SepaCntryValidationBase::validateCI() - Code Metrics - Stefanius67/Sepa - Measure and Improve Code Quality continuously with Scrutinizer

SepaCntryValidationBase::validateCI() A
last analyzed 2025-08-15 00:26 UTC

↳ Parent: SepaCntryValidationBase

Complexity

Conditions	6
Paths	7

Size

Total Lines	24
Code Lines	14

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	14
dl	0
loc	24
rs	9.2222
c	0
b	0
f	0
cc	6
nc	7
nop	1

<?php
namespace SKien\Sepa\CntryValidation;

use SKien\Sepa\Sepa;

/**
 * Base class for country specific validation for IBAN, BIC and CI.
 *
 * Needed methods to calculate checksum and check the format of
 * the values.
 * Format check is made with regular expressions that can be set to
 * the country specific rules.
 *
 * Create for each country to support a class extending this class.
 * For most of the participating countries, it is sufficient to
 * specify in the constructor the respective length, the formatting
 * rule (RegEx) and the information whether alphanumeric characters
 * are allowed.
 *
 * If more complicated rules apply in a country, the respective
 * method for validation can be redefined in the extended class in
 * order to map this rule.
 * @see SepaCntryValidationBE class
 *
 * @package Sepa
 * @author Stefanius <[email protected]>
 * @copyright MIT License - see the LICENSE file for details
 */
class SepaCntryValidationBase implements SepaCntryValidation
{
    /** @var string 2 digit ISO country code (ISO 3166-1)   */
    protected string $strCntry = '';
    /** @var int    length of the IBAN     */
    protected int $iLenIBAN = -1;
    /** @var string regular expression to validate the format of the IBAN    */
    protected string $strRegExIBAN = '';
    /** @var bool   if true, alphanum values in the IBAN allowed    */
    protected bool $bAlphaNumIBAN = false;
    /** @var int    length of the IC     */
    protected int $iLenCI = -1;
    /** @var string regular expression to validate the format of the CI    */
    protected string $strRegExCI = '';
    /** @var bool   if true, alphanum values in the CI allowed    */
    protected bool $bAlphaNumCI = false;
    /** @var string last calculated checksum    */
    protected string $strLastCheckSum = '';

    /**
     * Create instance of validation.
     * This constructor checks, if the country code from the parameter equals to the
     * code defined in the extension class. This prevents the wrong class from being used
     * for validation for a given country.
     * @param string $strCntry  2 sign country code
     */
    public function __construct(string $strCntry)
    {
        if (strtoupper($strCntry) != $this->strCntry) {
            trigger_error('instanciation with invalid country ' . $strCntry . ' (expected ' . $this->strCntry . ')', E_USER_ERROR);
        }
    }

    /**
     * Validates given IBAN.
     *
     * @link https://www.ecbs.org/iban.htm
     * @link http://www.pruefziffernberechnung.de/I/IBAN.shtml
     *
     * @param string $strIBAN   IBAN to validate
     * @return int Sepa::OK or errorcode <ul>
     * <li><b> Sepa::ERR_IBAN_INVALID_CNTRY   </b>  invalid country code </li>
     * <li><b> Sepa::ERR_IBAN_INVALID_LENGTH  </b>  invalid length </li>
     * <li><b> Sepa::ERR_IBAN_INVALID_SIGN    </b>  IBAN contains invalid sign(s) </li>
     * <li><b> Sepa::ERR_IBAN_CHECKSUM        </b>  wrong checksum </li></ul>
     */
    public function validateIBAN(string $strIBAN) : int
    {
        // toupper, trim and remove containing blanks
        $strIBAN = str_replace(' ', '', trim(strtoupper($strIBAN)));
        if (strlen($strIBAN) != $this->iLenIBAN) {
            return Sepa::ERR_IBAN_INVALID_LENGTH;
        }
        if (substr($strIBAN, 0, 2) != $this->strCntry) {
            return Sepa::ERR_IBAN_INVALID_CNTRY;
        }
        if (!preg_match($this->strRegExIBAN, $strIBAN)) {
            return Sepa::ERR_IBAN_INVALID_SIGN;
        }

        $strCS = substr($strIBAN, 2, 2);
        $strBBAN = substr($strIBAN, 4);

        // alphanumeric account number allowed (except the country code...)?
        if ($this->bAlphaNumIBAN) {
            $strBBAN = $this->replaceAlpha($strBBAN);
        }
        if ($this->getCheckSum($strBBAN) != $strCS) {
            return Sepa::ERR_IBAN_CHECKSUM;
        }
        return Sepa::OK;
    }

    /**
     * Validates given BIC.
     * Follows <b> ISO 9362 </b><br>
     * as far as I have determined, the format of the BIC is uniform within
     * the participating countries for SEPA.
     * @param string $strBIC    BIC to validate
     * @return int Sepa::OK or errorcode<ul>
     * <li><b> Sepa::ERR_BIC_INVALID        </b>  invalid BIC </li>
     * <li><b> Sepa::ERR_BIC_INVALID_CNTRY  </b>  invalid country code </li></ul>
     */
    public function validateBIC(string $strBIC) : int
    {
        if (substr($strBIC, 4, 2) != $this->strCntry) {
            return Sepa::ERR_BIC_INVALID_CNTRY;
        }
        $iErr = Sepa::ERR_BIC_INVALID;
        if (preg_match('/^([A-Z]){4}([A-Z]){2}([0-9A-Z]){2}([0-9A-Z]{3})?$/', $strBIC)) {
            $iErr = Sepa::OK;
        }
        return $iErr;
    }

    /**
     * Validates given CI (Creditor Scheme Identification).
     *
     * The general structure for the CI is the following:
     * - Position 1-2 filled with the ISO country code
     * - Position 3-4 filled with the check digit according to ISO 7064 Mod 97-10
     * - Position 5-7 filled with the Creditor Business Code, if not used then filled with ZZZ
     * - Position 8 onwards filled with the country specific part of the identifier being
     *   a national identifier of the Creditor as defined by the concerned national community.
     *
     * NOTE: the CBC is not taken into account when calculating the checksum!
     *
     * @link https://www.sepaforcorporates.com/sepa-direct-debits/sepa-creditor-identifier/
     * @link https://www.europeanpaymentscouncil.eu/sites/default/files/kb/file/2019-09/EPC262-08%20v7.0%20Creditor%20Identifier%20Overview_0.pdf
     * @link https://www.europeanpaymentscouncil.eu/sites/default/files/KB/files/EPC114-06%20SDD%20Core%20Interbank%20IG%20V9.0%20Approved.pdf#page=10
     *
     * online CI Validator
     * @link http://www.maric.info/fin/SEPA/ddchkden.htm
     *
     * @param string $strCI     CI to validate
     * @return int Sepa::OK or errorcode<ul>
     * <li><b> Sepa::ERR_CI_INVALID_CNTRY   </b>  invalid country code </li>
     * <li><b> Sepa::ERR_CI_INVALID_LENGTH  </b>  invalid length </li>
     * <li><b> Sepa::ERR_CI_INVALID_SIGN    </b>  CI contains invalid sign(s) </li>
     * <li><b> Sepa::ERR_CI_CHECKSUM        </b>  wrong checksum </li></ul>
     */
    public function validateCI(string $strCI) : int
    {
        // toupper, trim and remove containing blanks
        $strCheck = str_replace(' ', '', trim(strtoupper($strCI)));
        if (strlen($strCheck) != $this->iLenCI) {
            return Sepa::ERR_CI_INVALID_LENGTH;
        }
        if (substr($strCheck, 0, 2) != $this->strCntry) {
            return Sepa::ERR_CI_INVALID_CNTRY;
        }
        if (!preg_match($this->strRegExCI, $strCheck)) {
            return Sepa::ERR_CI_INVALID_SIGN;
        }

        $strCS = substr($strCheck, 2, 2);
        // NOTE: the CBC is not taken into account when calculating the checksum!
        $strCheck = substr($strCheck, 7);
        if ($this->bAlphaNumCI) {
            $strCheck = $this->replaceAlpha($strCheck);
        }
        if ($this->getCheckSum($strCheck) != $strCS) {
            return Sepa::ERR_CI_CHECKSUM;
        }
        return Sepa::OK;
    }

    /**
     * Return last calculated checksum.
     * This method is only for test purposes.
     * @return string
     * @internal
     */
    public function getLastCheckSum() : string
    {
        // @codeCoverageIgnoreStart
        /*
         * Outside of coverge, since this method only can be used to retrieve
         * any calculated checksum for testpurposes and shouldn't be used in production code!
         */
        return $this->strLastCheckSum;
        // @codeCoverageIgnoreEnd
    }

    /**
     * Calculate modulo 97 checksum for bankcode and accountnumber
     * MOD 97-10 (see ISO 7064)
     * @param string $strCheck
     * @return string
     */
    protected function getCheckSum(string $strCheck) : string
    {
        // calculate checksum
        // 1. move 6 digit feft and add numerical countrycode
        $strCS1 = $this->adjustFP(bcadd(bcmul($strCheck, '1000000'), $this->getAlpha2CntryCode() . '00'));
        // 2. modulo 97 value
        $strCS2 = $this->adjustFP(bcmod($strCS1, '97'));
        // 3. subtract value from 98
        $strCS = $this->adjustFP(bcsub('98', $strCS2));
        // 4. always 2 digits...
        if (strlen($strCS) < 2) {
            $strCS = '0' . $strCS;
        }
        $this->strLastCheckSum = $strCS;
        return $strCS;
    }

    /**
     * In some cases there appears unwanted decimals (floatingpoint drift from bc - operations)
     * ... just cut them off
     *
     * @param string $str
     * @return string
     */
    protected function adjustFP(string $str) : string
    {
        // @codeCoverageIgnoreStart
        /*
         * Note:
         * This problem actually occurred in practice, unfortunately at the time I wrote
         * the tests, I no longer have any concrete sample data that cause this error.
         * This means that I am currently not in a position to intentionally induce the
         * error in order to test its correct handling.
         * That's why I take the function out of the coverage so that I don't have to look
         * over and over again with every run to see what is not covered ...
         */
        if (strpos('.', $str) !== false) {
            $str = substr($str, 0, strpos('.', $str));
        }
        return $str;
        // @codeCoverageIgnoreEnd
    }

    /**
     * Get the ALPHA-2 country code.
     * To calc the checksum, the first four digits of the IBAN (country code and check digit)
     * have to be placed at the end of the IBAN. Check digit is represented by 00 for calculation.
     * @return string
     */
    protected function getAlpha2CntryCode() : string
    {
        $strNumCode = $this->convCharToNum($this->strCntry[0]) . $this->convCharToNum($this->strCntry[1]);
        return $strNumCode;
    }

    /**
     * Replace all alpha chars with it's numeric substitution.
     * @param string $strCheck
     * @return string
     */
    protected function replaceAlpha(string $strCheck) : string
    {
        // account number may contains characters
        foreach (range('A', 'Z') as $ch) {
            $strCheck = str_replace((string)$ch, $this->convCharToNum((string)$ch), $strCheck);
        }
        return $strCheck;
    }

    /**
     * Existing non-numeric characters must be converted to a numeric value for the calculation.
     *
     *  A = 10  F = 15  K = 20  P = 25  U = 30  Z = 35
     *  B = 11  G = 16  L = 21  Q = 26  V = 31
     *  C = 12  H = 17  M = 22  R = 27  W = 32
     *  D = 13  I = 18  N = 23  S = 28  X = 33
     *  E = 14  J = 19  O = 24  T = 29  Y = 34
     *
     * @param string $ch
     * @return string
     */
    protected function convCharToNum(string $ch) : string
    {
        $iValue = ord($ch) - ord('A') + 10;
        return strval($iValue);
    }
}

1			<?php
2			namespace SKien\Sepa\CntryValidation;
3
4			use SKien\Sepa\Sepa;
5
6			/**
7			* Base class for country specific validation for IBAN, BIC and CI.
8			*
9			* Needed methods to calculate checksum and check the format of
10			* the values.
11			* Format check is made with regular expressions that can be set to
12			* the country specific rules.
13			*
14			* Create for each country to support a class extending this class.
15			* For most of the participating countries, it is sufficient to
16			* specify in the constructor the respective length, the formatting
17			* rule (RegEx) and the information whether alphanumeric characters
18			* are allowed.
19			*
20			* If more complicated rules apply in a country, the respective
21			* method for validation can be redefined in the extended class in
22			* order to map this rule.
23			* @see SepaCntryValidationBE class
24			*
25			* @package Sepa
26			* @author Stefanius <[email protected]>
27			* @copyright MIT License - see the LICENSE file for details
28			*/
29			class SepaCntryValidationBase implements SepaCntryValidation
30			{
31			/** @var string 2 digit ISO country code (ISO 3166-1) */
32			protected string $strCntry = '';
33			/** @var int length of the IBAN */
34			protected int $iLenIBAN = -1;
35			/** @var string regular expression to validate the format of the IBAN */
36			protected string $strRegExIBAN = '';
37			/** @var bool if true, alphanum values in the IBAN allowed */
38			protected bool $bAlphaNumIBAN = false;
39			/** @var int length of the IC */
40			protected int $iLenCI = -1;
41			/** @var string regular expression to validate the format of the CI */
42			protected string $strRegExCI = '';
43			/** @var bool if true, alphanum values in the CI allowed */
44			protected bool $bAlphaNumCI = false;
45			/** @var string last calculated checksum */
46			protected string $strLastCheckSum = '';
47
48			/**
49			* Create instance of validation.
50			* This constructor checks, if the country code from the parameter equals to the
51			* code defined in the extension class. This prevents the wrong class from being used
52			* for validation for a given country.
53			* @param string $strCntry 2 sign country code
54			*/
55			public function __construct(string $strCntry)
56			{
57			if (strtoupper($strCntry) != $this->strCntry) {
58			trigger_error('instanciation with invalid country ' . $strCntry . ' (expected ' . $this->strCntry . ')', E_USER_ERROR);
59			}
60			}
61
62			/**
63			* Validates given IBAN.
64			*
65			* @link https://www.ecbs.org/iban.htm
66			* @link http://www.pruefziffernberechnung.de/I/IBAN.shtml
67			*
68			* @param string $strIBAN IBAN to validate
69			* @return int Sepa::OK or errorcode <ul>
70			* <li><b> Sepa::ERR_IBAN_INVALID_CNTRY </b> invalid country code </li>
71			* <li><b> Sepa::ERR_IBAN_INVALID_LENGTH </b> invalid length </li>
72			* <li><b> Sepa::ERR_IBAN_INVALID_SIGN </b> IBAN contains invalid sign(s) </li>
73			* <li><b> Sepa::ERR_IBAN_CHECKSUM </b> wrong checksum </li></ul>
74			*/
75			public function validateIBAN(string $strIBAN) : int
76			{
77			// toupper, trim and remove containing blanks
78			$strIBAN = str_replace(' ', '', trim(strtoupper($strIBAN)));
79			if (strlen($strIBAN) != $this->iLenIBAN) {
80			return Sepa::ERR_IBAN_INVALID_LENGTH;
81			}
82			if (substr($strIBAN, 0, 2) != $this->strCntry) {
83			return Sepa::ERR_IBAN_INVALID_CNTRY;
84			}
85			if (!preg_match($this->strRegExIBAN, $strIBAN)) {
86			return Sepa::ERR_IBAN_INVALID_SIGN;
87			}
88
89			$strCS = substr($strIBAN, 2, 2);
90			$strBBAN = substr($strIBAN, 4);
91
92			// alphanumeric account number allowed (except the country code...)?
93			if ($this->bAlphaNumIBAN) {
94			$strBBAN = $this->replaceAlpha($strBBAN);
95			}
96			if ($this->getCheckSum($strBBAN) != $strCS) {
97			return Sepa::ERR_IBAN_CHECKSUM;
98			}
99			return Sepa::OK;
100			}
101
102			/**
103			* Validates given BIC.
104			* Follows <b> ISO 9362 </b><br>
105			* as far as I have determined, the format of the BIC is uniform within
106			* the participating countries for SEPA.
107			* @param string $strBIC BIC to validate
108			* @return int Sepa::OK or errorcode<ul>
109			* <li><b> Sepa::ERR_BIC_INVALID </b> invalid BIC </li>
110			* <li><b> Sepa::ERR_BIC_INVALID_CNTRY </b> invalid country code </li></ul>
111			*/
112			public function validateBIC(string $strBIC) : int
113			{
114			if (substr($strBIC, 4, 2) != $this->strCntry) {
115			return Sepa::ERR_BIC_INVALID_CNTRY;
116			}
117			$iErr = Sepa::ERR_BIC_INVALID;
118			if (preg_match('/^([A-Z]){4}([A-Z]){2}([0-9A-Z]){2}([0-9A-Z]{3})?$/', $strBIC)) {
119			$iErr = Sepa::OK;
120			}
121			return $iErr;
122			}
123
124			/**
125			* Validates given CI (Creditor Scheme Identification).
126			*
127			* The general structure for the CI is the following:
128			* - Position 1-2 filled with the ISO country code
129			* - Position 3-4 filled with the check digit according to ISO 7064 Mod 97-10
130			* - Position 5-7 filled with the Creditor Business Code, if not used then filled with ZZZ
131			* - Position 8 onwards filled with the country specific part of the identifier being
132			* a national identifier of the Creditor as defined by the concerned national community.
133			*
134			* NOTE: the CBC is not taken into account when calculating the checksum!
135			*
136			* @link https://www.sepaforcorporates.com/sepa-direct-debits/sepa-creditor-identifier/
137			* @link https://www.europeanpaymentscouncil.eu/sites/default/files/kb/file/2019-09/EPC262-08%20v7.0%20Creditor%20Identifier%20Overview_0.pdf
138			* @link https://www.europeanpaymentscouncil.eu/sites/default/files/KB/files/EPC114-06%20SDD%20Core%20Interbank%20IG%20V9.0%20Approved.pdf#page=10
139			*
140			* online CI Validator
141			* @link http://www.maric.info/fin/SEPA/ddchkden.htm
142			*
143			* @param string $strCI CI to validate
144			* @return int Sepa::OK or errorcode<ul>
145			* <li><b> Sepa::ERR_CI_INVALID_CNTRY </b> invalid country code </li>
146			* <li><b> Sepa::ERR_CI_INVALID_LENGTH </b> invalid length </li>
147			* <li><b> Sepa::ERR_CI_INVALID_SIGN </b> CI contains invalid sign(s) </li>
148			* <li><b> Sepa::ERR_CI_CHECKSUM </b> wrong checksum </li></ul>
149			*/
150			public function validateCI(string $strCI) : int
151			{
152			// toupper, trim and remove containing blanks
153			$strCheck = str_replace(' ', '', trim(strtoupper($strCI)));
154			if (strlen($strCheck) != $this->iLenCI) {
155			return Sepa::ERR_CI_INVALID_LENGTH;
156			}
157			if (substr($strCheck, 0, 2) != $this->strCntry) {
158			return Sepa::ERR_CI_INVALID_CNTRY;
159			}
160			if (!preg_match($this->strRegExCI, $strCheck)) {
161			return Sepa::ERR_CI_INVALID_SIGN;
162			}
163
164			$strCS = substr($strCheck, 2, 2);
165			// NOTE: the CBC is not taken into account when calculating the checksum!
166			$strCheck = substr($strCheck, 7);
167			if ($this->bAlphaNumCI) {
168			$strCheck = $this->replaceAlpha($strCheck);
169			}
170			if ($this->getCheckSum($strCheck) != $strCS) {
171			return Sepa::ERR_CI_CHECKSUM;
172			}
173			return Sepa::OK;
174			}
175
176			/**
177			* Return last calculated checksum.
178			* This method is only for test purposes.
179			* @return string
180			* @internal
181			*/
182			public function getLastCheckSum() : string
183			{
184			// @codeCoverageIgnoreStart
185			/*
186			* Outside of coverge, since this method only can be used to retrieve
187			* any calculated checksum for testpurposes and shouldn't be used in production code!
188			*/
189			return $this->strLastCheckSum;
190			// @codeCoverageIgnoreEnd
191			}
192
193			/**
194			* Calculate modulo 97 checksum for bankcode and accountnumber
195			* MOD 97-10 (see ISO 7064)
196			* @param string $strCheck
197			* @return string
198			*/
199			protected function getCheckSum(string $strCheck) : string
200			{
201			// calculate checksum
202			// 1. move 6 digit feft and add numerical countrycode
203			$strCS1 = $this->adjustFP(bcadd(bcmul($strCheck, '1000000'), $this->getAlpha2CntryCode() . '00'));
204			// 2. modulo 97 value
205			$strCS2 = $this->adjustFP(bcmod($strCS1, '97'));
206			// 3. subtract value from 98
207			$strCS = $this->adjustFP(bcsub('98', $strCS2));
208			// 4. always 2 digits...
209			if (strlen($strCS) < 2) {
210			$strCS = '0' . $strCS;
211			}
212			$this->strLastCheckSum = $strCS;
213			return $strCS;
214			}
215
216			/**
217			* In some cases there appears unwanted decimals (floatingpoint drift from bc - operations)
218			* ... just cut them off
219			*
220			* @param string $str
221			* @return string
222			*/
223			protected function adjustFP(string $str) : string
224			{
225			// @codeCoverageIgnoreStart
226			/*
227			* Note:
228			* This problem actually occurred in practice, unfortunately at the time I wrote
229			* the tests, I no longer have any concrete sample data that cause this error.
230			* This means that I am currently not in a position to intentionally induce the
231			* error in order to test its correct handling.
232			* That's why I take the function out of the coverage so that I don't have to look
233			* over and over again with every run to see what is not covered ...
234			*/
235			if (strpos('.', $str) !== false) {
236			$str = substr($str, 0, strpos('.', $str));
237			}
238			return $str;
239			// @codeCoverageIgnoreEnd
240			}
241
242			/**
243			* Get the ALPHA-2 country code.
244			* To calc the checksum, the first four digits of the IBAN (country code and check digit)
245			* have to be placed at the end of the IBAN. Check digit is represented by 00 for calculation.
246			* @return string
247			*/
248			protected function getAlpha2CntryCode() : string
249			{
250			$strNumCode = $this->convCharToNum($this->strCntry[0]) . $this->convCharToNum($this->strCntry[1]);
251			return $strNumCode;
252			}
253
254			/**
255			* Replace all alpha chars with it's numeric substitution.
256			* @param string $strCheck
257			* @return string
258			*/
259			protected function replaceAlpha(string $strCheck) : string
260			{
261			// account number may contains characters
262			foreach (range('A', 'Z') as $ch) {
263			$strCheck = str_replace((string)$ch, $this->convCharToNum((string)$ch), $strCheck);
264			}
265			return $strCheck;
266			}
267
268			/**
269			* Existing non-numeric characters must be converted to a numeric value for the calculation.
270			*
271			* A = 10 F = 15 K = 20 P = 25 U = 30 Z = 35
272			* B = 11 G = 16 L = 21 Q = 26 V = 31
273			* C = 12 H = 17 M = 22 R = 27 W = 32
274			* D = 13 I = 18 N = 23 S = 28 X = 33
275			* E = 14 J = 19 O = 24 T = 29 Y = 34
276			*
277			* @param string $ch
278			* @return string
279			*/
280			protected function convCharToNum(string $ch) : string
281			{
282			$iValue = ord($ch) - ord('A') + 10;
283			return strval($iValue);
284			}
285			}

Stefanius67 / Sepa

SepaCntryValidationBase::validateCI() A last analyzed 2025-08-15 00:26 UTC

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SepaCntryValidationBase::validateCI() A
last analyzed 2025-08-15 00:26 UTC