214 lines
7.2 KiB
Plaintext
214 lines
7.2 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "SMIME_WRITE_ASN1 3ossl"
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.TH SMIME_WRITE_ASN1 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SMIME_write_ASN1_ex, SMIME_write_ASN1
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\&\- convert structure to S/MIME format
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/asn1.h>
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\&
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\& int SMIME_write_ASN1_ex(BIO *out, ASN1_VALUE *val, BIO *data, int flags,
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\& int ctype_nid, int econt_nid,
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\& STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it,
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\& OSSL_LIB_CTX *libctx, const char *propq);
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\&
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\& int SMIME_write_ASN1(BIO *out,
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\& ASN1_VALUE *val, BIO *data, int flags, int ctype_nid, int econt_nid,
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\& STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISMIME_write_ASN1_ex()\fR adds the appropriate \s-1MIME\s0 headers to an object
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structure to produce an S/MIME message.
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.PP
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\&\fIout\fR is the \s-1BIO\s0 to write the data to. \fIvalue\fR is the appropriate \s-1ASN1_VALUE\s0
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structure (either CMS_ContentInfo or \s-1PKCS7\s0). If streaming is enabled then the
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content must be supplied via \fIdata\fR.
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\&\fIflags\fR is an optional set of flags. \fIctype_nid\fR is the \s-1NID\s0 of the content
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type, \fIecont_nid\fR is the \s-1NID\s0 of the embedded content type and \fImdalgs\fR is a
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list of signed data digestAlgorithms. Valid values that can be used by the
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\&\s-1ASN.1\s0 structure \fIit\fR are ASN1_ITEM_rptr(\s-1PKCS7\s0) or ASN1_ITEM_rptr(CMS_ContentInfo).
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The library context \fIlibctx\fR and the property query \fIpropq\fR are used when
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retrieving algorithms from providers.
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.SH "NOTES"
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.IX Header "NOTES"
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The higher level functions \fISMIME_write_CMS\fR\|(3) and
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\&\fISMIME_write_PKCS7\fR\|(3) should be used instead of \fISMIME_write_ASN1()\fR.
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.PP
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The following flags can be passed in the \fBflags\fR parameter.
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.PP
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If \fB\s-1CMS_DETACHED\s0\fR is set then cleartext signing will be used, this option only
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makes sense for SignedData where \fB\s-1CMS_DETACHED\s0\fR is also set when the \fIsign()\fR
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method is called.
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.PP
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If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are added to
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the content, this only makes sense if \fB\s-1CMS_DETACHED\s0\fR is also set.
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.PP
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If the \fB\s-1CMS_STREAM\s0\fR flag is set streaming is performed. This flag should only
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be set if \fB\s-1CMS_STREAM\s0\fR was also set in the previous call to a CMS_ContentInfo
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or \s-1PKCS7\s0 creation function.
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.PP
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If cleartext signing is being used and \fB\s-1CMS_STREAM\s0\fR not set then the data must
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be read twice: once to compute the signature in sign method and once to output
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the S/MIME message.
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.PP
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If streaming is performed the content is output in \s-1BER\s0 format using indefinite
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length constructed encoding except in the case of signed data with detached
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content where the content is absent and \s-1DER\s0 format is used.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISMIME_write_ASN1_ex()\fR and \fISMIME_write_ASN1()\fR return 1 for success or
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0 for failure.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3),
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\&\fISMIME_write_CMS\fR\|(3),
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\&\fISMIME_write_PKCS7\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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