5 ASN1_generate_nconf, ASN1_generate_v3 - ASN1 generation functions
9 ASN1_TYPE *ASN1_generate_nconf(char *str, CONF *nconf);
10 ASN1_TYPE *ASN1_generate_v3(char *str, X509V3_CTX *cnf);
14 These functions generate the ASN1 encoding of a string
15 in an B<ASN1_TYPE> structure.
17 B<str> contains the string to encode B<nconf> or B<cnf> contains
18 the optional configuration information where additional strings
19 will be read from. B<nconf> will typically come from a config
20 file wherease B<cnf> is obtained from an B<X509V3_CTX> structure
21 which will typically be used by X509 v3 certificate extension
22 functions. B<cnf> or B<nconf> can be set to B<NULL> if no additional
23 configuration will be used.
25 =head1 GENERATION STRING FORMAT
27 The actual data encoded is determined by the string B<str> and
28 the configuration information. The general format of the string
31 B<[modifier,]type[:value]>
33 That is zero or more comma separated modifiers followed by a type
34 followed by an optional colon and a value. The formats of B<type>,
35 B<value> and B<modifier> is explained below.
37 =head2 SUPPORTED TYPES
39 The supported types are listed below. Unless otherwise specified
40 only the B<ASCII> format is permissible.
44 =item B<BOOLEAN>, B<BOOL>
46 This encodes a boolean type. The B<value> string is mandatory and
47 should be B<TRUE> or B<FALSE>. Additionally B<TRUE>, B<true>, B<Y>,
48 B<y>, B<YES>, B<yes>, B<FALSE> B<false>, B<N>, B<n>, B<NO> and B<no>
53 Encode the B<NULL> type, the B<value> string must not be present.
55 =item B<INTEGER>, B<INT>
57 Encodes an ASN1 B<INTEGER> type. The B<value> string represents
58 the value of the integer, it can be preceeded by a minus sign and
59 is normally interpreted as a decimal value unless the prefix B<0x>
62 =item B<ENUMERATED>, B<ENUM>
64 Encodes the ASN1 B<ENUMERATED> type, it is otherwise identical to
67 =item B<OBJECT>, B<OID>
69 Encodes an ASN1 B<OBJECT IDENTIFIER>, the B<value> string can be
70 a short name, a long name or numerical format.
72 =item B<UTCTIME>, B<UTC>
74 Encodes an ASN1 B<UTCTime> structure, the value should be in
75 the format B<YYMMDDHHMMSSZ>.
77 =item B<GENERALIZEDTIME>, B<GENTIME>
79 Encodes an ASN1 B<GeneralizedTime> structure, the value should be in
80 the format B<YYYYMMDDHHMMSSZ>.
82 =item B<OCTETSTRING>, B<OCT>
84 Emcodes an ASN1 B<OCTET STRING>. B<value> represents the contents
85 of this structure, the format strings B<ASCII> and B<HEX> can be
86 used to specify the format of B<value>.
88 =item B<BITSRING>, B<BITSTR>
90 Emcodes an ASN1 B<BIT STRING>. B<value> represents the contents
91 of this structure, the format strings B<ASCII>, B<HEX> and B<BITLIST>
92 can be used to specify the format of B<value>.
94 If the format is anything other than B<BITLIST> the number of unused
97 =item B<UNIVERSALSTRING>, B<UNIV>, B<IA5>, B<IA5STRING>, B<UTF8>,
98 B<UTF8String>, B<BMP>, B<BMPSTRING>, B<VISIBLESTRING>,
99 B<VISIBLE>, B<PRINTABLESTRING>, B<PRINTABLE>, B<T61>,
100 B<T61STRING>, B<TELETEXSTRING>
102 These encode the corresponding string types. B<value> represents the
103 contents of this structure. The format can be B<ASCII> or B<UTF8>.
105 =item B<SEQUENCE>, B<SEQ>, B<SET>
107 Formats the result as an ASN1 B<SEQUENCE> or B<SET> type. B<value>
108 should be a section name which will contain the contents. The
109 field names are ignored and the values are in the generated
110 string format. If B<value> is absent the the content will be empty.
116 Modifiers affect the following structure, they can be used to
117 add EXPLICIT or IMPLICIT tagging, add wrappers or to change
118 the string format of the final type and value. The supported
119 formats are documented below.
123 =item B<EXPLICIT>, B<EXP>
125 Add an explicit tag to the following structure. This string
126 should be followed by a colon and the tag value to use as a
129 By following the number with B<U>, B<A>, B<P> or B<C> UNIVERSAL,
130 APPLICATION, PRIVATE or CONTEXT SPECIFIC tagging can be used,
131 the default is CONTEXT SPECIFIC.
133 =item B<IMPLICIT>, B<IMP>
135 This is the same as B<EXPLICIT> except IMPLICIT tagging is used
138 =item B<OCTWRAP>, B<SEQWRAP>, B<BITWRAP>
140 The following structure is surrounded by an OCTET STRING, a SEQUENCE
141 or a BIT STRING respectively. For a BIT STRING the number of unused
146 This specifies the format of the ultimate value. It should be followed
147 by a colon and one of the strings B<ASCII>, B<UTF8>, B<HEX> or B<BITLIST>.
149 If no format specifier is included then B<ASCII> is used. If B<UTF8> is specified
150 then the value string must be a valid B<UTF8> string. For B<HEX> the output must
151 be a set of hex digits. B<BITLIST> (which is only valid for a BIT STRING) is a
152 comma separated list of set bits.
160 IA5STRING:Hello World
162 An IA5String explicitly tagged:
164 EXPLICIT:0,IA5STRING:Hello World
166 An IA5String explicitly tagged using APPLICATION tagging:
168 EXPLICIT:0A,IA5STRING:Hello World
170 A more complex example using a config file to produce a
171 SEQUENCE consiting of a BOOL an OID and a UTF8String:
173 asn1 = SEQUENCE:seq_section
177 field1 = BOOLEAN:TRUE
178 field2 = OID:commonName
179 field3 = UTF8:Third field
181 This example produces an RSAPrivateKey structure, this is the
182 key contained in the file client.pem in all OpenSSL distributions
183 (note: the field names such as 'coeff' are ignored and are present just
186 asn1=SEQUENCE:private_key
190 n=INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AFFB93644\
191 D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
195 d=INTEGER:0x6F05EAD2F27FFAEC84BEC360C4B928FD5F3A9865D0FCAAD291E2A52F4A\
196 F810DC6373278C006A0ABBA27DC8C63BF97F7E666E27C5284D7D3B1FFFE16B7A87B51D
198 p=INTEGER:0xF3929B9435608F8A22C208D86795271D54EBDFB09DDEF539AB083DA912\
201 q=INTEGER:0xC50016F89DFF2561347ED1186A46E150E28BF2D0F539A1594BBD7FE467\
204 exp1=INTEGER:0x9E7D4326C924AFC1DEA40B45650134966D6F9DFA3A7F9D698CD4ABEA\
207 exp2=INTEGER:0xBA84003BB95355AFB7C50DF140C60513D0BA51D637272E355E397779\
210 coeff=INTEGER:0x30B9E4F2AFA5AC679F920FC83F1F2DF1BAF1779CF989447FABC2F5\
213 This example is the corresponding public key in a SubjectPublicKeyInfo
216 # Start with a SEQUENCE
217 asn1=SEQUENCE:pubkeyinfo
219 # pubkeyinfo contains an algorithm identifier and the public key wrapped
222 algorithm=SEQUENCE:rsa_alg
223 pubkey=BITWRAP,SEQUENCE:rsapubkey
225 # algorithm ID for RSA is just an OID and a NULL
227 algorithm=OID:rsaEncryption
230 # Actual public key: modulus and exponent
232 n=INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AFFB93644\
233 D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
239 ASN1_generate_nconf() and ASN1_generate_v3() return the encoded
240 data as an B<ASN1_TYPE> structure or B<NULL> if an error occurred.
242 The error codes that can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
246 L<ERR_get_error(3)|ERR_get_error(3)>
250 ASN1_generate_nconf() and ASN1_generate_v3() were added to OpenSSL 0.9.8