c - 如何在 C 中创建 APDU (TLV) 解析器

Question

例如我有这样的R-APDU

uchar rApdu[] = {0x6F, 0x35 ,0x84 ,0x08 ,0x45 ,0x4F ,0x50 ,
    0x43 ,0x43 ,0x41 ,0x52 ,0x44 ,0xA5 ,0x29 ,0x50 ,0x06 ,0x55 ,0x5A ,0x4B ,0x41 ,0x52 ,0x54 ,0x5F,
    0x2D, 0x06 ,0x75 ,0x7A ,0x72 ,0x75 ,0x65 ,0x6E ,0x87 ,0x01 ,0x01 ,0x9F ,0x11 ,0x01 ,0x01 ,0x9F,   
    0x12 ,0x06 ,0x55 ,0x5A ,0x4B ,0x41 ,0x52 ,0x54 ,0xBF ,0x0C ,0x05 ,0x9F ,0x4D ,0x02 ,0x0B ,0x0A};

我想用 C 语言解析这个 TLV，就像这个页面:parsed TLV

它应该解析所有标签及其值并接受结构。我试图解析，这就是我得到的:

#include <stdio.h>
#include <stdlib.h>


#define uchar unsigned char
#define uint unsigned int
#define ushort unsigned short

#define k6f 0x6F

typedef enum{
    false,
    true
}bool;

struct TAG{
    uchar *data;
    uint len;
};
struct TLVdata{
    struct TAG s6F;
    struct TAG s84;
    struct TAG sA5;
    struct TAG s50;
    struct TAG s5F2D;
    struct TAG s87;
    struct TAG s9F11;
    struct TAG s9F12;
    struct TAG sBF0C;
    struct TAG s9F4D;
};

static int readTLV(uchar rApdu[]);

int main(void){
    uchar rApdu[] = {0x6F, 0x35 ,0x84 ,0x08 ,0x45 ,0x4F ,0x50 ,
        0x43 ,0x43 ,0x41 ,0x52 ,0x44 ,0xA5 ,0x29 ,0x50 ,0x06 ,0x55 ,0x5A ,0x4B ,0x41 ,0x52 ,0x54 ,0x5F,
        0x2D, 0x06 ,0x75 ,0x7A ,0x72 ,0x75 ,0x65 ,0x6E ,0x87 ,0x01 ,0x01 ,0x9F ,0x11 ,0x01 ,0x01 ,0x9F,   
        0x12 ,0x06 ,0x55 ,0x5A ,0x4B ,0x41 ,0x52 ,0x54 ,0xBF ,0x0C ,0x05 ,0x9F ,0x4D ,0x02 ,0x0B ,0x0A};
    if (readTLV(rApdu) == 0)
        printf("ok!\n");
    system("PAUSE");
    return false;
}



static int readTLV(uchar rApdu[]){
    uint i, j, aLen, tLen, tlvIndex;
    struct TLVdata newtlv;
    aLen = sizeof(rApdu);
    tlvIndex = 0;

    switch(rApdu[tlvIndex]){
        case k6f:
        tLen = (int)rApdu[++tlvIndex];
        for(i=0; i <= tLen; i++, ++tlvIndex){
            if(rApdu[tlvIndex] == 0x84){
                newtlv.s84.len = (int)rApdu[++tlvIndex];
                ++tlvIndex;
                newtlv.s84.data = (char*)malloc(10*sizeof(char));
                for(j=0; j < newtlv.s84.len; j++, ++tlvIndex){
                    newtlv.s84.data[j] = rApdu[tlvIndex];
                }
                newtlv.s84.data[j] = '\0';
                printf("%s\n", newtlv.s84.data);
            }

        }
        break;
    }

    return 0;
}

我找到了一个解析器。只是它是用Java写的，不知道是用什么语言写的。有人可以帮忙吗？ apduparser

Answer 1

要实现 EMV TLV 数据解析，您需要遵循 ISO 8825-1 BER-TLV 编码规则，也称为 ASN.1 基本编码规则 (BER)。

简而言之，要提取正确的 BER-TLV 值，您需要分析标签 和长度 位以获得正确的大小。

那么你的样本缓冲区将是这样的:

tag: "6F"
len: "35" #  // 53
val:#"8408454F504343415244A5295006555A4B4152545F2D06757A7275656E87..0B0A"
- x84:#"8408454F504343415244"
  - tag: "84"
  - len: "08" #  // 8
  - val: "454F504343415244"
- xA5:#"A5295006555A4B4152545F2D06757A7275656E8701019F1101019F120655..0B0A"
  - tag: "A5"
  - len: "29" #  // 41
  - val:#"5006555A4B4152545F2D06757A7275656E8701019F1101019F1206555A4B..0B0A"
    - x50:#"5006555A4B415254"
      - tag: "50"
      - len: "06" #  // 6
      - val: "555A4B415254"
    - x5F2D:#"5F2D06757A7275656E"
      - tag: "5F2D"
      - len: "06" #  // 6
      - val: "757A7275656E"
    - x87:#"870101"
      - tag: "87"
      - len: "01" #  // 1
      - val: "01"
    - x9F11:#"9F110101"
      - tag: "9F11"
      - len: "01" #  // 1
      - val: "01"
    - x9F12:#"9F1206555A4B415254"
      - tag: "9F12"
      - len: "06" #  // 6
      - val: "555A4B415254"
    - xBF0C:#"BF0C059F4D020B0A"
      - tag: "BF0C"
      - len: "05" #  // 5
      - val:#"9F4D020B0A"
        - x9F4D:#"9F4D020B0A"
          - tag: "9F4D"
          - len: "02" #  // 2
          - val: "0B0A"

或者，如果您希望应用 EMV 分析:

# Cheef's parser.
# lib   : "/lib/EMV/" - EMV - Integrated Circuit Card Specifications for Payment Systems
# node  : "TLVs"

TLVs:#"6F358408454F504343415244A5295006555A4B4152545F2D06757A727565..0B0A" # EMV, Tag + Length + Value (TLV) series
- x6F:#"6F358408454F504343415244A5295006555A4B4152545F2D06757A727565..0B0A" # ISO 7816, Template, File Control Parameters and File Management Data (FCI)
  - tag: "6F"
  - len: "35" #  // 53
  - val:#"8408454F504343415244A5295006555A4B4152545F2D06757A7275656E87..0B0A"
    - x84:#"8408454F504343415244" # EMV, Dedicated File (DF) Name
      - tag: "84"
      - len: "08" #  // 8
      - val:#"454F504343415244" # Dedicated File (DF) Name.
        - RID: "454F504343" # Registered Application Provider Identifier (RID)
        - PIX: "415244" # Proprietary Application Identifier Extension (PIX)
    - xA5:#"A5295006555A4B4152545F2D06757A7275656E8701019F1101019F120655..0B0A" # EMV, Template, FCI A5
      - tag: "A5"
      - len: "29" #  // 41
      - val:#"5006555A4B4152545F2D06757A7275656E8701019F1101019F1206555A4B..0B0A"
        - x50:#"5006555A4B415254" # ISO 7816, Application Label
          - tag: "50"
          - len: "06" #  // 6
          - val: "555A4B415254" # Application Label. // UZKART
        - x5F2D:#"5F2D06757A7275656E" # ISO 7816, Language Preference
          - tag: "5F2D"
          - len: "06" #  // 6
          - val:#"757A7275656E" # Language Preference. // uzruen
            - A21: "uz" # ISO 639, Language Code (a2) // Uzbek
            - A22: "ru" # ISO 639, Language Code (a2) // Russian
            - A23: "en" # ISO 639, Language Code (a2) // English
        - x87:#"870101" # EMV, Application Priority Indicator
          - tag: "87"
          - len: "01" #  // 1
          - val:#"01" # Application Priority Indicator.
            - S01: "0" #  // Application may be selected without confirmation of cardholder
            - S02: "1" #  // No priority assigned
        - x9F11:#"9F110101" # EMV, Issuer Code Table Index
          - tag: "9F11"
          - len: "01" #  // 1
          - val: "01" # Issuer Code Table Index. // ISO 8859, Part 1
        - x9F12:#"9F1206555A4B415254" # EMV, Application Preferred Name
          - tag: "9F12"
          - len: "06" #  // 6
          - val: "555A4B415254" # Name, Application Preferred. // UZKART
        - xBF0C:#"BF0C059F4D020B0A" # EMV, FCI Issuer Discretionary Data
          - tag: "BF0C"
          - len: "05" #  // 5
          - val:#"9F4D020B0A" # FCI Issuer Discretionary Data.
            - x9F4D:#"9F4D020B0A" # EMV, Log Entry
              - tag: "9F4D"
              - len: "02" #  // 2
              - val:#"0B0A" # Log Entry.
                - B01: "0B" # SFI containing the cyclic transaction log file (binary) // 11
                - B02: "0A" # Maximum number of records in the transaction log file (binary) // 10