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Thread: Calculating CRC with Gamma Command

  1. #1
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    Calculating CRC with Gamma Command

    Is anyone able to assist with clarifying & calculating the correct CRC (XX) for this Gamma Command:

    020100000038F4C5DFB319879422CB61AFB1B28A838C324A1A 7D6E94BA5074A25CF4AEEECB9B44D19E01608F9B6D78412C6C 80D42AF3AB9B94003CF9CDXX

    I believe it should be E1 however I am not sure if the CRC Tool is working properly.

  2. #2
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    Re: Calculating CRC with Gamma Command

    Just a quick note that I have worked this one out.

    Thanks to all those members that have helped me out.

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    Re: Calculating CRC with Gamma Command

    Quote Originally Posted by techoman View Post
    Is anyone able to assist with clarifying & calculating the correct CRC (XX) for this Gamma Command:

    020100000038F4C5DFB319879422CB61AFB1B28A838C324A1A 7D6E94BA5074A25CF4AEEECB9B44D19E01608F9B6D78412C6C 80D42AF3AB9B94003CF9CDXX

    I believe it should be E1 however I am not sure if the CRC Tool is working properly.
    xor all bytes than the result byte xor it on 0x3f , thats all

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    Re: Calculating CRC with Gamma Command

    Quote Originally Posted by ladrono15 View Post
    xor all bytes than the result byte xor it on 0x3f , thats all
    Thanks for the reply

    This may look simple however now I think I am lost.

    "xor all bytes" ... with what??

    There is a Gamma CRC calculator available and that does not seem to help either??

  5. #5
    Senior Member michael318's Avatar
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    Re: Calculating CRC with Gamma Command

    Quote Originally Posted by techoman View Post
    Thanks for the reply

    This may look simple however now I think I am lost.

    "xor all bytes" ... with what??

    There is a Gamma CRC calculator available and that does not seem to help either??
    where i can find that calculator??

  6. #6
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    Re: Calculating CRC with Gamma Command

    Here you go.

    If someone can explain how to use this properly or how to do it manually this would be much appreciated.

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    Re: Calculating CRC with Gamma Command

    Quote Originally Posted by techoman View Post
    Here you go.

    If someone can explain how to use this properly or how to do it manually this would be much appreciated.
    example :
    the crc in irdeto is after data
    so if u know c programming or algorithms

    unsigned char crc=0;//( initialize crc with 0)
    for(i=0;i<ur_data_size;i++)//start a loop from 0 pos till last byte
    crc^=ur_data[i]; //(crc =crc ^ ur_data[i]; xor crc on byte of pos i

    now we will insert the crc byte at the end of data (so ur data size will data size +1 (1 byte of crc)

    ur_data[ur_data_size]=crc^0x3f;// final task we xor the result crc on 0x3f and we save it at end of data

    i think is very clear to anybody
    b.r

  8. #8
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    Re: Calculating CRC with Gamma Command

    Thanks Buddy

    Appreciate the explanation

    I do not know C Programming, but one can always learn - I just love the challenge

  9. #9
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    Re: Calculating CRC with Gamma Command

    Can someone give an example with an actual string ?

  10. #10
    VIP Member mdrmc's Avatar
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    Re: Calculating CRC with Gamma Command

    great post if it actualy gets anywhere

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