检查身份证号码合法性

verify_chinese_mainland_id_card.go

import "math"

// VerifyChineseMainlandIdCard 检查身份证号码合法性
//
// Wikipedia:
//   https://zh.wikipedia.org/wiki/中华人民共和国公民身份号码
//
// China gov:
//   http://www.stats.gov.cn/tjsj/tjbz/tjyqhdmhcxhfdm
//
func VerifyChineseMainlandIdCard(id []byte) bool {

	if len(id) != 18 {
		return false
	}

	var idx, sum, check_code int

	for ; idx < 17; idx++ {
		// (pow(2, 17 - index) % 11) * (id[index] - '0)
		sum += (int(math.Pow(float64(2), float64(17-idx))) % 11) * int(id[idx]-'0')
	}

	check_code = (12 - (sum % 11)) % 11

	if check_code < 10 {
		return check_code == int(id[17]-'0')
	} else {
		return id[17] == 'X' || id[17] == 'x'
	}
}

verify_chinese_mainland_id_card_test.go

func TestVerifyChineseMainlandIdCard(t *testing.T) {
	var ids = [][]byte{
		// male
		[]byte("11010119900307125X"),
		[]byte("110101199003070492"),
		[]byte("110101199003077053"),
		[]byte("110101199003075293"),
		[]byte("110101199003077010"),

		// female
		[]byte("110101199003078451"),
		[]byte("110101199003075234"),
		[]byte("110101199003070177"),
		[]byte("11010119900307977X"),
		[]byte("110101199003078339"),
	}

	for _, id := range ids {
		t.Logf("%s checked: %t\n", id, VerifyChineseMainlandIdCard(id))
	}
}