如何使用 java 和 bouncy castle 仅解析 ASN.1 数据中的一个标签号

Question

我有这个 ASN.1 结构 ASN.1 editor image 并且想解析标签 12:

Tag: 12 (0x0C) : UTF8String
Offset: 82 (0x52)
Length: 39 (0x27)
Deepness: 7
Path: /0/1/0/0/0/1/0

并在变量中解析 UTF8String。

到目前为止，我可以解析整个 ASN.1 结构并将其转储为字符串：

ASN1Sequence responseASN1 = ASN1Sequence.getInstance(streamOut.toByteArray());
System.out.println(ASN1Dump.dumpAsString(responseASN1))

如何只显式解析标记 12 中的 UTF8String？

整个结构base64编码：

Offset|Length|LenByte|
======+======+=======+==========================================================================================
     0|  1574|      3|   SEQUENCE : 
     4|  1570|      3|      SEQUENCE : 
     8|    59|      1|         SEQUENCE : 
    10|     1|      1|            INTEGER : '2'
    13|    32|      1|            CONTEXT SPECIFIC (4) : 
    15|    30|      1|               SEQUENCE : 
    17|    28|      1|                  SET : 
    19|    26|      1|                     SEQUENCE : 
    21|     3|      1|                        OBJECT_IDENTIFIER : 'CN (2.5.4.3)'
    26|    19|      1|                        UTF8String : 'Ref Server Sign'
    47|     2|      1|            CONTEXT SPECIFIC (4) : '3000'
    51|     7|      1|            CONTEXT SPECIFIC (4) : 
    53|     5|      1|               OCTET_STRING : '3233343536'
    60|     7|      1|            CONTEXT SPECIFIC (6) : 
    62|     5|      1|               OCTET_STRING : '3132333435'
    69|    65|      1|         CONTEXT SPECIFIC (12) : 
    71|    63|      1|            SEQUENCE : 
    73|    48|      1|               SEQUENCE : 
    75|    46|      1|                  SEQUENCE : 
    77|     1|      1|                     INTEGER : '2'
    80|    41|      1|                     SEQUENCE : 
    82|    39|      1|                        UTF8String : 
      |      |       |                           **** SOME TEXT HERE *****
   123|    11|      1|               CONTEXT SPECIFIC (0) : 
   125|     9|      1|                  SEQUENCE : 
   127|     7|      1|                     SEQUENCE : 
   129|     2|      1|                        CONTEXT SPECIFIC (4) : '3000'
   133|     1|      1|                        INTEGER : '0'
   136|   261|      3|         CONTEXT SPECIFIC (0) : 
   140|   257|      3|            BIT_STRING : 
      |      |       |               Unused bits: 0 : 80F02B31BAA1C56A491DE8A2F66B0B26BDAFBBA3D211C6D4DEE
      |      |       |               5E08EDA9C126EFB1155B2D6F33AF1E51B556646A2D8333FEB45812CC6EA8796BB028
      |      |       |               CF3F8426582C359E3FC3BF1335BAF306F5459A8966CB2DCC59263798B5EE0073EED6
      |      |       |               6FE0B6B97F6941E4DC806C81EC1BC05103XX1808345E7EE52CD5A0230E3806E11707
      |      |       |               8F4DDBEE1E31C8D4DAD2EF7F611BB3192602E9DBC87F9CE51E3B3C88B8EEF9B0E352
      |      |       |               F4F76F41D6BB2FDE1959693AEE276E5F5AF58B70E366B2F304A097EA37C346FBB71A
      |      |       |               DB35DC4A9B1215C28C15971675A7E133D80938E9DE5CE40DE89D0AE1E8514A588183
      |      |       |               FB3D2A76318295F9E17CE9850C483B7D1F592C349F25009DF0348
   401|  1173|      3|         CONTEXT SPECIFIC (1) : 
   405|  1169|      3|            SEQUENCE : 
   409|  1165|      3|               SEQUENCE : 
   413|   885|      3|                  SEQUENCE : 
   417|     3|      1|                     CONTEXT SPECIFIC (0) : 
   419|     1|      1|                        INTEGER : '2'
   422|     3|      1|                     INTEGER : '1041084'
   427|    13|      1|                     SEQUENCE : 
   429|     9|      1|                        OBJECT_IDENTIFIER : 
      |      |       |                           sha256RSA (1.2.840.113549.1.1.11)
   440|     0|      1|                        NULL : 
   442|    82|      1|                     SEQUENCE : 
   444|    11|      1|                        SET : 
   446|     9|      1|                           SEQUENCE : 
   448|     3|      1|                              OBJECT_IDENTIFIER : 'C (2.5.4.6)'
   453|     2|      1|                              PrintableString : 'DE'
   457|    21|      1|                        SET : 
   459|    19|      1|                           SEQUENCE : 
   461|     3|      1|                              OBJECT_IDENTIFIER : 'O (2.5.4.10)'
   466|    12|      1|                              UTF8String : 'xxx GmbH'
   480|    44|      1|                        SET : 
   482|    42|      1|                           SEQUENCE : 
   484|     3|      1|                              OBJECT_IDENTIFIER : 'CN (2.5.4.3)'
   489|    35|      1|                              UTF8String : 
      |      |       |                                 xxxx CA 1 2013
   526|    30|      1|                     SEQUENCE : 
   528|    13|      1|                        UTCTime : '02.10.2013 08:35'
   543|    13|      1|                        UTCTime : '02.10.2016 08:35'
   558|    84|      1|                     SEQUENCE : 
   560|    11|      1|                        SET : 
   562|     9|      1|                           SEQUENCE : 
   564|     3|      1|                              OBJECT_IDENTIFIER : 'C (2.5.4.6)'
   569|     2|      1|                              PrintableString : 'DE'
   573|    21|      1|                        SET : 
   575|    19|      1|                           SEQUENCE : 
   577|     3|      1|                              OBJECT_IDENTIFIER : 'O (2.5.4.10)'
   582|    12|      1|                              UTF8String : 'xxx GmbH'
   596|    16|      1|                        SET : 
   598|    14|      1|                           SEQUENCE : 
   600|     3|      1|                              OBJECT_IDENTIFIER : 'OU (2.5.4.11)'
   605|     7|      1|                              UTF8String : 'xxx Ref'
   614|    28|      1|                        SET : 
   616|    26|      1|                           SEQUENCE : 
   618|     3|      1|                              OBJECT_IDENTIFIER : 'CN (2.5.4.3)'
   623|    19|      1|                              UTF8String : 'xxx Ref Server Sign'
   644|   290|      3|                     SEQUENCE : 
   648|    13|      1|                        SEQUENCE : 
   650|     9|      1|                           OBJECT_IDENTIFIER : 'RSA (1.2.840.113549.1.1.1)'
   661|     0|      1|                           NULL : 
   663|   271|      3|                        BIT_STRING : 
   668|   266|      3|                           SEQUENCE : 
   672|   257|      3|                              INTEGER : 
      |      |       |                                 19153099523146484059292732215299578117137448301078
      |      |       |                                 22320712819693302638639350004764330119567020112111
      |      |       |                                 33021320945769613342359459430171392983942265605905
      |      |       |                                 60839164992160243188690432360693388608468317837234
      |      |       |                                 91930117261812321151005968892783142439609888016233
      |      |       |                                 22502931257487500073934303608643859502519561447577
      |      |       |                                 89612175223822969660803847941953410193355206010092
      |      |       |                                 07062820173202616223265281104757059287534706329647
      |      |       |                                 31203532790680508259445351201491580410855116804105
      |      |       |                                 81369162640846631773755339740929460592785768465436
      |      |       |                                 02700392147999027479801904854088340166274608032800
      |      |       |                                 45071506684879775794009904138805504469703164292222
      |      |       |                                 06462205978224379
   933|     3|      1|                              INTEGER : '65537'
   938|   360|      3|                     CONTEXT SPECIFIC (3) : 
   942|   356|      3|                        SEQUENCE : 
   946|    29|      1|                           SEQUENCE : 
   948|     3|      1|                              OBJECT_IDENTIFIER : 
      |      |       |                                 Schlüsselkennung des Antragstellers (2.5.29.14)
   953|    22|      1|                              OCTET_STRING : 
   955|    20|      1|                                 OCTET_STRING : 
      |      |       |                                    BB3DAD8A2A318CBB76529DA98618C7F961D65CFD
   977|    56|      1|                           SEQUENCE : 
   979|     8|      1|                              OBJECT_IDENTIFIER : 
      |      |       |                                 Zugriff auf Stelleninformationen (1.3.6.1.5.5.7.1.
      |      |       |                                 1)
   989|    44|      1|                              OCTET_STRING : 
   991|    42|      1|                                 SEQUENCE : 
   993|    40|      1|                                    SEQUENCE : 
   995|     8|      1|                                       OBJECT_IDENTIFIER : 
      |      |       |                                          Onlinestatusprotokoll des Zertifikats (1.
      |      |       |                                          3.6.1.5.5.7.48.1)
  1005|    28|      1|                                       CONTEXT SPECIFIC (6) : 
      |      |       |                                          http://xxxx/
  1035|    31|      1|                           SEQUENCE : 
  1037|     3|      1|                              OBJECT_IDENTIFIER : 
      |      |       |                                 Stellenschlüsselkennung (2.5.29.35)
  1042|    24|      1|                              OCTET_STRING : 
  1044|    22|      1|                                 SEQUENCE : 
  1046|    20|      1|                                    CONTEXT SPECIFIC (0) : 
      |      |       |                                       BEDAED88D5CAC1977AFE9BB1B14EED7294CC55DD
  1068|    14|      1|                           SEQUENCE : 
  1070|     3|      1|                              OBJECT_IDENTIFIER : 
      |      |       |                                 Schlüsselverwendung (2.5.29.15)
  1075|     1|      1|                              BOOLEAN : 'True'
  1078|     4|      1|                              OCTET_STRING : 
  1080|     2|      1|                                 BIT_STRING : 'Unused bits: 4 : B0'
  1084|   215|      2|                           SEQUENCE : 
  1087|     3|      1|                              OBJECT_IDENTIFIER : 
      |      |       |                                 Sperrlisten-Verteilungspunkte (2.5.29.31)
  1092|   207|      2|                              OCTET_STRING : 
  1095|   204|      2|                                 SEQUENCE : 
  1098|   201|      2|                                    SEQUENCE : 
  1101|   198|      2|                                       CONTEXT SPECIFIC (0) : 
  1104|   195|      2|                                          CONTEXT SPECIFIC (0) : 
  1107|   125|      1|                                             CONTEXT SPECIFIC (6) : 
      |      |       |                                                ldap://xxxxC=DE?certi
      |      |       |                                                ficaterevocationlist
  1234|    66|      1|                                             CONTEXT SPECIFIC (6) : 
      |      |       |                                                http://xxxxca_1_2013.crl
  1302|    13|      1|                  SEQUENCE : 
  1304|     9|      1|                     OBJECT_IDENTIFIER : 'sha256RSA (1.2.840.113549.1.1.11)'
  1315|     0|      1|                     NULL : 
  1317|   257|      3|                  BIT_STRING : 
      |      |       |                     Unused bits: 0 : 8054D6DCD9DB7E14E35DF169FB6FB06EDD7E6ADE542C0
      |      |       |                     43F95C459784BBB325EEB59CA911FE7F92B7695CA26FDEA8679C66F05D671F
      |      |       |                     9F34FC9D4E7792A81A01F4C1EAF9CEF5387708E74BDA48BA57D64F3CE332E6
      |      |       |                     3606290852D3CF0BF9238F4AE172E30B2F4D6297D3071595F41989DF97098F
      |      |       |                     443AD4115576E43AC4A65E1ED3874193709A4D817B241B0E9473894E3591FD
      |      |       |                     525C1521ED6BACBB4682F7CD0356369DB154635EB9817FAF73DADE01999FAA
      |      |       |                     7E08A66AB56979D911FDC1605616B8CCBADF698917CA7321A45B9C1948189D
      |      |       |                     1F01CF9C6F19C2929E55F8079725B106F54011F63357D25F7E25A113D00501
      |      |       |                     CC8B990A12D7ED5A0ECD9C633CF71CC04


Answer 1

我无法重新创建整个结构，但我已经根据您提供的图像编写了一些代码。我正在使用 BouncyCastle 1.56

查看ASN.1结构，基本上是（省略一些数据以使其更简单）：

SEQUENCE : // 1 (I'm assuming this is responseASN1)
    SEQUENCE : // 2 (first element of sequence 1)
        SEQUENCE : // 3 (first element of sequence 2)
            ... tag 12 is not here
        CONTEXT SPECIFIC (12) : // 4 (second element of sequence 2)
            SEQUENCE : // 5 (tag 12 value)
                SEQUENCE : // 6 (first element of sequence 5)
                    SEQUENCE : // 7 (first element of sequence 6)
                        INTEGER: // (first element of sequence 7)
                        SEQUENCE: // 8 (second element of sequence 7)
                            UTF8String: // 9 (first element of sequence 8)
                                ******* SOME TEXT HERE ****

请注意，我添加了一些数字以使我的答案更加清晰。

所以，要得到UTF8String，你必须经过这个结构。考虑到responseASN1是序列1，可以做如下操作：

ASN1Sequence seq2 = (ASN1Sequence) responseASN1.getObjectAt(0); // get sequence 2
// ignore sequence 3, because tag 12 is in CONTEXT SPECIFIC 
DERTaggedObject contextSpecific = (DERTaggedObject) seq2.getObjectAt(1); // the second element of sequence 2
ASN1Sequence seq5 = (ASN1Sequence) contextSpecific.getObject(); // get sequence 5
ASN1Sequence seq6 = (ASN1Sequence) seq5.getObjectAt(0); // get sequence 6
ASN1Sequence seq7 = (ASN1Sequence) seq6.getObjectAt(0); // get sequence 7
ASN1Sequence seq8 = (ASN1Sequence) seq7.getObjectAt(1); // get sequence 8 (second element of sequence 7)
DERUTF8String utf8String = (DERUTF8String) seq8.getObjectAt(0); // finally get the UTF8String
System.out.println(utf8String.getString()); // the string you want

如何使用 java 和 bouncy castle 仅解析 ASN.1 数据中的一个标签号

How to parse only one tag number in ASN.1 data with java and bouncy castle

java

bouncycastle

asn.1

pki