388 lines
13 KiB
Groff
388 lines
13 KiB
Groff
.\" $NetBSD: ASN1_generate_nconf.3,v 1.5 2007/11/27 22:19:12 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "ASN1_generate_nconf 3"
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.TH ASN1_generate_nconf 3 "2005-11-24" "0.9.8e" "OpenSSL"
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.SH "NAME"
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ASN1_generate_nconf, ASN1_generate_v3 \- ASN1 generation functions
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& ASN1_TYPE *ASN1_generate_nconf(char *str, CONF *nconf);
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\& ASN1_TYPE *ASN1_generate_v3(char *str, X509V3_CTX *cnf);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions generate the \s-1ASN1\s0 encoding of a string
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in an \fB\s-1ASN1_TYPE\s0\fR structure.
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.PP
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\&\fBstr\fR contains the string to encode \fBnconf\fR or \fBcnf\fR contains
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the optional configuration information where additional strings
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will be read from. \fBnconf\fR will typically come from a config
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file wherease \fBcnf\fR is obtained from an \fBX509V3_CTX\fR structure
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which will typically be used by X509 v3 certificate extension
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functions. \fBcnf\fR or \fBnconf\fR can be set to \fB\s-1NULL\s0\fR if no additional
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configuration will be used.
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.SH "GENERATION STRING FORMAT"
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.IX Header "GENERATION STRING FORMAT"
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The actual data encoded is determined by the string \fBstr\fR and
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the configuration information. The general format of the string
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is:
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.PP
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.Vb 1
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\& B<[modifier,]type[:value]>
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.Ve
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.PP
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That is zero or more comma separated modifiers followed by a type
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followed by an optional colon and a value. The formats of \fBtype\fR,
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\&\fBvalue\fR and \fBmodifier\fR are explained below.
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.Sh "\s-1SUPPORTED\s0 \s-1TYPES\s0"
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.IX Subsection "SUPPORTED TYPES"
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The supported types are listed below. Unless otherwise specified
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only the \fB\s-1ASCII\s0\fR format is permissible.
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.IP "\fB\s-1BOOLEAN\s0\fR, \fB\s-1BOOL\s0\fR" 2
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.IX Item "BOOLEAN, BOOL"
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This encodes a boolean type. The \fBvalue\fR string is mandatory and
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should be \fB\s-1TRUE\s0\fR or \fB\s-1FALSE\s0\fR. Additionally \fB\s-1TRUE\s0\fR, \fBtrue\fR, \fBY\fR,
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\&\fBy\fR, \fB\s-1YES\s0\fR, \fByes\fR, \fB\s-1FALSE\s0\fR, \fBfalse\fR, \fBN\fR, \fBn\fR, \fB\s-1NO\s0\fR and \fBno\fR
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are acceptable.
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.IP "\fB\s-1NULL\s0\fR" 2
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.IX Item "NULL"
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Encode the \fB\s-1NULL\s0\fR type, the \fBvalue\fR string must not be present.
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.IP "\fB\s-1INTEGER\s0\fR, \fB\s-1INT\s0\fR" 2
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.IX Item "INTEGER, INT"
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Encodes an \s-1ASN1\s0 \fB\s-1INTEGER\s0\fR type. The \fBvalue\fR string represents
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the value of the integer, it can be preceeded by a minus sign and
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is normally interpreted as a decimal value unless the prefix \fB0x\fR
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is included.
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.IP "\fB\s-1ENUMERATED\s0\fR, \fB\s-1ENUM\s0\fR" 2
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.IX Item "ENUMERATED, ENUM"
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Encodes the \s-1ASN1\s0 \fB\s-1ENUMERATED\s0\fR type, it is otherwise identical to
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\&\fB\s-1INTEGER\s0\fR.
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.IP "\fB\s-1OBJECT\s0\fR, \fB\s-1OID\s0\fR" 2
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.IX Item "OBJECT, OID"
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Encodes an \s-1ASN1\s0 \fB\s-1OBJECT\s0 \s-1IDENTIFIER\s0\fR, the \fBvalue\fR string can be
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a short name, a long name or numerical format.
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.IP "\fB\s-1UTCTIME\s0\fR, \fB\s-1UTC\s0\fR" 2
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.IX Item "UTCTIME, UTC"
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Encodes an \s-1ASN1\s0 \fBUTCTime\fR structure, the value should be in
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the format \fB\s-1YYMMDDHHMMSSZ\s0\fR.
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.IP "\fB\s-1GENERALIZEDTIME\s0\fR, \fB\s-1GENTIME\s0\fR" 2
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.IX Item "GENERALIZEDTIME, GENTIME"
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Encodes an \s-1ASN1\s0 \fBGeneralizedTime\fR structure, the value should be in
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the format \fB\s-1YYYYMMDDHHMMSSZ\s0\fR.
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.IP "\fB\s-1OCTETSTRING\s0\fR, \fB\s-1OCT\s0\fR" 2
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.IX Item "OCTETSTRING, OCT"
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Emcodes an \s-1ASN1\s0 \fB\s-1OCTET\s0 \s-1STRING\s0\fR. \fBvalue\fR represents the contents
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of this structure, the format strings \fB\s-1ASCII\s0\fR and \fB\s-1HEX\s0\fR can be
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used to specify the format of \fBvalue\fR.
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.IP "\fB\s-1BITSRING\s0\fR, \fB\s-1BITSTR\s0\fR" 2
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.IX Item "BITSRING, BITSTR"
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Emcodes an \s-1ASN1\s0 \fB\s-1BIT\s0 \s-1STRING\s0\fR. \fBvalue\fR represents the contents
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of this structure, the format strings \fB\s-1ASCII\s0\fR, \fB\s-1HEX\s0\fR and \fB\s-1BITLIST\s0\fR
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can be used to specify the format of \fBvalue\fR.
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.Sp
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If the format is anything other than \fB\s-1BITLIST\s0\fR the number of unused
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bits is set to zero.
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.IP "\fB\s-1UNIVERSALSTRING\s0\fR, \fB\s-1UNIV\s0\fR, \fB\s-1IA5\s0\fR, \fB\s-1IA5STRING\s0\fR, \fB\s-1UTF8\s0\fR, \fBUTF8String\fR, \fB\s-1BMP\s0\fR, \fB\s-1BMPSTRING\s0\fR, \fB\s-1VISIBLESTRING\s0\fR, \fB\s-1VISIBLE\s0\fR, \fB\s-1PRINTABLESTRING\s0\fR, \fB\s-1PRINTABLE\s0\fR, \fBT61\fR, \fBT61STRING\fR, \fB\s-1TELETEXSTRING\s0\fR, \fBGeneralString\fR" 2
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.IX Item "UNIVERSALSTRING, UNIV, IA5, IA5STRING, UTF8, UTF8String, BMP, BMPSTRING, VISIBLESTRING, VISIBLE, PRINTABLESTRING, PRINTABLE, T61, T61STRING, TELETEXSTRING, GeneralString"
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These encode the corresponding string types. \fBvalue\fR represents the
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contents of this structure. The format can be \fB\s-1ASCII\s0\fR or \fB\s-1UTF8\s0\fR.
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.IP "\fB\s-1SEQUENCE\s0\fR, \fB\s-1SEQ\s0\fR, \fB\s-1SET\s0\fR" 2
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.IX Item "SEQUENCE, SEQ, SET"
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Formats the result as an \s-1ASN1\s0 \fB\s-1SEQUENCE\s0\fR or \fB\s-1SET\s0\fR type. \fBvalue\fR
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should be a section name which will contain the contents. The
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field names in the section are ignored and the values are in the
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generated string format. If \fBvalue\fR is absent then an empty \s-1SEQUENCE\s0
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will be encoded.
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.Sh "\s-1MODIFIERS\s0"
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.IX Subsection "MODIFIERS"
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Modifiers affect the following structure, they can be used to
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add \s-1EXPLICIT\s0 or \s-1IMPLICIT\s0 tagging, add wrappers or to change
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the string format of the final type and value. The supported
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formats are documented below.
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.IP "\fB\s-1EXPLICIT\s0\fR, \fB\s-1EXP\s0\fR" 2
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.IX Item "EXPLICIT, EXP"
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Add an explicit tag to the following structure. This string
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should be followed by a colon and the tag value to use as a
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decimal value.
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.Sp
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By following the number with \fBU\fR, \fBA\fR, \fBP\fR or \fBC\fR \s-1UNIVERSAL\s0,
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\&\s-1APPLICATION\s0, \s-1PRIVATE\s0 or \s-1CONTEXT\s0 \s-1SPECIFIC\s0 tagging can be used,
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the default is \s-1CONTEXT\s0 \s-1SPECIFIC\s0.
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.IP "\fB\s-1IMPLICIT\s0\fR, \fB\s-1IMP\s0\fR" 2
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.IX Item "IMPLICIT, IMP"
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This is the same as \fB\s-1EXPLICIT\s0\fR except \s-1IMPLICIT\s0 tagging is used
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instead.
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.IP "\fB\s-1OCTWRAP\s0\fR, \fB\s-1SEQWRAP\s0\fR, \fB\s-1SETWRAP\s0\fR, \fB\s-1BITWRAP\s0\fR" 2
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.IX Item "OCTWRAP, SEQWRAP, SETWRAP, BITWRAP"
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The following structure is surrounded by an \s-1OCTET\s0 \s-1STRING\s0, a \s-1SEQUENCE\s0,
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a \s-1SET\s0 or a \s-1BIT\s0 \s-1STRING\s0 respectively. For a \s-1BIT\s0 \s-1STRING\s0 the number of unused
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bits is set to zero.
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.IP "\fB\s-1FORMAT\s0\fR" 2
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.IX Item "FORMAT"
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This specifies the format of the ultimate value. It should be followed
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by a colon and one of the strings \fB\s-1ASCII\s0\fR, \fB\s-1UTF8\s0\fR, \fB\s-1HEX\s0\fR or \fB\s-1BITLIST\s0\fR.
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.Sp
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If no format specifier is included then \fB\s-1ASCII\s0\fR is used. If \fB\s-1UTF8\s0\fR is specified
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then the value string must be a valid \fB\s-1UTF8\s0\fR string. For \fB\s-1HEX\s0\fR the output must
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be a set of hex digits. \fB\s-1BITLIST\s0\fR (which is only valid for a \s-1BIT\s0 \s-1STRING\s0) is a
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comma separated list of set bits.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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A simple IA5String:
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.PP
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.Vb 1
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\& IA5STRING:Hello World
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.Ve
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.PP
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An IA5String explicitly tagged:
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.PP
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.Vb 1
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\& EXPLICIT:0,IA5STRING:Hello World
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.Ve
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.PP
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An IA5String explicitly tagged using \s-1APPLICATION\s0 tagging:
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.PP
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.Vb 1
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\& EXPLICIT:0A,IA5STRING:Hello World
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.Ve
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.PP
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A more complex example using a config file to produce a
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\&\s-1SEQUENCE\s0 consiting of a \s-1BOOL\s0 an \s-1OID\s0 and a UTF8String:
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.PP
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asn1 = SEQUENCE:seq_section
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.PP
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[seq_section]
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.PP
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field1 = \s-1BOOLEAN:TRUE\s0
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field2 = OID:commonName
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field3 = UTF8:Third field
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.PP
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This example produces an RSAPrivateKey structure, this is the
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key contained in the file client.pem in all OpenSSL distributions
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(note: the field names such as 'coeff' are ignored and are present just
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for clarity):
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.PP
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.Vb 3
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\& asn1=SEQUENCE:private_key
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\& [private_key]
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\& version=INTEGER:0
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.Ve
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.PP
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.Vb 2
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\& n=INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AFFB93644\e
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\& D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
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.Ve
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.PP
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.Vb 1
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\& e=INTEGER:0x010001
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.Ve
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.PP
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.Vb 2
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\& d=INTEGER:0x6F05EAD2F27FFAEC84BEC360C4B928FD5F3A9865D0FCAAD291E2A52F4A\e
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\& F810DC6373278C006A0ABBA27DC8C63BF97F7E666E27C5284D7D3B1FFFE16B7A87B51D
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.Ve
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.PP
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.Vb 2
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\& p=INTEGER:0xF3929B9435608F8A22C208D86795271D54EBDFB09DDEF539AB083DA912\e
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\& D4BD57
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.Ve
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.PP
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.Vb 2
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\& q=INTEGER:0xC50016F89DFF2561347ED1186A46E150E28BF2D0F539A1594BBD7FE467\e
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\& 46EC4F
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.Ve
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.PP
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.Vb 2
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\& exp1=INTEGER:0x9E7D4326C924AFC1DEA40B45650134966D6F9DFA3A7F9D698CD4ABEA\e
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\& 9C0A39B9
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.Ve
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.PP
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.Vb 2
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\& exp2=INTEGER:0xBA84003BB95355AFB7C50DF140C60513D0BA51D637272E355E397779\e
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\& E7B2458F
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.Ve
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.PP
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.Vb 2
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\& coeff=INTEGER:0x30B9E4F2AFA5AC679F920FC83F1F2DF1BAF1779CF989447FABC2F5\e
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\& 628657053A
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.Ve
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.PP
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This example is the corresponding public key in a SubjectPublicKeyInfo
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structure:
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.PP
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.Vb 2
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\& # Start with a SEQUENCE
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\& asn1=SEQUENCE:pubkeyinfo
|
|
.Ve
|
|
.PP
|
|
.Vb 5
|
|
\& # pubkeyinfo contains an algorithm identifier and the public key wrapped
|
|
\& # in a BIT STRING
|
|
\& [pubkeyinfo]
|
|
\& algorithm=SEQUENCE:rsa_alg
|
|
\& pubkey=BITWRAP,SEQUENCE:rsapubkey
|
|
.Ve
|
|
.PP
|
|
.Vb 4
|
|
\& # algorithm ID for RSA is just an OID and a NULL
|
|
\& [rsa_alg]
|
|
\& algorithm=OID:rsaEncryption
|
|
\& parameter=NULL
|
|
.Ve
|
|
.PP
|
|
.Vb 4
|
|
\& # Actual public key: modulus and exponent
|
|
\& [rsapubkey]
|
|
\& n=INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AFFB93644\e
|
|
\& D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& e=INTEGER:0x010001
|
|
.Ve
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIASN1_generate_nconf()\fR and \fIASN1_generate_v3()\fR return the encoded
|
|
data as an \fB\s-1ASN1_TYPE\s0\fR structure or \fB\s-1NULL\s0\fR if an error occurred.
|
|
.PP
|
|
The error codes that can be obtained by \fIERR_get_error\fR\|(3).
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIERR_get_error\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
\&\fIASN1_generate_nconf()\fR and \fIASN1_generate_v3()\fR were added to OpenSSL 0.9.8
|