bash Tlv decdoder ready to run on terminal, just run bash ./tlv.sh <YOU TLV TO DECODE > works as EMVlab but in your own machine

gistfile1.txt

#!/usr/bin/env bash 

declare -A Atags 

Atags["57"]="Track 2 Equivalent Data"
Atags["4F"]="Application Identifier (AID) – card"
Atags["50"]="Application Label"
Atags["5A"]="Application Primary Account Number (PAN)"
Atags["82"]="Application Interchange Profile"
Atags["84"]="Dedicated File (DF) Name"
Atags["95"]="Terminal Verification Results"
Atags["9A"]="Transaction Date"
Atags["9B"]="Transaction Status Information"
Atags["9C"]="Transaction Type"
Atags["5F20"]="Cardholder Name"
Atags["5F24"]="Application Expiration Date"
Atags["5F25"]="Application Effective Date"
Atags["5F28"]="Issuer Country Code"
Atags["5F2A"]="Transaction Currency Code"
Atags["5F30"]="Service Code"
Atags["5F34"]="Application Primary Account Number (PAN) Sequence Number"
Atags["9F02"]="Amount, Authorised (Numeric)"
Atags["9F07"]="Application Usage Control"
Atags["9F09"]="Application Version Number"
Atags["9F0D"]="Issuer Action Code – Default"
Atags["9F0E"]="Issuer Action Code – Denial"
Atags["9F0F"]="Issuer Action Code – Online"
Atags["9F10"]="Issuer Application Data"
Atags["9F15"]="Merchant Category Code"
Atags["9F1A"]="Terminal Country Code"
Atags["9F1C"]="Terminal Identification"
Atags["9F21"]="Transaction Time"
Atags["9F26"]="Application Cryptogram"
Atags["9F27"]="Cryptogram Information Data"
Atags["9F33"]="Terminal Capabilities"
Atags["9F34"]="Cardholder Verification Method (CVM) Results"
Atags["9F35"]="Terminal Type"
Atags["9F36"]="Application Transaction Counter (ATC)"
Atags["9F37"]="Unpredictable Number"
Atags["9F39"]="Point-of-Service (POS) Entry Mode"
Atags["9F41"]="Transaction Sequence Counter"
Atags["9F03"]="Amount, Other (Numeric)"
Atags["9F53"]="Unknown tag"
Atags["9F1E"]="Interface Device (IFD) Serial Number"


tlv=$1 ;


tags=( 57 4F 50 5A 82 84 95 9A 9B 9C );


function contains {
    string=$1;
    substring=$2
    [[ $string =~ "$substring" ]] && echo true || echo false;
}

function containsTag {
    str=$1
    res=false;
    for tag in ${tags[@]}; do 
        cont=$( echo $( contains $str  $tag ) ) 
        if [[ $cont == true ]]; then 
            res=true;
            break
        fi 
    done 
    echo $res;
}


function hexToDec {
    hex_value=$1;
    dec=$((16#$hex_value));
    echo $(( $dec*2 ))
}



function parseTlv { 
    tlv="$1" ;

    header=${tlv:0:4}    

    if [[ $(echo $(containsTag $header)) = true ]]; then 
        head_len=4
        header=${tlv:0:2}    
        length=$( hexToDec ${tlv:2:2} ) 
        body=${tlv:4:$length}
    else 
        head_len=6
        header=${tlv:0:4}    
        length=$( hexToDec ${tlv:4:2} ) 
        body=${tlv:6:$length}
    fi 
    cut=$(( head_len + length ))


    echo "<--------------------------->"
    echo ${Atags["$header"]}
    echo "tag name:$header"
    echo "length: $length"
    echo "body: $body"
    echo "<--------------------------->"
}



function getLength { 
    tlv="$1" ;
   
    header=${tlv:0:4}    
    if [[ $(echo $(containsTag $header)) = true ]]; then 
        head_len=4
        length=$( hexToDec ${tlv:2:2} ) 
    else 
        head_len=6
        length=$( hexToDec ${tlv:4:2} ) 
    fi 
    cut=$(( head_len + length ))

    echo $cut 
}



function cutTlv {
    or_tlv=$1
    parsed=0;
    i=0
    while [[ (( $i -lt ${#or_tlv} )) ]] do
        tlv_cut=${or_tlv:$i};
        parseTlv $tlv_cut 
        parsed=$( getLength $tlv_cut )
        #parsed=$( parseTlv ${tlv:$i} | head -n 1 )
        i=$(( i + parsed ))
    done

}

    
#if [[ -z $2 ]]; then 
    #echo "works"
    #cutTlv $tlv
#else 
    #parseTlv 
#fi 

#echo ${Atags[84]}
#echo ${!Atags[@]}
cutTlv $tlv