IBAN验证程序Swift

问题描述

我正在编写一种算法来验证Swift 3中的IBAN(国际银行帐号)，但无法找到其中一种验证方式.

I am writing an algorithm to validate IBAN (International Bank Account Number) in Swift 3 and not able to figure one of the validation.

示例IBAN-BE68539007547034

Example IBAN - BE68539007547034

以下是验证规则-

1. 输入数字的长度应为16.
2. 前2个字符是国家/地区代码(不是数字).
3. 最后14个数字.
4. 最后2个字符是前12个数字字符的模97结果.

虽然#1-#3很清楚，但我需要在#4上保持清晰.如果有人以前曾经做过此事并且对此有所了解，请告诉我.

While #1 - #3 are clear I need clarity on #4. If anyone have done this before and know about it then please let me know.

推荐答案

来自 Wikipedia

let IBAN = "GB82WEST12345698765432" // uppercase, no whitespace !!!!
var a = IBAN.utf8.map{ $0 }
while a.count < 4 {
    a.append(0)
}
let b = a[4..<a.count] + a[0..<4]
let c = b.reduce(0) { (r, u) -> Int in
    let i = Int(u)
    return i > 64 ? (100 * r + i - 55) % 97: (10 * r + i - 48) % 97
}
print( "IBAN \(IBAN) is", c == 1 ? "valid": "invalid")

打印

IBAN GB82WEST12345698765432 is valid

使用您问题中的IBAN进行打印

With IBAN from your question it prints

IBAN BE68539007547034 is valid

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