+BankAcct

Author: Dmitry Ovsyanko

__tests__/isBankAcct.js

@@ -0,0 +1,13 @@
+const {isBankAcct, randomBankAcct} = require ('..')
+
+const BIC = '044525593', PRE = '40702810'
+
+test ('basic', () => {
+
+	expect (isBankAcct (PRE + '801400016513', BIC)).toBeUndefined ()
+
+	const a = randomBankAcct (BIC, {pre: [PRE]})
+
+	for (let i = 0; i < 1000; i ++) expect (isBankAcct (a, BIC)).toBeUndefined ()
+
+})

__tests__/isKPP.js

@@ -12,5 +12,4 @@ test ('basic', () => {
 	expect (isKPP (randomKPP ())).toBeUndefined ()
 	expect (randomKPP ({pre: ['77', '50']})).toMatch (/^(50|77)/)
 
-
 })

index.js

@@ -2,6 +2,7 @@ const Check = require ('./lib/Check')
 const {OGRN_13, OGRN_15} = require ('./lib/Horner')
 const {INN_10, INN_12_2, INN_12_1} = require ('./lib/INN')
 const SNILS = require ('./lib/SNILS')
+const BankAcct = require ('./lib/BankAcct')
 const {OKPO_8, OKPO_10} = require ('./lib/OKPO')
 class KPP extends Check {constructor () {super (9)}}
 
@@ -32,6 +33,9 @@ module.exports = {
 		new INN_12_1 ().verify (str.slice (0, 11))
 		new INN_12_2 ().verify (str)
 	},
-	randomINN12: () => new INN_12_2 ().appendCheckSum (new INN_12_1 ().random ())
+	randomINN12: () => new INN_12_2 ().appendCheckSum (new INN_12_1 ().random ()),
+
+	isBankAcct : (str, bic)    => new BankAcct ().verify (str, bic),
+	randomBankAcct: (bic, opt) => new BankAcct ().random (bic, opt),
 
 }

lib/BankAcct.js

@@ -0,0 +1,46 @@
+const Check = require ('./Check')
+const ScalarProduct = require ('./ScalarProduct')
+
+const COEF  = new Uint8Array ([7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1])
+const COEF0 = new Uint8Array ([7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 0, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1])
+
+class BankAcct extends ScalarProduct {
+
+	constructor () {
+
+		super (COEF, 0)
+
+		this.modulus1 = 10
+
+		this.bic = new Check (9)
+
+	}
+
+	verify (str, bic) {
+
+		this.bic.verify (bic)
+
+		super.verify (bic.slice (-3) + str)
+
+	}
+
+	random (bic, options) {
+
+		this.bic.verify (bic)
+
+		this.valueLength = 20
+
+		const str = super.randomValue (options), fullStr = bic.slice (-3) + str
+
+		this.coefficients = COEF0 
+		this.valueLength = COEF0.length
+
+		this.process (fullStr)		
+
+		return str.slice (0, 8) + ((this.sum % 10) * 3) % 10 + str.slice (9)
+
+	}
+
+}
+
+module.exports = BankAcct

lib/Check.js

@@ -85,9 +85,7 @@ module.exports = class {
 
 		this.mustBeEqual (str.length, this.totalLength, 'length')
 
-		const checkSum = this.checkSum (str); if (this.checkSumLength === 0) return
-
-		this.mustBeEqual (str.slice (this.valueLength), checkSum, 'checksum')
+		this.mustBeEqual (this.checkSumLength === 0 ? '0' : str.slice (this.valueLength), this.checkSum (str), 'checksum')
 
 	}