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ASN1_generate_nconf.pod 7.6 KB

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  1. =pod
  2. =head1 NAME
  3. ASN1_generate_nconf, ASN1_generate_v3 - ASN1 generation functions
  4. =head1 SYNOPSIS
  5. #include <openssl/asn1.h>
  6. ASN1_TYPE *ASN1_generate_nconf(const char *str, CONF *nconf);
  7. ASN1_TYPE *ASN1_generate_v3(const char *str, X509V3_CTX *cnf);
  8. =head1 DESCRIPTION
  9. These functions generate the ASN1 encoding of a string
  10. in an B<ASN1_TYPE> structure.
  11. I<str> contains the string to encode I<nconf> or I<cnf> contains
  12. the optional configuration information where additional strings
  13. will be read from. I<nconf> will typically come from a config
  14. file whereas I<cnf> is obtained from an B<X509V3_CTX> structure
  15. which will typically be used by X509 v3 certificate extension
  16. functions. I<cnf> or I<nconf> can be set to NULL if no additional
  17. configuration will be used.
  18. =head1 GENERATION STRING FORMAT
  19. The actual data encoded is determined by the string I<str> and
  20. the configuration information. The general format of the string
  21. is:
  22. =over 4
  23. =item [I<modifier>,]I<type>[:I<value>]
  24. =back
  25. That is zero or more comma separated modifiers followed by a type
  26. followed by an optional colon and a value. The formats of I<type>,
  27. I<value> and I<modifier> are explained below.
  28. =head2 Supported Types
  29. The supported types are listed below. Unless otherwise specified
  30. only the B<ASCII> format is permissible.
  31. =over 4
  32. =item B<BOOLEAN>, B<BOOL>
  33. This encodes a boolean type. The I<value> string is mandatory and
  34. should be B<TRUE> or B<FALSE>. Additionally B<TRUE>, B<true>, B<Y>,
  35. B<y>, B<YES>, B<yes>, B<FALSE>, B<false>, B<N>, B<n>, B<NO> and B<no>
  36. are acceptable.
  37. =item B<NULL>
  38. Encode the B<NULL> type, the I<value> string must not be present.
  39. =item B<INTEGER>, B<INT>
  40. Encodes an ASN1 B<INTEGER> type. The I<value> string represents
  41. the value of the integer, it can be prefaced by a minus sign and
  42. is normally interpreted as a decimal value unless the prefix B<0x>
  43. is included.
  44. =item B<ENUMERATED>, B<ENUM>
  45. Encodes the ASN1 B<ENUMERATED> type, it is otherwise identical to
  46. B<INTEGER>.
  47. =item B<OBJECT>, B<OID>
  48. Encodes an ASN1 B<OBJECT IDENTIFIER>, the I<value> string can be
  49. a short name, a long name or numerical format.
  50. =item B<UTCTIME>, B<UTC>
  51. Encodes an ASN1 B<UTCTime> structure, the value should be in
  52. the format B<YYMMDDHHMMSSZ>.
  53. =item B<GENERALIZEDTIME>, B<GENTIME>
  54. Encodes an ASN1 B<GeneralizedTime> structure, the value should be in
  55. the format B<YYYYMMDDHHMMSSZ>.
  56. =item B<OCTETSTRING>, B<OCT>
  57. Encodes an ASN1 B<OCTET STRING>. I<value> represents the contents
  58. of this structure, the format strings B<ASCII> and B<HEX> can be
  59. used to specify the format of I<value>.
  60. =item B<BITSTRING>, B<BITSTR>
  61. Encodes an ASN1 B<BIT STRING>. I<value> represents the contents
  62. of this structure, the format strings B<ASCII>, B<HEX> and B<BITLIST>
  63. can be used to specify the format of I<value>.
  64. If the format is anything other than B<BITLIST> the number of unused
  65. bits is set to zero.
  66. =item B<UNIVERSALSTRING>, B<UNIV>, B<IA5>, B<IA5STRING>, B<UTF8>,
  67. B<UTF8String>, B<BMP>, B<BMPSTRING>, B<VISIBLESTRING>,
  68. B<VISIBLE>, B<PRINTABLESTRING>, B<PRINTABLE>, B<T61>,
  69. B<T61STRING>, B<TELETEXSTRING>, B<GeneralString>, B<NUMERICSTRING>,
  70. B<NUMERIC>
  71. These encode the corresponding string types. I<value> represents the
  72. contents of this structure. The format can be B<ASCII> or B<UTF8>.
  73. =item B<SEQUENCE>, B<SEQ>, B<SET>
  74. Formats the result as an ASN1 B<SEQUENCE> or B<SET> type. I<value>
  75. should be a section name which will contain the contents. The
  76. field names in the section are ignored and the values are in the
  77. generated string format. If I<value> is absent then an empty SEQUENCE
  78. will be encoded.
  79. =back
  80. =head2 Modifiers
  81. Modifiers affect the following structure, they can be used to
  82. add EXPLICIT or IMPLICIT tagging, add wrappers or to change
  83. the string format of the final type and value. The supported
  84. formats are documented below.
  85. =over 4
  86. =item B<EXPLICIT>, B<EXP>
  87. Add an explicit tag to the following structure. This string
  88. should be followed by a colon and the tag value to use as a
  89. decimal value.
  90. By following the number with B<U>, B<A>, B<P> or B<C> UNIVERSAL,
  91. APPLICATION, PRIVATE or CONTEXT SPECIFIC tagging can be used,
  92. the default is CONTEXT SPECIFIC.
  93. =item B<IMPLICIT>, B<IMP>
  94. This is the same as B<EXPLICIT> except IMPLICIT tagging is used
  95. instead.
  96. =item B<OCTWRAP>, B<SEQWRAP>, B<SETWRAP>, B<BITWRAP>
  97. The following structure is surrounded by an OCTET STRING, a SEQUENCE,
  98. a SET or a BIT STRING respectively. For a BIT STRING the number of unused
  99. bits is set to zero.
  100. =item B<FORMAT>
  101. This specifies the format of the ultimate value. It should be followed
  102. by a colon and one of the strings B<ASCII>, B<UTF8>, B<HEX> or B<BITLIST>.
  103. If no format specifier is included then B<ASCII> is used. If B<UTF8> is
  104. specified then the value string must be a valid B<UTF8> string. For B<HEX> the
  105. output must be a set of hex digits. B<BITLIST> (which is only valid for a BIT
  106. STRING) is a comma separated list of the indices of the set bits, all other
  107. bits are zero.
  108. =back
  109. =head1 RETURN VALUES
  110. ASN1_generate_nconf() and ASN1_generate_v3() return the encoded
  111. data as an B<ASN1_TYPE> structure or NULL if an error occurred.
  112. The error codes that can be obtained by L<ERR_get_error(3)>.
  113. =head1 EXAMPLES
  114. A simple IA5String:
  115. IA5STRING:Hello World
  116. An IA5String explicitly tagged:
  117. EXPLICIT:0,IA5STRING:Hello World
  118. An IA5String explicitly tagged using APPLICATION tagging:
  119. EXPLICIT:0A,IA5STRING:Hello World
  120. A BITSTRING with bits 1 and 5 set and all others zero:
  121. FORMAT:BITLIST,BITSTRING:1,5
  122. A more complex example using a config file to produce a
  123. SEQUENCE consisting of a BOOL an OID and a UTF8String:
  124. asn1 = SEQUENCE:seq_section
  125. [seq_section]
  126. field1 = BOOLEAN:TRUE
  127. field2 = OID:commonName
  128. field3 = UTF8:Third field
  129. This example produces an RSAPrivateKey structure, this is the
  130. key contained in the file client.pem in all OpenSSL distributions
  131. (note: the field names such as 'coeff' are ignored and are present just
  132. for clarity):
  133. asn1=SEQUENCE:private_key
  134. [private_key]
  135. version=INTEGER:0
  136. n=INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AFFB93644\
  137. D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
  138. e=INTEGER:0x010001
  139. d=INTEGER:0x6F05EAD2F27FFAEC84BEC360C4B928FD5F3A9865D0FCAAD291E2A52F4A\
  140. F810DC6373278C006A0ABBA27DC8C63BF97F7E666E27C5284D7D3B1FFFE16B7A87B51D
  141. p=INTEGER:0xF3929B9435608F8A22C208D86795271D54EBDFB09DDEF539AB083DA912\
  142. D4BD57
  143. q=INTEGER:0xC50016F89DFF2561347ED1186A46E150E28BF2D0F539A1594BBD7FE467\
  144. 46EC4F
  145. exp1=INTEGER:0x9E7D4326C924AFC1DEA40B45650134966D6F9DFA3A7F9D698CD4ABEA\
  146. 9C0A39B9
  147. exp2=INTEGER:0xBA84003BB95355AFB7C50DF140C60513D0BA51D637272E355E397779\
  148. E7B2458F
  149. coeff=INTEGER:0x30B9E4F2AFA5AC679F920FC83F1F2DF1BAF1779CF989447FABC2F5\
  150. 628657053A
  151. This example is the corresponding public key in a SubjectPublicKeyInfo
  152. structure:
  153. # Start with a SEQUENCE
  154. asn1=SEQUENCE:pubkeyinfo
  155. # pubkeyinfo contains an algorithm identifier and the public key wrapped
  156. # in a BIT STRING
  157. [pubkeyinfo]
  158. algorithm=SEQUENCE:rsa_alg
  159. pubkey=BITWRAP,SEQUENCE:rsapubkey
  160. # algorithm ID for RSA is just an OID and a NULL
  161. [rsa_alg]
  162. algorithm=OID:rsaEncryption
  163. parameter=NULL
  164. # Actual public key: modulus and exponent
  165. [rsapubkey]
  166. n=INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AFFB93644\
  167. D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
  168. e=INTEGER:0x010001
  169. =head1 SEE ALSO
  170. L<ERR_get_error(3)>
  171. =head1 COPYRIGHT
  172. Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
  173. Licensed under the Apache License 2.0 (the "License"). You may not use
  174. this file except in compliance with the License. You can obtain a copy
  175. in the file LICENSE in the source distribution or at
  176. L<https://www.openssl.org/source/license.html>.
  177. =cut