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社区首页 >问答首页 >随机数据生成器applet返回`0x6F00‘

问随机数据生成器applet返回`0x6F00‘
EN

Stack Overflow用户
提问于 2015-04-28 11:22:15
回答 2查看 439关注 0票数 1

我编写了以下程序，使用两种不同的算法(ALG_SECURE_RANDOM和ALG_PSEUDO_RANDOM)生成不同长度的随机数。

APDU命令中的P1和P2按照顺序指定算法和随机长度。

  • P1 = 0X01：ALG_SECURE_RANDOM
  • P1 = 0X02：ALG_PSEUDO_RANDOM
  • P2 =随机数长度 公共类RandGen扩展Applet { byte[] generatedArray；byte[] generatedRandom；RandomData randomDataSecure = RandomData .getInstance(RandomData.ALG_SECURE_RANDOM)；RandomData randomDataPseudo = RandomData .getInstance(RandomData.ALG_PSEUDO_RANDOM)；private RandGen() {}公共静态空安装(字节bArray[]，short bOffset，字节RandGen)抛出{新#()()；}公共空进程(Apdu apdu)抛出{ if (()){返回；} byte[]缓冲器= apdu.getBuffer()；generatedArray = JCSystem.makeTransientByteArray( (短) bufferISO7816.OFFSET_P2，JCSystem.CLEAR_ON_DESELECT)；开关(bufferISO7816.OFFSET_P1) { case (0x01)：generatedRandom = secureRandomGenerator(apdu)；中断；大小写(0x02)：generatedRandom = pseudoRandomGenerator(apdu)；中断；默认:返回；} Util.arrayCopyNonAtomic(generatedRandom，(short) 0，buffer，(short) 0，(short) ISO7816.OFFSET_P2)；apdu.setOutgoingAndSend((short) 0，(short) ISO7816.OFFSET_P2)；} public byte[] secureRandomGenerator(APDU apdu) { byte[] byte[]= apdu.getBuffer()；randomDataSecure.generateData(generatedArray，(short) 0，(short) bufferISO7816.OFFSET_P2)；返回generatedArray；} public byte[] pseudoRandomGenerator(APDU apdu) { byte[]缓冲区= apdu.getBuffer()；randomDataPseudo.generateData(generatedArray，(short) 0，(short) bufferISO7816.OFFSET_P2)；返回generatedArray；} }

成功生成并上载到卡上的CAP文件，但是当我向卡发送APDU命令时，我收到0X6F00状态字：

代码语言：javascript
运行
复制
OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000202
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 02 02
Received (SW1=0x90, SW2=0x00)

OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000102
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 01 02
Received (SW1=0x6F, SW2=0x00)

我的小程序有什么问题吗？

更新：

根据dear @Vojta的回答，我替换

代码语言：javascript
运行
复制
Util.arrayCopyNonAtomic(generatedRandom, (short) 0, buffer, (short) 0,
        (short) ISO7816.OFFSET_P2);
apdu.setOutgoingAndSend((short) 0, (short) ISO7816.OFFSET_P2);

使用process()方法中的下列行：

代码语言：javascript
运行
复制
    Util.arrayCopyNonAtomic(generatedRandom, (short) 0, buffer, (short) 0,
            (short) buffer[ISO7816.OFFSET_P2]);
    apdu.setOutgoingAndSend((short) 0, (short) buffer[ISO7816.OFFSET_P2]);

现在，我在OpenSC工具输出中有了一个奇怪的输出：

安全随机发生器：

代码语言：javascript
运行
复制
OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000110
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 01 10
Received (SW1=0x90, SW2=0x00):
B8 1F 80 25 A2 8E 25 30 F8 22 F8 40 0F AE B0 6C ...%..%0.".@...l
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00                                  .....

OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000110
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 01 10
Received (SW1=0x6F, SW2=0x00)

OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000110
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 01 10
Received (SW1=0x90, SW2=0x00):
F6 45 A9 0C 0C 3B 3A 5A 5F DC A8 36 .E...;:Z_..6

伪随机发生器：

代码语言：javascript
运行
复制
OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000210
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 02 10
Received (SW1=0x90, SW2=0x00):
37 FD FC 67 EB 9E 21 00 6B E9 44 A7 21 3F 31 9A 7..g..!.k.D.!?1.
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00                            .......

OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000210
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 02 10
Received (SW1=0x6F, SW2=0x00)

OSC: opensc-tool.exe -s 00a404000b0102030405060708090000 -s 00000210
Using reader with a card: ACS CCID USB Reader 0
Sending: 00 A4 04 00 0B 01 02 03 04 05 06 07 08 09 00 00
Received (SW1=0x90, SW2=0x00)
Sending: 00 00 02 10
Received (SW1=0x90, SW2=0x00):
72 FE 48 1B 9A A0 BD 2D DF F9 E7 F8 58 CF B7 C0 r.H....-....X...
00 00 00 00 00 00 00 00 00 00 00                ...........

为什么对于单个命令有不同的输出？

javacard
EN

回答 2

Stack Overflow用户

回答已采纳

发布于 2015-04-28 13:08:19

您的代码中有一个小错误。你想要的

代码语言：javascript
运行
复制
Util.arrayCopyNonAtomic(generatedRandom, (short) 0, buffer, (short) 0,
            (short) buffer[ISO7816.OFFSET_P2]);

而不是

代码语言：javascript
运行
复制
Util.arrayCopyNonAtomic(generatedRandom, (short) 0, buffer, (short) 0,
            (short) ISO7816.OFFSET_P2);

一般规则:始终将process方法的内容包围在一个try-catch块中，并根据异常的类型和原因设置状态词。否则，您只会得到6F00，并且不知道实际发生了什么。如果您遵循这条规则，您就会知道抛出了ArrayIndexOutOfBoundsException。

更新答案：

奇怪的输出是由以下事实引起的

代码语言：javascript
运行
复制
Util.arrayCopyNonAtomic(generatedRandom, (short) 0, buffer, (short) 0,
            (short) buffer[ISO7816.OFFSET_P2]);
apdu.setOutgoingAndSend((short) 0, (short) buffer[ISO7816.OFFSET_P2]);

用一些随机值覆盖buffer[ISO7816.OFFSET_P2]，然后在下一行中使用该值。应该在buffer[ISO7816.OFFSET_P2]方法开始时将process存储在内存中：

代码语言：javascript
运行
复制
final byte p2 = buffer[ISO7816.OFFSET_P2];

对以下评论的答复：

P2 >= 0x80遇到了麻烦，因为将byte转换为short。不幸的是，JavaCard以签名的方式处理字节，这就是为什么P2 >= 0x80的长度为负数的原因。您可以很容易地通过以下方法来避免这种情况：

代码语言：javascript
运行
复制
final short outputLen = (short) (buffer[ISO7816.OFFSET_P2] & 0xFF);
票数 3
EN

Stack Overflow用户

发布于 2015-05-28 07:50:46

命令不支持，您有错误的指令连接在一起。

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/29918092

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