supplied buffer for valid SSNs. Note that this function
* is effectively searching the buffer TWICE looking for the hyphenated and
* stripped forms of the SSN. There will be a performance impact!
* Params:
* buffer => buffer to search
* length => length of the buffer
* Returns:
* Count of SSNs in the supplied buffer
*/
int dlp_get_ssn_count(const unsigned char *buffer, int length);
/* Searches the supplied buffer for valid SSNs formatted as xxxyyzzzz.
* Params:
* buffer => buffer to search
* length => length of the buffer
* Returns:
* Count of SSNs in the supplied buffer.
*/
int dlp_get_stripped_ssn_count(const unsigned char *buffer, int length);
/* Searches the supplied buffer for valid SSNs formatted as xxx-yy-zzzz.
* Params:
* buffer => buffer to search
* length => length of the buffer
* Returns:
* Count of SSNs in the supplied buffer.
*/
int dlp_get_normal_ssn_count(const unsigned char *buffer, int length);
/* Searches the supplied buffer for a SSN in any format. This searches the
* buffer twice for both the stripped and hyphenated versions of an SSN so
* there will be a performance impact!
* Params:
* buffer => buffer to search
* length => length of the buffer
* Returns:
* 1 on detect, 0 on fail
*/
int dlp_has_ssn(const unsigned char *buffer, int length);
/* Searches the supplied buffer for a SSN in the stripped xxxyyzzzz format.
* Params:
* buffer => buffer to search
* length => length of the buffer
* Returns:
* 1 on detect, 0 on fail
*/
int dlp_has_stripped_ssn(const unsigned char *buffer, int length);
/* Searches the supplied buffer for a SSN in the normal xxx-yy-zzzz format.
* Params:
* buffer => buffer to search
* length => length of the buffer
* Returns:
* 1 on detect, 0 on fail
*/
int dlp_has_normal_ssn(const unsigned char *buffer, int length);
#endif /* __DLP_H_ */
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