Hola 馃檪 en esta聽post聽se deja a disposici贸n de la comunidad de programadores 聽que quiera aprender un poquito sobre聽Facturaci贸n Virtual, 聽el generador de C贸digo de Control versi贸n 7.0 construido聽seg煤n聽la documentaci贸n provista聽por Impuestos Nacionales de Bolivia (SIN).
驴Que es C#?
C# es un lenguaje de programaci贸n que se ha dise帽ado para compilar diversas aplicaciones que se ejecutan en .NET Framework. C# es simple, eficaz, con seguridad de tipos y orientado a objetos. Las numerosas innovaciones de C# permiten desarrollar aplicaciones r谩pidamente y mantener la expresividad y elegancia de los lenguajes de estilo de C.
Recordemos los algoritmos utilizados por el generador de C贸digo de Control son:
Nuestro proyecto es el siguiente:
El c贸digo del generador se encuentra en el proyecto ControlCodeV7, las clases son:
AllegedRC4.cs
public static class AllegedRC4 { /// <summary> /// Criptografia simetrica /// <see cref="http://jc-mouse.net/"/> /// <param name="message">texto a encriptar</param> /// <param name="key">llave para encriptacion</param> /// <param name="unscripted">con guion o sin guion</param> /// <returns>mensaje encriptado</returns> /// </summary> public static String encryptMessageRC4(String message, String key, Boolean unscripted) { int[] state = new int[256]; int x = 0; int y = 0; int index1 = 0; int index2 = 0; int nmen; String messageEncryption = ""; for (int i = 0; i <= 255; i++) { state[i] = i; } for (int i = 0; i <= 255; i++) { index2 = (((int)key[index1]) + state[i] + index2) % 256; int aux = state[i]; state[i] = state[index2]; state[index2] = aux; index1 = (index1 + 1) % key.Length; } for (int i = 0; i < message.Length; i++) { x = (x + 1) % 256; y = (state[x] + y) % 256; int aux = state[x]; state[x] = state[y]; state[y] = aux; nmen = ((int)message[i]) ^ state[(state[x] + state[y]) % 256]; String nmenHex = nmen.ToString("X").ToUpper(); messageEncryption = messageEncryption + ((unscripted)?"":"-") + ((nmenHex.Length == 1) ? ("0" + nmenHex) : nmenHex); } return (unscripted)?messageEncryption:messageEncryption.Substring(1, messageEncryption.Length-1); } }
Base64SIN.cs
public class Base64SIN { /// <summary> /// Codificador base64 /// <see cref="http://jc-mouse.net/"/> /// <param name="value">Numero a codificar</param> /// <returns>Cadena codificada</returns> /// </summary> public static String convertBase64(int value) { String[] dictionary = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "+", "/" }; int quotient = 1; int remainder; String word = ""; while (quotient > 0) { quotient = value / 64; remainder = value % 64; word = dictionary[remainder] + word; value = quotient; } return word; } }
Verhoeff.cs
/// <summary> /// For more information cf. http://en.wikipedia.org/wiki/Verhoeff_algorithm /// Dihedral Group stuff: http://en.wikipedia.org/wiki/Dihedral_group /// Dihedral Group order 10: http://mathworld.wolfram.com/DihedralGroupD5.html /// </summary> public static class Verhoeff { // The multiplication table static int[,] d = new int[,] { {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, {1, 2, 3, 4, 0, 6, 7, 8, 9, 5}, {2, 3, 4, 0, 1, 7, 8, 9, 5, 6}, {3, 4, 0, 1, 2, 8, 9, 5, 6, 7}, {4, 0, 1, 2, 3, 9, 5, 6, 7, 8}, {5, 9, 8, 7, 6, 0, 4, 3, 2, 1}, {6, 5, 9, 8, 7, 1, 0, 4, 3, 2}, {7, 6, 5, 9, 8, 2, 1, 0, 4, 3}, {8, 7, 6, 5, 9, 3, 2, 1, 0, 4}, {9, 8, 7, 6, 5, 4, 3, 2, 1, 0} }; // The permutation table static int[,] p = new int[,] { {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, {1, 5, 7, 6, 2, 8, 3, 0, 9, 4}, {5, 8, 0, 3, 7, 9, 6, 1, 4, 2}, {8, 9, 1, 6, 0, 4, 3, 5, 2, 7}, {9, 4, 5, 3, 1, 2, 6, 8, 7, 0}, {4, 2, 8, 6, 5, 7, 3, 9, 0, 1}, {2, 7, 9, 3, 8, 0, 6, 4, 1, 5}, {7, 0, 4, 6, 9, 1, 3, 2, 5, 8} }; // The inverse table static int[] inv = { 0, 4, 3, 2, 1, 5, 6, 7, 8, 9 }; /// <summary> /// Validates that an entered number is Verhoeff compliant. /// NB: Make sure the check digit is the last one! /// </summary> /// <param name="num"></param> /// <returns>True if Verhoeff compliant, otherwise false</returns> public static bool validateVerhoeff(string num) { int c = 0; int[] myArray = StringToReversedIntArray(num); for (int i = 0; i < myArray.Length; i++) { c = d[c, p[(i % 8), myArray[i]]]; } return c == 0; } /// <summary> /// For a given number generates a Verhoeff digit /// Append this check digit to num /// </summary> /// <param name="num"></param> /// <returns>Verhoeff check digit as string</returns> public static string generateVerhoeff(string num) { int c = 0; int[] myArray = StringToReversedIntArray(num); for (int i = 0; i < myArray.Length; i++) { c = d[c, p[((i + 1) % 8), myArray[i]]]; } return inv[c].ToString(); } /// <summary> /// Converts a string to a reversed integer array. /// </summary> /// <param name="num"></param> /// <returns>Reversed integer array</returns> private static int[] StringToReversedIntArray(string num) { int[] myArray = new int[num.Length]; for (int i = 0; i < num.Length; i++) { try { myArray[i] = int.Parse(num.Substring(i, 1)); } catch (FormatException e) { if (e.Source != null) Console.WriteLine("FormatException source: {0}", e.Source); throw; } } Array.Reverse(myArray); return myArray; } }
ControlCode.cs
public static class ControlCode { /// <summary> /// Genera codigo de control /// <see cref="http://jc-mouse.net/"/> /// <param name="authorizationNumber">Numero de autorizacion</param> /// <param name="invoiceNumber">Numero de factura</param> /// <param name="nitci">N煤mero de Identificaci贸n Tributaria o Carnet de Identidad</param> /// <param name="dateOfTransaction">fecha de transaccion de la forma AAAAMMDD</param> /// <param name="transactionAmount">Monto de la transacci贸n</param> /// <param name="dosageKey">Llave de dosificaci贸n</param> /// <returns>Codigo de Control generado de la forma 6A-DC-53-05-14</returns> /// </summary> public static String generateControlCode(String authorizationNumber, String invoiceNumber, String nitci, String dateOfTransaction, String transactionAmount, String dosageKey) { //redondea monto de transaccion transactionAmount = roundUp(transactionAmount); /* ========== PASO 1 ============= */ invoiceNumber = addVerhoeffDigit(invoiceNumber, 2); nitci = addVerhoeffDigit(nitci, 2); dateOfTransaction = addVerhoeffDigit(dateOfTransaction, 2); transactionAmount = addVerhoeffDigit(transactionAmount, 2); //se suman todos los valores obtenidos Int64 sumOfVariables=0; try { sumOfVariables = Int64.Parse(invoiceNumber) + Int64.Parse(nitci) + Int64.Parse(dateOfTransaction) + Int64.Parse(transactionAmount); } catch (FormatException e) { if (e.Source != null) Console.WriteLine("FormatException source: {0}", e.Source); throw; } //A la suma total se a帽ade 5 digitos Verhoeff String sumOfVariables5Verhoeff = addVerhoeffDigit(sumOfVariables.ToString(), 5); /* ========== PASO 2 ============= */ String fiveDigitsVerhoeff = sumOfVariables5Verhoeff.Substring(sumOfVariables5Verhoeff.Length - 5); int[] numbers = new int[5]; for (int i = 0; i < 5; i++) { numbers[i] = Int32.Parse(fiveDigitsVerhoeff[i].ToString()) + 1; } String string1 = dosageKey.Substring(0, numbers[0]); String string2 = dosageKey.Substring(numbers[0], numbers[1]); String string3 = dosageKey.Substring(numbers[0] + numbers[1], numbers[2]); String string4 = dosageKey.Substring(numbers[0] + numbers[1] + numbers[2], numbers[3]); String string5 = dosageKey.Substring(numbers[0] + numbers[1] + numbers[2] + numbers[3], numbers[4]); String authorizationNumberDKey = authorizationNumber + string1; String invoiceNumberdKey = invoiceNumber + string2; String NITCIDKey = nitci + string3; String dateOfTransactionDKey = dateOfTransaction + string4; String transactionAmountDKey = transactionAmount + string5; /* ========== PASO 3 ============= */ //se concatena cadenas de paso 2 String stringDKey = authorizationNumberDKey + invoiceNumberdKey + NITCIDKey + dateOfTransactionDKey + transactionAmountDKey; //Llave para cifrado + 5 digitos Verhoeff generado en paso 2 String keyForEncryption = dosageKey + fiveDigitsVerhoeff; //se aplica AllegedRC4 String allegedRC4String = AllegedRC4.encryptMessageRC4(stringDKey, keyForEncryption,true); /* ========== PASO 4 ============= */ //se suman valores ascii int totalAmount = 0; int sp1 = 0; int sp2 = 0; int sp3 = 0; int sp4 = 0; int sp5 = 0; byte[] asciiBytes = Encoding.ASCII.GetBytes(allegedRC4String); int tmp = 1; for (int i=0; i< asciiBytes.Length;i++) { totalAmount += asciiBytes[i]; switch (tmp) { case 1: sp1 += asciiBytes[i]; break; case 2: sp2 += asciiBytes[i]; break; case 3: sp3 += asciiBytes[i]; break; case 4: sp4 += asciiBytes[i]; break; case 5: sp5 += asciiBytes[i]; break; } tmp = (tmp < 5) ? tmp + 1 : 1; } /* ========== PASO 5 ============= */ //suma total * sumas parciales dividido entre resultados obtenidos //entre el d铆gito Verhoeff correspondiente m谩s 1 (paso 2) int tmp1 = totalAmount * sp1 / numbers[0]; int tmp2 = totalAmount * sp2 / numbers[1]; int tmp3 = totalAmount * sp3 / numbers[2]; int tmp4 = totalAmount * sp4 / numbers[3]; int tmp5 = totalAmount * sp5 / numbers[4]; //se suman todos los resultados int sumProduct = tmp1 + tmp2 + tmp3 + tmp4 + tmp5; //se obtiene base64 String base64SIN = Base64SIN.convertBase64(sumProduct); /* ========== PASO 6 ============= */ //Aplicar el AllegedRC4 a la anterior expresi贸n obtenida return AllegedRC4.encryptMessageRC4(base64SIN, String.Concat(dosageKey,fiveDigitsVerhoeff),false); } /// <summary> /// A帽ade N digitos Verhoeff a una cadena de texto /// <param name="value">cadena donde se a帽adiran digitos Verhoeff</param> /// <param name="max">cantidad de digitos a agregar</param> /// <returns>cadena original + N digitos Verhoeff</returns> /// </summary> private static String addVerhoeffDigit(String value, int max) { for (int i = 1; i <= max; i++) { value= String.Concat(value, Verhoeff.generateVerhoeff(value)); } return value; } /// <summary> /// Transforma string a numero y redondea hacia arriba /// <param name="value">String numero de la forma 123 | 123.45 | 123,45 </param> /// <returns>String con el numero redondeado sin decimales</returns> /// </summary> private static String roundUp(String value) { char a = Convert.ToChar(CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator); value = (a == ',') ? value.Replace(".", ",") : (a=='.')? value.Replace(",", ".") : value; decimal decimalVal = System.Convert.ToDecimal(value); //redondea a 0 decimales return Math.Round(decimalVal, MidpointRounding.AwayFromZero).ToString(); } }
En el proyecto TestControlCode, implementamos el c贸digo necesario para testeat los 5000 casos que nos brinda Impuestos Nacionales. Por ejemplo para 1 caso podemos hacer lo siguiente:
String code = ControlCode.generateControlCode("29040011007", "1503", "4189179011", "20070702", "2500", "9rCB7Sv4X29d)5k7N%3ab89p-3(5[A" ); MessageBox.Show( code );
Eso es todo 馃檪
Detalles de proyecto
enjoy!!!!
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