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Como calcular o CRC do pix RRS feed

Respostas

  • Olá Mauricio. Obrigado mesmo por responder.

    consegui umas dicas e resolvi assim:

    public class Crc16CcittKermit
        {
            private ushort[] crcTable = {
          0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
        };
    
            public ushort ComputeChecksum(params byte[] buffer)
            {
                if (buffer == null) throw new ArgumentNullException();
                ushort crc = 0xFFFF;
                for (int i = 0; i < buffer.Length; ++i)
                {
                    byte c = buffer[i];
                    int j = (ushort)(c ^ (crc >> 8)) & 0xFF;
                    //crc = (ushort)((crc >> 8) ^ table[(crc ^ buffer[i]) & 0xff]);
                    crc = (ushort)(crcTable[j] ^ (crc << 8));
                }
    
                var answer = ((crc ^ 0) & 0xFFFF);
    
                return crc;
            }
    
            public byte[] ComputeChecksumBytes(params byte[] buffer)
            {
                return BitConverter.GetBytes(ComputeChecksum(buffer));
            }
    
         }
    
    
    
    
    exemplo consumo:
    
    ...
      StringBuilder dadosQR1 = new StringBuilder();
    
                                                        //Estatico
                                               dadosQR1.Append("000201"); //Fixo
    ...
    
    
      dadosQR1.Append("6304");
    
      var bytes = System.Text.Encoding.UTF8.GetBytes(dadosQR1.ToString().Trim());
      ushort crc = new Crc16().ComputeChecksum(bytes);
    
      dadosQR1.Append(crc.ToString("x4").ToUpper());
    

    Espero que ajude outras pessoas.

    att.

    • Marcado como Resposta Jose Geraldo segunda-feira, 1 de fevereiro de 2021 16:30
    segunda-feira, 1 de fevereiro de 2021 15:09

Todas as Respostas

  • Ola José,

    Achei os artigos abaixo que tem vários exemplos que podem ajudar com o seu projeto. Também seria uma boa idéia consultar com o suporte da Pix e ver se eles têm alguma documentação para ajudar com os cálculos do CRC16. Mais espero que esses artigos ajudem.

    https://www.embeddedrelated.com/showcode/295.php

    https://stackoverflow.com/questions/31953396/calculating-crc16-in-c-sharp

    https://csharp.hotexamples.com/examples/-/Crc16/-/php-crc16-class-examples.html


    segunda-feira, 1 de fevereiro de 2021 12:45
    Moderador
  • Olá Mauricio. Obrigado mesmo por responder.

    consegui umas dicas e resolvi assim:

    public class Crc16CcittKermit
        {
            private ushort[] crcTable = {
          0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
        };
    
            public ushort ComputeChecksum(params byte[] buffer)
            {
                if (buffer == null) throw new ArgumentNullException();
                ushort crc = 0xFFFF;
                for (int i = 0; i < buffer.Length; ++i)
                {
                    byte c = buffer[i];
                    int j = (ushort)(c ^ (crc >> 8)) & 0xFF;
                    //crc = (ushort)((crc >> 8) ^ table[(crc ^ buffer[i]) & 0xff]);
                    crc = (ushort)(crcTable[j] ^ (crc << 8));
                }
    
                var answer = ((crc ^ 0) & 0xFFFF);
    
                return crc;
            }
    
            public byte[] ComputeChecksumBytes(params byte[] buffer)
            {
                return BitConverter.GetBytes(ComputeChecksum(buffer));
            }
    
         }
    
    
    
    
    exemplo consumo:
    
    ...
      StringBuilder dadosQR1 = new StringBuilder();
    
                                                        //Estatico
                                               dadosQR1.Append("000201"); //Fixo
    ...
    
    
      dadosQR1.Append("6304");
    
      var bytes = System.Text.Encoding.UTF8.GetBytes(dadosQR1.ToString().Trim());
      ushort crc = new Crc16().ComputeChecksum(bytes);
    
      dadosQR1.Append(crc.ToString("x4").ToUpper());
    

    Espero que ajude outras pessoas.

    att.

    • Marcado como Resposta Jose Geraldo segunda-feira, 1 de fevereiro de 2021 16:30
    segunda-feira, 1 de fevereiro de 2021 15:09
  • Ola José,

    Bom saber que foi resolvido. Muito obrigado pela informação. Isso vai nos ajudar.

    Você poderia marcar esta postagem como atendida/resolvida por favor?

    Agradeço
    segunda-feira, 1 de fevereiro de 2021 16:14
    Moderador
  • Function crc_ccitt_ffff(strParam As String) As String
      Const CRC_POLY_CCITT       As Long = &H1021&
      Const CRC_START_CCITT_FFFF As Long = &HFFFF&

      Dim crc As Long, b() As Byte, c As Long, i As Long, j As Long
      Dim crc_tabccitt(0 To 255) As Long
                                                                              
      '********** ********** NÃO UTILIZAR CARACTERES ACENTUADOS !!! ********** **********
                                                                             
      For i = 0 To 255
          crc = 0
          c = i * 256
          For j = 0 To 7
              If (crc Xor c) And 32768 Then
                 crc = (crc * 2) Xor CRC_POLY_CCITT
              Else
                 crc = crc * 2
              End If
              c = c * 2
              Next j
          crc_tabccitt(i) = crc
      Next i
                                                                              
      b = strParam
      crc = CRC_START_CCITT_FFFF
      For i = 0 To UBound(b) Step 2
          crc = (crc * 256) Xor crc_tabccitt(((crc \ 256) Xor b(i)) And 255)
          crc = ((crc \ 65536) * 65536) Xor crc
      Next i
      crc_ccitt_ffff = Hex(crc)
    End Function
    sábado, 11 de junho de 2022 13:41